{"id":"588565e3-e03f-4b1e-9f04-008ece8805d8","shortId":"GHd5Vc","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/47` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6-decimal precision. The endpoint accepts HTTP POST and returns `application/json`. The payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled pages, so the exact input parameters and response formats for this or any other endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-api","no-api-key","ai-inference","data-analytics","finance-data","web3-data","utility-endpoints"],"categories":["llm","data","finance","infrastructure"],"synonyms":["low payment fee API","x402 API","micropayment API","pay-per-request API","Base USDC API","cheap API calls","lowpaymentfee"],"warnings":["No OpenAPI or detailed API documentation available; input/output schemas are unknown.","The specific endpoint /api/v1/messages/47 is not listed on the homepage — its purpose ('Premium API Access') is vague and may be a placeholder or test endpoint.","No example requests or responses could be obtained from the crawl; integration requires trial-and-error.","The /api, /pricing, and /README pages all returned only 'Connect wallet' with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/47","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/messages/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation beyond a landing page listing, and no example request/response payloads. The purpose of '/api/v1/messages/47' specifically is unclear — it could be a generic placeholder. Most fields had to be inferred from the homepage 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'/request':18,36 '0.02':17,35,67,127,185 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':121 '20':115 '2913':122 '300':151 '6':131 'Base USDC API' 'accept':136 'access':106 'account':80 'addit':158 'address':147 'advertis':110,157 'ai':11,29 'ai-inference' 'ai/ml':55 'analysi':162 'analyt':12,30,54 'api':5,23,43,78,105 'application/json':141 'attach':88 'avail':199 'base':8,26,75,117,124 'broad':48 'broader':155 'call':4,22 'caller':86 'challeng':109 'cheap API calls' 'classif':165 'collect':49 'convers':177 'cost':113 'cover':10,28 'crawl':202 'data':53,58,179 'data-analytics' 'decim':132 'detail':192 'document':193 'embed':166 'enabl':42 'endpoint':51,63,98,135,159,217 'equal':126 'estim':174 'everi':62 'exact':206 'exampl':195 'exchang':169 'feed':168 'financ':13,31 'finance-data' 'finance/web3':57 'format':211 'gas':173 'general':60 'generat':180 'geocod':175 'given':128 'header':92 'howev':188 'http':137 'includ':160 'infer':56 'input':207 'json-api' 'key':79 'limit':83 'list':102 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'maximum':112 'micropayment API' 'network':76 'no-api-key' 'offer':46 'openapi':190 'page':203 'paramet':208 'pay':2,20 'pay-per-cal':1,19 'pay-per-call' 'pay-per-request API' 'payload':197 'payment':91,143 'per':3,21,68 'platform':44,156 'point':187 'post':138 'precis':133 'premium':104 'price':65,167,186 'quot':172 'rate':82,170 'remain':218 'request':69,95 'request/response':196 'requir':85 'respons':210 'return':140 'schema':191 'second':152 'sentiment':161 'settl':70,145 'simpli':87 'span':52 'specif':97 'suit':6,24 'summar':164 'text':163 'timeout':153 'token':171 'unit':118 'unknown':219 'usdc':9,27,72,120,129 'usdc-base' 'util':15,33,61 'utility-endpoints' 'valid':176 'web3-data' 'x402':41,90,108 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"57e1496f-be77-4657-a620-89bcbf699971","listingId":"588565e3-e03f-4b1e-9f04-008ece8805d8","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/messages/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.079Z"}],"sources":[{"listingId":"588565e3-e03f-4b1e-9f04-008ece8805d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.079Z","lastSeenAt":"2026-04-22T02:32:08.144Z"}],"details":{"listingId":"588565e3-e03f-4b1e-9f04-008ece8805d8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/47 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/47"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/47"},{"claim":"All listed endpoints are 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":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant pay-per-use pricing","Exporting data or generating analytics reports without subscription commitments"],"bestFor":["Agents or bots that need low-friction, keyless API access with crypto micropayments","Developers prototyping with multiple API categories without signing up for separate services","Web3-native applications that can settle payments on Base in USDC"],"notFor":["High-volume production workloads where $0.02/request adds up (no bulk discounts documented)","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.954Z"},"updatedAt":"2026-04-22T02:32:08.144Z"}}