{"id":"6cc23cb2-cefc-4719-b999-93e4e8a53fa6","shortId":"tv7pAj","kind":"x402","title":"Pay-per-call market quote endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call market quote endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This endpoint at `/api/v1/market/quote/HD` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 protocol to accept micropayments in USDC on the Base network, with no API keys, no rate limits, and no subscriptions required.\n\nThe specific `/market/quote/HD` path is listed under the provider's umbrella as \"Premium API Access.\" Based on the site's finance and crypto category (which includes price feeds, exchange rates, token quotes, and gas estimates), this endpoint likely returns market quote data, though the exact response schema is not documented. The x402 challenge confirms the endpoint is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals) on the Base network.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The endpoint path suggests \"HD\" may refer to a specific market or asset class, but this is unconfirmed. Prospective users should be aware that without documented input parameters or response formats, integration requires experimentation or contacting the provider.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","market-quote","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","crypto"],"synonyms":["market data API","price quote","crypto quote","USDC micropayment API","x402 API","pay-per-call finance","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No request or response schema provided; input parameters are unknown","The meaning of 'HD' in the endpoint path is undocumented","No examples or sample responses available from the provider"],"endpointUrl":"https://lowpaymentfee.com/api/v1/market/quote/HD","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/HD","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the exact purpose of the '/market/quote/HD' path is unclear. This is effectively a stub 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'/market/quote/hd':93 '/request':17,34 '0.02':16,33,164 '000':158 '20':157 '6':170 'USDC micropayment API' 'accept':72,149 'access':105 'ai/ml':58 'analyt':57 'api':54,82,104,182 'asset':223 'avail':210 'awar':233 'base':9,26,78,106,159,174 'base-network' 'call':4,21 'categori':114 'challeng':143 'charg':153 'class':224 'confirm':144 'connect':191 'contact':246 'content':197 'crypto':61,113 'crypto quote' 'data':56,132 'decim':171 'doc':181 'document':140,176,236 'endpoint':7,24,36,66,127,146,212 'estim':125 'exact':135 'exampl':209 'exchang':119 'experiment':244 'extrem':178 'feed':118 'financ':60,111 'format':241 'gas':124 'hd':215 'i.e':163 'includ':116 'infer':59 'input':237 'integr':242 'key':83 'like':128 'limit':86 'list':96 'live':148 'lowpaymentfee' 'lowpaymentfee.com':43 'market':5,22,130,221 'market data API' 'market-quote' 'maximum':155 'may':216 'micropay':73 'network':79,175 'no-api-key' 'offer':46 'openapi':201 'page':186 'paramet':238 'part':40 'path':94,213 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call finance' 'pay-per-request':50 'per':3,20,52,165 'platform':44 'post':150 'post-endpoint' 'premium':103 'price':117,183 'price quote' 'prompt':193 'prospect':229 'protocol':70 'provid':99,248 'quot':6,23,122,131 'rate':85,120 'readm':185 'refer':217 'render':188 'request':53,151,166 'request/response':204 'requir':90,243 'respons':136,240 'return':129 'schema':137,205 'servic':64 'settl':12,29 'sinc':167 'site':109 'span':55 'spars':179 'spec':202 'specif':92,220 'subscript':89 'suggest':214 'suit':48 'though':133 'token':121 'umbrella':101 'unconfirm':228 'unit':160 'usag':208 'usdc':14,31,75,162,168 'usdc-micropayment' 'use':67,169 'user':230 'util':63 'via':10,27 'wallet':192 'without':235 'x402':11,28,69,142 'x402 API' 'x402-payment'","prices":[{"id":"5cc1a261-93e2-4142-8bf0-1c275a62ef06","listingId":"6cc23cb2-cefc-4719-b999-93e4e8a53fa6","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/HD","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:00.011Z"}],"sources":[{"listingId":"6cc23cb2-cefc-4719-b999-93e4e8a53fa6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/market/quote/HD","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:00.011Z","lastSeenAt":"2026-04-23T20:01:24.606Z"}],"details":{"listingId":"6cc23cb2-cefc-4719-b999-93e4e8a53fa6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/market/quote/HD \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/market/quote/HD"},{"claim":"The maximum amount required is 20,000 base units of USDC ($0.02) per request","source_url":"https://lowpaymentfee.com/api/v1/market/quote/HD"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists finance and crypto APIs including price feeds, exchange rates, token quotes, and gas estimates","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching real-time or on-demand market quotes for trading or analytics","Integrating pay-per-call market data into autonomous agent workflows","Accessing financial data without managing API keys or subscriptions"],"bestFor":["Agents or bots that need on-demand market quotes with no signup","Developers prototyping crypto-native pay-per-use data pipelines","Low-volume consumers who want to avoid subscription commitments"],"notFor":["High-volume production use cases requiring documented SLAs and response schemas","Users who need detailed API documentation and integration guides before committing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:32:46.203Z"},"updatedAt":"2026-04-23T20:01:24.606Z"}}