{"id":"f474b559-90b1-4909-9e04-6943fac6e133","shortId":"9Hyvnm","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/customers/54` is listed as \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four main categories of APIs: 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 utilities (geocoding, validation, conversion, generation). All endpoints use the x402 payment protocol, settling in USDC (contract `0x8335...2913`) on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The x402 challenge for this specific endpoint shows a `maxAmountRequired` of 20000 base units, which at 6 decimals for USDC equals $0.02, consistent with the advertised pricing.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-billing","json-api","no-api-key","data-analytics","ai-inference","finance-data","web3-data","geocoding","text-summarization","sentiment-analysis","embeddings"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","no-auth api"],"warnings":["No OpenAPI or schema documentation available — all doc pages render only 'Connect wallet'","The specific endpoint /api/v1/customers/54 has no documented request body format or response schema","No request or response examples could be found anywhere in the crawl","The broad catalog of endpoints (AI, finance, analytics, utils) is advertised but none have detailed docs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/54","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/customers/54","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 per call on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of the specific `/api/v1/customers/54` endpoint is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,59,211 '0x8335':148 '20000':201 '2913':149 '6':206 'access':90 'advertis':98,215 'ai':111 'ai-inference' 'ai/ml':49 'analysi':115 'analyt':48,105 'api':5,20,37,71,89,103,158 'application/json':93 'avail':186 'base':8,23,67,151,202 'base network api' 'broad':42 'call':4,19 'catalog':43 'categori':101 'challeng':192 'classif':118 'commit':78 'connect':167 'consist':212 'content':173 'contract':147 'convers':135 'cost':58 'crawl':189 'data':47,52,104,108 'data-analytics' 'decim':207 'detail':184 'doc':157 'document':152,185 'embed':119 'embeddings' 'enabl':36 'endpoint':45,57,82,138,196 'equal':210 'estim':129 'everi':56 'exampl':181 'exchang':124 'export':109 'extrem':154 'feed':123 'financ':120 'finance-data' 'finance/web3':51 'four':99 'gas':128 'generat':136 'geocod':133 'geocoding' 'infer':50 'infrastructur':131 'insight':110 'json-api' 'key':72 'learn':113 'limit':75 'list':86 'low payment fee' 'lowpaymentfee.com':31 'machin':112 'main':100 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'x402-payment'","prices":[{"id":"737ed010-acfe-4745-9ba8-8e7ffa37e3c8","listingId":"f474b559-90b1-4909-9e04-6943fac6e133","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/customers/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:54.718Z"}],"sources":[{"listingId":"f474b559-90b1-4909-9e04-6943fac6e133","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:54.718Z","lastSeenAt":"2026-04-22T21:30:31.000Z"}],"details":{"listingId":"f474b559-90b1-4909-9e04-6943fac6e133","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/54 \\\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 cost $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 in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/54"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) on a pay-per-call basis without API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running data analytics queries and exporting reports via simple HTTP POST calls","Using utility services like geocoding, validation, and data conversion"],"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 micropayment-gated API calls without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput batch processing with volume discounts","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.407Z"},"updatedAt":"2026-04-22T21:30:31.000Z"}}