{"id":"0ba51e94-99c5-446a-98e5-f8dd787916d8","shortId":"RMWqAx","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 infrastructure utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments required.\n\nThe specific endpoint at `/api/v1/messages/64` 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 decimals. The endpoint accepts HTTP POST requests and returns `application/json`. Payment is sent to `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-request","json-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","analytics","finance-data","crypto-data","geocoding","data-export"],"categories":["llm","data","finance","infrastructure"],"synonyms":["low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API","premium API access"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The exact purpose and expected input/output of /api/v1/messages/64 is undocumented","Most site pages are gated behind a wallet-connect flow, preventing documentation crawl","No example requests or responses are available to verify endpoint behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/64","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/64","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 with clear pricing, but there is no OpenAPI schema, no documentation of request/response formats, and no example payloads. The crawled pages beyond the landing page are empty (wallet-connect gates). The specific purpose of /api/v1/messages/64 is unclear beyond the generic label 'Premium API 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'/request':18,36 '0.02':17,35,68,124,180 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '0x8335':118 '20':112 '2913':119 '300':146 '6':128 'Base network API' 'USDC API' 'accept':132 'access':103 'addit':153 'advertis':107,152 'ai':11,29 'ai-inference' 'ai/ml':55 'analysi':157 'analyt':12,30,54 'analytics' 'api':5,23,43,83,102 'application/json':138 'avail':194 'base':8,26,76,114,121 'broad':48 'broader':150 'call':4,22 'challeng':106 'classif':160 'classification' 'collect':49 'commit':91 'convers':172 'cost':110 'cover':10,28 'crawl':197 'crypto-data' 'data':53,58,174 'data-export' 'decim':129 'detail':187 'document':188 'embed':161 'embeddings' 'enabl':42 'endpoint':51,64,95,131,154,212 'equal':123 'estim':169 'everi':63 'exact':201 'exampl':190 'exchang':164 'feed':163 'financ':13,31 'finance-data' 'finance/web3':57 'format':206 'gas':168 'general':60 'generat':175 'geocod':170 'geocoding' 'given':125 'howev':183 'http':133 'includ':155 'infer':56 'infrastructur':61 'input':202 'json-api' 'key':84 'limit':87 'list':99 'low payment fee API' 'lowpaymentfee.com':37 'maximum':109 'micropayment API' 'network':77 'offer':46 'openapi':185 'page':198 'paramet':203 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payabl':71 'payload':192 'payment':139 'per':3,21,69 'platform':44,151 'point':182 'post':134 'premium':101 'premium API access' 'price':66,162,181 'protocol':81 'quot':167 'rate':86,165 'remain':213 'request':70,135 'request/response':191 'requir':92 'respons':205 'return':137 'schema':186 'second':147 'sent':141 'sentiment':156 'sentiment-analysis' 'span':52 'specif':94 'suit':6,24 'summar':159 'text':158 'text-summarization' 'timeout':148 'token':166 'unit':115 'unknown':214 'upfront':90 'usdc':9,27,73,117,126 'usdc-base' 'util':15,33,62 'valid':171 'via':78 'x402':41,80,105 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"90d6481d-bd02-4237-8fe9-6594e8b516e6","listingId":"0ba51e94-99c5-446a-98e5-f8dd787916d8","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/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.995Z"}],"sources":[{"listingId":"0ba51e94-99c5-446a-98e5-f8dd787916d8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.995Z","lastSeenAt":"2026-04-22T02:32:08.068Z"}],"details":{"listingId":"0ba51e94-99c5-446a-98e5-f8dd787916d8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/64 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge advertising 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/64"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/64"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Calling AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-request basis","Running geocoding, validation, or data conversion tasks with instant pay-as-you-go access","Exporting data or generating analytics reports without subscription commitments"],"bestFor":["Agents or bots that need on-demand API access without pre-registration","Developers prototyping with multiple utility endpoints at minimal cost","Web3-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing may add up versus flat-rate plans","Use cases requiring detailed SLAs, uptime guarantees, or dedicated support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.073Z"},"updatedAt":"2026-04-22T02:32:08.068Z"}}