{"id":"1ce32ece-e4a7-4681-adf3-7bf830a1c67b","shortId":"a5PEX5","kind":"x402","title":"Stock market quote for MRK via x402 micropayment on Base, $0.02 per request in USDC.","tagline":"Stock market quote for MRK via x402 micropayment on Base, $0.02 per request in USDC.","description":"This endpoint provides a market quote for the ticker symbol MRK (Merck & Co.) through an x402-enabled pay-per-call API hosted at lowpaymentfee.com. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, rate limits, or subscriptions are required — each call is individually paid via the x402 protocol's X-PAYMENT header.\n\nThe provider site lowpaymentfee.com offers a broad catalog of x402-gated endpoints spanning finance, AI/ML, data analytics, and utility services, all priced uniformly at $0.02 per request. This specific endpoint falls under the Finance & Web3 category. The site's documentation pages were largely empty at crawl time (showing only a \"Connect wallet\" prompt), so detailed request/response schemas, field definitions, and example payloads are not available. The endpoint is confirmed live: it returns a proper 402 challenge with x402Version 1 and an \"exact\" payment scheme.\n\nBecause no OpenAPI spec, request body schema, or sample response was found, consumers should expect to experiment with the POST body to determine required parameters (e.g., whether additional fields beyond the ticker in the URL path are needed). The lack of documentation is a notable gap.","tags":[],"capabilities":["stock-market-quote","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","json-response"],"categories":["finance","market-data"],"synonyms":["MRK stock quote","Merck quote API","market data API","stock price endpoint","equity quote","x402 finance API","micropayment stock data"],"warnings":["No OpenAPI or schema documentation available — request body format and response fields are unknown.","Documentation pages (/docs, /api, /pricing, /README) all returned only a 'Connect wallet' prompt with no useful content.","The exact data source, freshness, and fields returned in the market quote are unverified.","The provider site lists many endpoints across diverse categories (AI, analytics, finance, utilities) all at the same price, which may indicate a demo or early-stage service."],"endpointUrl":"https://lowpaymentfee.com/api/v1/market/quote/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/market/quote/MRK","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 with a valid 402 challenge and clear pricing, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no example payloads. The listing is largely inferred from the URL path and the x402 challenge 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'000':85 '0x8335':75 '1':193 '20':84 '2913':76 '402':189 '6':89 'MRK stock quote' 'Merck quote API' 'accept':59 'addit':226 'ai/ml':129 'analyt':131 'api':53,92 'avail':179 'base':10,25,70,86 'base-network' 'beyond':228 'bodi':204,219 'broad':120 'call':52,101 'catalog':121 'categori':150 'challeng':190 'co':43 'confirm':183 'connect':165 'consum':211 'contract':74 'cost':79 'crawl':160 'data':130 'decim':90 'definit':173 'detail':169 'determin':221 'document':154,240 'e.g':224 'empti':158 'enabl':48 'endpoint':32,58,126,144,181 'equity quote' 'exact':196 'exampl':175 'expect':213 'experi':215 'fall':145 'field':172,227 'financ':128,148 'found':210 'gap':244 'gate':125 'header':113 'host':54 'individu':103 'json':64 'json-response' 'key':93 'lack':238 'larg':157 'limit':95 'live':184 'lowpaymentfee.com':56,117 'market':2,17,35 'market data API' 'merck':42 'micropay':8,23 'micropayment stock data' 'mrk':5,20,41 'need':236 'network':71 'no-api-key' 'notabl':243 'offer':118 'openapi':201 'page':155 'paid':104 'paramet':223 'path':234 'pay':50 'pay-per-cal':49 'pay-per-call' 'payload':176 'payment':65,112,197 'per':12,27,51,82,140 'post':60,218 'price':136 'prompt':167 'proper':188 'protocol':108 'provid':33,115 'quot':3,18,36 'rate':94 'request':13,28,61,83,141,203 'request/response':170 'requir':99,222 'respons':208 'return':63,186 'sampl':207 'schema':171,205 'scheme':198 'servic':134 'settl':67 'show':162 'site':116,152 'span':127 'spec':202 'specif':143 'stock':1,16 'stock price endpoint' 'stock-market-quote' 'subscript':97 'symbol':40 'ticker':39,230 'time':161 'uniform':137 'unit':87 'url':233 'usdc':15,30,73 'usdc-settlement' 'use':72 'util':133 'via':6,21,105 'wallet':166 'web3':149 'whether':225 'x':111 'x-payment':110 'x402':7,22,47,107,124 'x402 finance API' 'x402-enabled':46 'x402-gated':123 'x402-payment' 'x402version':192","prices":[{"id":"6cdc6668-30af-4cb2-a62f-f68374479a0c","listingId":"1ce32ece-e4a7-4681-adf3-7bf830a1c67b","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/market/quote/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":"2026-04-18T18:34:33.486Z"}],"sources":[{"listingId":"1ce32ece-e4a7-4681-adf3-7bf830a1c67b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/market/quote/MRK","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:33.486Z","lastSeenAt":"2026-04-22T08:30:35.879Z"}],"details":{"listingId":"1ce32ece-e4a7-4681-adf3-7bf830a1c67b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/market/quote/MRK \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402Version 1, exact scheme, on Base network, asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC), maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/market/quote/MRK"},{"claim":"Provider advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists finance endpoints including /api/v1/finance/prices, /api/v1/crypto/quotes, and others at $0.02 each","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching a real-time or recent market quote for Merck (MRK) in an automated trading or research pipeline","Agent-driven portfolio monitoring that pays per data request without managing API keys","Integrating stock quote data into a Web3 application that already settles on Base"],"bestFor":["Developers wanting key-less, pay-per-call access to MRK market data","AI agents that can settle USDC micropayments on Base autonomously","Prototyping financial dashboards without subscription commitments"],"notFor":["High-frequency trading requiring sub-millisecond latency and bulk data feeds","Users who need comprehensive historical OHLCV data or full market depth","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:31:32.605Z"},"updatedAt":"2026-04-22T08:30:35.879Z"}}