{"id":"8d9fab70-4c11-443b-b8c5-84ee451dba3b","shortId":"NK2t72","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that provides a broad catalog of pay-per-request endpoints across 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint `/api/v1/trades/147` 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. Payment is made via the x402 exact scheme with no API keys or rate limits required. The platform advertises instant access with no minimums or commitments.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The specific purpose of `/api/v1/trades/147` (the \"147\" path parameter) is unclear from available materials; it may represent a specific trade record or resource, but this is not documented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","price-feeds","exchange-rates","gas-estimates","geocoding","validation"],"categories":["data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","crypto pay api","serverless api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition provided for any endpoint","The specific resource /api/v1/trades/147 is not described on the landing page; its purpose and expected input/output are unknown","The platform lists many endpoints but none have documented request/response formats"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/147","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/trades/147","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 (all doc pages show only 'Connect wallet'), there is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/trades/147 is undocumented. The listing is effectively a stub with pricing info 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'/api/v1/trades/147':108,203 '/docs':167 '/pricing':169 '/readme':171 '/request':17,34 '0.02':16,33,95,135 '000':124 '0x8335':129 '147':205 '20':123 '2913':130 '402':118 'access':114,156 'across':54 'advertis':154 'ai':10,27,64 'ai-inference' 'analysi':68 'analyt':58 'api':4,21,41,113,146 'avail':211 'base':7,24,103,125,132 'base network api' 'broad':46 'catalog':47 'categori':56 'challeng':119 'classif':71 'classification' 'commit':161 'connect':177 'content':183 'convers':88 'crypto pay api' 'data':9,26,57,61 'data-analytics' 'detail':194 'document':162,195,226 'embed':72 'embeddings' 'endpoint':14,31,53,91,107,198 'equal':134 'estim':82 'exact':142 'exampl':191 'exchang':77 'exchange-rates' 'export':62 'extrem':164 'feed':76 'financ':11,28,73 'finance-data' 'four':55 'gas':81 'gas-estimates' 'gate':3,20 'generat':89 'geocod':86 'geocoding' 'infrastructur':84 'insight':63 'instant':155 'key':147 'learn':66 'limit':150 'list':110 'low payment fee' 'lowpaymentfee.com':35 'machin':65 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'x402-protocol':38","prices":[{"id":"aa3fb732-6400-44e5-8198-e6ce09d38474","listingId":"8d9fab70-4c11-443b-b8c5-84ee451dba3b","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/trades/147","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:35.230Z"}],"sources":[{"listingId":"8d9fab70-4c11-443b-b8c5-84ee451dba3b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/147","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:35.230Z","lastSeenAt":"2026-04-23T08:01:51.768Z"}],"details":{"listingId":"8d9fab70-4c11-443b-b8c5-84ee451dba3b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/147 \\\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 are 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":"The x402 challenge for /api/v1/trades/147 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/147"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-request payment basis","Accessing utility services like geocoding and data validation via micropayments","Integrating agent-driven workflows that pay per call using x402 on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost micropayment-gated endpoints without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.407Z"},"updatedAt":"2026-04-23T08:01:51.768Z"}}