{"id":"533eef38-a6d1-477b-93af-8ea39c6bd89b","shortId":"AEkPhU","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, 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 minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/110` 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, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nPayment is handled via the x402 \"exact\" scheme: the caller must include an `X-PAYMENT` header with a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the payTo address on Base. The timeout for payment settlement is 300 seconds.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion","data-export"],"categories":["llm","geo","finance","data"],"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/110 has no documentation — its purpose, expected input, and response format are unknown.","No OpenAPI spec, no request/response schema, and no usage examples are available.","The /pricing, /api, and /README pages returned no meaningful content (only 'Connect wallet').","The platform lists many endpoint categories (AI, finance, analytics, utilities) but none are individually documented — actual functionality is unverifiable."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/110","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/110","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, the specific /api/v1/messages/110 endpoint has no documentation beyond the generic title \"Premium API Access\", no request/response schema, no examples, and the crawled docs/pricing/README pages returned only \"Connect wallet\" with no useful content. The platform lists many endpoints but provides no detail on any of 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'/request':18,36 '0.02':17,35,69,166,199 '000':195 '20':194 '300':217 '6':203 'accept':130 'access':111 'address':208 'advertis':139 'ai':12,30 'ai-inference' 'ai/ml':55 'analysi':143 'analyt':11,29,54 'api':5,23,43,82,110 'application/json':135 'attach':93 'base':8,26,77,196,210 'base network api' 'beyond':125 'broad':48 'broader':137 'call':4,22 'caller':91,178 'cheap api' 'classif':146 'collect':49 'commit':90 'convers':158 'conversion' 'cover':10,28 'data':53,58,160 'data-analytics' 'data-export' 'decim':204 'document':124 'embed':147 'embeddings' 'enabl':42 'endpoint':51,65,103,140 'estim':155 'everi':64 'exact':120,175 'exchang':150 'exchange-rates' 'feed':149 'financ':13,31 'finance/web3':57 'follow':113 'function':121 'gas':154 'gas-estimates' 'general':61 'general-purpos':60 'generat':161 'generic':127 'geocod':156 'geocoding' 'handl':171 'header':97,185 'http':131 'i.e':198 'includ':180 'infer':56 'key':83 'limit':86 'list':107 'low payment fee' 'lowpaymentfee.com':37 'micropayment api' 'minimum':89 'must':179 'network':78 'no-auth api' 'offer':46 'pattern':118 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':96,117,169,184,190,214 'payto':207 'per':3,21,70 'platform':44,138 'point':168 'post':132 'premium':109 'price':67,148,167 'price-feeds' 'purpos':62 'quot':153 'rate':85,151 'request':71,100 'return':134 'scheme':176 'second':218 'sentiment':142 'sentiment-analysis' 'settl':72 'settlement':215 'sign':188 'simpli':92 'sinc':200 'span':52 'specif':102 'suit':6,24 'summar':145 'text':144 'text-classification' 'text-summarization' 'timeout':212 'titl':128 'token':152 'unit':197 'usdc':9,27,74,189,201 'usdc api' 'usdc-base' 'use':202 'util':15,33,63 'valid':157 'validation' 'via':172 'x':183 'x-payment':182 'x402':41,95,116,174 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"a1b4569b-09d5-4546-a0b1-83ccf80e4a5f","listingId":"533eef38-a6d1-477b-93af-8ea39c6bd89b","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/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.832Z"}],"sources":[{"listingId":"533eef38-a6d1-477b-93af-8ea39c6bd89b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/110","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.832Z","lastSeenAt":"2026-04-22T07:02:09.474Z"}],"details":{"listingId":"533eef38-a6d1-477b-93af-8ea39c6bd89b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/110 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/110","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-signed-usdc-payment>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All 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":"The x402 challenge for /api/v1/messages/110 requires up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/110"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Running AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes, gas estimates, and exchange rates on a per-call basis","Geocoding addresses or validating data with zero upfront commitment","Exporting data or generating analytics reports with micropayments","Agents autonomously purchasing API calls using x402 USDC payments on Base"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access","Web3-native applications that prefer on-chain payment settlement"],"notFor":["High-volume production workloads where per-request pricing becomes expensive compared to subscription plans","Users who need detailed SLAs, rate-limit guarantees, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.99Z"},"updatedAt":"2026-04-22T07:02:09.474Z"}}