{"id":"04a4f4f0-adbc-4a99-a008-0126bf7a4e9e","shortId":"5zLQKf","kind":"x402","title":"Real-time stock price data for BLK (BlackRock) via x402 micropayment on Base network.","tagline":"Real-time stock price data for BLK (BlackRock) via x402 micropayment on Base network.","description":"This x402 endpoint at lowpaymentfee.com returns the current stock price for BLK (BlackRock, Inc.) in exchange for a per-request USDC micropayment on the Base network. The endpoint costs $0.02 per call (20,000 base units of USDC with 6 decimals) and requires no API keys, accounts, or rate-limit management — payment is handled inline via the x402 protocol's X-PAYMENT header.\n\nThe provider, lowpaymentfee.com, hosts a broader catalog 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. This specific endpoint is part of the finance category and serves stock price data. The x402 challenge confirms the endpoint is live, accepts USDC on Base (contract 0x8335…2913), and responds with JSON. The POST method is required.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, and /api pages all render only a wallet-connect 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 path suggests it returns price data for the ticker symbol BLK, but the exact response structure must be discovered empirically.","tags":[],"capabilities":["stock-price-lookup","x402-micropayment","usdc-payment","base-network","per-request-billing","no-api-key","json-response"],"categories":["finance","market-data"],"synonyms":["stock price API","BLK stock price","BlackRock stock price","equity price feed","real-time stock data","x402 stock API","micropayment stock API"],"warnings":["No OpenAPI or schema documentation available — response format must be discovered empirically","Docs, pricing, and API pages on the provider site render only a wallet-connect prompt with no useful content","No example request or response payloads are available from the provider","The exact data source and freshness/latency of stock price data is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/BLK/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/BLK/price","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs pages are empty wallet-connect stubs. The listing is functional but largely a stub in terms of developer 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'/docs':173 '/pricing':174 '0.02':61,124 '000':65 '0x8335':154 '20':64 '2913':155 '6':71 'BLK stock price' 'BlackRock stock price' 'accept':149 'account':78 'addit':188 'ai/ml':113 'analyt':112 'api':76,109 'base':14,29,56,66,152 'base-network' 'beyond':166 'blackrock':9,24,43 'blk':8,23,42,219 'broader':102 'call':63,108 'catalog':103 'categori':135 'challeng':143 'confirm':144 'connect':184 'contract':153 'cost':60 'current':38 'data':6,21,111,117,140,214 'decim':72 'descript':202 'detail':190 'discov':227 'document':165 'empir':228 'endpoint':33,59,129,146,208 'equity price feed' 'exact':222 'exampl':197 'exchang':46 'financ':134 'finance/crypto':115 'handl':86 'header':96 'host':100 'inc':44 'infer':114 'inlin':87 'json':159 'json-response' 'key':77 'land':168 'limit':82 'live':148 'lowpaymentfee.com':35,99 'manag':83 'market':116 'method':162 'micropay':12,27,53 'micropayment stock API' 'must':225 'network':15,30,57 'no-api-key' 'openapi':194 'page':169,177 'part':131 'path':209 'pay':106 'pay-per-cal':105 'payload':199 'payment':84,95 'per':50,62,107,125 'per-request':49 'per-request-billing' 'post':161 'price':5,20,40,122,139,213 'prompt':185 'protocol':91 'provid':98 'rate':81 'rate-limit':80 'real':2,17 'real-tim':1,16 'real-time stock data' 'render':179 'request':51,126 'request/response':198 'requir':74,164 'respond':157 'respons':205,223 'return':36,212 'schema':206 'serv':137 'servic':120 'span':110 'spars':171 'spec':195 'specif':128 'stock':4,19,39,138 'stock price API' 'stock-price-lookup' 'structur':224 'suggest':210 'symbol':218 'technic':189 'ticker':217 'time':3,18 'unit':67 'usdc':52,69,150 'usdc-payment' 'util':119 'via':10,25,88 'wallet':183 'wallet-connect':182 'x':94 'x-payment':93 'x402':11,26,32,90,142 'x402 stock API' 'x402-micropayment'","prices":[{"id":"d70496ce-4877-43f6-bc08-35785d056916","listingId":"04a4f4f0-adbc-4a99-a008-0126bf7a4e9e","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/BLK/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":"2026-04-18T18:33:38.000Z"}],"sources":[{"listingId":"04a4f4f0-adbc-4a99-a008-0126bf7a4e9e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/BLK/price","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:38.000Z","lastSeenAt":"2026-04-22T10:30:54.948Z"}],"details":{"listingId":"04a4f4f0-adbc-4a99-a008-0126bf7a4e9e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/BLK/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":"Endpoint returns HTTP 402 with x402 challenge, confirming it is live on Base network accepting USDC","source_url":"https://lowpaymentfee.com/api/v1/stocks/BLK/price"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stocks/BLK/price"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/stocks/BLK/price"}],"useCases":["Retrieve the current stock price for BlackRock (BLK) in an automated trading or portfolio monitoring agent","Integrate real-time equity pricing into a financial dashboard without managing API keys or subscriptions","Build an AI agent that fetches stock prices on-demand using x402 crypto micropayments"],"bestFor":["Agents or bots that need on-demand stock price lookups without subscription overhead","Developers experimenting with x402 pay-per-call patterns for financial data","Low-volume or bursty use cases where per-request pricing is more economical than a monthly plan"],"notFor":["High-frequency trading requiring sub-millisecond latency or bulk historical data","Users who need comprehensive financial data (fundamentals, filings, options chains) beyond a single price quote","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:32:28.878Z"},"updatedAt":"2026-04-22T10:30:54.948Z"}}