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Live Per-Rail x402 Fee Index with Corpse Detection
x402
Live Per-Rail x402 Fee Index with Corpse Detection is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-20).
Returns a paid, probe-grounded decision procedure for buyer agents on current x402 payment fees and costs across rails, including detection of dead or inactive rails.
Price / call$0.002
Success—
StatusDown
How this service works
Paid agent-facing brief on live per-rail x402 fee and cost index, probe-grounded composite for buyer agents · Build a decision procedure or schema for: live per-rail x402 fee and cost index, probe-grounded composite for buyer agents. Include inputs, thresholds, failure modes. Falsifier: If free docs already solve the decision, paid product fails.-0. Blunt decision procedure, not marketing.
Output
A JSON object containing a plain-prose decision procedure (120+ words) for choosing among x402 rails, including per-rail fee data, corpse detection results, cost composite scores, thresholds, failure modes, the model used to generate it, an ISO-8601 timestamp, and generation source (llm/reasoning/deterministic).
Example use cases
Route payment on cheapest live rail
“Before I send this x402 payment, check the live per-rail fee index and tell me which rail is cheapest right now and whether any of the options are inactive or dead.”
Audit x402 rail costs before agent deployment
“I'm about to deploy a buyer agent that will make frequent x402 payments — pull the current per-rail cost index and flag any rails with corpse signals so I can hardcode the right defaults.”
Monitor rail fee drift over time
“Fetch the latest live x402 fee composite for all rails and give me the decision procedure for when fees are too high or a rail should be dropped from consideration.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/live-per-rail-x402-fee-and-cost-index-probe-grou?utm_source=zero.xyzWhen to prefer
Choose this endpoint when a buyer agent needs current, probe-verified x402 fee data across multiple rails and cannot rely on static documentation — particularly when rail liveness is uncertain, fees are volatile, or the agent must make a cost-optimal routing decision automatically. Not needed if a single known rail is always used and fees are known to be stable.
Side effects
- Payment not made — returns 402 with payment instructions instead of result
- Rail probe data unavailable — composite may be incomplete or stale
- LLM generation failure — generationSource may fall back to deterministic with reduced quality
- Invalid topic override — procedure may be generic rather than topic-specific
- All probed rails appear dead — corpse detection returns no viable options
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": "live-per-rail-x402-fee-and-cost-index-probe-grou",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "live-per-rail-x402-fee-and-cost-index-probe-grou",
"provider": "K-2SO"
}
}Tags
x402
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