{"id":"3912df8d-6799-4a6f-a22f-3745ea0477f0","shortId":"MytgcU","kind":"x402","title":"Pay-per-call BTC quote endpoint on Base via x402, $0.02 per request in USDC.","tagline":"Pay-per-call BTC quote endpoint on Base via x402, $0.02 per request in USDC.","description":"This x402-enabled endpoint at lowpaymentfee.com provides Bitcoin (BTC) cryptocurrency quotes via a simple POST request. It is part of a broader suite of pay-per-call APIs covering finance, AI/ML, data analytics, and utility services, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe endpoint uses the x402 payment protocol: callers receive a 402 Payment Required challenge containing payment details (payTo address, asset contract, max amount). After settling the micro-payment on-chain, the caller includes the payment proof in an X-PAYMENT header to access the resource. The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02. No API keys, rate limits, or upfront commitments are needed — access is purely pay-per-use.\n\nDocumentation on the site 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 schema, no example request/response payloads, and no description of the response format beyond the stated MIME type of application/json. The specific fields returned in a BTC quote (e.g., price, volume, timestamp) are not documented and must be discovered by making a paid call.","tags":[],"capabilities":["btc-quote","crypto-price-data","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["finance","crypto"],"synonyms":["bitcoin price API","BTC quote","crypto market data","bitcoin price feed","cryptocurrency quotes","BTC USD price","token quotes"],"warnings":["No OpenAPI or schema documentation available — response format is unknown","All doc/pricing/README pages render only 'Connect wallet' with no technical content","No example request or response payloads available; output must be discovered via paid call","The broader site lists many endpoints across diverse categories (AI, analytics, finance, utils) all at $0.02 — actual functionality behind each is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/crypto/quotes/btc","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/crypto/quotes/btc","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, and all documentation pages return only a wallet-connect prompt. Effectively a stub listing with minimal verifiable detail about what the response 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'000':139 '20':138 '402':95 '6':144 'BTC USD price' 'BTC quote' 'access':130,159 'address':103 'ai/ml':65 'amount':107,135 'analyt':67 'api':62,150,175 'application/json':214 'asset':104 'base':9,25,83,140 'base-network' 'beyond':208 'bitcoin':41 'bitcoin price API' 'bitcoin price feed' 'broader':55 'btc':5,21,42,221 'btc-quote' 'call':4,20,61,238 'caller':92,118 'chain':116 'challeng':98 'commit':156 'connect':184 'contain':99 'contract':105 'cover':63 'crypto market data' 'crypto-price-data' 'cryptocurr':43 'cryptocurrency quotes' 'data':66 'decim':145 'descript':203 'detail':101,191 'discov':233 'doc':174 'document':166,229 'e.g':223 'enabl':36 'endpoint':7,23,37,86 'equal':147 'exampl':198 'extrem':171 'field':217 'financ':64 'format':207 'header':128 'includ':119 'key':151 'limit':153 'lowpaymentfee.com':39 'make':235 'max':106,134 'micro':112 'micro-pay':111 'mime':211 'must':231 'need':158 'network':84 'no-api-key' 'on-chain':114 'openapi':195 'page':179 'paid':237 'part':52 'pay':2,18,59,163 'pay-per-cal':1,17,58 'pay-per-call' 'pay-per-us':162 'payload':200 'payment':90,96,100,113,121,127 'payto':102 'per':3,13,19,29,60,75,164 'post':48 'price':72,176,224 'prompt':186 'proof':122 'protocol':91 'provid':40 'pure':161 'quot':6,22,44,222 'rate':152 'readm':178 'receiv':93 'render':181 'request':14,30,49,76 'request/response':199 'requir':97,136 'resourc':132 'respons':206 'return':218 'schema':196 'servic':70 'settl':78,109 'simpl':47 'site':169 'spars':172 'specif':216 'state':210 'suit':56 'technic':190 'timestamp':226 'token quotes' 'type':212 'unit':141 'upfront':155 'usdc':16,32,80,143 'usdc-settlement' 'use':87,165 'util':69 'via':10,26,45 'volum':225 'wallet':185 'x':126 'x-payment':125 'x402':11,27,35,89 'x402-enabled':34 'x402-payment'","prices":[{"id":"92c32046-ad04-4334-bb38-51bf93f68383","listingId":"3912df8d-6799-4a6f-a22f-3745ea0477f0","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/crypto/quotes/btc","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:33.691Z"}],"sources":[{"listingId":"3912df8d-6799-4a6f-a22f-3745ea0477f0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/crypto/quotes/btc","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:33.691Z","lastSeenAt":"2026-04-24T08:02:36.075Z"}],"details":{"listingId":"3912df8d-6799-4a6f-a22f-3745ea0477f0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/crypto/quotes/btc \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base network, maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/crypto/quotes/btc"},{"claim":"All APIs priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/crypto/quotes endpoint is listed under Finance & Web3 as 'Token Quotes'","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/crypto/quotes/btc"}],"useCases":["Fetching real-time BTC price quotes for trading bots or portfolio trackers","Integrating Bitcoin pricing data into agent workflows without API key management","Pay-per-use crypto market data for low-volume or sporadic consumers"],"bestFor":["Agents or bots that need on-demand BTC quotes without subscription overhead","Developers prototyping crypto-aware applications with minimal setup","x402-native workflows that settle micro-payments on Base"],"notFor":["High-frequency trading requiring sub-second latency and bulk pricing","Users who need comprehensive multi-asset market data in a single call","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.561Z"},"updatedAt":"2026-04-24T08:02:36.075Z"}}