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Post-Settlement Price Integrity Audit for x402 Payments
x402
Post-Settlement Price Integrity Audit for x402 Payments is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-31).
Generates a decision procedure brief that audits whether USDC actually charged in an x402 payment matches the declared price, detecting quote-vs-charge drift, fee leakage, and double-charge scenarios with a disputable evidence bundle.
Price / call$0.002
Success—
StatusDown
How this service works
Paid agent-facing brief on Post-settlement price integrity audit for x402 payments: procedure that verifies the USDC actually charged to the payer matches the price declared in the 402 challenge terms, detects quote-vs-charge drift, per-rail fee leakage, and double-charge on re-probe, with an evidence bundle a payer can dispute with. · Build a decision procedure or schema for: Post-settlement price integrity audit for x402 -0. Blunt decision procedure, not marketing.
Output
A paid JSON response containing a decision procedure brief (prose and structured procedure) for auditing x402 post-settlement price integrity, including detection logic for quote-vs-charge drift, per-rail fee leakage, and double-charge on re-probe, plus an evidence bundle schema a payer can use for dispute — along with generation metadata (model, timestamp, generation source).
Example use cases
Detecting x402 quote-vs-charge drift
“I just settled an x402 payment but I think the USDC charged was higher than the price declared in the original 402 challenge — give me the audit procedure to verify if there was drift and build an evidence bundle I can use to dispute it.”
Catching double-charge on re-probe
“My agent re-probed an x402 endpoint and I'm worried it got charged twice — walk me through the decision procedure to detect a double-charge and figure out what evidence I'd need to dispute it.”
Per-rail fee leakage audit
“I want to audit whether the per-rail fees on my x402 USDC settlements are leaking beyond what was declared in the 402 terms — get me the procedure to detect that and document it.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/post-settlement-price-integrity-audit-for-x402-p?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent or developer needs a concrete, blunt decision procedure for auditing x402 payment settlement integrity — specifically verifying USDC charge accuracy, detecting drift from declared prices, or building dispute evidence. Prefer this over generic payment auditing guides when operating in the x402/Base/USDC ecosystem and needing agent-actionable logic rather than marketing material.
Side effects
- Payment not provided or insufficient USDC — returns 402 challenge requiring payment
- Invalid method (non-GET/HEAD/DELETE) — rejected by schema
- Network or provider unavailability at k2so.wrong.systems — connection failure
- LLM generation failure — result.ok may be false with no brief returned
- Invalid queryParams values — schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"paid": true,
"result": {
"ok": true,
"brief": "plain prose decision procedure (120+ words)",
"model": "deepseek/deepseek-v4-flash-0731",
"topic": "string topic",
"service": "post-settlement-price-integrity-audit-for-x402-p",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "post-settlement-price-integrity-audit-for-x402-p",
"provider": "K-2SO"
}
}Tags
x402
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