FabTally Decode

PAID $0.003 (x402, USDC on Base). FLAGSHIP: decode EVM event LOGS to human-readable JSON. Give {chain, tx_hash} to decode every log in a transaction, OR {chain, address, topics[], data} for a single log; optional {abi}. Returns each event's name, canonical signature and named/typed args — correctly handling tuple/array/nested params, anonymous events, and indexed vs non-indexed. Resolves the ABI via Sourcify/Blockscout + 4byte event signatures when none is supplied. Without payment returns the x402 challenge; pass x_payment to settle.

{
  "type": "object",
  "properties": {
    "chain": {
      "type": "string",
      "enum": [
        "ethereum",
        "base",
        "arbitrum",
        "optimism",
        "polygon",
        "bsc"
      ],
      "description": "EVM chain: ethereum | base | arbitrum | optimism | polygon | bsc."
    },
    "tx_hash": {
      "type": "string",
      "description": "Transaction hash (0x + 64 hex) — decodes every event log in the tx."
    },
    "address": {
      "type": "string",
      "description": "Contract address of a single log (used with topics + data)."
    },
    "topics": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Log topics array (topic0 is the event signature hash for non-anonymous events)."
    },
    "data": {
      "type": "string",
      "description": "Log data field (0x hex) holding the non-indexed args."
    },
    "abi": {
      "anyOf": [
        {
          "type": "array"
        },
        {
          "type": "string"
        }
      ],
      "description": "Optional contract ABI (JSON array or JSON string). If omitted, the ABI is resolved from the verified source (Sourcify/Blockscout) or 4byte.directory."
    },
    "x_payment": {
      "type": "string",
      "description": "x402 payment payload (base64) for this PAID decode. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "chain"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

PAID $0.002 (x402, USDC on Base). Decode a contract function call. Give {chain, to?, data, abi?}; get the 4-byte selector resolved to a function signature (via provided ABI, the verified contract source, or 4byte.directory) plus fully decoded, typed arguments (tuples/arrays/nested included). Without payment returns the x402 challenge.

{
  "type": "object",
  "properties": {
    "chain": {
      "type": "string",
      "enum": [
        "ethereum",
        "base",
        "arbitrum",
        "optimism",
        "polygon",
        "bsc"
      ],
      "description": "EVM chain: ethereum | base | arbitrum | optimism | polygon | bsc."
    },
    "to": {
      "type": "string",
      "description": "Contract address the call targets (optional; enables verified-ABI resolution)."
    },
    "data": {
      "type": "string",
      "description": "Calldata (0x hex, at least the 4-byte selector)."
    },
    "abi": {
      "anyOf": [
        {
          "type": "array"
        },
        {
          "type": "string"
        }
      ],
      "description": "Optional contract ABI (JSON array or JSON string). If omitted, the ABI is resolved from the verified source (Sourcify/Blockscout) or 4byte.directory."
    },
    "x_payment": {
      "type": "string",
      "description": "x402 payment payload (base64) for this PAID decode. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "chain",
    "data"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

PAID $0.001 (x402, USDC on Base). Resolve a 4-byte function selector (0x + 8 hex) OR a 32-byte event topic hash (0x + 64 hex) to its human-readable signature(s) via 4byte.directory + openchain.xyz. Returns all matches (selectors can collide) with a verified flag. Without payment returns the x402 challenge; pass x_payment to settle.

{
  "type": "object",
  "properties": {
    "selector": {
      "type": "string",
      "description": "A 4-byte function selector (0x + 8 hex) or a 32-byte event topic hash (0x + 64 hex)."
    },
    "x_payment": {
      "type": "string",
      "description": "x402 payment payload (base64) for this PAID decode. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "selector"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

PAID $0.002 (x402, USDC on Base). Fetch the verified ABI + metadata for a contract. Give {address, chain}; get the ABI JSON, verification status/source (Sourcify or Blockscout), the callable function/event signatures, and full proxy-implementation resolution (EIP-1967/1822/OZ-legacy/beacon) — returning the implementation's ABI when it's a proxy. Without payment returns the x402 challenge; pass x_payment to settle.

{
  "type": "object",
  "properties": {
    "chain": {
      "type": "string",
      "enum": [
        "ethereum",
        "base",
        "arbitrum",
        "optimism",
        "polygon",
        "bsc"
      ],
      "description": "EVM chain: ethereum | base | arbitrum | optimism | polygon | bsc."
    },
    "address": {
      "type": "string",
      "description": "Contract address (0x + 40 hex)."
    },
    "x_payment": {
      "type": "string",
      "description": "x402 payment payload (base64) for this PAID decode. If supplied it is forwarded as the X-PAYMENT header to settle the call and return the real result instead of a 402 challenge. Omit to get the price challenge first."
    }
  },
  "required": [
    "chain",
    "address"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}