{"id":"de008346-2592-49f0-b28f-29a2a21cfb46","shortId":"mn7zGT","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/364` 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, rate limits, or subscriptions are required — each request is individually settled on-chain.\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.\n\nHowever, documentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transactions/364` endpoint specifically returns. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or functionality this particular route provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto pay-per-use"],"warnings":["No documentation available — all doc pages show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/transactions/364 ('Premium API Access') is not explained anywhere","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/364","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/364","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","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 request/response examples, and all documentation pages render only 'Connect wallet' with no content. The purpose of the specific /api/v1/transactions/364 route is undocumented. This is effectively a stub 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'/request':13,28 '0.02':12,27,80,147 '000':74 '20':73 '402':66 'Base network API' 'USDC API' 'accept':46 'access':62 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,84,105,157 'base':8,23,51,75 'broader':101 'call':4,19,82 'categori':106 'chain':99 'challeng':67,202 'classif':122 'connect':166 'convers':139 'crypto pay-per-use' 'data':108,112,210 'descript':184 'detail':173 'doc':156 'document':151,205 'embed':123 'endpoint':55,142,189,193 'estim':133 'exampl':181 'exchang':128 'export':113 'extrem':153 'feed':127 'financ':124 'function':212 'gas':132 'generat':140 'geocod':137 'howev':150 'i.e':79 'includ':107 'individu':95 'infrastructur':135 'insight':114 'json-response' 'key':85 'learn':117 'limit':87 'list':58 'live':195 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':116 'metric':110 'micropayment API' 'multipl':104 'network':9,24,52 'no-api-key' 'on-chain':97 'openapi':177 'page':161 'particular':214 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,69 'per':3,18,36,81,148 'platform':6,21,39,102 'premium':60 'price':126,145,158 'prompt':168 'protocol':44 'provid':216 'quot':131 'rate':86,129 'readm':160 'render':163 'report':111 'request':37,93,149 'request/response':180 'requir':68,91 'respond':197 'return':64,191 'rout':215 'schema':178 'sentiment':118 'settl':96 'spars':154 'specif':54,190 'subscript':89 'summar':121 'technic':172 'text':120 'token':130 'unclear':208 'uniform':144 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':136 'valid':138,200 'via':10,25 'wallet':167 'web3':125 'without':204 'x402':11,26,43,201 'x402 API' 'x402-payment'","prices":[{"id":"5288f8ae-a9ab-4432-af98-e0a6e9e140a9","listingId":"de008346-2592-49f0-b28f-29a2a21cfb46","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/364","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:24.068Z"}],"sources":[{"listingId":"de008346-2592-49f0-b28f-29a2a21cfb46","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/364","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:24.068Z","lastSeenAt":"2026-04-23T11:31:27.889Z"}],"details":{"listingId":"de008346-2592-49f0-b28f-29a2a21cfb46","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/364 \\\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/364"},{"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","source_url":"https://lowpaymentfee.com/api/v1/transactions/364"}],"useCases":["Accessing premium API data without subscriptions or API key management","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need on-chain payment per request"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who prefer subscription-based pricing","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.009Z"},"updatedAt":"2026-04-23T11:31:27.889Z"}}