{"id":"d07f96b1-76db-4a3c-bcdb-4d28a3966a35","shortId":"YYD7mR","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request for data, AI, finance, and utility endpoints.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transactions/50` is listed as \"Premium API Access\" and accepts x402 payments with a maximum cost of 20,000 base units of USDC (i.e., $0.02 per request). No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe platform organizes its endpoints into 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 are priced uniformly at $0.02 per call.\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 the `/api/v1/transactions/50` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual payload format and response structure are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","lowpaymentfee"],"warnings":["No API documentation available — all doc pages show only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats","The specific purpose of /api/v1/transactions/50 is undocumented","No examples of expected input or output for any endpoint","The broad catalog of endpoints (AI, finance, data, utils) is listed but none have detailed descriptions"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/50","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge confirms the endpoint is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. The purpose of the specific /api/v1/transactions/50 endpoint is unclear beyond its generic 'Premium API Access' 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'/request':13,33 '0.02':12,32,94,162 '000':88 '20':87 'accept':79,214 'access':77 'actual':219 'advertis':104 'ai':16,36,130 'ai-inference' 'analysi':134 'analyt':124 'api':5,25,47,76,98,171 'attach':107 'base':8,28,65,89 'base network api' 'base-network' 'broad':52 'call':4,24,164 'caller':105 'catalog':53 'categori':122 'challeng':207 'classif':137 'classification' 'confirm':208 'connect':180 'content':186 'convers':153 'cost':85 'data':15,35,123,127 'data-analytics' 'descript':197 'doc':170 'document':165 'embed':138 'embeddings' 'enabl':46 'endpoint':20,40,59,69,119,157,202,210 'estim':148 'exampl':194 'exchang':143 'export':128 'extrem':167 'feed':142 'financ':17,37,139 'finance-data' 'format':221 'four':121 'gas':147 'generat':154 'geocod':151 'geocoding' 'header':111 'i.e':93 'infrastructure/utilities':150 'insight':129 'key':99 'learn':132 'limit':102 'list':73,156 'live':212 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':131 'maximum':84 'metric':125 'micropayment api' 'network':9,29,66 'offer':50 'openapi':190 'organ':117 'page':175 'pay':2,22,56 'pay per call api' 'pay-per-cal':1,21 'pay-per-request':55 'payload':220 'payment':81,110 'per':3,23,57,95,163 'platform':6,26,48,116 'post':215 'premium':75 'price':141,159,172 'prompt':182 'quot':146 'rate':101,144 'readm':174 'render':177 'report':126 'request':58,96,114,216 'request/response':193 'respons':223 'return':204 'schema':191 'sentiment':133 'sentiment-analysis' 'settl':60 'simpli':106 'spars':168 'specif':68,203 'structur':224 'summar':136 'text':135 'text-summarization' 'token':145 'uniform':160 'unit':90 'unknown':226 'usdc':62,92 'usdc api' 'usdc-settlement' 'util':19,39 'utility-apis' 'valid':152 'via':10,30 'wallet':181 'web3':140 'x402':11,31,45,80,109,206 'x402 api' 'x402-enabled':44 'x402-payment'","prices":[{"id":"62ae62b6-8bf9-46d9-b78f-250d19fbe58f","listingId":"d07f96b1-76db-4a3c-bcdb-4d28a3966a35","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:51.431Z"}],"sources":[{"listingId":"d07f96b1-76db-4a3c-bcdb-4d28a3966a35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:51.431Z","lastSeenAt":"2026-04-22T18:32:36.886Z"}],"details":{"listingId":"d07f96b1-76db-4a3c-bcdb-4d28a3966a35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/50 \\\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/50"},{"claim":"All endpoints are 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":"The platform offers endpoints 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/50"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments"],"bestFor":["Agents or applications that need simple pay-per-call API access without subscriptions","Developers wanting to avoid API key provisioning and rate limit management","x402-compatible clients on the Base network looking for low-cost endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription models"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.737Z"},"updatedAt":"2026-04-22T18:32:36.886Z"}}