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x402 No-Payment-Terms Decision Procedure
x402
x402 No-Payment-Terms Decision Procedure is a paid API for AI agents from k2so-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-15).
Returns an agent-facing decision procedure for handling x402 endpoints that return no payment terms (no 402 challenge, HTTP 404/405, or weak merchant contract).
Price / call$0.002
Success—
StatusUnknown
How this service works
Decision procedure for when an x402 endpoint returns no payment terms: no 402 challenge, HTTP 404/405, or a weak merchant contract. Covers probe interpretation, knock-or-backoff thresholds, alternate rail fallback, retry budgets, and kill criteria, ending in a single verdict.
Output
A structured response containing decision procedure prose (brief) tailored for AI agents, covering probe interpretation, knock-or-backoff thresholds, alternate rail fallback strategies, retry budgets, and kill criteria — ending in a single actionable verdict. Also includes metadata like model used, topic, generation source, and timestamp.
Example use cases
Silent 404 from x402 endpoint
“I sent a GET to an x402-protected endpoint and got a 404 with no payment terms at all — give me the full decision procedure on whether to retry, switch rails, or abandon.”
Weak merchant contract triage
“My agent received a response from an x402 endpoint but the merchant contract looks incomplete or malformed — walk me through the decision procedure for handling a weak merchant contract, including retry budgets and kill criteria.”
Alternate rail fallback after probe failure
“My agent probed an x402 endpoint with a HEAD request and got no 402 response. What's the knock-or-backoff threshold I should use, and when should I fall back to an alternate payment rail?”
Technical details
Endpoint
GEThttps://k2so-8080.on.ascii.dev/api/services/agent-facing-decision-procedure-for-x402-endpoin?utm_source=zero.xyzWhen to prefer
Choose this endpoint when your agent has encountered an x402 endpoint that did not return a standard 402 payment challenge — specifically when you need a structured, agent-optimized decision procedure covering probe logic, retry/backoff thresholds, alternate rail fallback, and kill criteria. Prefer this over generic x402 documentation when you need a single actionable verdict rather than reference material.
Side effects
- Endpoint returns HTTP 404 if the service slug or path is wrong
- Payment not processed correctly results in unpaid response without procedure content
- LLM generation failure may result in ok:false with no brief
- Invalid method (non-GET/HEAD/DELETE) rejected by schema validation
- Malformed input object causes request rejection
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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