{"id":"eb6a241c-9b1e-4f4e-83d3-751915d3d6a8","shortId":"2nQyD6","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transfers/196` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 uniformly priced at $0.02 per request. However, this specific endpoint (`/api/v1/transfers/196`) is labeled generically as \"Premium API Access\" and does not appear in the site's listed API catalog, so its exact functionality is unclear.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 description of what this particular transfer endpoint returns or expects as input.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The exact functionality of /api/v1/transfers/196 is undocumented and unclear — it does not appear in the site's listed API catalog.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no substantive content.","No OpenAPI schema, request format, or response examples are available.","The endpoint path suggests a resource-specific ID (196), which may not be stable or generalizable."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/196","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/196","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 documentation, no OpenAPI schema, no request/response examples, and the specific function of this '/transfers/196' endpoint is unknown. The docs pages are empty beyond a wallet-connect 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'/api/v1/transfers/196':56,169 '/docs':199 '/pricing':201 '/readme':203 '/request':13,28 '0.02':12,27,86,162 '000':76 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':81 '20':75 '6':91 'Base network API' 'USDC micropayment API' 'accept':46,64 'access':62,176 'advertis':118 'ai':130 'analysi':134 'analyt':124 'api':5,20,38,61,94,120,175,186 'appear':180 'attach':103 'base':8,23,51,77,83 'broader':116 'call':4,19 'caller':101 'catalog':187 'categori':121 'challeng':69 'classif':137 'connect':209 'content':215 'convers':154 'cost':73 'crypto-paid endpoint' 'data':123,127 'decim':92 'descript':227 'detail':226 'document':194 'embed':138 'endpoint':55,157,168,233 'equal':85 'estim':148 'exact':190 'exampl':223 'exchang':143 'expect':236 'export':128 'extrem':196 'feed':142 'financ':139 'function':191 'gas':147 'generat':155 'generic':172 'geocod':152 'header':108 'howev':165 'includ':122 'indic':70 'infrastructur':150 'input':238 'insight':129 'key':95 'label':171 'learn':132 'limit':98 'list':58,185 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':131 'maximum':72 'metric':125 'multipl':119 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':219 'page':204 'particular':231 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,107,113 'per':3,18,36,87,163 'platform':6,21,39,117 'post':65 'post-endpoint' 'premium':60,174 'premium API access' 'price':141,160 'prompt':211 'proof':114 'protocol':44 'quot':146 'rate':97,144 'render':206 'report':126 'request':37,66,88,164 'request/response':222 'requir':100 'return':234 'schema':220 'sentiment':133 'simpli':102 'site':183 'spars':197 'specif':54,167 'substant':214 'summar':136 'text':135 'token':145 'transfer':232 'unclear':193 'uniform':159 'unit':78 'usdc':15,30,47,80,89 'usdc-base' 'use':41,90 'util':151 'valid':111,153 'via':10,25 'wallet':210 'web3':140 'x':106 'x-payment':105 'x402':11,26,43,68,112 'x402 API' 'x402-payment'","prices":[{"id":"2570f02c-3bc7-424d-a8bd-eb905a7d8224","listingId":"eb6a241c-9b1e-4f4e-83d3-751915d3d6a8","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/196","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:50.588Z"}],"sources":[{"listingId":"eb6a241c-9b1e-4f4e-83d3-751915d3d6a8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/196","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:50.588Z","lastSeenAt":"2026-04-22T23:02:17.545Z"}],"details":{"listingId":"eb6a241c-9b1e-4f4e-83d3-751915d3d6a8","quickStartSnippet":"# Send a POST with x402 payment header\ncurl -X POST https://lowpaymentfee.com/api/v1/transfers/196 \\\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":"Uniform pricing of $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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/196"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API services without traditional API key registration","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need frictionless pay-as-you-go access"],"bestFor":["Developers who want zero-signup, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet","High-volume consumers who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.914Z"},"updatedAt":"2026-04-22T23:02:17.545Z"}}