{"id":"215619ae-097e-44bc-9b33-72c913aae572","shortId":"Ly6unW","kind":"x402","title":"Pay-per-call stock data for SPGI via x402 on Base, settled in USDC at $0.02/request.","tagline":"Pay-per-call stock data for SPGI via x402 on Base, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides stock data for S&P Global Inc. (ticker: SPGI) through an x402 payment-gated API. Each request costs $0.02, paid in USDC on the Base network. The endpoint uses the x402 \"exact\" payment scheme, meaning the caller attaches a single micropayment per request with no subscription or API key required.\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/SPGI route is not listed on the homepage's catalog but follows the same x402 pattern and pricing tier as the other endpoints.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no example request/response payloads, and no description of what fields the stock data response contains. The endpoint accepts POST requests and returns application/json, but the exact input parameters and output structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","stock-data","per-call-micropayment","no-api-key","pay-per-use"],"categories":["finance","data"],"synonyms":["SPGI stock API","S&P Global stock data","stock quote API","x402 stock endpoint","micropayment stock data","Base USDC stock API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all return only a wallet-connect prompt","No OpenAPI or output schema provided; response format is entirely unknown","The /api/v1/stocks/SPGI endpoint is not listed in the homepage catalog — it may be undocumented or experimental","Cannot verify what stock data fields are returned or how current the data is"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/SPGI","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/SPGI","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and the docs pages are empty. The specific /stocks/SPGI route isn't even listed on the homepage catalog, making it unclear what data it actually 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'/api/v1/stocks/spgi':130 '/docs':159 '/pricing':161 '/readme':163 '/request':18,36 '0.02':17,35,61,125 'Base USDC stock API' 'S&P Global stock data' 'SPGI stock API' 'accept':198 'ai/ml':114 'analyt':113 'api':57,90,110 'application/json':203 'attach':80 'base':12,30,67 'broader':99 'call':4,22,109 'caller':79 'catalog':139 'connect':169 'contain':195 'content':175 'cost':60 'crawl':158 'data':6,24,43,112,118,193 'descript':187 'document':153 'dozen':104 'endpoint':38,70,94,152,197 'exact':74,206 'exampl':182 'extrem':155 'field':190 'finance/crypto':116 'follow':141 'gate':56 'global':47 'homepag':137 'inc':48 'infer':115 'input':207 'key':91 'list':134 'lowpaymentfee.com':40,101 'market':117 'mean':77 'micropay':83 'micropayment stock data' 'network':68 'no-api-key' 'offer':103 'openapi':179 'output':210 'p':46 'page':164 'paid':62 'paramet':208 'part':96 'pattern':145 'pay':2,20,107 'pay-per-cal':1,19,106 'pay-per-use' 'payload':184 'payment':55,75 'payment-g':54 'per':3,21,84,108,126 'per-call-micropayment' 'platform':100 'post':199 'price':123,147 'prompt':171 'provid':41 'request':59,85,127,200 'request/response':183 'requir':92 'respons':194 'return':166,202 'rout':131 'schema':180 'scheme':76 'servic':121 'settl':13,31 'singl':82 'span':111 'spars':156 'specif':129 'spgi':8,26,50 'stock':5,23,42,192 'stock quote API' 'stock-data' 'structur':211 'subscript':88 'substant':174 'ticker':49 'tier':148 'unknown':213 'usdc':15,33,64 'usdc-base' 'use':71 'util':120 'via':9,27 'wallet':170 'x402':10,28,53,73,144 'x402 stock endpoint' 'x402-payment'","prices":[{"id":"361ce490-fcf1-4b1b-a3f3-1bad387d2512","listingId":"215619ae-097e-44bc-9b33-72c913aae572","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/SPGI","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:06.644Z"}],"sources":[{"listingId":"215619ae-097e-44bc-9b33-72c913aae572","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/SPGI","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:06.644Z","lastSeenAt":"2026-04-29T17:04:31.091Z"}],"details":{"listingId":"215619ae-097e-44bc-9b33-72c913aae572","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/SPGI \\\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 x402 challenge requesting 20000 base units of USDC (0x8335…) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/stocks/SPGI"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The homepage lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories but does not list a /stocks endpoint","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving current or recent stock data for S&P Global (SPGI) without needing an API key or subscription","Agent-driven portfolio monitoring that pays per data fetch in USDC on Base","Integrating stock lookups into automated trading or research pipelines using x402 micropayments"],"bestFor":["Developers or agents who want keyless, pay-per-call stock data","x402-native workflows that settle payments on Base in USDC","Low-volume or sporadic stock data lookups where subscriptions are overkill"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need comprehensive market data across many tickers in bulk (only SPGI path documented here)","Anyone requiring detailed API documentation or guaranteed schema stability"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.695Z"},"updatedAt":"2026-04-29T17:04:31.091Z"}}