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Per-Rail x402 Fee Comparison Thresholds
x402
Per-Rail x402 Fee Comparison Thresholds is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-15).
Returns a machine-readable decision procedure for comparing x402 settlement fees across multiple blockchain rails (EVM L2, Solana, XRPL, Casper, private facilitator) before committing a payment path.
Price / call$0.002
Success—
StatusUnknown
How this service works
Machine-readable decision procedure for comparing x402 settlement fees across rails before committing a payment path. Inputs: candidate rails (EVM L2, Solana, XRPL, Casper, private facilitator), expected payment count, typical amount, and settlement window requirement. Procedure: 1) collect per-rail fee components, network fee plus facilitator fee plus token transfer fee, from the rail's published or probed schedule; 2) normalize all fees to USDC per 1000 settlements so volume differences do
Output
A JSON object containing a machine-readable decision procedure with a prose explanation ('brief'/'procedure' fields), normalized fee comparison data across candidate rails, the generation source (llm, reasoning, or deterministic), an ISO-8601 timestamp, and the service slug and provider identifier. The 'brief' field provides 120+ words of actionable guidance on which rail minimizes costs given the inputs.
Example use cases
Choosing rail for high-volume micropayments
“I'm planning to run 2000 x402 micropayments of about 0.50 USDC each over the next week — can you compare the total fees on EVM L2, Solana, and XRPL and tell me which rail gives me the best deal with same-day settlement?”
Evaluating private facilitator vs public rails
“I have a private facilitator option alongside Solana and Casper for my x402 payments — can you normalize the fees across all three for around 300 payments of 5 USDC each and show me the decision procedure for picking the cheapest path?”
One-off payment path cost check
“I need to send a single x402 payment of 50 USDC and want to know which rail — EVM L2, XRPL, or Solana — has the lowest total fee including network, facilitator, and token transfer costs for near-instant settlement.”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/per-rail-x402-fee-comparison-thresholds?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to programmatically decide which blockchain rail to route x402 payments through based on cost, before committing to a payment path. Prefer this over manual fee lookups when comparing multiple rails simultaneously with normalized per-1000-settlement metrics. Especially valuable for high-volume payment scenarios where fee differences across EVM L2, Solana, XRPL, Casper, or private facilitators materially affect total cost.
Side effects
- Missing or invalid query parameters result in incomplete fee comparison
- Rail fee schedules may be stale if the rail's published schedule has changed recently
- Private facilitator fees may not be available if not publicly probed
- Payment required (402) if 'meta=1' is not set and x402 payment header is absent
- Network congestion on candidate rails may cause fee normalization to be based on outdated probes
- Unsupported rail identifiers return an error or are silently omitted from comparison
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-x402-fee-comparison-thresholds",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "per-rail-x402-fee-comparison-thresholds",
"provider": "K-2SO"
}
}Tags
x402
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