{"id":"65f22857-40d7-4561-8409-189e2350b532","shortId":"KzDDgV","kind":"x402","title":"Historical stock data for MRK (Merck) via x402 micropayment on Base, $0.02/request.","tagline":"Historical stock data for MRK (Merck) via x402 micropayment on Base, $0.02/request.","description":"This endpoint provides historical stock price data for Merck & Co. (ticker: MRK) through the lowpaymentfee.com platform. It is part of a broader suite of pay-per-request APIs covering finance, AI/ML, data analytics, and infrastructure utilities. Payment is handled via the x402 protocol on the Base network using USDC, with each request costing $0.02 (20,000 base units of USDC with 6 decimals).\n\nThe endpoint accepts POST requests and returns JSON. No API keys or account registration are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The platform advertises no rate limits and instant access. The x402 challenge was confirmed live, returning a proper 402 response with payment parameters including the USDC contract address on Base (0x8335…2913) and a 300-second payment timeout.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what fields the historical stock data response contains (e.g., OHLCV candles, date ranges, supported query parameters). The endpoint path suggests it returns historical price data for the MRK ticker, but the exact schema and capabilities must be inferred.","tags":[],"capabilities":["stock-history","historical-prices","x402-payment","usdc-base","pay-per-request","no-api-key","merck-mrk"],"categories":["finance","data"],"synonyms":["stock price history","MRK historical data","Merck stock API","equity price data","stock market history","x402 stock API","micropayment stock data"],"warnings":["No API documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","No OpenAPI or JSON schema provided for request or response bodies.","Response format and supported query parameters (date range, interval, etc.) are unknown.","This endpoint is specific to ticker MRK; coverage of other tickers is not confirmed at this path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/MRK/history","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/stocks/MRK/history","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 x402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The actual data format, supported query parameters, and response fields are entirely 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'0.02':12,25,81 '000':83 '0x8335':151 '20':82 '2913':152 '300':155 '402':139 '6':89 'MRK historical data' 'Merck stock API' 'accept':93 'access':129 'account':103 'address':148 'advertis':123 'ai/ml':58 'analyt':60 'api':55,100,165 'attach':109 'base':11,24,73,84,150 'broader':48 'caller':107 'candl':203 'capabl':227 'challeng':132 'co':36 'confirm':134 'connect':174 'contain':200 'content':180 'contract':147 'cost':80 'cover':56 'data':3,16,33,59,198,217 'date':204 'decim':90 'descript':191 'doc':164 'document':159 'e.g':201 'endpoint':28,92,210 'equity price data' 'exact':224 'exampl':188 'extrem':161 'field':194 'financ':57 'handl':66 'header':114 'histor':1,14,30,196,215 'historical-prices' 'includ':144 'infer':230 'infrastructur':62 'instant':128 'json':98 'key':101 'limit':126 'live':135 'lowpaymentfee.com':41 'merck':6,19,35 'merck-mrk' 'micropay':9,22 'micropayment stock data' 'mrk':5,18,38,220 'must':228 'network':74 'no-api-key' 'ohlcv':202 'openapi':184 'page':169 'paramet':143,208 'part':45 'path':211 'pay':52 'pay-per-request':51 'payment':64,113,119,142,157 'per':53 'platform':42,122 'post':94 'price':32,166,216 'prompt':176 'proof':120 'proper':138 'protocol':70 'provid':29 'queri':207 'rang':205 'rate':125 'readm':168 'registr':104 'request':54,79,95 'request/response':187 'requir':106 'respons':140,199 'return':97,136,171,214 'schema':185,225 'second':156 'simpli':108 'spars':162 'stock':2,15,31,197 'stock market history' 'stock price history' 'stock-history' 'substant':179 'suggest':212 'suit':49 'support':206 'ticker':37,221 'timeout':158 'unit':85 'usdc':76,87,146 'usdc-base' 'use':75 'util':63 'valid':117 'via':7,20,67 'wallet':175 'x':112 'x-payment':111 'x402':8,21,69,118,131 'x402 stock API' 'x402-payment'","prices":[{"id":"33e6a151-a626-45ba-a5bf-4fabc05c074a","listingId":"65f22857-40d7-4561-8409-189e2350b532","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/stocks/MRK/history","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:23.998Z"}],"sources":[{"listingId":"65f22857-40d7-4561-8409-189e2350b532","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/MRK/history","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:23.998Z","lastSeenAt":"2026-04-29T10:34:25.219Z"}],"details":{"listingId":"65f22857-40d7-4561-8409-189e2350b532","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/MRK/history \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base network, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/stocks/MRK/history"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stocks/MRK/history"},{"claim":"Docs, API, pricing, and README pages contain only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving historical stock price data for Merck (MRK) for backtesting or analysis","Integrating stock history into an AI agent workflow without API key management","Pay-per-call access to financial data without subscriptions"],"bestFor":["Agents needing on-demand stock history without account setup","Low-volume or sporadic financial data lookups","Developers prototyping with x402 micropayment rails"],"notFor":["High-frequency trading requiring sub-second latency and guaranteed SLAs","Bulk historical data downloads across many tickers (only MRK endpoint documented here)","Users who need detailed API documentation or schema guarantees before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.063Z"},"updatedAt":"2026-04-29T10:34:25.219Z"}}