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Per-Rail Settlement Fee Adjudication for Multi-Rail x402 Payments
x402
Per-Rail Settlement Fee Adjudication for Multi-Rail x402 Payments is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-17).
Generates an AI-authored decision procedure brief helping agents choose the optimal settlement rail (Base, Solana, Arbitrum, card, telco, etc.) for an x402 payment based on fees, speed, verifiability, and wallet compatibility.
Price / call$0.002
Success—
StatusUnknown
How this service works
Paid agent-facing brief on Per-rail settlement fee adjudication for multi-rail x402 payments: a decision procedure an agent runs BEFORE choosing which chain or rail settles an x402 payment (Base, Solana, Arbitrum, Casper, card-backed hosted rails, telco rails). Inputs: quoted price, per-rail fee estimates, settlement-speed expectations, receipt verifiability per rail, and payer wallet compatibility. Outputs: rail-selection verdict, fee-ceiling check, dispute-path availability per rail. This is
Output
Returns a structured JSON response containing a prose decision-procedure brief authored by an LLM or reasoning model, including: a rail-selection verdict identifying the recommended settlement rail, a fee-ceiling check result, and dispute-path availability for each candidate rail. Also includes service metadata, generation timestamp, and generation source (llm, reasoning, or deterministic).
Example use cases
Cheapest rail selection before payment
“I need to settle an x402 payment and I want to know which chain — Base, Arbitrum, or Solana — will cost me the least in fees right now, and whether any of them would exceed my 0.01 USDC fee ceiling.”
Dispute path check for high-value settlement
“Before I finalize this x402 payment, check each available rail and tell me which ones have a verifiable dispute path — I don't want to settle on a rail where I'd have no recourse if something goes wrong.”
Wallet compatibility rail routing
“My payer only has a Solana wallet — run the rail adjudication procedure and tell me whether Solana is a viable settlement option for this x402 payment given current fees and receipt verifiability, or if I should route through a card-backed hosted rail instead.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/per-rail-settlement-fee-adjudication-for-multi-r?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs a structured, reasoned decision procedure for selecting among multiple x402-compatible settlement rails before committing a payment. It is especially useful when fee ceilings, settlement speed, receipt verifiability, or payer wallet constraints vary across candidate rails (Base, Solana, Arbitrum, Casper, card-backed, telco). Prefer this over manual fee comparison when you need a single authoritative verdict plus dispute-path analysis in one call.
Side effects
- Payment required but not provided — returns 402 with payment instructions
- Invalid or missing input parameters — returns schema validation error
- LLM generation failure — ok field returns false with error detail
- Unsupported topic override — may return generic procedure instead of specialized one
- Network timeout on upstream LLM call — slow or failed 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": "per-rail-settlement-fee-adjudication-for-multi-r",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "per-rail-settlement-fee-adjudication-for-multi-r",
"provider": "K-2SO"
}
}Tags
x402
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