{"id":"875362b1-b183-4242-8849-f8b3c2f71be0","shortId":"XZqwXS","kind":"x402","title":"Pay-per-call stock quote API for COIN, settled in USDC on Base via x402.","tagline":"Pay-per-call stock quote API for COIN, settled in USDC on Base via x402.","description":"This endpoint at lowpaymentfee.com provides stock data for the ticker COIN (Coinbase Global) via a simple POST request, paid per-call using the x402 protocol. Each request costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The payment is settled on-chain to a specified wallet address.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-request APIs spanning data analytics, AI/ML inference, finance/crypto market data, and utility services, all at the same $0.02/request price point. The specific endpoint probed here (`/api/v1/stocks/COIN`) is not listed on the homepage's catalog, but it follows the same x402 payment pattern and pricing as the other endpoints.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no example request/response payloads, and no description of what fields the stock data response contains. The endpoint is confirmed live (returns a valid x402 402 challenge), but without documentation or sample responses, the exact shape of the returned data is unknown.","tags":[],"capabilities":["stock-quote","per-call-payment","x402-protocol","usdc-settlement","base-network","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["stock price API","COIN stock data","Coinbase stock quote","pay-per-call stock API","x402 stock endpoint","crypto stock data","USDC micropayment API"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content","No OpenAPI or response schema provided; the shape of the stock data response is unknown","The /api/v1/stocks/COIN endpoint is not listed in the provider's homepage API catalog","Cannot verify what data fields are returned or how current the stock data is"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/COIN","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/COIN","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 x402 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI schema, no example requests or responses, and no description of the response payload. The specific /stocks/COIN path isn't even listed on the provider's homepage catalog. This is effectively a stub 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'/request':125 '0.02':62,124 '402':206 'COIN stock data' 'Coinbase stock quote' 'USDC micropayment API' 'address':90 'ai/ml':112 'analyt':111 'api':7,23,70,108,164 'base':14,30,67 'base-network' 'broader':97 'call':4,20,54 'catalog':141 'chain':85 'challeng':207 'coin':9,25,43 'coinbas':44 'confirm':200 'connect':170 'contain':196 'content':176 'cost':61 'crypto stock data' 'data':39,110,116,194,220 'descript':188 'doc':161 'document':156,210 'dozen':102 'endpoint':34,92,130,155,198 'exact':215 'exampl':183 'extrem':158 'field':191 'finance/crypto':114 'follow':144 'global':45 'homepag':139 'infer':113 'key':71 'limit':74 'list':136 'live':201 'lowpaymentfee.com':36,99 'market':115 'network':68 'no-api-key' 'no-rate-limit' 'offer':101 'on-chain':83 'openapi':180 'page':165 'paid':51 'part':94 'pattern':149 'pay':2,18,105 'pay-per-cal':1,17 'pay-per-call stock API' 'pay-per-request':104 'payload':185 'payment':80,148 'per':3,19,53,106 'per-cal':52 'per-call-payment' 'platform':98 'point':127 'post':49 'price':126,151,162 'probe':131 'prompt':172 'protocol':58 'provid':37 'quot':6,22 'rate':73 'render':167 'request':50,60,107 'request/response':184 'requir':78 'respons':195,213 'return':202,219 'sampl':212 'schema':181 'servic':119 'settl':10,26,82 'shape':216 'simpl':48 'span':109 'spars':159 'specif':129 'specifi':88 'stock':5,21,38,193 'stock price API' 'stock-quote' 'subscript':77 'ticker':42 'unknown':222 'usdc':12,28,64 'usdc-settlement' 'use':55 'util':118 'valid':204 'via':15,31,46 'wallet':89,171 'without':209 'x402':16,32,57,147,205 'x402 stock endpoint' 'x402-protocol'","prices":[{"id":"464b5dd3-d1db-43cd-baed-4e8b87e8be33","listingId":"875362b1-b183-4242-8849-f8b3c2f71be0","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/COIN","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:43.641Z"}],"sources":[{"listingId":"875362b1-b183-4242-8849-f8b3c2f71be0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/COIN","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:43.641Z","lastSeenAt":"2026-04-30T00:05:08.787Z"}],"details":{"listingId":"875362b1-b183-4242-8849-f8b3c2f71be0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/COIN \\\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 valid x402 challenge with maxAmountRequired of 20000 base units (USDC, 6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stocks/COIN"},{"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 asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is USDC on Base","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching real-time or recent stock data for Coinbase (COIN) without needing an API key or subscription","Integrating stock lookups into autonomous agents that can pay per-call with USDC on Base","Building trading dashboards or alerts that pull COIN price data on demand"],"bestFor":["Agents or bots that need keyless, on-demand stock data with crypto micropayments","Developers prototyping financial tools who want zero-commitment API access","x402-compatible wallets and agent frameworks looking for pay-per-use data feeds"],"notFor":["High-frequency trading requiring sub-millisecond latency and guaranteed SLAs","Users who need comprehensive multi-ticker stock data in bulk","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:58.848Z"},"updatedAt":"2026-04-30T00:05:08.787Z"}}