{"id":"f628a498-5acf-4531-99d4-c5e6d1c7eb88","shortId":"upGmw2","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-purpose utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no sign-up — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/72` is listed as \"Premium API Access\" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it accepts HTTP POST and returns `application/json`. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nPayment is handled via the x402 \"exact\" scheme: the caller must pay up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout window.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","analytics","finance-data","crypto-quotes","gas-estimates","geocoding","data-export"],"categories":["llm","data","finance","geo","utilities"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","cheap api","no-auth api"],"warnings":["The specific endpoint /api/v1/messages/72 has no documentation — its purpose ('Premium API Access') is a generic label with no details on expected input or output.","No OpenAPI spec, no request/response examples, and no detailed docs were found anywhere on the site.","Pages at /api, /pricing, and /README all returned only 'Connect wallet' with no substantive content.","The broader platform lists many endpoints but none have documented schemas or sample payloads."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/72","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/72","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 confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation for what /api/v1/messages/72 actually does, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The listing is essentially a stub with known 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'/request':18,36 '0.02':17,35,69,165,194 '000':183 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':206 '0x8335':188 '20':182 '2913':189 '300':209 '6':198 'accept':131 'access':112 'address':205 'advertis':140 'ai':11,29 'ai-inference' 'ai/ml':55 'analysi':144 'analyt':12,30,54 'analytics' 'api':5,23,43,82,111 'application/json':136 'attach':94 'base':8,26,77,184,191 'base network api' 'beyond':126 'broad':48 'broader':138 'call':4,22 'caller':92,177 'cheap api' 'classif':147 'classification' 'collect':49 'convers':157 'cover':10,28 'crypto-quotes' 'data':53,58,159 'data-export' 'decim':199 'document':125 'embed':148 'embeddings' 'enabl':42 'endpoint':51,65,104,141 'equal':193 'estim':154 'everi':64 'exact':121,174 'exchang':151 'export':160 'feed':150 'financ':13,31 'finance-data' 'finance/web3':57 'follow':114 'function':122 'gas':153 'gas-estimates' 'general':61 'general-purpos':60 'generic':128 'geocod':155 'geocoding' 'given':195 'handl':170 'header':98 'http':132 'infer':56 'json-api' 'key':83 'limit':86 'list':108 'low payment fee' 'lowpaymentfee.com':37 'micropayment api' 'must':178 'network':78 'no-auth api' 'offer':46 'pattern':119 'pay':2,20,179 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':97,118,168,201 'per':3,21,70 'platform':44,139 'point':167 'post':133 'premium':110 'price':67,149,166 'purpos':62 'rate':85,152 'request':71,101 'return':135 'scheme':175 'second':210 'sent':203 'sentiment':143 'sentiment-analysis' 'settl':72 'sign':90 'sign-up':89 'simpli':93 'span':52 'specif':103 'suit':6,24 'summar':146 'text':145 'text-summarization' 'timeout':211 'titl':129 'unit':185 'usdc':9,27,74,187,196 'usdc api' 'usdc-base' 'util':15,33,63 'valid':156 'via':171 'window':212 'x402':41,96,117,173 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"1bb30475-00e7-4cd9-b8d9-22f2c54afbbd","listingId":"f628a498-5acf-4531-99d4-c5e6d1c7eb88","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/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.977Z"}],"sources":[{"listingId":"f628a498-5acf-4531-99d4-c5e6d1c7eb88","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.977Z","lastSeenAt":"2026-04-22T02:32:08.041Z"}],"details":{"listingId":"f628a498-5acf-4531-99d4-c5e6d1c7eb88","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/72 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/72"},{"claim":"All endpoints 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"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/72"}],"useCases":["Agent-driven data retrieval without API key management","On-demand AI inference (sentiment, summarization, classification, embeddings) at micro-payment scale","Fetching real-time crypto quotes, gas estimates, and exchange rates","Geocoding and data validation as lightweight utility calls","Exporting analytics reports with per-request billing"],"bestFor":["AI agents that need keyless, pay-as-you-go API access","Developers prototyping with low-cost, no-commitment endpoints","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs or rate-limit documentation","Users who need detailed API documentation or OpenAPI schemas before integrating","Callers without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.179Z"},"updatedAt":"2026-04-22T02:32:08.041Z"}}