{"id":"1b6c75e5-ccd3-4041-ade4-52d6dd8c032a","shortId":"VxFMen","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, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/accounts/129` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises 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. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality and response schemas for these endpoints remain unverified.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method","premium-api-access"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["Documentation pages (/docs, /pricing, /README) return no useful content — only a 'Connect wallet' prompt.","No OpenAPI or schema available; request and response formats for this endpoint are unknown.","The specific functionality of /api/v1/accounts/129 ('Premium API Access') is not described anywhere — it is unclear what data or service it provides.","The broader platform lists many endpoint categories (AI, finance, etc.) but none are verified beyond their landing page listing."],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/129","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/accounts/129","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 pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are empty stubs. The purpose of the specific /accounts/129 endpoint is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,62,114,170 '000':103 '0x8335':108 '20':102 '2913':109 '300':130 '402':97 '6':118 'accept':135 'access':93 'across':45 'actual':191 'advertis':144 'ai':48 'analysi':148 'analyt':47 'api':5,20,37,74,92 'application/json':140 'base':8,23,70,104,111 'base network api' 'broader':142 'call':4,19 'categori':56 'challeng':98 'classif':151 'commit':81 'connect':182 'content':188 'convers':163 'data':46 'decim':119 'doc':176 'document':174 'embed':152 'enabl':36 'endpoint':44,58,85,134,145,198 'equal':113 'estim':160 'exact':126 'exchang':155 'feed':154 'financ':51 'function':192 'gas':159 'generat':165 'geocod':161 'given':115 'howev':173 'infrastructur':54 'json-response' 'key':75 'learn':50 'limit':78 'list':89 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'made':122 'micropayment api' 'network':9,24,71 'no-api-key' 'offer':40 'page':175 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':65 'payment':120 'per':3,18,63 'platform':6,21,38,143 'point':172 'post':136 'post-method' 'premium':91 'premium-api-access' 'price':60,153,171,177 'prompt':184 'quot':158 'rate':77,156 'readm':178 'remain':199 'request':64,99,137 'requir':82 'respons':194 'return':95,139,179 'schema':195 'scheme':127 'second':131 'sentiment':147 'specif':84 'substant':187 'summar':150 'text':149 'timeout':132 'token':157 'unit':105 'unverifi':200 'usdc':15,30,67,107,116 'usdc api' 'usdc-base-network' 'util':55 'valid':162 'varieti':42 'via':10,25,123 'wallet':183 'web3':52 'x402':11,26,35,125 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"41dd9d1a-eadc-4b26-bee1-21087ceb6983","listingId":"1b6c75e5-ccd3-4041-ade4-52d6dd8c032a","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/accounts/129","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:57.559Z"}],"sources":[{"listingId":"1b6c75e5-ccd3-4041-ade4-52d6dd8c032a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/129","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:57.559Z","lastSeenAt":"2026-04-24T18:32:15.100Z"}],"details":{"listingId":"1b6c75e5-ccd3-4041-ade4-52d6dd8c032a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/129 \\\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 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 with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/accounts/129"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol","Agents needing keyless API access with crypto micropayments","Projects already operating on the Base L2 network"],"notFor":["Users who need detailed API documentation or response schemas before purchasing","Applications requiring free or fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:34.604Z"},"updatedAt":"2026-04-24T18:32:15.100Z"}}