carrierscore

Look up an FMCSA-registered motor carrier's identity by US DOT number: legal name, DBA, operating status, FMCSA safety rating, fleet size (power units, drivers), physical address, and registration dates. Use this first when a booking/dispatch agent needs to confirm WHO a carrier is — that a DOT number is real, active, and matches the company name on a rate confirmation. It does not return risk indices (use carrier_score for those). Returns JSON: { dot_number, legal_name, dba_name, status_code, safety_rating, power_units, total_drivers, phy_street, phy_city, phy_state, phy_zip, add_date, mcs150_date }. Errors: 404 if the DOT is not in the FMCSA census (likely a typo or a fraudulent/never-registered carrier — treat as a red flag for booking).

{
  "type": "object",
  "properties": {
    "dot_number": {
      "type": "string",
      "pattern": "^\\d{1,8}$",
      "description": "US DOT number of the carrier, digits only (e.g. \"1234567\")"
    }
  },
  "required": [
    "dot_number"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

{
  "type": "object",
  "properties": {
    "dot_number": {
      "type": "string",
      "description": "US DOT number"
    },
    "legal_name": {
      "type": [
        "string",
        "null"
      ],
      "description": "Registered legal name"
    },
    "dba_name": {
      "$ref": "#/properties/legal_name",
      "description": "Doing-business-as name, if any"
    },
    "status_code": {
      "$ref": "#/properties/legal_name",
      "description": "FMCSA operating status code (e.g. \"A\" = active)"
    },
    "safety_rating": {
      "$ref": "#/properties/legal_name",
      "description": "FMCSA safety rating code (e.g. \"S\" = satisfactory)"
    },
    "power_units": {
      "type": [
        "number",
        "null"
      ],
      "description": "Fleet size: number of power units"
    },
    "total_drivers": {
      "$ref": "#/properties/power_units",
      "description": "Total drivers reported"
    },
    "phy_street": {
      "$ref": "#/properties/legal_name"
    },
    "phy_city": {
      "$ref": "#/properties/phy_street"
    },
    "phy_state": {
      "$ref": "#/properties/phy_street"
    },
    "phy_zip": {
      "$ref": "#/properties/phy_street"
    },
    "add_date": {
      "$ref": "#/properties/legal_name",
      "description": "Date added to the FMCSA census (YYYY-MM-DD)"
    },
    "mcs150_date": {
      "$ref": "#/properties/legal_name",
      "description": "Latest MCS-150 filing date (YYYY-MM-DD)"
    }
  },
  "required": [
    "dot_number"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Get the CarrierScore risk indices for a carrier by US DOT number: two first-class, separately validated indices (0-100, HIGHER = RISKIER), each with a full component breakdown. This is the core "is this carrier safe to book?" signal for AI booking agents. Served methodology v0.5 returns TWO indices, both population-relative and built from point-in-time public FMCSA data: - inspection_risk — inspection / compliance risk: violations and out-of-service rates per roadside inspection (24-month chronic, 6-month acute). Historically validated against the carrier's future out-of-service rate (validation block on the index). - crash_risk — crash risk: reportable crashes, fatal/injury crashes and tow-away crashes per roadside inspection (24 months). Historically validated against future reportable crashes (validation block on the index). Present BOTH indices; do not collapse them into one number. Hard flags (active out-of-service order, no active insurance filing, high-confidence reincarnated-carrier link) add explicit surcharges — a carrier with any flag deserves extra scrutiny regardless of index values. Returns JSON: { dot_number, legal_name, inspection_risk: { label, description, score, base, surcharge, percentile_basis, band, band_note, data_sufficiency, components: { <name>: { label, value, percentile, weight } }, validation: { auc_holdout, label, holdout_origins, post_selection_origin, source, text } }, crash_risk: { ...same shape... }, legacy_composite: { score, base_score, surcharge, rule, rule_text, validated: false, note }, carrier_score (backward-compatible: == legacy_composite.score under v0.5), base_score, surcharge, score_version ("0.5"), methodology_note, components (flat, backward-compatible), flags: string[], data_sufficiency (0-1, share of the components resting on observed vs neutral-imputed data), scored_as_of, disclaimer }. Older opt-in methodologies keep their shapes: v0 (six components), v0.3 (sub_indices), v0.4 (indices + composite). Interpreting for booking decisions: treat the indices as documented decision-support evidence, not an approve/deny verdict. legacy_composite / carrier_score is NOT validated and is kept only so older integrations keep working — never present it as the carrier's risk score. Low data_sufficiency means limited inspection history — common for new carriers, itself a risk signal. Always relay each index's validation text and the disclaimer when presenting the result. Errors: 404 if the DOT is not in the scored population; 503 if scores have not been computed yet.

{
  "type": "object",
  "properties": {
    "dot_number": {
      "type": "string",
      "pattern": "^\\d{1,8}$",
      "description": "US DOT number of the carrier, digits only (e.g. \"1234567\")"
    }
  },
  "required": [
    "dot_number"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

{
  "type": "object",
  "properties": {
    "dot_number": {
      "type": "string",
      "description": "US DOT number"
    },
    "legal_name": {
      "type": [
        "string",
        "null"
      ]
    },
    "inspection_risk": {
      "type": "object",
      "properties": {
        "label": {
          "type": "string"
        },
        "description": {
          "type": "string"
        },
        "score": {
          "type": [
            "number",
            "null"
          ],
          "description": "Index 0-100 incl. its own surcharge, higher = riskier"
        },
        "base": {
          "type": [
            "number",
            "null"
          ],
          "description": "Percentile blend before surcharge (0-100)"
        },
        "surcharge": {
          "type": [
            "number",
            "null"
          ]
        },
        "surcharges_applied": {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "percentile_basis": {
          "type": "string",
          "description": "\"global\" or \"banded\" (24m inspection-activity band)"
        },
        "band": {
          "type": [
            "string",
            "null"
          ],
          "description": "Carrier's 24m inspection-count band"
        },
        "band_note": {
          "type": "string"
        },
        "data_sufficiency": {
          "type": [
            "number",
            "null"
          ]
        },
        "components": {
          "type": "object",
          "additionalProperties": {
            "type": "object",
            "properties": {
              "label": {
                "type": "string",
                "description": "Human-readable component label"
              },
              "value": {
                "type": [
                  "number",
                  "null"
                ],
                "description": "Raw component value"
              },
              "percentile": {
                "type": [
                  "number",
                  "null"
                ],
                "description": "Population percentile of the value, 0-1"
              },
              "weight": {
                "type": "number",
                "description": "Component weight in the base score"
              }
            },
            "required": [
              "label"
            ],
            "additionalProperties": true
          }
        },
        "validation": {
          "type": "object",
          "properties": {
            "auc_holdout": {
              "type": "string",
              "description": "Held-out AUC range on the index's own outcome"
            },
            "auc_post_selection_holdout": {
              "type": "string"
            },
            "top_decile_lift": {
              "type": "string"
            },
            "label": {
              "type": "string",
              "description": "The future outcome the index was validated against"
            },
            "holdout_origins": {
              "type": "array",
              "items": {
                "type": "string"
              }
            },
            "post_selection_origin": {
              "type": [
                "string",
                "null"
              ]
            },
            "source": {
              "type": "string",
              "description": "Path of the validation report in docs/research"
            },
            "text": {
              "type": "string",
              "description": "One-line validation statement — relay with the index"
            }
          },
          "additionalProperties": true,
          "description": "v0.5: this index's own historical validation (point-in-time backtest, held-out cohorts)"
        }
      },
      "additionalProperties": true,
      "description": "v0.5 (served default): INSPECTION / COMPLIANCE RISK index 0-100 (higher = riskier) — violations and out-of-service rates per roadside inspection relative to the population; validated against future out-of-service rate. Read this first."
    },
    "crash_risk": {
      "$ref": "#/properties/inspection_risk",
      "description": "v0.5 (served default): CRASH RISK index 0-100 (higher = riskier) — crashes, fatal/injury and tow-away crashes per roadside inspection relative to the population; validated against future reportable crashes. Read this second."
    },
    "legacy_composite": {
      "type": "object",
      "properties": {
        "score": {
          "type": [
            "number",
            "null"
          ],
          "description": "Legacy composite 0-100 (== top-level carrier_score)"
        },
        "base_score": {
          "type": [
            "number",
            "null"
          ]
        },
        "surcharge": {
          "type": [
            "number",
            "null"
          ]
        },
        "rule": {
          "type": "string"
        },
        "rule_text": {
          "type": "string"
        },
        "validated": {
          "type": "boolean",
          "description": "Always false: the composite is not validated or gated"
        },
        "note": {
          "type": "string"
        }
      },
      "additionalProperties": true,
      "description": "v0.5: backward-compatible legacy composite (0.70 x higher index + 0.30 x lower index + surcharges). Not validated, not the headline — do not present it as the carrier's risk score."
    },
    "carrier_score": {
      "type": [
        "number",
        "null"
      ],
      "description": "0-100, higher = riskier. Under v0.5 this equals legacy_composite.score (kept for backward compatibility); under v0/v0.3/v0.4 it is that version's headline score"
    },
    "base_score": {
      "$ref": "#/properties/carrier_score",
      "description": "Score before hard-flag surcharges (v0.5: legacy composite base)"
    },
    "surcharge": {
      "$ref": "#/properties/carrier_score",
      "description": "Additional points from hard flags"
    },
    "score_version": {
      "$ref": "#/properties/legal_name",
      "description": "Documented methodology version (\"0.5\" is the served default; \"0\", \"0.3\", \"0.4\" are opt-in)"
    },
    "methodology_note": {
      "$ref": "#/properties/legal_name",
      "description": "One-line description of the weighting used"
    },
    "components": {
      "type": "object",
      "additionalProperties": {
        "$ref": "#/properties/inspection_risk/properties/components/additionalProperties"
      },
      "description": "Flat component map keyed by component name (v0.5: within-index weights of both indices, for backward compatibility; the per-index components live under inspection_risk / crash_risk)"
    },
    "sub_indices": {
      "type": "object",
      "additionalProperties": {
        "type": "object",
        "properties": {
          "label": {
            "type": "string"
          },
          "value": {
            "type": [
              "number",
              "null"
            ],
            "description": "Sub-index 0-100, population-relative"
          },
          "weight": {
            "type": "number",
            "description": "Sub-index weight in the composite"
          }
        },
        "additionalProperties": true
      },
      "description": "v0.3 only: inspection_risk / crash_risk sub-indices (0-100) and their weights"
    },
    "indices": {
      "type": "object",
      "additionalProperties": {
        "$ref": "#/properties/inspection_risk"
      },
      "description": "v0.4 only: inspection_risk / crash_risk first-class indices (0-100), each with components, percentile basis and band"
    },
    "composite": {
      "type": "object",
      "properties": {
        "carrier_score": {
          "type": [
            "number",
            "null"
          ]
        },
        "base_score": {
          "type": [
            "number",
            "null"
          ]
        },
        "surcharge": {
          "type": [
            "number",
            "null"
          ]
        },
        "rule": {
          "type": "string"
        },
        "rule_text": {
          "type": "string"
        },
        "note": {
          "type": "string"
        }
      },
      "additionalProperties": true,
      "description": "v0.4 only: how the headline carrier_score is derived from the two indices"
    },
    "flags": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Hard flags (OOS order, no insurance, reincarnation link)"
    },
    "data_sufficiency": {
      "$ref": "#/properties/carrier_score",
      "description": "0-1: share of the score resting on observed vs neutral-imputed data"
    },
    "scored_as_of": {
      "$ref": "#/properties/legal_name",
      "description": "Date of the scoring run (YYYY-MM-DD)"
    },
    "disclaimer": {
      "type": "string",
      "description": "Methodology disclaimer — relay verbatim"
    }
  },
  "required": [
    "dot_number",
    "components",
    "flags"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Generate a timestamped Montgomery file — a carrier-selection evidence report — for a carrier by US DOT number. Since Montgomery v. Caribe Transport II (SCOTUS, May 2026), freight brokers are exposed to state-law negligent-selection claims and need documented, timestamped, safety-data-based carrier selection. This report is that artifact: the two risk indices (inspection / compliance risk and crash risk, each with its components, percentiles, activity-band context and its own historical-validation line), the legacy composite (labelled backward-compatibility only), hard flags, FMCSA safety rating, and the methodology disclaimer, dated as of the scoring run. A booking agent should generate and retain this file at the moment a carrier is selected for a load. Args: - dot_number: US DOT number, digits only - format: "text" (default; the filing-ready plain-text report, available on the free tier) or "json" (structured fields; requires an API key on the monitor or compliance tier) Returns: format="text" gives the plain-text report (structured field report_text); format="json" gives structured fields { report, generated, dot_number, legal_name, dba_name, safety_rating, status_code, power_units, inspection_risk, crash_risk, legacy_composite (v0.5), carrier_score (backward-compatible), components, flags, data_sufficiency, score_version, scored_as_of, disclaimer } (v0.4 parquets return indices + composite instead). Every report embeds the disclaimer verbatim — keep it when storing or quoting the report. Audit archive (paid tiers): every report generated with an API key is stored immutably server-side and the result carries audit_entry_id + sha256 (SHA-256 of the plain-text report). Quote both when citing the report; later, verify_evidence(entry_id) proves the archived copy is unchanged and audit_entries lists what was generated. Monitor keys can retrieve the last 90 days (2,000 reports/month); Compliance keys have unlimited retention and reports. Errors: 403 if format=json without an API key; 404 unknown DOT; 429 if a Monitor key has used its 2,000 reports this month (upgrade hint in the message); 503 if scores are not computed yet.

{
  "type": "object",
  "properties": {
    "dot_number": {
      "type": "string",
      "pattern": "^\\d{1,8}$",
      "description": "US DOT number of the carrier, digits only (e.g. \"1234567\")"
    },
    "format": {
      "type": "string",
      "enum": [
        "text",
        "json"
      ],
      "default": "text",
      "description": "\"text\" = filing-ready report (free tier); \"json\" = structured fields (requires API key)"
    }
  },
  "required": [
    "dot_number"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

{
  "type": "object",
  "properties": {
    "report_text": {
      "type": "string",
      "description": "Filing-ready plain-text evidence report (format=\"text\")"
    },
    "audit_entry_id": {
      "type": "string",
      "description": "Paid tiers: id of the immutable archived copy of this report (use with verify_evidence / audit_entries)"
    },
    "sha256": {
      "type": "string",
      "description": "Paid tiers: SHA-256 of the archived plain-text report — cite it alongside the entry id"
    },
    "report": {
      "type": "string",
      "description": "Report title line (format=\"json\")"
    },
    "generated": {
      "type": [
        "string",
        "null"
      ],
      "description": "Report generation date (YYYY-MM-DD)"
    },
    "dot_number": {
      "type": "string"
    },
    "legal_name": {
      "$ref": "#/properties/generated"
    },
    "dba_name": {
      "$ref": "#/properties/legal_name"
    },
    "safety_rating": {
      "$ref": "#/properties/legal_name"
    },
    "status_code": {
      "$ref": "#/properties/legal_name"
    },
    "power_units": {
      "type": [
        "number",
        "null"
      ]
    },
    "inspection_risk": {
      "type": "object",
      "properties": {
        "label": {
          "type": "string"
        },
        "description": {
          "type": "string"
        },
        "score": {
          "type": [
            "number",
            "null"
          ],
          "description": "Index 0-100 incl. its own surcharge, higher = riskier"
        },
        "base": {
          "type": [
            "number",
            "null"
          ],
          "description": "Percentile blend before surcharge (0-100)"
        },
        "surcharge": {
          "type": [
            "number",
            "null"
          ]
        },
        "surcharges_applied": {
          "type": "array",
          "items": {
            "type": "string"
          }
        },
        "percentile_basis": {
          "type": "string",
          "description": "\"global\" or \"banded\" (24m inspection-activity band)"
        },
        "band": {
          "type": [
            "string",
            "null"
          ],
          "description": "Carrier's 24m inspection-count band"
        },
        "band_note": {
          "type": "string"
        },
        "data_sufficiency": {
          "type": [
            "number",
            "null"
          ]
        },
        "components": {
          "type": "object",
          "additionalProperties": {
            "type": "object",
            "properties": {
              "label": {
                "type": "string",
                "description": "Human-readable component label"
              },
              "value": {
                "type": [
                  "number",
                  "null"
                ],
                "description": "Raw component value"
              },
              "percentile": {
                "type": [
                  "number",
                  "null"
                ],
                "description": "Population percentile of the value, 0-1"
              },
              "weight": {
                "type": "number",
                "description": "Component weight in the base score"
              }
            },
            "required": [
              "label"
            ],
            "additionalProperties": true
          }
        },
        "validation": {
          "type": "object",
          "properties": {
            "auc_holdout": {
              "type": "string",
              "description": "Held-out AUC range on the index's own outcome"
            },
            "auc_post_selection_holdout": {
              "type": "string"
            },
            "top_decile_lift": {
              "type": "string"
            },
            "label": {
              "type": "string",
              "description": "The future outcome the index was validated against"
            },
            "holdout_origins": {
              "type": "array",
              "items": {
                "type": "string"
              }
            },
            "post_selection_origin": {
              "type": [
                "string",
                "null"
              ]
            },
            "source": {
              "type": "string",
              "description": "Path of the validation report in docs/research"
            },
            "text": {
              "type": "string",
              "description": "One-line validation statement — relay with the index"
            }
          },
          "additionalProperties": true,
          "description": "v0.5: this index's own historical validation (point-in-time backtest, held-out cohorts)"
        }
      },
      "additionalProperties": true,
      "description": "v0.5: inspection / compliance risk index with components and validation"
    },
    "crash_risk": {
      "$ref": "#/properties/inspection_risk",
      "description": "v0.5: crash risk index with components and validation"
    },
    "legacy_composite": {
      "type": "object",
      "properties": {
        "score": {
          "type": [
            "number",
            "null"
          ],
          "description": "Legacy composite 0-100 (== top-level carrier_score)"
        },
        "base_score": {
          "type": [
            "number",
            "null"
          ]
        },
        "surcharge": {
          "type": [
            "number",
            "null"
          ]
        },
        "rule": {
          "type": "string"
        },
        "rule_text": {
          "type": "string"
        },
        "validated": {
          "type": "boolean",
          "description": "Always false: the composite is not validated or gated"
        },
        "note": {
          "type": "string"
        }
      },
      "additionalProperties": true,
      "description": "v0.5: legacy composite, backward compatibility only"
    },
    "carrier_score": {
      "$ref": "#/properties/power_units",
      "description": "0-100, higher = riskier (v0.5: == legacy_composite.score)"
    },
    "base_score": {
      "$ref": "#/properties/power_units"
    },
    "surcharge": {
      "$ref": "#/properties/power_units"
    },
    "score_version": {
      "$ref": "#/properties/legal_name"
    },
    "methodology_note": {
      "$ref": "#/properties/legal_name"
    },
    "components": {
      "type": "object",
      "additionalProperties": {
        "$ref": "#/properties/inspection_risk/properties/components/additionalProperties"
      }
    },
    "sub_indices": {
      "type": "object",
      "additionalProperties": {
        "type": "object",
        "properties": {
          "label": {
            "type": "string"
          },
          "value": {
            "type": [
              "number",
              "null"
            ],
            "description": "Sub-index 0-100, population-relative"
          },
          "weight": {
            "type": "number",
            "description": "Sub-index weight in the composite"
          }
        },
        "additionalProperties": true
      }
    },
    "indices": {
      "type": "object",
      "additionalProperties": {
        "$ref": "#/properties/inspection_risk"
      }
    },
    "composite": {
      "type": "object",
      "properties": {
        "carrier_score": {
          "type": [
            "number",
            "null"
          ]
        },
        "base_score": {
          "type": [
            "number",
            "null"
          ]
        },
        "surcharge": {
          "type": [
            "number",
            "null"
          ]
        },
        "rule": {
          "type": "string"
        },
        "rule_text": {
          "type": "string"
        },
        "note": {
          "type": "string"
        }
      },
      "additionalProperties": true
    },
    "flags": {
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "data_sufficiency": {
      "$ref": "#/properties/power_units"
    },
    "scored_as_of": {
      "$ref": "#/properties/legal_name"
    },
    "disclaimer": {
      "type": "string"
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Batch risk check for a list of carriers by US DOT number (max 100 per call): score summary and hard flags for each. Use when an agent is screening multiple candidate carriers for a load, or re-checking a broker's active carrier roster ("did any of my carriers pick up an out-of-service order or drop insurance?"). For a full breakdown of any single carrier that looks risky here, follow up with carrier_score or montgomery_file. Args: - dot_numbers: array of DOT number strings, 1-100 entries Returns JSON: { scored_as_of, requested, found, carriers: [{ dot_number, legal_name, inspection_risk (0-100 inspection / compliance risk index, higher = riskier), crash_risk (0-100 crash risk index), carrier_score (legacy composite under v0.5 — backward compatibility only; use the two indices), data_sufficiency, flags: string[] }], not_found: string[], disclaimer }. DOTs in not_found are absent from the scored population — verify them with carrier_lookup; an unknown DOT on your roster is itself a red flag. Errors: 400 if the list is empty or exceeds 100 (split into batches); 503 if scores are not computed yet.

{
  "type": "object",
  "properties": {
    "dot_numbers": {
      "type": "array",
      "items": {
        "type": "string",
        "pattern": "^\\d{1,8}$",
        "description": "US DOT number of the carrier, digits only (e.g. \"1234567\")"
      },
      "minItems": 1,
      "maxItems": 100,
      "description": "US DOT numbers to check, 1-100 per call"
    }
  },
  "required": [
    "dot_numbers"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

{
  "type": "object",
  "properties": {
    "scored_as_of": {
      "type": [
        "string",
        "null"
      ],
      "description": "Date of the scoring run (YYYY-MM-DD)"
    },
    "requested": {
      "type": "number",
      "description": "How many DOT numbers were requested"
    },
    "found": {
      "type": "number",
      "description": "How many were found in the scored population"
    },
    "carriers": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "dot_number": {
            "type": "string"
          },
          "legal_name": {
            "type": [
              "string",
              "null"
            ]
          },
          "carrier_score": {
            "type": [
              "number",
              "null"
            ],
            "description": "0-100, higher = riskier (v0.5: legacy composite, backward compatibility only — use the two indices)"
          },
          "data_sufficiency": {
            "type": [
              "number",
              "null"
            ]
          },
          "inspection_risk": {
            "type": [
              "number",
              "null"
            ],
            "description": "Inspection / compliance risk index 0-100 (v0.5 headline; also present for v0.3/v0.4 parquets)"
          },
          "crash_risk": {
            "type": [
              "number",
              "null"
            ],
            "description": "Crash risk index 0-100 (v0.5 headline; also present for v0.3/v0.4 parquets)"
          },
          "flags": {
            "type": "array",
            "items": {
              "type": "string"
            }
          }
        },
        "required": [
          "dot_number"
        ],
        "additionalProperties": true
      },
      "description": "Score summary per found carrier"
    },
    "not_found": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Requested DOTs absent from the scored population"
    },
    "disclaimer": {
      "type": "string",
      "description": "Methodology disclaimer — relay verbatim"
    }
  },
  "required": [
    "requested",
    "found",
    "carriers",
    "not_found"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Save a named list of carriers (by US DOT number) for continuous monitoring. Requires a paid CarrierScore API key (Monitor or Compliance tier) — connect with your key via OAuth (or set CARRIERSCORE_API_KEY on a self-hosted server); the free tier gets a 403 with an upgrade link. Once saved, CarrierScore diffs every carrier on the list against the previous day's scoring run after each daily run and records alerts: new out-of-service order (critical), operating authority lost (critical), insurance filing lapsed (high), operating status leaving Active (high), risk score up 10+ points (medium), high-confidence reincarnated-carrier link appearing (medium). Alerts are always retrievable with list_alerts; optionally they are also pushed to a webhook (JSON POST, HMAC-signed via the X-CarrierScore-Signature header with the per-key secret from GET /v1/lists) and/or summarized in one daily digest email. Use this when a broker asks to "watch" or "keep an eye on" their carrier roster. Caps: 500 DOTs total across all lists on the Monitor tier, 5000 on Compliance; up to 50 lists per key. Saving the same DOT twice in one list is deduped. Args: - name: short label for the list (1-100 chars) - dot_numbers: array of DOT number strings (1-8 digits each) - webhook_url (optional): https URL to POST new alerts to - email (optional): address for the daily digest Returns JSON: { list_id, name, dots, created, updated, webhook_url?, email? }. Keep list_id — list_alerts needs it. Errors: 403 without a paid key; 400 on invalid DOTs, empty list, or exceeding the tier cap (message says which); 401 bad key.

{
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "minLength": 1,
      "maxLength": 100,
      "description": "List name, e.g. \"Active roster Q3\""
    },
    "dot_numbers": {
      "type": "array",
      "items": {
        "type": "string",
        "pattern": "^\\d{1,8}$",
        "description": "US DOT number of the carrier, digits only (e.g. \"1234567\")"
      },
      "minItems": 1,
      "maxItems": 5000,
      "description": "US DOT numbers to monitor"
    },
    "webhook_url": {
      "type": "string",
      "format": "uri",
      "description": "Optional https URL to receive alert POSTs"
    },
    "email": {
      "type": "string",
      "format": "email",
      "description": "Optional daily digest email"
    }
  },
  "required": [
    "name",
    "dot_numbers"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

{
  "type": "object",
  "properties": {
    "list_id": {
      "type": "string",
      "description": "Saved list id (lst_...) — use with list_alerts"
    },
    "name": {
      "type": "string",
      "description": "List name"
    },
    "dots": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "US DOT numbers on the list (deduped)"
    },
    "created": {
      "type": "string",
      "description": "Creation timestamp (ISO 8601 UTC)"
    },
    "updated": {
      "type": "string",
      "description": "Last update timestamp (ISO 8601 UTC)"
    },
    "webhook_url": {
      "type": "string",
      "description": "Alert webhook URL, if configured"
    },
    "email": {
      "type": "string",
      "description": "Daily digest email, if configured"
    }
  },
  "required": [
    "list_id",
    "name",
    "dots"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Retrieve the alert history for a saved carrier list (see save_carrier_list), newest first. Requires the same paid API key that saved the list. Each alert records one change detected between consecutive daily scoring runs for one carrier: type (oos_order_activated, authority_lost, insurance_lapsed, status_changed, inspection_risk_jump, crash_risk_jump, score_jump, reincarnation_link), severity (critical / high / medium / low), the field that changed with its before/after values, the DOT and legal name, and the scoring dates compared. inspection_risk_jump / crash_risk_jump (index base up >= 10 points, medium) are the primary deterioration signals; score_jump on the legacy composite is emitted at low severity for backward compatibility. Use it to answer "did anything change on my carrier list?" — critical alerts (new OOS order, authority lost) mean the carrier should not be dispatched until verified; follow up with carrier_score or montgomery_file for the full picture. Args: - list_id: the lst_... id returned by save_carrier_list - since (optional): YYYY-MM-DD; only alerts from scoring runs on/after this date Returns JSON: { list_id, since, count, alerts: [{ ts, as_of, prev_as_of, list_id, list_name, dot, legal_name, type, severity, field, before, after }] }. An empty alerts array means no monitored change since the given date (alerts only exist once two daily scoring runs have happened). Errors: 403 without a paid key; 404 if the list id is unknown for this key; 400 if since is not YYYY-MM-DD.

{
  "type": "object",
  "properties": {
    "list_id": {
      "type": "string",
      "pattern": "^lst_[A-Za-z0-9_-]+$",
      "description": "Saved list id from save_carrier_list"
    },
    "since": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Only alerts from scoring runs on/after this date (YYYY-MM-DD)"
    }
  },
  "required": [
    "list_id"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

{
  "type": "object",
  "properties": {
    "list_id": {
      "type": "string"
    },
    "since": {
      "type": [
        "string",
        "null"
      ],
      "description": "Lower bound applied (YYYY-MM-DD) or null"
    },
    "count": {
      "type": "number",
      "description": "Number of alerts returned"
    },
    "alerts": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "ts": {
            "type": "string",
            "description": "When the alert was recorded (ISO 8601 UTC)"
          },
          "as_of": {
            "type": "string",
            "description": "Scoring run date that surfaced the change (YYYY-MM-DD)"
          },
          "prev_as_of": {
            "type": "string",
            "description": "Previous scoring run date compared against"
          },
          "list_id": {
            "type": "string"
          },
          "list_name": {
            "type": "string"
          },
          "dot": {
            "type": "string",
            "description": "US DOT number"
          },
          "legal_name": {
            "type": [
              "string",
              "null"
            ]
          },
          "type": {
            "type": "string",
            "description": "oos_order_activated | authority_lost | insurance_lapsed | status_changed | score_jump | reincarnation_link"
          },
          "severity": {
            "type": "string",
            "description": "critical | high | medium"
          },
          "field": {
            "type": "string",
            "description": "Score field that changed"
          },
          "before": {
            "description": "Value in the previous scoring run"
          },
          "after": {
            "description": "Value in the current scoring run"
          }
        },
        "required": [
          "ts",
          "as_of",
          "list_id",
          "dot",
          "type",
          "severity"
        ],
        "additionalProperties": true
      },
      "description": "Alert history, newest first"
    }
  },
  "required": [
    "list_id",
    "count",
    "alerts"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

List the immutable audit-archive entries for the caller's API key: every Montgomery evidence report the key generated (text or json), newest first, each with its entry id, generation timestamp, DOT number, scoring date, methodology version and the SHA-256 of the archived report text. Requires a paid CarrierScore API key. Use it to answer "which carriers did we generate evidence for, and when?" and to find the entry id to cite or verify for a given carrier and date. Monitor keys see the last 90 days; Compliance keys see everything ever archived. Args: - dot_number (optional): only entries for this US DOT number - since (optional): YYYY-MM-DD; only entries generated on/after this date (UTC) - limit (optional): 1-500, default 50 Returns JSON: { tier, retention_days, total_entries, matched, count, entries: [{ entry_id, generated_at, dot_number, sha256, format_requested, scored_as_of, score_version }] }. Errors: 403 without a paid key; 400 if since is malformed.

{
  "type": "object",
  "properties": {
    "dot_number": {
      "type": "string",
      "pattern": "^\\d{1,8}$",
      "description": "US DOT number of the carrier, digits only (e.g. \"1234567\")"
    },
    "since": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
      "description": "Only entries generated on/after this date (YYYY-MM-DD, UTC)"
    },
    "limit": {
      "type": "integer",
      "minimum": 1,
      "maximum": 500,
      "description": "Max entries to return (default 50)"
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

{
  "type": "object",
  "properties": {
    "tier": {
      "type": "string",
      "description": "Caller's tier (monitor / compliance)"
    },
    "retention_days": {
      "type": [
        "number",
        "null"
      ],
      "description": "Retrieval window in days (monitor 90; compliance null = unlimited)"
    },
    "total_entries": {
      "type": "number",
      "description": "All entries ever archived for this key"
    },
    "matched": {
      "type": "number",
      "description": "Entries matching the filters within the retention window"
    },
    "count": {
      "type": "number",
      "description": "Entries returned (<= limit)"
    },
    "entries": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "entry_id": {
            "type": "string",
            "description": "Archive entry id: <dot>_<UTC timestamp>_<sha8>"
          },
          "generated_at": {
            "type": "string",
            "description": "When the report was generated (ISO 8601 UTC)"
          },
          "dot_number": {
            "type": "string"
          },
          "sha256": {
            "type": "string",
            "description": "SHA-256 of the archived plain-text report"
          },
          "format_requested": {
            "type": "string",
            "description": "\"text\" or \"json\" as originally requested"
          },
          "scored_as_of": {
            "type": [
              "string",
              "null"
            ],
            "description": "Scoring run the report was built from"
          },
          "score_version": {
            "type": [
              "string",
              "null"
            ]
          },
          "tier": {
            "type": "string"
          }
        },
        "required": [
          "entry_id",
          "generated_at",
          "dot_number",
          "sha256"
        ],
        "additionalProperties": true
      },
      "description": "Newest first"
    }
  },
  "required": [
    "tier",
    "retention_days",
    "total_entries",
    "matched",
    "count",
    "entries"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Verify an archived Montgomery evidence report by its audit entry id: CarrierScore re-reads the immutable stored copy, recomputes its SHA-256 and reports whether it matches the hash recorded at generation time (and, optionally, a hash the caller supplies — e.g. the sha256 printed on a broker's filed copy). Requires the same paid API key that generated the report. Use it when a broker or auditor needs to prove that a filed evidence report is exactly what CarrierScore produced on the stated date. match=true means the archived report is byte-identical to what was served; match_supplied compares against the caller's own hash. Follow up with the audit_entries list to find ids, or with montgomery_file to generate a fresh report. Args: - entry_id: the audit_entry_id returned by montgomery_file (also listed by audit_entries) - sha256 (optional): a 64-hex SHA-256 to compare against the archived report (text or canonical json) Returns JSON: { entry_id, dot_number, generated_at, scored_as_of, score_version, format_requested, sha256_stored, sha256_computed, match, sha256_json_stored, sha256_json_computed, match_json, sha256_supplied?, match_supplied? }. Errors: 403 without a paid key, or (Monitor tier) if the entry is older than the 90-day retrieval window; 404 if the entry id is unknown for this key.

{
  "type": "object",
  "properties": {
    "entry_id": {
      "type": "string",
      "pattern": "^\\d{1,8}_\\d{8}T\\d{12}Z_[0-9a-f]{8}$",
      "description": "Audit entry id from montgomery_file / audit_entries"
    },
    "sha256": {
      "type": "string",
      "pattern": "^[0-9a-fA-F]{64}$",
      "description": "Optional SHA-256 to compare against the archived report"
    }
  },
  "required": [
    "entry_id"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

{
  "type": "object",
  "properties": {
    "entry_id": {
      "type": "string"
    },
    "dot_number": {
      "type": [
        "string",
        "null"
      ]
    },
    "generated_at": {
      "type": [
        "string",
        "null"
      ]
    },
    "scored_as_of": {
      "type": [
        "string",
        "null"
      ]
    },
    "score_version": {
      "type": [
        "string",
        "null"
      ]
    },
    "format_requested": {
      "type": [
        "string",
        "null"
      ]
    },
    "sha256_stored": {
      "type": [
        "string",
        "null"
      ],
      "description": "Hash recorded when the report was archived"
    },
    "sha256_computed": {
      "type": "string",
      "description": "Hash recomputed now from the stored report text"
    },
    "match": {
      "type": "boolean",
      "description": "true = the archived report is byte-identical to what was served"
    },
    "sha256_json_stored": {
      "type": [
        "string",
        "null"
      ]
    },
    "sha256_json_computed": {
      "type": [
        "string",
        "null"
      ]
    },
    "match_json": {
      "type": [
        "boolean",
        "null"
      ]
    },
    "sha256_supplied": {
      "type": "string",
      "description": "Echo of the hash the caller supplied, if any"
    },
    "match_supplied": {
      "type": "boolean",
      "description": "Whether the supplied hash matches the archived report"
    }
  },
  "required": [
    "entry_id",
    "sha256_computed",
    "match"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}