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Deterministic Settlement Phase Procedure for x402 (K-2SO)
x402
Deterministic Settlement Phase Procedure for x402 (K-2SO) is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-30).
Returns a plain-prose decision procedure for autonomous agents navigating the settlement phase of x402 micropayment flows, generated via LLM or deterministic logic.
Price / call$0.002
Success—
StatusUnknown
How this service works
Deterministic agent-side procedure to verify a paid merchant actually delivered the promised artifact before the agent records settlement as complete. Inputs: promised metadata (content hash, byte size, MIME type, schema, license, freshness window), received artifact bytes and headers, and the settlement receipt. Checks in order: hash match against advertised digest, byte size within tolerance, MIME and schema conformance, timestamp freshness within the agreed window, license terms matching the
Output
A JSON object containing a plain-prose decision procedure (120+ words) describing how an autonomous agent should handle the x402 settlement phase, along with the topic, service slug, generation source (llm, reasoning, or deterministic), model name, and ISO-8601 timestamp of generation. The 'brief' and 'procedure' fields both carry the actionable narrative.
Example use cases
Agent wallet settlement logic builder
“My AI agent hits a 402 on Base and needs to know exactly how to settle the USDC and retry — can you get me the deterministic settlement phase procedure for x402 so I can wire it into my agent's payment logic?”
Onboarding a new x402-capable agent
“I'm building a new autonomous agent that needs to handle x402 micropayments from scratch — give me the decision procedure for the settlement phase so it knows what to do step by step after receiving a payment-required response.”
Debugging a stalled x402 payment flow
“My agent keeps failing after the 402 — it seems to be stuck in the settlement phase. Can you pull the x402 deterministic settlement procedure so I can compare it against what my agent is actually doing and find the gap?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/deterministic-settlement-phase-procedure-for-x40?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an autonomous agent needs authoritative, prose-form guidance on how to handle the settlement phase of x402 payments specifically — particularly when building, testing, or debugging agent payment logic on Base with USDC. Prefer over generic documentation when you need a machine-consumable, structured decision procedure that can be directly embedded into agent reasoning loops.
Side effects
- Payment not settled — endpoint returns HTTP 402 with PAYMENT-REQUIRED until exact USDC is paid and PAYMENT-SIGNATURE header is included in retry
- Malformed query params cause 400-level error
- topic override not recognized may return generic procedure
- LLM generation failure may fall back to deterministic source or return 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": "deterministic-settlement-phase-procedure-for-x40",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "deterministic-settlement-phase-procedure-for-x40",
"provider": "K-2SO"
}
}Tags
x402
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