{"id":"ca410448-1eb9-4d45-b72d-43c0e6ae8f4b","shortId":"yNTCCu","kind":"x402","title":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API platform on Base (USDC) via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network. The x402 protocol eliminates the need for API keys, accounts, or subscriptions — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/orders/83` is listed as \"Premium API Access\" and requires a POST request with an x402 payment of up to 20,000 base units of USDC (0.02 USDC = $0.02) on Base. The response is JSON. The platform advertises no rate limits and instant access.\n\nThe broader platform includes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export. Documentation pages exist but appear to require wallet connection and contain no visible technical detail, so the actual behavior and schemas of individual endpoints remain unclear beyond what the x402 challenge reveals.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered empirically","Documentation pages (/docs, /pricing, /README) are empty beyond a wallet-connect prompt","The specific endpoint path '/api/v1/orders/83' is not listed on the homepage catalog; its purpose is unclear","No example request or response bodies are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/83","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/orders/83","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 captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a landing page, no example request/response bodies, and the purpose of the specific '/api/v1/orders/83' path is entirely opaque. The docs, pricing, and README pages all render only a 'Connect wallet' prompt with no useful 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'/call':13,30 '0.02':12,29,68,128,130 '000':123 '20':122 '402 payment api' 'access':109,145 'account':87 'across':54 'actual':185 'advertis':139 'ai/ml':57 'analysi':153 'analyt':56 'api':5,15,22,32,41,85,108 'appear':172 'attach':92 'base':8,25,76,124,132 'base network api' 'behavior':186 'beyond':194 'broad':46 'broader':147 'caller':90 'catalog':47 'challeng':198 'classif':156 'connect':176 'contain':178 'convers':164 'data':55,166 'detail':182 'document':168 'elimin':81 'embed':157 'enabl':40 'endpoint':53,64,101,150,191 'exchang':160 'exist':170 'export':167 'feed':159 'finance/web3':59 'geocod':162 'header':95 'includ':149 'individu':190 'infer':58 'infrastructur':61 'instant':144 'json':136 'json-api' 'key':16,33,86 'limit':142 'list':105 'low payment fee' 'lowpaymentfee.com':35 'micropayment api' 'need':83 'network':77 'no-api-key' 'offer':44 'page':169 'pay':2,19,50 'pay per call api' 'pay-per-request':1,18,49 'payment':94,118 'per':3,20,51,69 'platform':6,23,42,138,148 'post':113 'post-method' 'premium':107 'price':66,158 'protocol':80 'rate':141,161 'remain':192 'request':4,21,52,70,98,114 'requir':17,34,111,174 'respons':134 'reveal':199 'schema':188 'sentiment':152 'settl':71 'simpli':91 'specif':100 'subscript':89 'summar':155 'technic':181 'text':154 'unclear':193 'unit':125 'usdc':9,26,73,127,129 'usdc api' 'usdc-base' 'util':62 'valid':163 'via':10,27 'visibl':180 'wallet':175 'x402':11,28,39,79,117,197 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"2c95fad9-225c-405d-80be-907c54bb009d","listingId":"ca410448-1eb9-4d45-b72d-43c0e6ae8f4b","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/orders/83","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:47.612Z"}],"sources":[{"listingId":"ca410448-1eb9-4d45-b72d-43c0e6ae8f4b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/83","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:47.612Z","lastSeenAt":"2026-04-25T04:02:28.577Z"}],"details":{"listingId":"ca410448-1eb9-4d45-b72d-43c0e6ae8f4b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/83 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/83"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-initiated API calls with automatic per-request USDC micropayments","Accessing analytics, AI inference, or financial data without managing API keys","Programmatic pay-as-you-go access to utility endpoints like geocoding or validation"],"bestFor":["Developers or agents wanting zero-signup, pay-per-use API access","x402-compatible clients on the Base network","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["High-volume consumers needing bulk pricing or rate guarantees","Users without USDC on Base or an x402-compatible payment client","Anyone needing detailed API documentation or OpenAPI schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.687Z"},"updatedAt":"2026-04-25T04:02:28.577Z"}}