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Delx Commerce — X402 Challenge Shape Check
x402
Delx Commerce — X402 Challenge Shape Check 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 that an X402 payment challenge object has the correct structure and required fields, returning a shape-validity report with field diagnostics.
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 indicating whether the challenge is shape-valid (shape_valid: true/false), the count of accept entries (accept_count), a list of any missing fields (missing_fields), an overall status ('pass' or 'fail'), and an evidence block containing the SHA-256 hash of the input, a flag confirming no data retention, and the count of external calls made (always 0).
Example use cases
Preflight check before payment submission
“Before I send this x402 challenge to my payment agent, can you run a shape check on it and tell me whether it's valid and how many accept entries it has?”
Debugging a malformed x402 challenge
“My x402 integration keeps failing — can you validate this challenge object and list any missing or malformed fields so I can fix it?”
CI pipeline x402 challenge linting
“As part of my test suite, check that this x402 challenge payload conforms to the expected shape and return pass or fail along with the SHA-256 of the input.”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/x402-challenge-shape-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, cheap ($0.001 USDC), trustless, in-memory shape check on an X402 challenge object with no data retention — especially useful as a preflight step before attempting a live payment flow, or when debugging x402 integration issues. Prefer this over manual JSON schema validation when you need a verifiable, signed evidence receipt (SHA-256 of input) proving the check was performed.
Side effects
- Challenge object exceeds 128 properties limit — rejected with validation error
- Malformed JSON input — returns shape_valid: false with missing_fields populated
- Missing required top-level challenge key — request body rejected
- Network or service unavailability — HTTP 5xx error
- Insufficient USDC balance for x402 payment — HTTP 402 payment required before response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| challenge | object | Challenge supplied to X402 Challenge Shape Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"shape_valid": true,
"accept_count": 1,
"missing_fields": []
},
"schema": "delx/util-x402-challenge-shape-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "62072ab7fce77c19843d604f1566016ce4dbe3ea291d11d208433c905228eeab",
"external_calls": 0
},
"operation": "delivery_contract:x402_challenge_shape_check"
}
}Tags
x402
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