{"id":"045361e9-8e5e-4a67-8388-b4248b2b4451","shortId":"Ts2DWm","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/40` 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, no subscriptions, no rate limits. Callers attach an `X-PAYMENT` header with a valid payment proof and receive the response immediately.\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 listed endpoints share the same $0.02/request pricing.\n\nDocumentation beyond the landing page 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 specific functionality of the `/api/v1/transfers/40` endpoint is unclear from the available material; it does not appear in the landing page's catalog of endpoints, so its purpose must be inferred solely from its \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services","json-api"],"categories":["api-platform","finance","llm","geo"],"synonyms":["pay per call API","x402 API","USDC API","micropayment API","Base network API","low fee API","crypto payment API","serverless API"],"warnings":["The specific endpoint /api/v1/transfers/40 does not appear in the site's public catalog — its exact functionality is unknown.","No OpenAPI spec, no request/response schema, and no documentation pages with actual content were found.","All secondary pages (/docs, /pricing, /api, /README) returned only a 'Connect wallet' prompt with no useful information.","The platform advertises many endpoint categories (AI, finance, data, utilities) but none could be verified for actual functionality from the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/40","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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, and the specific purpose of /api/v1/transfers/40 is undocumented. The docs, pricing, and README pages are all empty 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'/api/v1/transfers/40':69,221 '/docs':182 '/pricing':183 '/readme':186 '/request':19,38,171 '0.02':18,37,80,170 '000':84 '20':83 '6':90 'Base network API' 'USDC API' 'access':75,252 'advertis':127 'ai':12,31,138 'ai-inference' 'analysi':142 'analyt':132 'api':5,24,45,74,100,251 'appear':232 'attach':108 'avail':212,227 'base':8,27,63,85 'base-network' 'beyond':174 'broad':50 'call':4,23,82 'caller':107 'catalog':51,238 'categori':130 'classif':145 'connect':192 'content':198 'convers':162 'cost':77 'cover':10,29 'crawl':215 'crypto payment API' 'data':11,30,131,135 'data-analytics' 'decim':91 'document':173,207 'embed':146 'enabl':44 'endpoint':16,35,57,67,129,166,222,240 'estim':156 'exampl':211 'exchang':151 'export':136 'extrem':179 'feed':150 'financ':13,32,147 'finance-data' 'four':128 'function':218 'gas':155 'generat':163 'geocod':160 'handl':94 'header':113 'immedi':123 'infer':246 'infrastructur':158 'insight':137 'json-api' 'key':101 'label':253 'land':176,235 'learn':140 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'x402-payment'","prices":[{"id":"57aa6449-c80a-4ec9-bdfe-f0681fb81479","listingId":"045361e9-8e5e-4a67-8388-b4248b2b4451","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:47.001Z"}],"sources":[{"listingId":"045361e9-8e5e-4a67-8388-b4248b2b4451","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:47.001Z","lastSeenAt":"2026-04-22T15:02:25.192Z"}],"details":{"listingId":"045361e9-8e5e-4a67-8388-b4248b2b4451","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/40 \\\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/40"},{"claim":"All listed 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 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/40"}],"useCases":["Agents that need on-demand access to analytics, AI, or finance data without managing API keys","Programmatic pay-per-use access to sentiment analysis, summarization, or classification models","Fetching real-time price feeds, exchange rates, or gas estimates via crypto micropayments","Geocoding or data validation as a utility service paid per request"],"bestFor":["AI agents and bots that can settle payments via x402 on Base","Developers who want zero-commitment, pay-as-you-go API access","Use cases requiring small, infrequent API calls without subscription overhead"],"notFor":["High-volume production workloads where subscription pricing would be cheaper","Users who need detailed API documentation or SLAs before integrating","Callers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.098Z"},"updatedAt":"2026-04-22T15:02:25.192Z"}}