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Agent-Side x402 Cost Evaluation and Payment Runtime Decision Procedure
x402
Agent-Side x402 Cost Evaluation and Payment Runtime Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-13).
Returns a plain-prose decision procedure brief helping AI agents evaluate whether a given x402 per-call cost is justified and how to gate payments at runtime.
Price / call$0.002
Success—
StatusUnknown
How this service works
Deterministic procedure for an agent runtime that pays x402 per request: evaluate the quote before settling. Ordered checks: parse the 402 challenge fields (amount, asset, network, timeout, scheme) before payment and reject implicit amounts, gate price against 20% of task value, track cumulative micro-payment spend against run budget with pause at 80% and hard stop at 100%, compare offers across facilitators and rails and settle cheapest that passes vetting, flag price drift above 2x, double
Output
A JSON object containing a plain-prose decision procedure brief (120+ words) advising the AI agent on how to evaluate x402 per-call costs and gate payments, along with the model used, topic, service slug, ISO-8601 generation timestamp, and generation source (llm, reasoning, or deterministic).
Example use cases
Autonomous agent payment approval gate
“My AI agent is about to pay for an x402 data service costing $0.002 USDC per call — give me the decision procedure it should run to decide whether to approve or reject the payment before committing.”
Building a cost-control policy for agent fleet
“I'm building an agent fleet on Base and need a decision procedure each agent can follow to evaluate whether per-call x402 costs are justified by the expected value — can you pull that brief for me?”
Onboarding a new x402 service integration
“We're integrating a new x402 paid API into our agent and want to know the standard cost evaluation and payment runtime procedure so the agent doesn't overspend — fetch the official decision brief for that.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/agent-side-cost-evaluation-and-payment-runtime-dWhen to prefer
Choose this endpoint when an AI agent needs a structured, plain-language decision procedure specifically for evaluating whether x402 per-request micropayments are cost-justified at runtime. It is purpose-built for autonomous agent payment gating on Base/USDC and produces a prose brief directly consumable by another agent, unlike generic cost-analysis tools or static documentation.
Side effects
- HTTP 402 returned if payment has not been settled — agent must pay exact USDC amount and retry with PAYMENT-SIGNATURE header
- Invalid or missing method enum causes request rejection
- Topic override ignored if format is invalid
- Service may return ok:false in result if the handler fails internally
- Stale or deterministic briefs may be returned depending on generation source
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": "agent-side-cost-evaluation-and-payment-runtime-d",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "agent-side-cost-evaluation-and-payment-runtime-d",
"provider": "K-2SO"
}
}Tags
x402
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