{"id":"215791ac-fcef-435b-a8ff-cff9cbf6301d","shortId":"2Wxv9Q","kind":"x402","title":"Pay-per-call stock data for BLK (BlackRock) via x402 on Base, settled in USDC.","tagline":"Pay-per-call stock data for BLK (BlackRock) via x402 on Base, settled in USDC.","description":"This endpoint at lowpaymentfee.com provides stock data for the ticker BLK (BlackRock, Inc.) through an x402 payment-gated API. Each request costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The caller sends an X-PAYMENT header containing a signed USDC payment of up to 20,000 base units (0.02 USDC at 6 decimals) and receives a JSON response with stock information.\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, and utility services, all at the same $0.02/request price point. The /api/v1/stocks/BLK route specifically targets equity market data for BlackRock. The x402 challenge confirms the endpoint is live, accepts POST requests, and settles payments to address 0x1A2B…85F3 using USDC (contract 0x8335…2913) on Base.\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 further technical detail. There is no OpenAPI spec, no example request/response payloads, and no description of the response schema. Prospective users should expect to discover the response format empirically.","tags":[],"capabilities":["stock-data","per-call-payment","x402-protocol","usdc-settlement","base-network","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["stock price API","BLK stock data","BlackRock stock API","pay-per-call stock endpoint","x402 stock data","USDC stock API","equity data API"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All documentation pages (/docs, /pricing, /api, /README) render only a wallet-connect prompt with no technical content","No example responses or field descriptions for the stock data returned","The platform lists many endpoint categories but specifics for /stocks/BLK are not documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stocks/BLK","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI spec, no documented request/response schema, no example payloads, and the docs pages are empty. The actual data returned is unknown, making this effectively a stub 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'/api/v1/stocks/blk':143 '/docs':186 '/pricing':188 '/readme':190 '/request':139 '0.02':56,93,138 '000':90 '0x1a2b':168 '0x8335':173 '20':89 '2913':174 '6':96 '85f3':169 'BLK stock data' 'BlackRock stock API' 'USDC stock API' 'accept':160 'address':167 'ai/ml':127 'analyt':126 'api':52,64,123 'base':13,29,61,91,176 'base-network' 'beyond':178 'blackrock':9,25,44,151 'blk':8,24,43 'broader':112 'call':4,20,122 'caller':74 'challeng':154 'confirm':155 'connect':196 'contain':81 'contract':172 'cost':55 'crypto':130 'data':6,22,39,125,149 'decim':97 'descript':215 'detail':203 'discov':225 'document':177 'dozen':117 'empir':229 'endpoint':34,107,157 'equiti':147 'equity data API' 'exampl':210 'expect':223 'extrem':183 'financ':129 'format':228 'gate':51 'header':80 'inc':45 'infer':128 'inform':105 'json':101 'json-response' 'key':65 'land':180 'limit':68 'live':159 'lowpaymentfee.com':36,114 'market':148 'network':62 'no-api-key' 'offer':116 'openapi':207 'page':181,191 'part':109 'pay':2,18,120 'pay-per-cal':1,17,119 'pay-per-call stock endpoint' 'payload':212 'payment':50,79,85,165 'payment-g':49 'per':3,19,121 'per-call-payment' 'platform':113 'point':141 'post':161 'price':140 'prompt':198 'prospect':220 'provid':37 'rate':67 'receiv':99 'render':193 'request':54,162 'request/response':211 'requir':72 'respons':102,218,227 'rout':144 'schema':219 'send':75 'servic':133 'settl':14,30,164 'sign':83 'span':124 'spars':184 'spec':208 'specif':145 'stock':5,21,38,104 'stock price API' 'stock-data' 'subscript':71 'target':146 'technic':202 'ticker':42 'unit':92 'usdc':16,32,58,84,94,171 'usdc-settlement' 'use':170 'user':221 'util':132 'via':10,26 'wallet':197 'x':78 'x-payment':77 'x402':11,27,48,153 'x402 stock data' 'x402-protocol'","prices":[{"id":"6f3f6818-97e7-40ee-bf26-240ca2e17f15","listingId":"215791ac-fcef-435b-a8ff-cff9cbf6301d","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","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:07.332Z"}],"sources":[{"listingId":"215791ac-fcef-435b-a8ff-cff9cbf6301d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stocks/BLK","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:07.332Z","lastSeenAt":"2026-04-29T09:08:16.073Z"}],"details":{"listingId":"215791ac-fcef-435b-a8ff-cff9cbf6301d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stocks/BLK \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge accepting USDC on Base, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/stocks/BLK"},{"claim":"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":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stocks/BLK"}],"useCases":["Fetching current stock data for BlackRock (BLK) without managing API keys or subscriptions","Integrating real-time equity information into autonomous agent workflows that can settle USDC on Base","Building trading dashboards or alerts that pay per request with no minimum commitment"],"bestFor":["Agents or bots that need on-demand stock data with crypto-native payment","Developers who want zero-signup access to BLK equity data","Low-volume or sporadic stock data consumers who prefer pay-per-call pricing"],"notFor":["High-frequency trading requiring sub-millisecond latency and bulk data feeds","Users who need comprehensive multi-ticker equity data in a single call","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.905Z"},"updatedAt":"2026-04-29T09:08:16.073Z"}}