Invoice Preflight x402 MCP
Checks UBL invoices against purchase details and recalculates totals. $0.05 USDC per call on Base.
Should I use this
Quality & Safety
A
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
~1,948Tokens (tool definitions)
~7.1 KBTypical response size
Moderate attention impact (1.52% of 128k context)
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"invoice-preflight": {
"url": "https://mcp.dropenginehq.com/api/paid-mcp"
}
}
}Remote endpoints
https://mcp.dropenginehq.com/api/paid-mcpstreamable-httpWhat it can do
Tool inventory
Tools (3)
🟢 Read-only🟡 Write🔴 Delete⚪ Unknown
🟢invoice_preflight(document_xml, document_url, document_base64, mime_type, expected)
Paid invoice check ($0.065 USDC on Base): UBL XML or complete PDF/image invoices up to 3 pages. Returns evidence, amount checks and match/discrepancy/needs_review. No payment or bookkeeping action is taken.
Input Schema
{
"type": "object",
"properties": {
"document_xml": {
"type": "string",
"minLength": 1,
"maxLength": 1000000
},
"document_url": {
"type": "string",
"maxLength": 2048,
"format": "uri"
},
"document_base64": {
"type": "string",
"minLength": 4,
"maxLength": 13500000
},
"mime_type": {
"type": "string",
"enum": [
"application/pdf",
"image/png",
"image/jpeg"
]
},
"expected": {
"type": "object",
"properties": {
"supplier_name": {
"type": "string",
"minLength": 1,
"maxLength": 200
},
"purchase_order": {
"type": "string",
"minLength": 1,
"maxLength": 100
},
"currency": {
"type": "string",
"minLength": 3,
"maxLength": 3
},
"subtotal": {
"type": "string",
"pattern": "^-?\\d+(?:\\.\\d{1,2})?$"
},
"tax": {
"type": "string",
"pattern": "^-?\\d+(?:\\.\\d{1,2})?$"
},
"total": {
"type": "string",
"pattern": "^-?\\d+(?:\\.\\d{1,2})?$"
}
},
"additionalProperties": false
}
},
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"decision": {
"type": "string",
"enum": [
"match",
"discrepancy",
"needs_review"
]
},
"invoice": {
"type": "object",
"properties": {
"number": {
"type": [
"string",
"null"
]
},
"supplier_name": {
"type": [
"string",
"null"
]
},
"purchase_order": {
"type": [
"string",
"null"
]
},
"currency": {
"type": [
"string",
"null"
]
},
"subtotal": {
"type": [
"string",
"null"
]
},
"tax": {
"type": [
"string",
"null"
]
},
"total": {
"type": [
"string",
"null"
]
},
"line_items": {
"type": "array",
"items": {
"type": "object",
"properties": {
"description": {
"type": [
"string",
"null"
]
},
"amount": {
"type": "string"
}
},
"required": [
"description",
"amount"
],
"additionalProperties": false
}
}
},
"required": [
"number",
"supplier_name",
"purchase_order",
"currency",
"subtotal",
"tax",
"total",
"line_items"
],
"additionalProperties": false
},
"checks": {
"type": "array",
"items": {
"type": "object",
"properties": {
"field": {
"type": "string"
},
"status": {
"type": "string",
"enum": [
"match",
"discrepancy",
"needs_review"
]
},
"expected": {
"type": "string"
},
"actual": {
"type": "string"
},
"calculated": {
"type": "string"
}
},
"required": [
"field",
"status"
],
"additionalProperties": false
}
},
"evidence": {
"type": "array",
"items": {
"type": "object",
"properties": {
"field": {
"type": "string"
},
"source": {
"type": "string"
},
"text": {
"type": "string"
}
},
"required": [
"field",
"source",
"text"
],
"additionalProperties": false
}
},
"source_sha256": {
"type": "string"
},
"pages_processed": {
"type": "integer",
"exclusiveMinimum": 0,
"maximum": 9007199254740991
},
"warnings": {
"type": "array",
"items": {
"type": "string"
}
}
},
"required": [
"decision",
"invoice",
"checks",
"evidence",
"source_sha256",
"warnings"
],
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false
}⚪invoice_preflight_10_pages(document_url, document_base64, mime_type, expected)
Paid invoice OCR ($0.09 USDC on Base): process complete PDF/image invoices up to 10 pages. Oversized PDFs are rejected before OCR.
Input Schema
{
"type": "object",
"properties": {
"document_url": {
"type": "string",
"maxLength": 2048,
"format": "uri"
},
"document_base64": {
"type": "string",
"minLength": 4,
"maxLength": 13500000
},
"mime_type": {
"type": "string",
"enum": [
"application/pdf",
"image/png",
"image/jpeg"
]
},
"expected": {
"type": "object",
"properties": {
"supplier_name": {
"type": "string",
"minLength": 1,
"maxLength": 200
},
"purchase_order": {
"type": "string",
"minLength": 1,
"maxLength": 100
},
"currency": {
"type": "string",
"minLength": 3,
"maxLength": 3
},
"subtotal": {
"type": "string",
"pattern": "^-?\\d+(?:\\.\\d{1,2})?$"
},
"tax": {
"type": "string",
"pattern": "^-?\\d+(?:\\.\\d{1,2})?$"
},
"total": {
"type": "string",
"pattern": "^-?\\d+(?:\\.\\d{1,2})?$"
}
},
"additionalProperties": false
}
},
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"decision": {
"type": "string",
"enum": [
"match",
"discrepancy",
"needs_review"
]
},
"invoice": {
"type": "object",
"properties": {
"number": {
"type": [
"string",
"null"
]
},
"supplier_name": {
"type": [
"string",
"null"
]
},
"purchase_order": {
"type": [
"string",
"null"
]
},
"currency": {
"type": [
"string",
"null"
]
},
"subtotal": {
"type": [
"string",
"null"
]
},
"tax": {
"type": [
"string",
"null"
]
},
"total": {
"type": [
"string",
"null"
]
},
"line_items": {
"type": "array",
"items": {
"type": "object",
"properties": {
"description": {
"type": [
"string",
"null"
]
},
"amount": {
"type": "string"
}
},
"required": [
"description",
"amount"
],
"additionalProperties": false
}
}
},
"required": [
"number",
"supplier_name",
"purchase_order",
"currency",
"subtotal",
"tax",
"total",
"line_items"
],
"additionalProperties": false
},
"checks": {
"type": "array",
"items": {
"type": "object",
"properties": {
"field": {
"type": "string"
},
"status": {
"type": "string",
"enum": [
"match",
"discrepancy",
"needs_review"
]
},
"expected": {
"type": "string"
},
"actual": {
"type": "string"
},
"calculated": {
"type": "string"
}
},
"required": [
"field",
"status"
],
"additionalProperties": false
}
},
"evidence": {
"type": "array",
"items": {
"type": "object",
"properties": {
"field": {
"type": "string"
},
"source": {
"type": "string"
},
"text": {
"type": "string"
}
},
"required": [
"field",
"source",
"text"
],
"additionalProperties": false
}
},
"source_sha256": {
"type": "string"
},
"pages_processed": {
"type": "integer",
"exclusiveMinimum": 0,
"maximum": 9007199254740991
},
"warnings": {
"type": "array",
"items": {
"type": "string"
}
}
},
"required": [
"decision",
"invoice",
"checks",
"evidence",
"source_sha256",
"warnings"
],
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false
}⚪invoice_preflight_50_pages(document_url, document_base64, mime_type, expected)
Paid invoice OCR ($0.275 USDC on Base): process complete PDF/image invoices up to 50 pages. Oversized PDFs are rejected before OCR.
Input Schema
{
"type": "object",
"properties": {
"document_url": {
"type": "string",
"maxLength": 2048,
"format": "uri"
},
"document_base64": {
"type": "string",
"minLength": 4,
"maxLength": 13500000
},
"mime_type": {
"type": "string",
"enum": [
"application/pdf",
"image/png",
"image/jpeg"
]
},
"expected": {
"type": "object",
"properties": {
"supplier_name": {
"type": "string",
"minLength": 1,
"maxLength": 200
},
"purchase_order": {
"type": "string",
"minLength": 1,
"maxLength": 100
},
"currency": {
"type": "string",
"minLength": 3,
"maxLength": 3
},
"subtotal": {
"type": "string",
"pattern": "^-?\\d+(?:\\.\\d{1,2})?$"
},
"tax": {
"type": "string",
"pattern": "^-?\\d+(?:\\.\\d{1,2})?$"
},
"total": {
"type": "string",
"pattern": "^-?\\d+(?:\\.\\d{1,2})?$"
}
},
"additionalProperties": false
}
},
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false
}Output Schema
{
"type": "object",
"properties": {
"decision": {
"type": "string",
"enum": [
"match",
"discrepancy",
"needs_review"
]
},
"invoice": {
"type": "object",
"properties": {
"number": {
"type": [
"string",
"null"
]
},
"supplier_name": {
"type": [
"string",
"null"
]
},
"purchase_order": {
"type": [
"string",
"null"
]
},
"currency": {
"type": [
"string",
"null"
]
},
"subtotal": {
"type": [
"string",
"null"
]
},
"tax": {
"type": [
"string",
"null"
]
},
"total": {
"type": [
"string",
"null"
]
},
"line_items": {
"type": "array",
"items": {
"type": "object",
"properties": {
"description": {
"type": [
"string",
"null"
]
},
"amount": {
"type": "string"
}
},
"required": [
"description",
"amount"
],
"additionalProperties": false
}
}
},
"required": [
"number",
"supplier_name",
"purchase_order",
"currency",
"subtotal",
"tax",
"total",
"line_items"
],
"additionalProperties": false
},
"checks": {
"type": "array",
"items": {
"type": "object",
"properties": {
"field": {
"type": "string"
},
"status": {
"type": "string",
"enum": [
"match",
"discrepancy",
"needs_review"
]
},
"expected": {
"type": "string"
},
"actual": {
"type": "string"
},
"calculated": {
"type": "string"
}
},
"required": [
"field",
"status"
],
"additionalProperties": false
}
},
"evidence": {
"type": "array",
"items": {
"type": "object",
"properties": {
"field": {
"type": "string"
},
"source": {
"type": "string"
},
"text": {
"type": "string"
}
},
"required": [
"field",
"source",
"text"
],
"additionalProperties": false
}
},
"source_sha256": {
"type": "string"
},
"pages_processed": {
"type": "integer",
"exclusiveMinimum": 0,
"maximum": 9007199254740991
},
"warnings": {
"type": "array",
"items": {
"type": "string"
}
}
},
"required": [
"decision",
"invoice",
"checks",
"evidence",
"source_sha256",
"warnings"
],
"$schema": "https://json-schema.org/draft/2020-12/schema",
"additionalProperties": false
}Community
Evidence
Recent observations
verifiedversion not recorded3 tools