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vAPI x402 Decoder
x402
vAPI x402 Decoder is a paid API for AI agents from api-staging.vapinetwork.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Decodes and explains what an EIP-712 typed EVM payment authorization actually permits before the user signs it.
Price / call$0.005
Success—
StatusUnknown
How this service works
Decode what an EVM payment authorization actually authorizes before signing.
Output
A human-readable breakdown of what the EIP-712 typed data authorizes, including the payment amount, recipient address, token, conditions, and other relevant fields extracted from the structured payment authorization payload.
Example use cases
Audit payment before agent signs
“My AI agent is about to sign an x402 payment authorization — can you decode this EIP-712 typed data first so I can confirm what it's actually authorizing before anything gets submitted?”
Detect suspicious payment authorization
“I got an x402 payment request and something feels off — decode this EIP-712 typed data and tell me exactly who the recipient is, how much it's authorizing, and under what conditions.”
Debug x402 integration during development
“I'm building an x402 payment flow and need to verify my typed data is structured correctly — decode this EIP-712 JSON and show me what the authorization actually says.”
Technical details
Endpoint
POSThttps://api-staging.vapinetwork.ai/x402/decodeWhen to prefer
Use this endpoint when an AI agent or user needs to inspect the contents of an x402 EIP-712 payment authorization before signing, particularly to audit what amount, recipient, and conditions are being approved. Prefer this over manual EIP-712 parsing when you need a fast, structured, human-readable breakdown of a payment payload without building your own decoder.
Side effects
- Malformed or invalid EIP-712 JSON string returns a parse error
- Unsupported EIP-712 domain or type structure may yield incomplete decoding
- Missing required typedData field returns a validation error
- Signature provided without matching typedData may produce inconsistent results
- Staging environment may have reduced availability or changed behavior
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| signature | string | |
| typedData | string | JSON string of the EIP-712 typed data |
Tags
x402
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