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SameDayDesk Payment Offer Preflight
x402
SameDayDesk Payment Offer Preflight is a paid API for AI agents from agents.samedaydesk.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).
Compares x402 and MPP payment challenges before authorization, returning normalized terms, binding checks, parity analysis, and a bounded payment decision for a given target URL.
Price / call$0.005
Success—
StatusUnknown
How this service works
Compare x402 and MPP challenges before authorization and return normalized terms, binding checks, parity, and a bounded decision. The workflow-safe POST form accepts the target URL in a JSON body.
Output
Returns a structured JSON object containing: normalized payment terms from both x402 and MPP challenges, binding checks (whether each challenge meets required constraints), a parity assessment (whether both protocols agree on amount and conditions), and a bounded decision (go/no-go recommendation for authorization). No funds are moved; this is a read-only preflight analysis.
Example use cases
Preflight before agent pays paywalled API
“Before my agent pays for access to that paywalled data endpoint at https://api.example.com/reports/q4, run a preflight on it — check the x402 and MPP challenges, confirm the terms match up, and tell me if it's safe to authorize.”
Detecting protocol parity mismatch
“I'm worried the x402 and MPP payment offers for https://partner.example.com/data-feed aren't asking for the same amount — can you do a preflight comparison and flag any parity issues before I let my agent proceed?”
Automated payment safety gate in workflow
“Every time my workflow is about to make a payment, I want it to preflight-check the target URL first — run the payment offer preflight on https://agents.samedaydesk.com/commerce/premium-snapshot and only approve if the bounded decision comes back safe.”
Technical details
Endpoint
GEThttps://agents.samedaydesk.com/commerce/payment-offer-preflightWhen to prefer
Use this endpoint when an AI agent needs to safely inspect and compare payment challenges (x402 and/or MPP) before committing funds for a target URL. It is the right choice when you want a normalized, protocol-agnostic view of payment terms and an automated parity/binding check — especially in agentic workflows where an automated payment gate is needed before any real authorization occurs. Prefer this over directly parsing raw challenge headers when you need a structured, human-readable comparison and a concrete go/no-go recommendation.
Side effects
- Target URL is unreachable or returns no payment challenge — endpoint returns an error indicating no challenge found
- URL returns a malformed or non-standard x402/MPP challenge — normalization may fail with a parse error
- Parity check fails because x402 and MPP terms differ significantly — returned as a parity mismatch in the decision object
- Invalid or missing target URL in the JSON body — likely a 400 bad request
- Target URL requires authentication that the preflight cannot supply — challenge may be incomplete
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"offers": [
{
"valid": true,
"intent": "exact",
"scheme": "exact",
"network": "eip155:8453",
"protocol": "x402",
"amountAtomic": "20000"
}
],
"parity": {
"compared": true,
"consistent": true,
"driftFields": []
},
"target": {
"url": "https://agents.samedaydesk.com/defi/morpho-position?address=0x8ee9c15c3e5332cbc6ef39a2bb036c63c6549b6e",
"method": "GET",
"httpStatus": 402
},
"product": "samedaydesk-payment-offer-preflight",
"version": "1.2.0",
"boundary": {
"paymentSent": false,
"paymentSigned": false,
"credentialsUsed": false,
"redirectsFollowed": false,
"openApiDocumentRead": true,
"targetResponseBodyRead": false
},
"decision": "parseable_offer",
"findings": [],
"checkedAt": "2026-08-10T20:00:00.000Z",
"protocols": [
"mpp",
"x402"
],
"offerCount": 2,
"catalogCoherence": [],
"responseContract": {
"decision": "admissible",
"exampleStatus": "structurally_consistent",
"requiredPaths": [
"ok",
"title",
"url"
],
"requiredFields": [
"ok",
"title",
"url"
],
"runtimeResponseVerified": false
},
"responseContractAcquisition": {
"path": "/openapi.json",
"maxBytes": 1000000,
"attempted": true,
"sameOrigin": true,
"documentRead": true,
"credentialsUsed": false,
"redirectsFollowed": false,
"targetResponseBodyRead": false
}
}
}Tags
x402
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