{"id":"a5696141-23f7-4af9-9c99-6c2724e28596","shortId":"whAd5K","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 across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/transfers/39` is listed as \"Premium API Access\" but its exact functionality is not documented in the available crawl material. The broader platform advertises endpoints for metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0.02 USD) on Base to wallet `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.\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 description of what the `/transfers/39` endpoint actually returns. The platform's landing page is the only substantive source of information.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The specific functionality of /api/v1/transfers/39 is not documented anywhere in the crawl material","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","No OpenAPI schema or request/response examples available","The endpoint name 'Premium API Access' is generic and does not describe what it does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/39","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/39","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /transfers/39 is undocumented. The docs pages are empty beyond a wallet connect 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'/request':13,28 '/transfers/39':200 '0.02':12,27,62,157 '000':152 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':163 '20':151 '402 payment api' 'accept':142 'access':91 'across':45 'actual':202 'advertis':107 'ai':48 'analysi':116 'analyt':47 'api':5,20,37,74,90,170 'avail':101 'base':8,23,70,153,160 'base network api' 'broader':105 'call':4,19 'categori':56 'challeng':136 'classif':119 'commit':79 'confirm':137 'connect':179 'content':185 'convers':131 'crawl':102 'data':46,112 'descript':196 'doc':169 'document':98,164 'embed':120 'enabl':36 'endpoint':44,58,83,108,139,201 'estim':128 'exact':94 'exampl':193 'exchang':123 'export':113 'extrem':166 'feed':122 'financ':51 'function':95 'gas':127 'generat':133 'geocod':129 'inform':215 'infrastructur':54 'insight':114 'json-response' 'key':75 'land':207 'learn':50 'limit':77 'list':87 'live':141 'low payment fee' 'lowpaymentfee.com':31 'machin':49 'materi':103 'metric':110 'micropayment api' 'network':9,24,71 'no-api-key' 'offer':40 'openapi':189 'page':174,208 'paid':65 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':147 'per':3,18,63 'platform':6,21,38,106,205 'post':143 'post-method' 'premium':89 'price':60,121,171 'prompt':181 'quot':126 'rate':76,124 'readm':173 'render':176 'report':111 'request':64,144 'request/response':192 'requir':80,146 'return':203 'schema':190 'sentiment':115 'sourc':213 'spars':167 'specif':82 'substant':212 'summar':118 'text':117 'token':125 'unit':154 'usd':158 'usdc':15,30,67,156 'usdc api' 'usdc-base-network' 'util':55 'valid':130 'varieti':42 'via':10,25 'wallet':162,180 'web3':52 'x402':11,26,35,135 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"b0d4e104-caca-4ba4-9008-836aac0200d2","listingId":"a5696141-23f7-4af9-9c99-6c2724e28596","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:47.612Z"}],"sources":[{"listingId":"a5696141-23f7-4af9-9c99-6c2724e28596","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:47.612Z","lastSeenAt":"2026-04-23T00:32:30.497Z"}],"details":{"listingId":"a5696141-23f7-4af9-9c99-6c2724e28596","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/39 \\\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 commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms live endpoint accepting POST with maxAmountRequired of 20000 base units USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/39"},{"claim":"Payment is in USD Coin (USDC) at asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/39"}],"useCases":["Programmatic access to various utility and data endpoints without API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402 payment protocol integration with minimal per-call cost"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-use API access on Base","Low-cost micropayment API consumption"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.06Z"},"updatedAt":"2026-04-23T00:32:30.497Z"}}