{"id":"f6b37058-7a65-4bc1-9e5c-b5c20a39b092","shortId":"hypT9w","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/transactions/67` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an x402 payment header to each request.\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 priced at $0.02 per request.\n\nDocumentation is extremely sparse — the docs, pricing, API, 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 `/api/v1/transactions/67` endpoint actually returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or functionality this specific resource provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or request/response schema provided; it is unknown what data /api/v1/transactions/67 returns.","The endpoint name 'Premium API Access' is generic and does not describe its function.","Cannot verify what the endpoint actually does without paying; treat with caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/67","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/transactions/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no request/response examples, and no explanation of what this specific endpoint returns. The docs/pricing/README pages are all empty wallet-connect 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'/request':13,28 '0.02':12,27,80,147 '000':74 '20':73 '402':66 '402 payment api' 'accept':46 'access':62 'actual':188 'advertis':104 'ai':116 'analysi':120 'analyt':110 'api':5,20,38,61,84,106,157 'attach':93 'base':8,23,51,75 'base network api' 'broader':102 'call':4,19,82 'caller':91 'categori':107 'challeng':67,200 'classif':123 'connect':165 'content':171 'convers':140 'data':109,113,208 'descript':182 'doc':155 'document':150,203 'embed':124 'endpoint':55,143,187,191 'estim':134 'exampl':179 'exchang':129 'export':114 'extrem':152 'feed':128 'financ':125 'function':210 'gas':133 'generat':141 'geocod':138 'header':97 'i.e':79 'includ':108 'infrastructur':136 'insight':115 'json-response' 'key':85 'learn':118 'limit':88 'list':58 'live':193 'low payment fee' 'lowpaymentfee.com':31 'machin':117 'metric':111 'micropayment api' 'multipl':105 'network':9,24,52 'no-api-key' 'openapi':175 'page':160 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,69,96 'per':3,18,36,81,148 'platform':6,21,39,103 'post-method' 'premium':60 'price':127,145,156 'prompt':167 'protocol':44 'provid':214 'quot':132 'rate':87,130 'readm':159 'render':162 'report':112 'request':37,100,149 'request/response':178 'requir':68,90 'resourc':213 'respond':195 'return':64,189 'schema':176 'sentiment':119 'simpli':92 'spars':153 'specif':54,212 'summar':122 'text':121 'token':131 'unclear':206 'unit':76 'usdc':15,30,47,78 'usdc api' 'usdc-base-network' 'use':41 'util':137 'valid':139,198 'via':10,25 'wallet':166 'web3':126 'without':202 'x402':11,26,43,95,199 'x402 api' 'x402-payment'","prices":[{"id":"b6ff66cc-63df-4453-bbf7-08192a3d5431","listingId":"f6b37058-7a65-4bc1-9e5c-b5c20a39b092","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/transactions/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:57.414Z"}],"sources":[{"listingId":"f6b37058-7a65-4bc1-9e5c-b5c20a39b092","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:57.414Z","lastSeenAt":"2026-04-23T08:31:55.975Z"}],"details":{"listingId":"f6b37058-7a65-4bc1-9e5c-b5c20a39b092","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/67 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/67"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/67"}],"useCases":["Programmatic access to API endpoints without managing API keys or subscriptions","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Exploring x402 protocol integration for pay-per-use services"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Production workloads requiring well-documented, stable API contracts","Users who need detailed request/response schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.445Z"},"updatedAt":"2026-04-23T08:31:55.975Z"}}