{"id":"d910d9d0-85ce-4472-a980-73f5f70bbd41","shortId":"4PqnU4","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — 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 across four 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 priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/transfers/169` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base. Payment is made via the x402 protocol with no API keys, no rate limits, and no upfront commitments required. The platform accepts POST requests and returns JSON responses.\n\nDocumentation is extremely sparse — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The exact functionality behind the `/api/v1/transfers/169` path is unclear; the name \"Premium API Access\" is generic and does not describe what data or service is returned.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee","402 payment api"],"warnings":["Documentation pages (docs, pricing, API, README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available for any endpoint","The specific function of /api/v1/transfers/169 ('Premium API Access') is not described anywhere","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/169","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/169","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, confirming it works. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/transfers/169 is unclear. The listing is largely a 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'/request':19,38 '0.02':18,37,99,134 '000':129 '20':128 '402':123 '402 payment api' 'accept':159 'access':119,216 'across':58 'ai':12,31,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,118,147,173,215 'base':8,27,107,130,137 'base usdc api' 'behind':206 'broad':50 'call':4,23 'catalog':51 'categori':60 'challeng':124 'classif':75 'classification' 'commit':155 'connect':181 'content':187 'convers':92 'data':11,30,61,65,224 'data-analytics' 'describ':222 'detail':198 'doc':171 'document':166,199 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,111,202 'estim':86 'exact':204 'exampl':195 'exchang':81 'export':66 'extrem':168 'feed':80 'financ':13,32,77 'finance-data' 'four':59 'function':205 'gas':85 'generat':93 'generic':218 'geocod':90 'geocoding' 'infrastructur':88 'insight':67 'json':164 'key':148 'learn':70 'limit':151 'list':115 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':140 'metric':63 'micropayment api' 'name':213 'network':108 'no-api-key' 'offer':48 'openapi':191 'page':176 'paid':102 'path':209 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':138 'per':3,22,55,100 'platform':6,25,46,158 'post':160 'premium':117,214 'price':79,97,172 'prompt':183 'protocol':144 'quot':84 'rate':82,150 'readm':175 'render':178 'report':64 'request':56,101,125,161 'request/response':194 'requir':156 'respons':165 'return':121,163,228 'schema':192 'sentiment':71 'sentiment-analysis' 'servic':226 'spars':169 'specif':110 'substant':186 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':211 'unit':131 'upfront':154 'usd':135 'usdc':104,133 'usdc-base' 'util':15,34,89 'utility-apis' 'valid':91 'via':9,28,141 'wallet':182 'web3':78 'x402':10,29,43,143 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"fb2035a3-ed90-4123-aa9a-b49b3115d14b","listingId":"d910d9d0-85ce-4472-a980-73f5f70bbd41","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/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:37.399Z"}],"sources":[{"listingId":"d910d9d0-85ce-4472-a980-73f5f70bbd41","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/169","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:37.399Z","lastSeenAt":"2026-04-22T15:02:24.409Z"}],"details":{"listingId":"d910d9d0-85ce-4472-a980-73f5f70bbd41","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/169 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"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 x402 challenge for /api/v1/transfers/169 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/169"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing quick access to diverse API categories without signup"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads where per-request pricing may not be cost-effective","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.571Z"},"updatedAt":"2026-04-22T15:02:24.409Z"}}