{"id":"3c3d33d4-e5f4-4237-949d-18bebb0a8cbe","shortId":"AETGm5","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 an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no subscriptions required. The specific endpoint at `/api/v1/transactions/291` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals).\n\nThe platform advertises 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 listed endpoints share the same $0.02 price point. Payment is handled via the x402 protocol's exact scheme, settling on-chain on Base.\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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The actual functionality behind the `/api/v1/transactions/291` endpoint is unclear beyond its \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","crypto api access","402 payment api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet' with no content.","No OpenAPI or schema definition found for any endpoint.","The specific purpose of /api/v1/transactions/291 ('Premium API Access') is unclear; it does not match any of the named endpoint categories on the homepage.","Cannot verify actual functionality or response format without paying and calling the endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/291","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/291","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 pricing and payment details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the actual functionality of the /api/v1/transactions/291 endpoint is opaque beyond its generic 'Premium API Access' 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'/api/v1/transactions/291':84,226 '/docs':186 '/pricing':188 '/readme':190 '/request':13,28 '0.02':12,27,111,162 '000':100 '0x8335':105 '20':99 '2913':106 '402':94 '402 payment api' '6':116 'access':90,234 'actual':222 'advertis':120 'ai':130 'ai-inference' 'ai/ml':49 'analysi':134 'analyt':48,124 'api':5,20,37,71,89,233 'avail':216 'base':8,23,67,101,108,180 'base network api' 'behind':224 'beyond':230 'broad':42 'call':4,19,113 'categori':121 'chain':178 'challeng':95 'classif':137 'classification' 'collect':43 'connect':196 'content':202 'convers':154 'crawl':219 'crypto api access' 'data':47,52,123,127 'data-analytics' 'decim':117 'document':181,211 'embed':138 'embeddings' 'enabl':36 'endpoint':45,57,82,158,227 'equal':110 'estim':148 'exact':173 'exampl':215 'exchang':143 'export':128 'extrem':183 'feed':142 'financ':139 'finance-data' 'finance/web3':51 'function':223 'gas':147 'generat':155 'geocod':152 'geocoding' 'handl':167 'includ':122 'infer':50 'infrastructur':150 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'x402':11,26,35,170 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"124f754c-ed73-4870-9bc9-41049f62315d","listingId":"3c3d33d4-e5f4-4237-949d-18bebb0a8cbe","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/291","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:57.064Z"}],"sources":[{"listingId":"3c3d33d4-e5f4-4237-949d-18bebb0a8cbe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/291","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:57.064Z","lastSeenAt":"2026-04-22T20:01:39.263Z"}],"details":{"listingId":"3c3d33d4-e5f4-4237-949d-18bebb0a8cbe","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# 1. POST to the endpoint without payment to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/291\n# 2. Parse the 402 JSON, construct an x402 payment proof for 0.02 USDC,\n#    then re-send with the X-PAYMENT header.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"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 402 challenge for /api/v1/transactions/291 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/transactions/291"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet' with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto gas estimates on a per-call basis","Running geocoding or data validation utilities with instant crypto-settled payments","Exporting analytics data or generating reports via pay-as-you-go endpoints"],"bestFor":["Developers wanting zero-friction API access without subscriptions or API keys","Agents and bots that can settle x402 payments autonomously on Base","Low-volume or bursty workloads where per-request pricing is cost-effective"],"notFor":["High-volume production workloads needing SLAs, rate guarantees, or dedicated support","Users who need detailed API documentation, request/response schemas, or sandbox environments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.857Z"},"updatedAt":"2026-04-22T20:01:39.263Z"}}