{"id":"55064a8f-f6df-4372-9967-53da44a9e288","shortId":"kCwcfG","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/285` 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 listed at the same $0.02/request price point.\n\nHowever, documentation is extremely thin. 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/285` endpoint actually returns. The endpoint path suggests a transaction resource but the actual payload and behavior are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific endpoint /api/v1/transactions/285 has no description beyond 'Premium API Access' — actual functionality is unknown","The platform lists many endpoint categories (AI, finance, analytics, etc.) but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/285","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/285","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 request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual functionality of this specific endpoint (/api/v1/transactions/285) is entirely 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92 'across':108 'actual':194,205 'advertis':83 'ai':118 'ai-inference' 'analysi':122 'analyt':112 'api':5,20,38,61,85,162 'attach':95 'base':8,23,51,73 'base network api' 'behavior':208 'broader':104 'call':4,19,80 'categori':110 'challeng':67 'classif':125 'connect':171 'content':177 'convers':142 'crypto-data' 'data':111,115 'data-analytics' 'descript':188 'doc':161 'document':156 'embed':126 'endpoint':55,107,145,193,197 'estim':136 'exampl':185 'exchang':131 'export':116 'extrem':158 'feed':130 'financ':127 'finance-data' 'four':109 'gas':135 'generat':143 'geocod':140 'geocoding' 'header':99 'howev':155 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'learn':120 'limit':89 'list':58,147 'low payment fee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':181 'page':166 'path':198 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payload':206 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'premium':60 'price':129,153,163 'prompt':173 'protocol':44 'quot':134 'rate':88,132 'readm':165 'render':168 'report':114 'request':37,68,102 'request/response':184 'resourc':202 'return':64,195 'schema':182 'sentiment':121 'simpli':94 'specif':54 'suggest':199 'summar':124 'text':123 'thin':159 'token':133 'transact':201 'unit':74 'unknown':210 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':139 'utility-services' 'valid':141 'via':10,25 'wallet':172 'web3':128 'x402':11,26,43,97 'x402 api' 'x402-payment'","prices":[{"id":"4819900d-3b8d-4bd1-9b23-e559063c10a4","listingId":"55064a8f-f6df-4372-9967-53da44a9e288","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/285","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:48.326Z"}],"sources":[{"listingId":"55064a8f-f6df-4372-9967-53da44a9e288","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/285","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:48.326Z","lastSeenAt":"2026-04-22T19:32:17.406Z"}],"details":{"listingId":"55064a8f-f6df-4372-9967-53da44a9e288","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/285 \\\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/285"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","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/285"}],"useCases":["Accessing data analytics and reports on a per-request basis without subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching crypto price feeds, gas estimates, and exchange rates via micropayments","Geocoding and data conversion utilities paid per use"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agents and bots that can attach x402 payment headers automatically","Users who prefer crypto-native (USDC on Base) billing over traditional API keys"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.737Z"},"updatedAt":"2026-04-22T19:32:17.406Z"}}