{"id":"34624846-8eed-4ebd-9b21-c1303e034d40","shortId":"SMTBwN","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transfers/198` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint 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 listed at the same $0.02 per request price point.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The specific functionality behind the `/api/v1/transfers/198` path is unclear; the name \"Premium API Access\" and the path segment \"transfers\" suggest it may relate to a transfer or transaction operation, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no technical content","The specific functionality of /api/v1/transfers/198 ('Premium API Access') is unclear — the path suggests a transfer operation but no details are provided","Cannot verify what data or service is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/198","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/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/transfers/198 is ambiguous. Effectively a stub 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'/api/v1/transfers/198':69,219 '/docs':178 '/pricing':179 '/readme':182 '/request':19,38 '0.02':18,37,80,168 '000':84 '20':83 '6':90 'Base network API' 'USDC API' 'access':75,227 'account':102 'advertis':124 'ai':12,31,135 'ai-inference' 'analysi':139 'analyt':129 'api':5,24,45,74,100,226 'attach':110 'avail':209,249 'base':8,27,63,85 'base-network' 'behind':217 'broad':50 'call':4,23,82 'caller':108 'cannot':245 'catalog':51 'categori':127 'classif':142 'confirm':247 'connect':188 'content':213 'convers':159 'cost':77 'cover':10,29 'crawl':212 'crypto-paid API' 'data':11,30,128,132 'data-analytics' 'decim':91 'detail':195 'document':173,204 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,162 'estim':153 'exampl':208 'exchang':148 'export':133 'extrem':175 'feed':147 'financ':13,32,144 'finance-data' 'four':125 'function':216 'gas':152 'generat':160 'geocod':157 'handl':94 'header':115 'infrastructur':155 'insight':134 'key':101 'learn':137 'limit':105 'list':71,164 'lowpaymentfee' 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'x402-payment'","prices":[{"id":"76e487e5-7c8a-44bf-8b3f-812feaacb4c4","listingId":"34624846-8eed-4ebd-9b21-c1303e034d40","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/transfers/198","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:43.997Z"}],"sources":[{"listingId":"34624846-8eed-4ebd-9b21-c1303e034d40","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/198","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:43.997Z","lastSeenAt":"2026-04-23T00:32:30.342Z"}],"details":{"listingId":"34624846-8eed-4ebd-9b21-c1303e034d40","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/198 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/198"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/198"}],"useCases":["Accessing data analytics and reports without needing an API key or subscription","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis","Fetching real-time financial data such as price feeds, exchange rates, and gas estimates","Using utility services like geocoding, validation, and data conversion with instant crypto payment"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle payments in USDC on Base via x402","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.217Z"},"updatedAt":"2026-04-23T00:32:30.342Z"}}