{"uid":"cap_Gt0HSs_8KQQmmX8nXOhZ_","slug":"live-paid-response-latency-index-for-x402-and-mpp-merchants-bb0b096d","name":"Live Paid-Response Latency Index for x402 and MPP Merchants","description":"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,","url":"https://k2so.wrong.systems/api/services/live-paid-response-latency-index-x402-mpp-mercha?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"live paid-response latency index for x402 and MPP merchants paid response","$schema":"https://json-schema.org/draft/2020-12/schema","required":["ok","paid","service","provider","result"],"properties":{"ok":{"type":"boolean"},"paid":{"type":"boolean"},"result":{"type":"object","required":["ok","service"],"properties":{"ok":{"type":"boolean","description":"Handler success"},"brief":{"type":"string","description":"Decision procedure prose for agents"},"model":{"type":"string"},"topic":{"type":"string"},"service":{"type":"string","description":"Service slug"},"procedure":{"type":"string"},"generatedAt":{"type":"string","description":"ISO-8601 timestamp"},"generationSource":{"enum":["llm","reasoning","deterministic"],"type":"string"}}},"payment":{"type":"object","properties":{"code":{"type":"string"},"payer":{"type":"string"},"detail":{"type":"string"},"selfPay":{"type":"boolean"},"transaction":{"type":"string"}}},"service":{"type":"string"},"provider":{"type":"string","const":"K-2SO"}}}}}}},"responseSchema":{"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"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.002","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.002/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.002","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_sR4dE0VE-HciBSX50OGRi","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.002","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a live latency classification and pay/skip verdict for x402 and MPP merchant endpoints based on observed response times after settlement.","exampleAgentPrompt":"Check the live latency index for the Coin Flip x402 merchant — it measured 239ms response time on the base rail — and tell me whether I should pay or skip based on the latency tier.","exampleUseCases":[{"title":"Pre-payment stall-risk check for agent","prompt":"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."},{"title":"Filtering slow merchants from agent workflow","prompt":"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?"},{"title":"Latency benchmarking for merchant selection","prompt":"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?"}],"resultDescription":"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).","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T06:40:35.429Z","isFirstParty":false,"canonicalSlug":"live-paid-response-latency-index-for-x402-and-mpp-merchants-bb0b096d"}