{"id":"bb9d295e-61a8-44e5-9344-9091f8723f5a","shortId":"RGnu4E","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 broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/172` is listed as \"Premium API Access\" and advertises a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The x402 challenge confirms the endpoint is live, accepts POST requests, and returns application/json. However, there is no documentation describing what this particular transfers endpoint does — the site's landing page lists categories like analytics, AI, finance, and utilities, but `/api/v1/transfers/172` does not appear among them.\n\nThe platform's crawled docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content, so detailed request/response schemas, parameter descriptions, and example payloads are unavailable. The endpoint is confirmed live via its 402 challenge, but its actual functionality remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-endpoint"],"categories":["api-platform","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["The endpoint /api/v1/transfers/172 is not listed among the site's advertised APIs — its actual functionality is unknown.","All documentation pages (docs, api, pricing, README) rendered only a 'Connect wallet' prompt with no usable content.","No request or response schema is available; callers cannot know what parameters to send or what to expect back.","The generic title 'Premium API Access' provides no indication of the endpoint's purpose."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/172","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/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint's purpose is undocumented. No request/response schema, no examples, and all doc pages rendered only a wallet-connect prompt. The endpoint path '/api/v1/transfers/172' does not match any listed API on the landing page, making its function 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'/request':13,28 '0.02':12,27,64,121 '000':110 '0x8335':115 '20':109 '2913':116 '402':211 '6':125 'Base network API' 'USDC micropayment API' 'accept':135 'access':102 'across':46 'actual':215 'advertis':104 'ai':162 'ai/ml':49 'among':171 'analyt':48,161 'api':5,20,37,74,101,180 'appear':170 'application/json':140 'attach':84 'base':8,23,71,111,118 'broad':42 'call':4,19 'caller':82 'categori':159 'challeng':129,212 'confirm':130,207 'connect':186 'content':192 'crawl':176 'data':47,52 'decim':126 'describ':146 'descript':198 'detail':194 'doc':177 'document':145 'enabl':36 'endpoint':45,57,94,132,151,205 'equal':120 'exampl':200 'financ':163 'finance/web3':51 'function':216 'given':122 'header':88 'howev':141 'infer':50 'json-response' 'key':75 'land':156 'like':160 'limit':77 'list':98,158 'live':134,208 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':106 'network':9,24,72 'no-api-key' 'offer':40 'page':157,181 'paramet':197 'particular':149 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payload':201 'payment':87,107 'per':3,18,61 'platform':6,21,38,174 'post':136 'post-endpoint' 'premium':100 'price':178 'prompt':188 'rate':76 'remain':217 'render':183 'request':62,91,137 'request/response':195 'requir':81 'return':139 'schema':196 'servic':55 'set':43 'settl':66 'simpli':83 'site':154 'specif':93 'subscript':79 'transfer':150 'unavail':203 'unclear':218 'unit':112 'usdc':15,30,68,114,123 'usdc-base' 'util':54,165 'via':10,25,209 'wallet':187 'x402':11,26,35,86,128 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"997cd350-e36a-4e7d-a6d8-b44ed617fd03","listingId":"bb9d295e-61a8-44e5-9344-9091f8723f5a","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/172","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:37.976Z"}],"sources":[{"listingId":"bb9d295e-61a8-44e5-9344-9091f8723f5a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/172","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:37.976Z","lastSeenAt":"2026-04-22T04:02:11.444Z"}],"details":{"listingId":"bb9d295e-61a8-44e5-9344-9091f8723f5a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/172 \\\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, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/172"},{"claim":"Site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API services without subscription or API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Integrating pay-per-use data or utility endpoints into automated pipelines"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.57Z"},"updatedAt":"2026-04-22T04:02:11.444Z"}}