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Live Paid-Response Latency Index for x402 and MPP Merchants
x402
Live Paid-Response Latency Index for x402 and MPP Merchants 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 live latency classification and pay/skip verdict for x402 and MPP merchant endpoints based on observed response times after settlement.
Price / call$0.002
Success—
StatusUnknown
How this service works
Live latency index: how fast x402 and MPP merchants answer after settlement. Agent input: merchant endpoint, rail, measured response time, sample timestamp. Latency tiers: fast <200ms, normal 200-500ms, slow 500-1000ms, stall-risk >1000ms with pay/skip verdict per tier. Includes observed 2026-08 cluster from probe sweep: Riddle Oracle 183ms, Useless Fact 194ms, Random Fact 217ms, Dice Roller 224ms, Coin Flip 239ms, paysponge 253ms, TrialBase 252ms, loyalspark 279ms, Meme Generator 291ms,
Output
Returns a JSON object containing an 'ok' boolean, payment confirmation, a plain-prose decision procedure (120+ words) classifying the merchant's latency tier (fast <200ms, normal 200-500ms, slow 500-1000ms, stall-risk >1000ms) and a pay/skip verdict, plus metadata including model used, generation timestamp, and generation source (deterministic/llm/reasoning).
Example use cases
Pre-payment stall-risk check for agent
“Before I commit payment to the Riddle Oracle merchant on the x402 rail, look up its latency tier — it measured about 183ms last probe — and give me a pay or skip verdict.”
Filtering slow merchants from agent workflow
“I'm building a pipeline that calls multiple x402 services. Can you pull the latency index for paysponge at 253ms and TrialBase at 252ms on MPP rails and flag any that are stall-risk so I can skip them?”
Latency benchmarking for merchant selection
“Compare the latency tiers for Meme Generator at 291ms and loyalspark at 279ms on the x402 rail — which one falls into a better latency class and which should I prefer for low-latency agent tasks?”
Technical details
Endpoint
GEThttps://k2so.wrong.systems/api/services/live-paid-response-latency-index-x402-mpp-mercha?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs to decide whether to pay a specific x402 or MPP merchant based on observed post-settlement response latency. It is especially useful in automated pipelines where stall-risk merchants would cause timeouts or workflow failures, and when you have a measured response time from a recent probe to classify. Prefer this over generic uptime monitors because it is scoped specifically to x402/MPP settlement latency with actionable pay/skip verdicts.
Side effects
- Missing required input fields returns a validation error
- Unknown merchant endpoint may produce a generic or low-confidence latency classification
- Payment of $0.002 USDC required — unpaid requests return 402 Payment Required
- Stale probe data may not reflect current merchant performance
- Rail parameter mismatch may return irrelevant latency tier
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-paid-response-latency-index-x402-mpp-mercha",
"procedure": "same as brief",
"generatedAt": "2026-01-01T00:00:00.000Z",
"generationSource": "deterministic"
},
"service": "live-paid-response-latency-index-x402-mpp-mercha",
"provider": "K-2SO"
}
}Tags
x402
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