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Agent Payment Cost Verification: Advertised vs Billed Price Divergence on x402 Rails
x402
Agent Payment Cost Verification: Advertised vs Billed Price Divergence on x402 Rails is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-19).
Returns a deterministic decision procedure for detecting and handling advertised-versus-billed price divergence and per-rail fee drift before committing to x402 micropayments
Price / call$0.002
Success—
StatusUnknown
How this service works
Paid agent-facing brief on agent payment cost verification: advertised versus billed price divergence on x402 rails, per-rail fee drift detection before micropayment commitment · Build a decision procedure or schema for: agent payment cost verification: advertised versus billed price divergence on x402 rails, per-rail fee drift detection before micropayment commitment. Include inputs, thresholds, failure modes. Falsifier: I-0. Blunt decision procedure, not marketing.
Output
A JSON response containing a plain-prose decision procedure (120+ words) covering inputs required for price verification, divergence thresholds, per-rail fee drift detection logic, failure modes to handle, and a recommended abort/proceed decision tree — along with metadata including model used, generation timestamp, and generation source (llm/reasoning/deterministic).
Example use cases
Pre-payment price sanity check for autonomous agent
“My agent is about to commit to an x402 micropayment but I want it to first verify that the billed amount hasn't drifted from the advertised price — give me the step-by-step decision procedure with thresholds it should use before sending funds.”
Fee drift detection across multiple payment rails
“I'm routing agent payments across several x402 rails and I'm worried about per-rail fee drift inflating actual costs — what's the deterministic procedure for detecting that drift before each payment commitment?”
Audit trail for advertised vs actual charges
“Some of our agent micropayments are coming in slightly higher than the listed price and I need a structured decision schema to flag divergences, define acceptable tolerance ranges, and specify what failure modes to watch for.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/agent-payment-cost-verification-advertised-versu?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs a concrete, non-marketing decision procedure for verifying x402 payment cost integrity before committing funds — particularly when operating across multiple rails where per-rail fees can drift. Prefer this over generic payment documentation when you need structured thresholds, explicit failure modes, and a falsifiable abort condition baked into the output.
Side effects
- Payment required but not provided — returns 402 with payment instructions
- Topic not found or no procedure generated — ok: false with empty brief
- LLM generation failure — generationSource may fall back to deterministic stub
- Rate limiting or service unavailability — HTTP 429 or 503
- Malformed query parameters — schema validation error returned
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-payment-cost-verification-advertised-versu",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "agent-payment-cost-verification-advertised-versu",
"provider": "K-2SO"
}
}Tags
x402
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