{"id":"25deeefa-9ae8-4c5a-bbbc-da927af23007","shortId":"cykD5N","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 suite of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/customers/60` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and 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 purpose of the `/api/v1/customers/60` endpoint specifically is unclear — it could be a demo or sample resource. Callers should expect to experiment to discover the actual request format and response shape.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","metered API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The purpose of /api/v1/customers/60 ('Premium API Access') is unclear — it may be a demo or placeholder resource","No request body schema or response schema is documented; callers must discover the format experimentally"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/60","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/customers/60","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 documented request/response schema, no usage examples, and the docs pages are empty. The specific purpose of /api/v1/customers/60 is unexplained, making this effectively a stub 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'/api/v1/customers/60':106,219 '/docs':181 '/pricing':182 '/readme':185 '/request':19,38 '0.02':18,37,70,138,173 '000':127 '0x8335':132 '20':126 '2913':133 '6':142 'Base network API' 'USDC micropayment API' 'access':112 'actual':240 'advertis':121 'ai':12,31,57 'ai-inference' 'also':146 'amount':124 'analysi':151 'analyt':56 'api':5,24,45,83,111 'application/json':115 'attach':94 'avail':211 'base':8,27,78,128,135 'broad':50 'call':4,23 'caller':92,232 'challeng':120 'classif':154 'commit':91 'connect':191 'content':197 'convers':166 'could':225 'cover':10,29 'crawl':214 'crypto-paid API' 'data':11,30,55 'data-analytics' 'decim':143 'demo':228 'discov':238 'document':176,206 'embed':155 'enabl':44 'endpoint':16,35,53,66,104,148,220 'equal':137 'estim':163 'everi':65 'exampl':210 'exchang':158 'expect':234 'experi':236 'expos':147 'extrem':178 'feed':157 'financ':13,32,60 'finance-data' 'format':242 'gas':162 'generat':168 'geocod':164 'given':139 'header':98 'infrastructur':63 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'x402-payment'","prices":[{"id":"6817404c-2f89-4f1d-be00-497a0576c945","listingId":"25deeefa-9ae8-4c5a-bbbc-da927af23007","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/customers/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:57.722Z"}],"sources":[{"listingId":"25deeefa-9ae8-4c5a-bbbc-da927af23007","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:57.722Z","lastSeenAt":"2026-04-23T17:31:10.521Z"}],"details":{"listingId":"25deeefa-9ae8-4c5a-bbbc-da927af23007","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/60 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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/customers/60"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Exporting data or generating analytics reports with per-request billing"],"bestFor":["Agents or bots that need instant, keyless API access paid per call","Developers prototyping with low-cost, no-commitment endpoints","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads needing SLAs, rate guarantees, or detailed documentation","Users without a Base-compatible wallet or USDC holdings","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.291Z"},"updatedAt":"2026-04-23T17:31:10.521Z"}}