{"id":"55a9c064-7f5c-476c-be8f-cd4d30ef9df1","shortId":"bK6WLc","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utility endpoints at $0.02/request.","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 infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header to each request.\n\nThe specific endpoint at `/api/v1/payments/123` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The platform also advertises sibling 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.\n\nDocumentation is extremely thin: 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 crawl. The actual behavior and response format of each endpoint must be discovered by making paid calls.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per request api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) are all empty beyond a 'Connect wallet' prompt — no usable docs available.","No OpenAPI or schema definition found; request and response formats are unknown.","The specific endpoint /api/v1/payments/123 is labeled 'Premium API Access' but its actual functionality is undocumented and unclear.","The broad catalog of endpoints (AI, finance, analytics, utils) is advertised on the landing page but none have documented input/output schemas."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/123","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/123","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages render only 'Connect wallet' with no useful content. The actual functionality behind 'Premium API Access' at /api/v1/payments/123 is unclear, and no examples 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'/api/v1/payments/123':111 '/docs':175 '/pricing':176 '/readme':179 '/request':19,38 '0.02':18,37,69,133,167 '000':127 '20':126 '402':121 '402 payment api' 'access':117 'actual':210 'advertis':139 'ai':12,31 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':57 'also':138 'analysi':144 'analyt':11,30,56 'api':5,24,45,87,116 'attach':98 'avail':205 'base':8,27,77,128,135 'base network api' 'behavior':211 'broad':50 'call':4,23,224 'caller':96 'catalog':51 'challeng':122 'classif':147 'commit':95 'connect':185 'content':191 'convers':159 'conversion' 'cover':10,29 'crawl':208 'data':55,60,161 'data-analytics' 'discov':220 'document':170,200 'embed':148 'enabl':44 'endpoint':16,35,53,65,109,141,217 'estim':156 'everi':64 'exampl':204 'exchang':151 'exchange-rates' 'extrem':172 'feed':150 'financ':13,32 'finance/web3':59 'format':214 'gas':155 'gas-estimates' 'generat':162 'geocod':157 'geocoding' 'header':103 'i.e':132 'infer':58 'infrastructur':62 'key':88 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'x402-payment'","prices":[{"id":"39b4a996-5aa1-4f54-9d55-51c9b89edf5b","listingId":"55a9c064-7f5c-476c-be8f-cd4d30ef9df1","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/payments/123","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:29.911Z"}],"sources":[{"listingId":"55a9c064-7f5c-476c-be8f-cd4d30ef9df1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/123","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:29.911Z","lastSeenAt":"2026-04-22T16:31:31.210Z"}],"details":{"listingId":"55a9c064-7f5c-476c-be8f-cd4d30ef9df1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/123 \\\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, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/123"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying real-time financial price feeds and exchange rates without an API key","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Geocoding addresses or validating data via utility endpoints","Exporting analytics data or generating insights reports","Fetching gas estimates and token quotes for Web3 applications"],"bestFor":["Agents or developers who want instant, keyless API access paid per call","Low-volume or sporadic usage where subscriptions are wasteful","x402-compatible agents that can settle USDC on Base automatically"],"notFor":["High-volume production workloads where per-call pricing adds up quickly","Users who need detailed API documentation or guaranteed SLAs before integrating","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.686Z"},"updatedAt":"2026-04-22T16:31:31.210Z"}}