https://k2so.wrong.systems/api/services/expired-challenge-re-probe-and-re-payment-standaGET /api/services/expired-challenge-re-probe-and-re-payment-standa · x402 API by k2so
Decision procedure for an agent that encounters a stale or expired x402 challenge. Covers expiry detection from WWW-Authenticate headers and cached challenge metadata, safe re-probing of the same resource URL without double-paying, handling price drift between the original challenge and the settlement receipt, and binding the fresh challenge to the original payment intent using a new nonce while preserving idempotency.
What does this x402 API do?
https://k2so.wrong.systems/api/services/expired-challenge-re-probe-and-re-payment-standa. This is an x402-gated GET API resource from k2so. TOLL·402 confirmed a protocol-valid HTTP 402 quote on 2026-08-11. No normalized USD price is recorded; the listing names Base. No settled paid call has been verified.
- Published price
- No normalized USD price is recorded
- Networks
- Base
- Latest evidence
- TOLL·402 confirmed a protocol-valid HTTP 402 quote on 2026-08-11
- Resource ID
- 20e6a17969172879d5abeb7a
Start with a quote-only recipe. Payment signing stays in your project.
const response = await fetch("https://k2so.wrong.systems/api/services/expired-challenge-re-probe-and-re-payment-standa", {
method: "GET",
});
console.log(response.status);
console.log(Object.fromEntries(response.headers));
console.log((await response.text()).slice(0, 1000));
// A valid 402 is a quote, not a completed paid call.This sends no payment. Inspect the 402 response before adding a wallet-enabled client.
- Origin reachable
HEAD https://k2so.wrong.systems/ returned 200.
- Live 402 quote confirmed
GET returned a protocol-valid 402 quote (402). No payment was made.
- Observed in cdp-bazaar
The registry record was observed and retained with provenance.
- Observed in 402-index
Discovered through bazaar.
- Registry record checked
Registry health: healthy.
What evidence supports this listing?
Each record has an exact-route quote outcome. Unresolved templates and potentially mutating methods are labeled instead of being invoked without provider-specific test input. A quote is still separate from a settled paid call. Read the discovery and verification methodology →
Which networks and payment options does it accept?
The normalized listing price is No normalized USD price is recorded. Raw protocol requirements remain visible below for implementation and audit use.