{"id":"d568d652-91ae-4551-9eee-57508683cc4a","shortId":"yJM9Mc","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/122` is listed as \"Premium API Access\" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic label, so it likely serves a messaging or content-retrieval purpose. The x402 challenge confirms the endpoint is live, accepting POST requests, and requires up to 20,000 base units of USDC (i.e., $0.02) per call on Base.\n\nThe platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All share the same $0.02 pricing. No OpenAPI schema, detailed request/response documentation, or usage examples are provided on the site.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","analytics-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","data-export"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micro-payment api","cheap api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific endpoint /api/v1/messages/122 has no documented purpose beyond the generic label 'Premium API Access'","No request body schema or response format is documented anywhere on the site","Pricing and /README pages returned no useful content (only 'Connect wallet')","Actual functionality of listed endpoints (AI, analytics, finance, etc.) is unverifiable from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/122","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/122","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response documentation, no examples, and the specific endpoint's purpose ('Premium API Access' at /messages/122) is unexplained. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':18,36 '0.02':17,35,69,162,209 '000':156 '20':155 '402 payment api' 'accept':148 'access':111 'advertis':169 'ai':12,30,180 'ai-inference' 'ai/ml':55 'analysi':184 'analyt':11,29,54,174 'analytics-api' 'api':5,23,43,82,110 'attach':93 'base':8,26,77,157,166 'base network api' 'beyond':125 'broad':48 'call':4,22,164 'caller':91 'categori':172 'challeng':142 'cheap api' 'classif':187 'classification' 'collect':49 'commit':90 'confirm':143 'content':137 'content-retriev':136 'convers':203 'cover':10,28 'crypto-quotes' 'data':53,58,173,177 'data-export' 'detail':214 'document':124,216 'embed':188 'embeddings' 'enabl':42 'endpoint':51,65,103,145,171 'estim':198 'everi':64 'exact':120 'exampl':219 'exchang':193 'export':178 'feed':192 'financ':13,31,189 'finance-data' 'finance/web3':57 'follow':113 'four':170 'function':121 'gas':197 'gas-estimates' 'general':61 'general-purpos':60 'generat':204 'generic':127 'geocod':201 'geocoding' 'header':97 'i.e':161 'infer':56 'infrastructur':200 'insight':179 'key':83 'label':128 'learn':182 'like':131 'limit':86 'list':107 'live':147 'low payment fee' 'lowpaymentfee.com':37 'machin':181 'messag':134 'metric':175 'micro-payment api' 'minimum':89 'network':78 'offer':46 'openapi':212 'pattern':118 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':96,117 'per':3,21,70,163 'platform':44,168 'post':149 'premium':109 'price':67,191,210 'provid':221 'purpos':62,139 'quot':196 'rate':85,194 'report':176 'request':71,100,150 'request/response':215 'requir':152 'retriev':138 'schema':213 'sentiment':183 'sentiment-analysis' 'serv':132 'settl':72 'share':206 'simpli':92 'site':224 'span':52 'specif':102 'suit':6,24 'summar':186 'text':185 'text-summarization' 'token':195 'unit':158 'usag':218 'usdc':9,27,74,160 'usdc api' 'usdc-base' 'util':15,33,63 'valid':202 'web3':190 'x402':41,95,116,141 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"46b9901a-282d-4841-ac34-b3a7df2d3a48","listingId":"d568d652-91ae-4551-9eee-57508683cc4a","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/122","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.929Z"}],"sources":[{"listingId":"d568d652-91ae-4551-9eee-57508683cc4a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/122","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.929Z","lastSeenAt":"2026-04-22T07:32:30.963Z"}],"details":{"listingId":"d568d652-91ae-4551-9eee-57508683cc4a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/122 \\\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":"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 x402 challenge for /api/v1/messages/122 requires maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/122"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time crypto token quotes and gas estimates without an API key","Running sentiment analysis or text summarization on demand with per-call USDC payments","Fetching exchange rates or price feeds for financial applications","Geocoding addresses or validating data via utility endpoints","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost micro-transaction APIs without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that benefit from bulk pricing or SLAs","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.801Z"},"updatedAt":"2026-04-22T07:32:30.963Z"}}