{"id":"54e89620-a8be-4802-b69a-b62c05425b77","shortId":"BuSFeH","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-enabled API endpoints settled in USDC on the Base network. The specific endpoint at `/api/resource/35` is labeled \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which is 6-decimal, equaling $0.02). No API keys or rate limits are advertised; callers pay per request via the x402 protocol with an `X-PAYMENT` header.\n\nThe broader platform advertises 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 listed endpoints share the same $0.02/request pricing.\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 `/api/resource/35` specifically returns. The endpoint is live (returns a proper 402 x402 challenge), but without documentation it is unclear what data or functionality this particular resource provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","data"],"synonyms":["x402 API","micropayment API","USDC API","Base network API","pay-per-call API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /api/resource/35","The specific purpose of /api/resource/35 ('Premium API Access') is not explained anywhere","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/resource/35","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/resource/35","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The specific functionality of /api/resource/35 is 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'/request':18,36,154 '0.02':17,35,68,84,153 '000':74 '20':73 '402':201 '6':81 'Base network API' 'USDC API' 'access':63 'across':112 'advertis':92,110 'ai':12,30,122 'analysi':126 'analyt':11,29,116 'api':5,23,45,62,86,162 'base':8,26,52,75 'base-network' 'broader':108 'call':4,22 'caller':93 'categori':114 'challeng':203 'classif':129 'collect':40 'connect':171 'content':177 'convers':145 'cost':65 'cover':10,28 'crypto-paid API' 'data':115,119,211 'decim':82 'descript':188 'doc':161 'document':156,206 'embed':130 'enabl':44 'endpoint':46,56,111,149,195 'equal':83 'estim':140 'exampl':185 'exchang':135 'export':120 'extrem':158 'feed':134 'financ':13,31,131 'four':113 'function':213 'gas':139 'generat':146 'geocod':143 'header':106 'infrastructure/utilities':142 'insight':121 'json-response' 'key':87 'label':60 'learn':124 'limit':90 'list':148 'live':197 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':123 'maxamountrequir':71 'metric':117 'micropayment API' 'network':53 'no-api-key' 'offer':38 'openapi':181 'page':166 'particular':215 'pay':2,20,94 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':105 'per':3,21,69,95 'platform':109 'post-method' 'premium':61 'price':133,155,163 'prompt':173 'proper':200 'protocol':100 'provid':217 'quot':138 'rate':89,136 'readm':165 'render':168 'report':118 'request':70,96 'request/response':184 'resourc':216 'return':193,198 'schema':182 'sentiment':125 'settl':47 'share':150 'spars':159 'specif':55,192 'suit':6,24 'summar':128 'text':127 'token':137 'unclear':209 'unit':76 'usdc':9,27,49,78 'usdc-settlement' 'util':15,33 'valid':144 'via':97 'wallet':172 'web3':132 'without':205 'x':104 'x-payment':103 'x402':43,99,202 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f490185d-d16c-449e-83bb-011b5c0a5fd9","listingId":"54e89620-a8be-4802-b69a-b62c05425b77","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/resource/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:07.055Z"}],"sources":[{"listingId":"54e89620-a8be-4802-b69a-b62c05425b77","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:07.055Z","lastSeenAt":"2026-04-23T16:30:38.711Z"}],"details":{"listingId":"54e89620-a8be-4802-b69a-b62c05425b77","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/35 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All listed endpoints cost $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/resource/35 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/resource/35"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or AI inference endpoints without API key registration","Making one-off paid API calls settled instantly in USDC on Base","Integrating pay-per-use analytics, finance, or utility services into agent workflows"],"bestFor":["Developers who want keyless, pay-per-request API access","AI agents with x402-compatible wallets on Base","Prototyping with low-cost micro-transaction APIs"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription plans","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.79Z"},"updatedAt":"2026-04-23T16:30:38.711Z"}}