{"id":"fe5169fe-4fe2-40c1-8bc0-6f193d106e22","shortId":"eqKpN4","kind":"x402","title":"Market quote for BLK token via x402 micropayment on Base network, $0.02 per request.","tagline":"Market quote for BLK token via x402 micropayment on Base network, $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides a market quote for the \"BLK\" token (or asset) via the path `/api/v1/market/quote/BLK`. It is part of a broader platform offering pay-per-call APIs across data analytics, AI/ML inference, finance, crypto, and utility categories — all settled via the x402 protocol on the Base network using USDC.\n\nThe endpoint accepts POST requests and returns JSON. Payment is handled inline: callers attach an X-PAYMENT header containing a signed x402 payment for up to $0.02 in USDC (the challenge advertises maxAmountRequired of 20,000 base units, which is 0.02 USDC given 6 decimals). There are no API keys, no rate limits, and no signup — access is instant once payment is included. The x402 challenge specifies the \"exact\" scheme, Base network, and a 300-second timeout.\n\nThe platform lists many other endpoints at the same $0.02 price point covering sentiment analysis, text summarization, embeddings, price feeds, exchange rates, gas estimates, geocoding, and more. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas for this specific endpoint are not publicly available. The exact structure of the BLK quote response (fields, supported parameters) is unknown from the crawled material.","tags":[],"capabilities":["market-quote","crypto-price-data","x402-payment","base-network","usdc-settlement","pay-per-request","no-api-key"],"categories":["finance","crypto"],"synonyms":["BLK token quote","BLK market price","crypto quote API","token price lookup","BLK price feed","x402 market data"],"warnings":["No public documentation available — docs, pricing, and API pages all require wallet connection to view content.","The exact request body format and response schema for /api/v1/market/quote/BLK are unknown.","It is unclear what 'BLK' refers to — no token metadata or description is provided by the platform.","The platform lists many endpoints at the same price; quality and reliability of each is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/market/quote/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/market/quote/BLK","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format, no examples, and the docs pages are gated behind wallet connection. The identity of \"BLK\" as a token is not explained. This is effectively a stub listing with confirmed 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'0.02':12,26,109,123,169 '000':118 '20':117 '300':157 '6':126 'BLK market price' 'BLK price feed' 'BLK token quote' 'accept':84 'access':139 'across':60 'advertis':114 'ai/ml':63 'analysi':174 'analyt':62 'api':59,131 'appear':191 'asset':42 'attach':95 'avail':208 'base':10,24,78,119,153 'base-network' 'behind':193 'blk':4,18,39,214 'broader':52 'call':58 'caller':94 'categori':69 'challeng':113,148 'connect':196 'contain':101 'cover':172 'crawl':224 'crypto':66 'crypto quote API' 'crypto-price-data' 'data':61 'decim':127 'detail':198 'document':187 'embed':177 'endpoint':30,83,165,204 'estim':183 'exact':151,210 'exchang':180 'exist':189 'feed':179 'field':217 'financ':65 'gas':182 'gate':192 'geocod':184 'given':125 'handl':92 'header':100 'includ':145 'infer':64 'inlin':93 'instant':141 'json':89 'key':132 'limit':135 'list':162 'lowpaymentfee.com':32 'mani':163 'market':1,15,35 'market-quote' 'materi':225 'maxamountrequir':115 'micropay':8,22 'network':11,25,79,154 'no-api-key' 'offer':54 'page':188 'paramet':219 'part':49 'path':45 'pay':56 'pay-per-cal':55 'pay-per-request' 'payment':90,99,105,143 'per':13,27,57 'platform':53,161 'point':171 'post':85 'price':170,178 'protocol':75 'provid':33 'public':207 'quot':2,16,36,215 'rate':134,181 'request':14,28,86 'request/response':199 'respons':216 'return':88 'schema':200 'scheme':152 'second':158 'sentiment':173 'settl':71 'sign':103 'signup':138 'specif':203 'specifi':149 'structur':211 'summar':176 'support':218 'text':175 'timeout':159 'token':5,19,40 'token price lookup' 'unit':120 'unknown':221 'usdc':81,111,124 'usdc-settlement' 'use':80 'util':68 'via':6,20,43,72 'wallet':195 'x':98 'x-payment':97 'x402':7,21,74,104,147 'x402 market data' 'x402-payment'","prices":[{"id":"3b460867-f215-4f25-ade0-885a2804a9c1","listingId":"fe5169fe-4fe2-40c1-8bc0-6f193d106e22","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/market/quote/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":"2026-04-18T18:33:38.606Z"}],"sources":[{"listingId":"fe5169fe-4fe2-40c1-8bc0-6f193d106e22","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/market/quote/BLK","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:38.606Z","lastSeenAt":"2026-04-23T20:01:27.566Z"}],"details":{"listingId":"fe5169fe-4fe2-40c1-8bc0-6f193d106e22","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/market/quote/BLK \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-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 challenge with maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/market/quote/BLK"},{"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":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/market/quote/BLK"}],"useCases":["Fetching a real-time market quote for the BLK token programmatically","Integrating BLK price data into a trading bot or portfolio tracker","Agent-driven market data retrieval with automatic micropayment settlement"],"bestFor":["Developers needing on-demand BLK token pricing without API key management","AI agents that can settle x402 payments autonomously on Base","Low-volume or sporadic market data consumers who prefer pay-per-call over subscriptions"],"notFor":["High-frequency trading requiring sub-second latency and bulk pricing tiers","Users who need detailed historical OHLCV data (no evidence this endpoint provides it)","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:18:36.739Z"},"updatedAt":"2026-04-23T20:01:27.566Z"}}