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X402 Pay-To Address Matcher
x402
X402 Pay-To Address Matcher is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-23).
Validates that a pay-to address in an x402 payment challenge matches an expected merchant address, returning acceptance or rejection with mismatch reasons.
Price / call$0.001
Success—
StatusUnknown
How this service works
X402 Pay To Match: X402 Pay To Match compares challenge pay-to address with an expected merchant address from bounded caller-supplied values without an external provider. Call X402 Pay To Match before paying for or accepting an x402 or agent delivery assembled from caller-supplied challenge and result metadata. Returns contract-specific checks, normalized evidence, mismatch reasons, and an explicit acceptance or rejection status for X402 Pay To Match as versioned deterministic JSON. Price: $0.0…
Output
Returns a versioned deterministic JSON object containing: an explicit accept or reject status, contract-specific validation checks, normalized evidence of both addresses, and detailed mismatch reasons if the addresses do not match.
Example use cases
Pre-payment address fraud check
“I'm about to pay an x402 invoice but I want to make sure the pay-to address '0x1234abcd...' matches the merchant address I enrolled, which is '0x5678efgh...'. Can you verify they match before I authorize the payment?”
Agent delivery result verification
“My AI agent just assembled an x402 delivery result with pay-to '0xAABBCC...' — check that against the expected merchant address '0xDDEEFF...' and tell me whether to accept or reject the delivery.”
Mismatch debugging for failed x402 payment
“An x402 payment was rejected and I think there might be an address mismatch. The challenge says pay-to is '0x999888...' but I expected '0x111222...' — can you compare them and explain what's different?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/x402-pay-to-match?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, deterministic, no-external-dependency check to confirm that an x402 challenge's pay-to address equals an expected merchant address before committing to payment or accepting agent delivery. It is ideal for pre-payment security gates in automated x402 payment flows where address spoofing or misconfiguration is a risk. Prefer it over manual string comparison because it returns structured evidence, mismatch reasons, and a versioned JSON acceptance decision suitable for audit trails.
Side effects
- Missing or empty pay_to or expected fields returns a validation error
- Addresses exceed 8192 character limit causing rejection
- Malformed or non-address strings may cause parse errors or automatic rejection
- Network timeout if the service is temporarily unavailable
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| pay_to | string | Pay To supplied to X402 Pay To Match; used only for this bounded calculation and processed in memory without retention. |
| expected | string | Expected supplied to X402 Pay To Match; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"actual": "0x1111111111111111111111111111111111111111",
"matched": true,
"expected": "0x1111111111111111111111111111111111111111"
},
"schema": "delx/util-x402-pay-to-match/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "b108f77ef3414c0bad5305e638ab373474fdd56f39a323d1bf49d6743754c925",
"external_calls": 0
},
"operation": "delivery_contract:x402_pay_to_match"
}
}Tags
x402
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