{"id":"ab047cfa-f12b-43af-a3a3-9e6d97512668","shortId":"6seMcs","kind":"x402","title":"Get the current BTC price via x402 micropayment on Base for $0.02 per request.","tagline":"Get the current BTC price via x402 micropayment on Base for $0.02 per request.","description":"This endpoint returns the current Bitcoin (BTC) price in JSON format, gated behind an x402 payment challenge on the Base network. It is part of a broader suite of APIs offered by lowpaymentfee.com, which spans data analytics, AI/ML inference, finance/Web3 data, and utility services — all priced at $0.02 per request, payable in USDC on Base with no API keys, no rate limits, and no commitments.\n\nThe specific endpoint `/api/v1/tokens/BTC/price` accepts POST requests and returns a JSON response. Payment is handled via the x402 protocol: callers must include an `X-PAYMENT` header containing a valid payment proof for up to 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 USD (USDC uses 6 decimals). The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a maximum timeout of 300 seconds.\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 proper 402 challenge), but the actual response format for a successful paid request is unknown.","tags":[],"capabilities":["btc-price","crypto-price-feed","x402-payment","usdc-base","micropayment-api","real-time-pricing","no-api-key"],"categories":["finance","crypto"],"synonyms":["bitcoin price API","BTC spot price","crypto price endpoint","token price lookup","bitcoin market data","x402 crypto API","micropayment price feed"],"warnings":["No OpenAPI or schema documentation available — response format for successful requests is unknown.","All doc/pricing/README pages return only a 'Connect wallet' prompt with no technical content.","The endpoint path suggests BTC price data, but no formal specification confirms the response fields."],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/BTC/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/tokens/BTC/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 with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request/response schema, no example payloads, and all documentation pages beyond the landing page are empty. The actual response format must be guessed from the endpoint path 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'/api/v1/tokens/btc/price':97 '/docs':169 '/pricing':171 '/readme':173 '0.02':12,26,76,140 '000':130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':135 '20':129 '300':158 '402':211 '6':144 'BTC spot price' 'accept':98 'actual':215 'addit':184 'address':151 'ai/ml':66 'analyt':65 'api':58,86 'base':10,24,48,83,131,137 'behind':41 'beyond':161 'bitcoin':34 'bitcoin market data' 'bitcoin price API' 'broader':55 'btc':4,18,35 'btc-price' 'caller':113 'challeng':45,212 'commit':93 'confirm':206 'connect':179 'contain':121 'crypto price endpoint' 'crypto-price-feed' 'current':3,17,33 'data':64,69 'decim':145 'descript':198 'detail':186 'document':160 'endpoint':30,96,204 'equal':139 'exampl':193 'extrem':166 'finance/web3':68 'format':39,217 'gate':40 'get':1,15 'handl':108 'header':120 'includ':115 'infer':67 'json':38,104 'key':87 'land':163 'limit':90 'live':207 'lowpaymentfee.com':61 'maximum':155 'micropay':8,22 'micropayment price feed' 'micropayment-api' 'must':114 'network':49 'no-api-key' 'offer':59 'openapi':190 'page':164,174 'paid':221 'part':52 'payabl':79 'payload':195 'payment':44,106,119,124,147 'per':13,27,77 'post':99 'price':5,19,36,74 'prompt':181 'proof':125 'proper':210 'protocol':112 'rate':89 'real-time-pricing' 'render':176 'request':14,28,78,100,222 'request/response':194 'respons':105,201,216 'return':31,102,208 'schema':202 'second':159 'sent':149 'servic':72 'span':63 'spars':167 'spec':191 'specif':95 'success':220 'suit':56 'technic':185 'timeout':156 'token price lookup' 'unit':132 'unknown':224 'usd':141 'usdc':81,134,142 'usdc-base' 'use':143 'util':71 'valid':123 'via':6,20,109 'wallet':180 'x':118 'x-payment':117 'x402':7,21,43,111 'x402 crypto API' 'x402-payment'","prices":[{"id":"89442611-178c-4671-8712-47773cc68d9f","listingId":"ab047cfa-f12b-43af-a3a3-9e6d97512668","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/tokens/BTC/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":"2026-04-18T18:36:36.699Z"}],"sources":[{"listingId":"ab047cfa-f12b-43af-a3a3-9e6d97512668","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/BTC/price","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:36.699Z","lastSeenAt":"2026-04-24T09:03:04.415Z"}],"details":{"listingId":"ab047cfa-f12b-43af-a3a3-9e6d97512668","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/BTC/price \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/tokens/BTC/price"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching the current BTC price for trading bots or portfolio dashboards","Agent-driven price lookups where per-call micropayments replace API key management","Integrating real-time Bitcoin pricing into Web3 dApps without subscription overhead"],"bestFor":["AI agents needing on-demand BTC price data with no signup","Low-volume or sporadic price lookups where per-call pricing is cheaper than a subscription","Developers prototyping crypto apps who want instant API access without credentials"],"notFor":["High-frequency trading requiring sub-second latency and bulk pricing (no documented rate guarantees)","Users who need historical OHLCV candle data or order-book depth (only current price is indicated)","Non-crypto callers who cannot produce x402 payment proofs on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.241Z"},"updatedAt":"2026-04-24T09:03:04.415Z"}}