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Live Per-Rail Fee Index for x402 Settlement Choice
x402
Live Per-Rail Fee Index for x402 Settlement Choice is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-09-14).
Returns current fee schedules across Base, Solana, MPP/Tempo, and fee-free rails (Open USD) for x402 payments, with freshness timestamps and a recommended cheapest-rail verdict.
Price / call$0.002
Success—
StatusDown
How this service works
Paid agent-facing brief on Live per-rail fee index for x402 settlement choice: current fee schedules (stablecoin transfer fee, facilitator/merchant fee, L2 gas for the rail) across Base, Solana, MPP/Tempo, and fee-free rails like Open USD, with freshness timestamps and a recommended cheapest rail verdict. Blunt decision procedure, not marketing.
Output
A paid brief containing current fee schedules for each x402 rail (Base, Solana, MPP/Tempo, Open USD) including stablecoin transfer fees, facilitator/merchant fees, and L2 gas costs, along with ISO-8601 freshness timestamps and a blunt cheapest-rail recommendation. Response includes ok/paid status flags, service slug, provider, and generation metadata.
Example use cases
Cheapest rail selection before payment
“Before my agent sends out a batch of x402 payments, can you check the live fee index and tell me which rail — Base, Solana, MPP/Tempo, or Open USD — has the lowest total cost right now including gas and facilitator fees?”
Fee audit for x402 integration
“I'm integrating x402 into my app and need a clear breakdown of current stablecoin transfer fees, facilitator fees, and L2 gas for each supported rail — can you fetch the latest fee schedule with timestamps?”
Automated rail routing decision
“My agent needs to decide which x402 settlement rail to use — can you get the live per-rail fee data and give me the blunt cheapest-rail verdict so I can route automatically?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/live-per-rail-fee-index-for-x402-settlement-choiWhen to prefer
Prefer this endpoint when an AI agent needs to make a real-time, cost-optimal routing decision for x402 payments across multiple rails and requires a single authoritative verdict rather than assembling fee data from multiple sources. Especially useful for automated payment routing pipelines where the agent cannot afford to query each rail separately. Choose alternatives if you need raw blockchain fee data without the decision layer, or if you are not using x402 as your payment protocol.
Side effects
- Payment not completed — endpoint requires $0.002 USDC x402 payment; unpaid requests return 402 Payment Required
- Stale fee data if underlying rail oracles are unavailable — freshness timestamp indicates data age
- Invalid topic override parameter results in default topic being used
- LLM generation failure returns ok:false with error detail in result
- Network timeout from k2so.wrong.systems may result in no response
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-fee-index-for-x402-settlement-choi",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "live-per-rail-fee-index-for-x402-settlement-choi",
"provider": "K-2SO"
}
}Tags
x402
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