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Delx Commerce — X402 Response Header Shape Validator
x402
Delx Commerce — X402 Response Header Shape Validator is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Validates and parses an X402 payment response header to confirm it matches the expected shape/encoding, returning a verifiable pass/fail result with evidence.
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object containing: a 'status' field ('pass' or 'fail'), a 'result' object with 'shape_valid' boolean and 'encoding' type (e.g. 'base64_json'), an 'operation' identifier, a 'schema' version string, and an 'evidence' block with SHA-256 hash of the input, a 'retained: false' flag confirming no data storage, and external_calls count (0).
Example use cases
Debug malformed x402 payment header
“I'm getting errors when processing x402 payment responses from this API — can you validate this header string for me and tell me if it's correctly shaped: 'X-Payment-Response: eyJ0eXBlIjoicGF5bWVudCJ9'?”
Pre-flight x402 header check in agent pipeline
“Before my agent accepts this x402 payment confirmation, verify that the response header 'X-Payment-Response: eyJlbmNvZGluZyI6ImJhc2U2NF9qc29uIn0=' has the right shape and encoding so we don't process a malformed payment receipt.”
Audit x402 header integrity with evidence
“I need to audit this x402 response header for correctness and get back a SHA-256 hash of the input as evidence that it was checked — here's the header: 'X-Payment-Response: eyJzdGF0dXMiOiJwYWlkIn0='.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/x402-response-header-shape?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a lightweight, stateless, verifiable check that an X402 response header conforms to the expected shape and encoding before trusting or forwarding a payment confirmation. Prefer it over manual parsing when you need cryptographic evidence (SHA-256 of input) that the check was performed, or when operating in an agent pipeline that requires auditability and proof of non-retention of sensitive header data.
Side effects
- Header string exceeds 8192 character limit — request rejected
- Malformed or non-x402 header — shape_valid returns false with status 'fail'
- Empty or missing header field — validation cannot proceed
- Network timeout or service unavailability — HTTP 5xx response
- Invalid payment / insufficient USDC balance — HTTP 402 returned before processing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| header | string | Header supplied to X402 Response Header Shape; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"encoding": "base64_json",
"shape_valid": true
},
"schema": "delx/util-x402-response-header-shape/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "568768ddc248cedc248ab1ccfdcc4bd01ee9005aa08eff63b5e7df553e7ff724",
"external_calls": 0
},
"operation": "delivery_contract:x402_response_header_shape"
}
}Tags
x402
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