{"uid":"cap_7GPNlxJfhepMqZoygNVlw","slug":"live-advertised-vs-billed-price-divergence-index-for-x402-merchants-c12e0a23","name":"Live Advertised-vs-Billed Price Divergence Index for x402 Merchants","description":"Live price-honesty index: which x402 merchants advertise one price in the 402 challenge and bill a different amount after settlement. Agent input: challenge price, billed amount, merchant id. Output: divergence ratio, severity class (soft flag >= 1.5x, hard flag >= 3x, no-pay >= 10x), pay/skip verdict, evidence row. Includes the observed 2026-08 cluster: Meme Generator, Useless Fact, Coin Flip, Riddle Oracle advertising 0.001 to 0.002 but billing 0.01, and onesource.io block-number billing 2x","url":"https://k2so.wrong.systems/api/services/live-advertised-vs-billed-price-divergence-index?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","properties":{"meta":{"enum":["0","1"],"type":"string","description":"Set to 1 for free metadata JSON (no payment required)"},"topic":{"type":"string","description":"Optional topic override for the decision procedure"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object","title":"live advertised-vs-billed price divergence index for x402 merchants paid response","$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-advertised-vs-billed-price-divergence-index","procedure":"same as brief","generatedAt":"2026-01-01T00:00:00.000Z","generationSource":"deterministic"},"service":"live-advertised-vs-billed-price-divergence-index","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":"down","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_WkBXgtL4xtxxObEpGQ0nr","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 price-honesty index showing whether x402 merchants bill a different amount than they advertised in their HTTP 402 challenge, including a divergence ratio, severity classification, and pay/skip verdict.","exampleAgentPrompt":"Before I pay this x402 merchant, check if there's a price divergence — they advertised 0.001 USDC in the 402 challenge but billed 0.01 USDC after settlement. The merchant ID is meme-generator-001. Is this a hard flag or should I skip payment?","exampleUseCases":[{"title":"Skip overbilling x402 merchant","prompt":"I'm about to settle an x402 payment for merchant coin-flip-service, but they advertised 0.001 USDC in the challenge and are now billing me 0.01 USDC. Can you check the divergence ratio and tell me if I should pay or skip?"},{"title":"Audit new x402 listing before first pay","prompt":"I found a new x402 service called riddle-oracle that shows 0.002 USDC in the 402 challenge. Before I send any money, can you tell me if this merchant has a history of billing a different amount than advertised and what severity class it falls under?"},{"title":"Investigate block-number billing anomaly","prompt":"I noticed onesource.io billed me twice the challenge price on my last x402 payment. Can you pull the divergence index for merchant onesource-io, compare the advertised price of 0.005 USDC to the billed amount of 0.01 USDC, and give me a verdict?"}],"resultDescription":"A JSON object containing a divergence ratio (billed/advertised), a severity class label (none, soft-flag ≥1.5x, hard-flag ≥3x, or no-pay ≥10x), a pay/skip verdict for the agent, an evidence row with transaction details, and a plain-prose decision procedure (brief) explaining the reasoning — all generated deterministically or via LLM reasoning and timestamped.","failureModes":["Missing or invalid merchant ID returns an error or empty result","If challenge price or billed amount is not provided, the procedure may fall back to topic-level heuristics only","LLM-generated briefs may vary in wording but deterministic severity classes remain stable","Unknown merchants with no observed billing history may return inconclusive verdicts","Rate limiting or payment verification failure may block the paid response"],"whenToPreferThis":"Use this endpoint when an AI agent needs to verify price integrity for a specific x402 merchant before or after settlement — especially when the challenge price differs from the settlement amount. Prefer this over generic merchant lookup services when you need x402-specific severity classification (soft/hard/no-pay thresholds) and an actionable pay/skip verdict grounded in observed billing clusters from 2026.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-19T15:28:30.200Z","isFirstParty":false,"canonicalSlug":"live-advertised-vs-billed-price-divergence-index-for-x402-merchants-c12e0a23"}