{"id":"271354fb-c767-43a7-8aa0-055dfe9564a6","shortId":"bvU7vL","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a suite of 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 priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/orders/73` 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 given USDC's 6 decimals. Payment is via the x402 exact scheme, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical 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/orders/73` path is unclear; the name \"Premium API Access\" does not indicate what data or service it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","serverless api","metered api"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only a 'Connect wallet' prompt with no technical content","No OpenAPI or schema documentation available for any endpoint","The purpose of /api/v1/orders/73 ('Premium API Access') is unclear — it may be a generic order endpoint rather than a distinct service","No request body schema or response schema is documented; integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/73","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/orders/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent beyond the landing page. No OpenAPI spec, no request/response schemas, no examples, and the specific endpoint path (/api/v1/orders/73) has an unclear purpose. Pricing is clear at $0.02 per 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fee' 'lowpaymentfee.com':39 'machin':64 'materi':212 'metered api' 'metric':58 'micropayment api' 'name':223 'network':103 'no-api-key' 'offer':48 'openapi':198 'page':173,182 'paid':97 'path':219 'pay':2,21 'pay per call api' 'pay-per-request':1,20 'payment':149 'per':3,22,95 'platform':6,25,46 'post':164 'premium':120,224 'price':74,92 'prompt':189 'quot':79 'rate':77,108 'render':184 'report':59 'request':4,23,96,128,165 'request/response':201 'requir':112 'return':124,167,235 'schema':202 'scheme':155 'second':159 'sentiment':66 'sentiment-analysis' 'serverless api' 'servic':233 'spars':175 'spec':199 'specif':114 'suit':50 'summar':69 'technic':193 'text':68 'text-summarization' 'timeout':160 'token':78 'unclear':221 'unit':134 'usag':206 'usdc':99,136,145 'usdc api access' 'usdc-base' 'util':18,37,84 'valid':86 'via':9,28,151 'wallet':188 'web3':73 'x402':10,29,43,153 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e85f5ba8-2c74-4cd0-9fed-e97049bc497f","listingId":"271354fb-c767-43a7-8aa0-055dfe9564a6","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/orders/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:40.352Z"}],"sources":[{"listingId":"271354fb-c767-43a7-8aa0-055dfe9564a6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:40.352Z","lastSeenAt":"2026-04-23T20:31:59.829Z"}],"details":{"listingId":"271354fb-c767-43a7-8aa0-055dfe9564a6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/73 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/orders/73"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) on a per-call basis without subscriptions","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running utility tasks like geocoding, validation, and data conversion with instant pay-per-use pricing","Exporting data or generating analytics reports without managing API keys"],"bestFor":["Agents or developers who want zero-setup, pay-as-you-go API access","Crypto-native applications that can settle payments in USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs, guaranteed uptime, or detailed documentation","Users who cannot transact in USDC on the Base network","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.032Z"},"updatedAt":"2026-04-23T20:31:59.829Z"}}