{"id":"e35ce8cf-ee15-408b-9da3-5bfea272f5f5","shortId":"wsyDBR","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 variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/184` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. The broader platform advertises additional endpoint categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more — all at the same $0.02 per call.\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 for any endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational, but without documentation it is unclear what input the `/api/v1/transfers/184` endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","serverless API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats for any endpoint","The specific purpose of /api/v1/transfers/184 ('Premium API Access') is unclear — it may be a generic or placeholder endpoint","Cannot verify what data or functionality any of the advertised endpoints actually provide"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/184","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/transfers/184","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 well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only a wallet-connect prompt. The purpose of the specific '/transfers/184' endpoint is unknown beyond its generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,63,122,162 '000':111 '0x8335':116 '20':110 '2913':117 '6':126 'Base network API' 'USDC API' 'accept':130 'access':101 'addit':140 'advertis':106,139 'ai-inference' 'ai/ml':48 'analysi':145 'analyt':47 'api':5,20,37,73,100,171 'application/json':135 'attach':83 'base':8,23,70,112,119 'base-network' 'broader':137 'call':4,19,164 'caller':81 'categori':142 'challeng':105,204 'classif':148 'classification' 'confirm':211 'connect':180 'content':186 'data':46,51 'data-analytics' 'decim':127 'detail':197 'doc':170 'document':165,198,218 'embed':149 'embeddings' 'enabl':36 'endpoint':44,56,93,129,141,201,213,226 'equal':121 'exampl':194 'exchang':152 'expect':227 'extrem':167 'feed':151 'finance-data' 'finance/web3':50 'form':210 'geocod':154 'geocoding' 'given':123 'header':87 'includ':143 'infer':49 'infrastructur':53 'input':223 'key':74 'limit':76 'list':97 'live':206 'low payment fee' 'lowpaymentfee.com':31 'maxamountrequir':108 'micropayment API' 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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/transfers/184","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:42.785Z"}],"sources":[{"listingId":"e35ce8cf-ee15-408b-9da3-5bfea272f5f5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/184","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:42.785Z","lastSeenAt":"2026-04-22T08:31:50.531Z"}],"details":{"listingId":"e35ce8cf-ee15-408b-9da3-5bfea272f5f5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/184 \\\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, rate limits, or minimums","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/transfers/184"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, 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":["Agent-driven API calls with automatic per-request USDC micropayments","Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching financial data (prices, exchange rates, gas estimates) on a pay-as-you-go basis","Utility operations (geocoding, validation, conversion) with no subscription commitment"],"bestFor":["Developers or agents wanting frictionless pay-per-call API access without signup","Crypto-native workflows that can settle in USDC on Base","Low-volume or bursty usage patterns where subscriptions are wasteful"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integration","High-volume production workloads where per-call pricing at $0.02 may be expensive compared to bulk plans","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.316Z"},"updatedAt":"2026-04-22T08:31:50.531Z"}}