{"id":"d3c55d46-fff9-4555-bb30-efc6a0f45768","shortId":"UuZts9","kind":"x402","title":"Pay-per-call stock price lookup for USB via x402 on Base, settled in USDC.","tagline":"Pay-per-call stock price lookup for USB via x402 on Base, settled in USDC.","description":"This endpoint at lowpaymentfee.com returns stock price data for the ticker \"USB\" (U.S. Bancorp). It is part of a broader suite of pay-per-request APIs offered by lowpaymentfee.com, which spans data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, requiring a one-time USDC micropayment on the Base network per request — no API keys, no subscriptions, no rate limits.\n\nThe specific endpoint `/api/v1/stocks/USB/price` accepts POST requests and returns JSON. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema. The endpoint is confirmed live (returns a valid 402 challenge), but the actual data source, update frequency, and response format for stock prices are unknown.","tags":[],"capabilities":["stock-price-lookup","x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key"],"categories":["finance","data"],"synonyms":["stock price API","USB stock quote","equity price endpoint","US Bancorp stock","x402 stock data","micropayment stock API","pay-per-call finance"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All doc pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The stock ticker 'USB' in the URL path is hardcoded; it is unclear whether other tickers are supported at similar paths","Data source, freshness, and accuracy of stock prices are undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/USB/price","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/USB/price","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 challenge with clear pricing, but there is no OpenAPI spec, no documented request/response schema, no example payloads, and all documentation pages are empty beyond a wallet-connect prompt. The actual data source and response format are entirely 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'/api/v1/stocks/usb/price':105 '/docs':161 '/pricing':163 '/readme':165 '0.02':132 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x8335':126 '20':120 '2913':127 '300':148 '402':203 '6':137 'US Bancorp stock' 'USB stock quote' 'accept':106 'actual':207 'addit':176 'address':144 'advertis':115 'ai/ml':67 'analyt':66 'api':59,95 'bancorp':46 'base':13,29,90,122,129 'base-network' 'beyond':153 'broader':52 'call':4,20,134 'challeng':114,204 'confirm':198 'connect':171 'cost':118 'crypto':70 'data':40,65,208 'decim':138 'descript':190 'detail':178 'document':152 'endpoint':34,75,104,196 'equal':131 'equity price endpoint' 'exampl':185 'extrem':158 'financ':69 'format':214 'frequenc':211 'infer':68 'json':111 'key':96 'land':155 'limit':101 'live':199 'lookup':7,23 'lowpaymentfee.com':36,62 'maximum':117 'micropay':87 'micropayment stock API' 'network':91 'no-api-key' 'offer':60 'one':84 'one-tim':83 'openapi':182 'page':156,166 'part':49 'pay':2,18,56 'pay-per-cal':1,17 'pay-per-call finance' 'pay-per-request':55 'payload':187 'payment':79,140 'per':3,19,57,92,133 'post':107 'price':6,22,39,217 'prompt':173 'protocol':80 'rate':100 'render':168 'request':58,93,108 'request/response':186 'requir':81 'respons':193,213 'return':37,110,200 'schema':194 'second':149 'sent':142 'servic':73 'settl':14,30 'sourc':209 'span':64 'spars':159 'spec':183 'specif':103 'stock':5,21,38,216 'stock price API' 'stock-price-lookup' 'subscript':98 'suit':53 'technic':177 'ticker':43 'time':85 'timeout':150 'u.s':45 'unit':123 'unknown':219 'updat':210 'usb':9,25,44 'usdc':16,32,86,125,135 'usdc-micropayment' 'use':76,136 'util':72 'valid':202 'via':10,26 'wallet':172 'window':151 'x402':11,27,78,113 'x402 stock data' 'x402-payment'","prices":[{"id":"a4f9f43e-b9e7-40df-b793-d0bab595e420","listingId":"d3c55d46-fff9-4555-bb30-efc6a0f45768","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/USB/price","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:42.467Z"}],"sources":[{"listingId":"d3c55d46-fff9-4555-bb30-efc6a0f45768","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/USB/price","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:42.467Z","lastSeenAt":"2026-04-23T20:01:32.802Z"}],"details":{"listingId":"d3c55d46-fff9-4555-bb30-efc6a0f45768","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/USB/price \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stocks/USB/price"},{"claim":"The site advertises $0.02 per request across all APIs with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stocks/USB/price"}],"useCases":["Fetching the current price of U.S. Bancorp (USB) stock programmatically","Agent-driven portfolio monitoring that pays per data request","Integrating real-time equity pricing into trading bots without API key management"],"bestFor":["AI agents needing on-demand stock price data with no signup","Developers who want keyless, pay-as-you-go financial data","Crypto-native workflows that can settle USDC on Base"],"notFor":["Bulk historical stock data retrieval (single-ticker, single-call design)","Users who cannot transact in USDC on the Base network","Applications requiring documented response schemas or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:36:42.141Z"},"updatedAt":"2026-04-23T20:01:32.802Z"}}