{"id":"c9cd9f4f-4307-4452-9da4-2266e226e0fb","shortId":"BRrqtt","kind":"x402","title":"Pay-per-call stock quote for MRK (Merck) via x402 on Base, settled in USDC.","tagline":"Pay-per-call stock quote for MRK (Merck) via x402 on Base, settled in USDC.","description":"This endpoint at lowpaymentfee.com provides stock data for the ticker MRK (Merck & Co.) through an x402-gated API call. Each request costs $0.02 in USDC on the Base network, with no API keys, rate limits, or subscriptions required — you simply attach an x402 payment header to a POST request and receive a JSON response.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all priced at $0.02 per request. The specific /api/v1/stocks/MRK route appears to serve stock-level data for Merck, though the exact response schema is not documented. The x402 challenge confirms the endpoint is live, accepts USDC (contract 0x8335…2913) on Base, and requires a maximum payment of 20,000 base units (i.e., $0.02 given USDC's 6 decimals).\n\nDocumentation is extremely thin — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further detail. There is no OpenAPI spec, no example responses, and no description of request parameters or response fields. Agents should expect a JSON response but will need to experiment to determine the exact payload structure.","tags":[],"capabilities":["stock-quote","per-call-payment","x402","usdc-base","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["stock price API","MRK stock data","Merck stock quote","equity data endpoint","pay-per-call stock API","x402 stock data","USDC stock API"],"warnings":["No OpenAPI spec or schema available — response format is unknown","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no content","No example responses or field descriptions for the /api/v1/stocks/MRK endpoint","The specific stock endpoint is not listed on the homepage; it may be undocumented or experimental"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/MRK","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no example request/response, and no description of what fields the stock endpoint actually returns. Effectively a stub 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'0.02':56,120,170 '000':166 '0x8335':155 '20':165 '2913':156 '6':174 'MRK stock data' 'Merck stock quote' 'USDC stock API' 'accept':152 'agent':214 'ai/ml':109 'analyt':108 'api':51,65,105,184 'appear':127 'attach':74 'base':13,29,61,158,167 'broader':94 'call':4,20,52,104 'challeng':146 'co':45 'confirm':147 'connect':190 'contract':154 'cost':55 'data':39,107,113,133 'decim':175 'descript':207 'detail':196 'determin':226 'doc':181 'document':143,176 'dozen':99 'endpoint':34,89,149 'equity data endpoint' 'exact':138,228 'exampl':203 'expect':216 'experi':224 'extrem':178 'field':213 'finance/crypto':111 'gate':50 'given':171 'header':78 'i.e':169 'infer':110 'json':86,218 'key':66 'level':132 'limit':68 'live':151 'lowpaymentfee.com':36,96 'market':112 'maximum':162 'merck':9,25,44,135 'mrk':8,24,43 'need':222 'network':62 'no-api-key' 'no-rate-limit' 'offer':98 'openapi':200 'page':185 'paramet':210 'part':91 'pay':2,18,102 'pay-per-cal':1,17,101 'pay-per-call stock API' 'payload':229 'payment':77,163 'per':3,19,103,121 'per-call-payment' 'platform':95 'post':81 'price':118,182 'prompt':192 'provid':37 'quot':6,22 'rate':67 'receiv':84 'render':187 'request':54,82,122,209 'requir':71,160 'respons':87,139,204,212,219 'rout':126 'schema':140 'serv':129 'servic':116 'settl':14,30 'simpli':73 'span':106 'spec':201 'specif':124 'stock':5,21,38,131 'stock price API' 'stock-level':130 'stock-quote' 'structur':230 'subscript':70 'thin':179 'though':136 'ticker':42 'unit':168 'usdc':16,32,58,153,172 'usdc-base' 'util':115 'via':10,26 'wallet':191 'x402':11,27,49,76,145 'x402 stock data' 'x402-gated':48","prices":[{"id":"5dc90e38-d941-46fa-9e10-2eb2f75e822e","listingId":"c9cd9f4f-4307-4452-9da4-2266e226e0fb","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:48.516Z"}],"sources":[{"listingId":"c9cd9f4f-4307-4452-9da4-2266e226e0fb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/MRK","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:48.516Z","lastSeenAt":"2026-04-23T20:01:23.720Z"}],"details":{"listingId":"c9cd9f4f-4307-4452-9da4-2266e226e0fb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/MRK \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/stocks/MRK"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, API, and README pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching current or recent stock data for Merck (MRK) in an automated trading or research pipeline","Agents that need on-demand equity information without managing API keys or subscriptions","Integrating stock lookups into LLM-based financial assistants with micropayment settlement"],"bestFor":["AI agents needing keyless, pay-per-call stock data","Developers prototyping financial tools who want zero-commitment API access","Crypto-native workflows that can settle payments in USDC on Base"],"notFor":["High-frequency trading requiring sub-millisecond latency and bulk data","Users who need comprehensive historical stock data or full market coverage","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:46:55.61Z"},"updatedAt":"2026-04-23T20:01:23.720Z"}}