{"id":"e70fe078-8001-4c97-bad9-60eaf70336f6","shortId":"bMkbPf","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","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/57` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 endpoints are uniformly priced at $0.02 per request.\n\nDocumentation 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/57` endpoint actually returns. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what data or functionality this specific route provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"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 — all doc pages render only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific purpose of /api/v1/transactions/57 ('Premium API Access') is unexplained","Cannot verify what data or functionality this endpoint returns without paying"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/57","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/57","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, but documentation is essentially nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/transactions/57 actually returns. The listing is effectively a 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'/request':13,30 '0.02':12,29,82,154 '000':76 '20':75 '402':70,202 '402 payment api' 'accept':50 'access':66,96 'across':112 'actual':196 'advertis':87 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,163 'attach':99 'base':8,25,55,77 'base network api' 'broader':108 'call':4,21,84 'categori':114 'challeng':71,203 'classif':129 'confirm':204 'connect':172 'convers':146 'data':115,119,212 'descript':190 'detail':179 'doc':162 'document':157,207 'embed':130 'endpoint':59,111,149,195,199 'estim':140 'exampl':187 'exchang':135 'export':120 'extrem':159 'feed':134 'financ':131 'four':113 'function':214 'gas':139 'generat':147 'geocod':144 'header':103 'i.e':81 'infrastructur':142 'insight':121 'instant':95 'json-response' 'key':16,33,90 'learn':124 'limit':93 'list':62 'live':201 'low payment fee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'micropayment api' 'network':9,26,56 'no-api-key' 'offer':110 'openapi':183 'page':167 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,102 'per':3,20,40,83,155 'platform':6,23,43,86,109 'post-endpoint' 'premium':64 'price':133,152,164 'prompt':174 'protocol':48 'provid':218 'quot':138 'rate':92,136 'readm':166 'render':169 'report':118 'request':41,72,106,156 'request/response':186 'requir':17,34 'return':68,197 'rout':217 'schema':184 'sentiment':125 'simpli':98 'spars':160 'specif':58,216 'summar':128 'technic':178 'text':127 'token':137 'unclear':210 'uniform':151 'unit':78 'usdc':51,80 'usdc api' 'usdc-base-network' 'use':45 'util':143 'valid':145 'via':10,27 'wallet':173 'web3':132 'without':206 'x402':11,28,47,101 'x402 api' 'x402-payment'","prices":[{"id":"f4734f69-e6db-4dcc-8a2f-97b3608d2067","listingId":"e70fe078-8001-4c97-bad9-60eaf70336f6","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/57","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:54.444Z"}],"sources":[{"listingId":"e70fe078-8001-4c97-bad9-60eaf70336f6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/57","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:54.444Z","lastSeenAt":"2026-04-23T08:31:55.846Z"}],"details":{"listingId":"e70fe078-8001-4c97-bad9-60eaf70336f6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/57 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/57"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/57"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-use endpoints into agent workflows via x402"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone requiring high-volume, subscription-based pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.617Z"},"updatedAt":"2026-04-23T08:31:55.846Z"}}