Tool detail

vAPI x402 decoder

Decodes an EIP-712 typed-data payment authorization into what it actually authorizes, before it is signed.

Categories: Payments, Utilities

Use when

check what a payment authorization actually permits before signing it

Not for

not a signer — decodes and describes only, never signs or submits

Inputs

POST JSON body: { typedData: string (required, JSON of EIP-712 typed data); signature: string (optional) }

Admitted input schema

{
  "type": "object",
  "properties": {
    "signature": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096
    },
    "typedData": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "JSON string of the EIP-712 typed data"
    }
  },
  "required": [
    "typedData"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://api-staging.vapinetwork.ai/x402/decode

Payment

Protocol: x402
Listed price: 0.005 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://api-staging.vapinetwork.ai/x402/decode
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z