{"id":"99c2b405-d224-4d77-b8c5-4b8bdd32f1c4","shortId":"xshhJu","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 infrastructure 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/74` is listed as \"Premium API Access\" and follows the same x402 payment pattern. Its exact functionality is not documented beyond the generic title; it may be a messaging or content-retrieval endpoint, but the crawl material does not clarify this. The x402 challenge confirms it is live, accepts POST requests, and requires up to 20,000 base-unit USDC (i.e., $0.02) per call.\n\nThe broader platform advertises endpoints in four 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 were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","analytics-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","data-export"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","402 payment api"],"warnings":["The exact functionality of /api/v1/messages/74 is unknown — 'Premium API Access' is the only description available.","No OpenAPI spec, request schema, or response schema found for any endpoint on the platform.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful documentation.","Cannot verify that the advertised AI, finance, and analytics endpoints actually return meaningful data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/74","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/74","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 confirms pricing and payment details, but there is no OpenAPI schema, no request/response documentation, and the specific endpoint's purpose ('Premium API Access' at /api/v1/messages/74) is entirely undocumented. The broader site lists many endpoints but provides no schemas or examples for any of 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'/request':18,36 '0.02':17,35,68,167,214 '000':161 '20':160 '402 payment api' 'accept':153 'access':110 'advertis':173 'ai':12,30,185 'ai-inference' 'ai/ml':55 'analysi':189 'analyt':11,29,54,179 'analytics-api' 'api':5,23,43,81,109 'attach':92 'base':8,26,76,163 'base network api' 'base-unit':162 'beyond':124 'broad':48 'broader':171 'call':4,22,169 'caller':90 'categori':177 'challeng':148 'cheap api' 'clarifi':144 'classif':192 'classification' 'collect':49 'commit':89 'confirm':149 'content':135 'content-retriev':134 'convers':208 'cover':10,28 'crawl':140,229 'crypto-quotes' 'data':53,58,178,182 'data-export' 'detail':219 'document':123,221 'embed':193 'embeddings' 'enabl':42 'endpoint':51,64,102,137,174 'estim':203 'everi':63 'exact':119 'exampl':224 'exchang':198 'export':183 'feed':197 'financ':13,31,194 'finance-data' 'finance/web3':57 'follow':112 'found':226 'four':176 'function':120 'gas':202 'general':60 'generat':209 'generic':126 'geocod':206 'geocoding' 'header':96 'i.e':166 'infer':56 'infrastructur':61,205 'insight':184 'key':82 'learn':187 'limit':85 'list':106 'live':152 'low payment fee' 'lowpaymentfee.com':37 'machin':186 'materi':141 'may':129 'messag':132 'metric':180 'micropayment api' 'minimum':88 'network':77 'offer':46 'openapi':217 'pattern':117 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':95,116 'per':3,21,69,168 'platform':44,172 'post':154 'premium':108 'price':66,196,215 'quot':201 'rate':84,199 'report':181 'request':70,99,155 'request/response':220 'requir':157 'retriev':136 'schema':218 'sentiment':188 'sentiment-analysis' 'settl':71 'share':211 'simpli':91 'span':52 'specif':101 'suit':6,24 'summar':191 'text':190 'text-summarization' 'titl':127 'token':200 'unit':164 'usag':223 'usdc':9,27,73,165 'usdc api' 'usdc-base' 'util':15,33,62 'valid':207 'web3':195 'x402':41,94,115,147 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"c8de3ade-2e87-43e3-8a1f-e2493b7d44f4","listingId":"99c2b405-d224-4d77-b8c5-4b8bdd32f1c4","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.843Z"}],"sources":[{"listingId":"99c2b405-d224-4d77-b8c5-4b8bdd32f1c4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.843Z","lastSeenAt":"2026-04-22T02:32:07.858Z"}],"details":{"listingId":"99c2b405-d224-4d77-b8c5-4b8bdd32f1c4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/74 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/messages/74","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge returns 402 with maxAmountRequired 20000 USDC (6 decimals = $0.02) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/74"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running AI inference tasks (sentiment, summarization, classification, embeddings) without API key management","Exporting analytics data or generating insights on demand","Geocoding addresses or validating/converting data via utility endpoints"],"bestFor":["Agents or bots that need keyless, pay-as-you-go API access","Developers prototyping with low-cost, no-commitment endpoints","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime documentation","Users who need detailed API documentation, schemas, or response guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.31Z"},"updatedAt":"2026-04-22T02:32:07.858Z"}}