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Delx Commerce — X402 Challenge Version Check
x402
Delx Commerce — X402 Challenge Version 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).
Checks whether a given x402 protocol version is supported among a list of supported versions, returning a verifiable result with cryptographic 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: the matched version integer, a boolean indicating if it is supported, the full list of supported versions, a pass/fail status, the operation name, the schema identifier, and an evidence block with a SHA-256 hash of the input, a flag confirming no data was retained, and a count of zero external calls made.
Example use cases
Version negotiation before payment
“Before I initiate an x402 payment, check if version 2 is compatible with the supported versions [1, 2] and return proof that the check was done without retaining my data.”
Protocol compatibility audit
“I need to verify that x402 challenge version 1 is included in the supported versions list [1, 2, 3, 4] and get back a SHA-256 evidence hash I can log for compliance.”
Agent handshake version check
“My agent needs to confirm x402 version 3 is supported among [1, 2, 3] before proceeding — can you run the version check and return the full result including whether it passed?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/x402-challenge-version-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent or payment system needs a cheap, verifiable, tamper-evident check of x402 protocol version compatibility — especially when cryptographic evidence of the computation (input hash, no retention, no external calls) is required for audit or compliance. Prefer this over a local check when you need an on-chain-payable, verifiable delivery proof rather than a simple in-process comparison.
Side effects
- Version integer not found in supported_versions list — returns supported: false
- Malformed input (non-integer version or array exceeding 256 items) — likely 400 Bad Request
- Payment not completed via x402 — 402 Payment Required before result is returned
- Empty supported_versions array — result may return supported: false with no match
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| version | integer | Version supplied to X402 Challenge Version Check; used only for this bounded calculation and processed in memory without retention. |
| supported_versions | array | Supported Versions supplied to X402 Challenge Version Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"version": 2,
"supported": true,
"supported_versions": [
1,
2
]
},
"schema": "delx/util-x402-challenge-version-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "19a97d5b88dfc156ec9b3f1ff4cfb324dd9d18bb96d5ff480a3478193db0eeab",
"external_calls": 0
},
"operation": "delivery_contract:x402_challenge_version_check"
}
}Tags
x402
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