{"id":"041afe58-3a95-4e16-816f-437222054e89","shortId":"swrxa9","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/payments/48` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform advertises a uniform $0.02/request price across all its endpoints, which include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body the POST endpoint expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-endpoint","no-api-key","no-rate-limits"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/payments/48 ('Premium API Access') is not explained anywhere","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/48","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The docs pages are empty. The purpose of this specific /payments/48 endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/payments/48':95 '/docs':169 '/pricing':170 '/readme':173 '/request':19,38,140 '0.02':18,37,126,139 '000':115 '0x8335':120 '20':114 '2913':121 '402':212 '6':131 'Base network API' 'USDC API' 'accept':103 'access':101 'across':142 'advertis':136 'ai':12,31 'ai/ml':56 'analysi':149 'analyt':55 'api':5,24,45,82,100 'avail':199 'base':8,27,75,116,123 'bodi':222 'broader':134 'call':4,23,128 'challeng':108,213 'classif':152 'collect':50 'confirm':207 'connect':179 'content':185 'convers':160 'cost':112 'crawl':202 'data':11,30,54,59,162 'decim':132 'document':164,194,216 'embed':153 'enabl':44 'endpoint':16,35,52,65,93,145,205,225 'equal':125 'exampl':198 'exchang':156 'expect':226 'export':163 'extrem':166 'feed':155 'financ':13,32 'finance/web3':58 'general':61 'geocod':158 'includ':147 'indic':109 'infer':57 'key':83 'limit':86 'list':97 'live':208 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'materi':203 'maximum':111 'micropayment API' 'network':76 'no-api-key' 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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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:44.657Z"}],"sources":[{"listingId":"041afe58-3a95-4e16-816f-437222054e89","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:44.657Z","lastSeenAt":"2026-04-23T20:32:44.052Z"}],"details":{"listingId":"041afe58-3a95-4e16-816f-437222054e89","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/48 \\\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":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/48"},{"claim":"Platform offers endpoints in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with instant crypto micropayments","Programmatic pay-per-use access without subscription or API key management","Agent-driven API consumption where payment is handled inline via x402"],"bestFor":["Developers wanting zero-friction API access without signup","AI agents that can settle x402 payments autonomously on Base","Users who prefer pay-as-you-go pricing with no commitments"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.176Z"},"updatedAt":"2026-04-23T20:32:44.052Z"}}