{"id":"32047c9e-5287-487a-8bfd-981093111728","shortId":"NJBDSJ","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, 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, paid in USDC on the Base network. The x402 protocol means there are no API keys, no accounts, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/297` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe 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. However, documentation beyond the landing page is extremely sparse; the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base-network","no-api-key","json-response","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto-paid API"],"warnings":["Documentation pages (docs, pricing, API, README) are all empty beyond a 'Connect wallet' prompt — no technical details available.","No OpenAPI or schema documentation exists for any endpoint.","The specific functionality of /api/v1/payments/297 ('Premium API Access') is not described anywhere — it is unclear what data or service it returns.","The broader platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented request/response formats."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/297","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/payments/297","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — docs/pricing/API/README pages all show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The purpose of this specific '/payments/297' endpoint beyond 'Premium API Access' is 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'/request':13,32 '0.02':12,31,72,137,191 '000':126 '0x8335':131 '20':125 '2913':132 '300':150 '402':120 '402 payment API' '6':141 'Base network API' 'USDC micropayment API' 'accept':155 'access':116 'account':92 'across':58 'advertis':164 'ai/ml':61 'analysi':168 'analyt':60 'api':5,17,24,36,45,89,115,205 'application/json':160 'attach':99 'avail':235 'base':8,27,80,127,134 'beyond':196 'broad':50 'broader':162 'call':4,23 'caller':97 'catalog':51 'challeng':121 'classif':171 'connect':214 'content':239 'convers':183 'crawl':238 'crypto-paid API' 'data':59,185 'decim':142 'detail':221 'doc':204 'document':195,230 'embed':172 'enabl':44 'endpoint':57,68,108,154,165 'equal':136 'estim':180 'exact':147 'exampl':234 'exchang':175 'extrem':201 'feed':174 'finance/web3':63 'gas':179 'generat':186 'geocod':181 'given':138 'header':102 'howev':194 'http-post' 'infer':62 'infrastructur':65 'json-response' 'key':18,37,90 'land':198 'limit':96 'list':112 'lowpaymentfee' 'lowpaymentfee.com':39 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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/payments/297","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:09.986Z"}],"sources":[{"listingId":"32047c9e-5287-487a-8bfd-981093111728","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/297","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:09.986Z","lastSeenAt":"2026-04-24T05:32:17.818Z"}],"details":{"listingId":"32047c9e-5287-487a-8bfd-981093111728","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/297 \\\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, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/297"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API endpoints without creating accounts or managing API keys","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need frictionless, key-free API access"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that need to autonomously purchase API calls via x402","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.855Z"},"updatedAt":"2026-04-24T05:32:17.818Z"}}