{"id":"19ae53c2-e868-47fc-8306-bdf7714a970e","shortId":"f5zzZ6","kind":"x402","title":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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.\n\nThe specific endpoint at `/api/v1/carts/84` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/carts/84` endpoint actually returns. The site lists 16 different API endpoints but provides no detail on input parameters or response formats for any of them. The \"Premium API Access\" label on this specific cart endpoint does not clarify what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","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","base usdc api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available — all docs pages render only 'Connect wallet'","The specific endpoint '/api/v1/carts/84' labeled 'Premium API Access' has no description of what data or service it provides","No request body schema or response examples are documented anywhere","The 16 listed endpoints have no documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/84","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/carts/84","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, confirming it works. However, there is no OpenAPI spec, no documentation beyond a landing page listing, no request/response schemas, and no clarity on what '/api/v1/carts/84' specifically returns. The docs pages are empty. This is effectively a stub 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'machin':69 'made':144 'maxamountrequir':127 'metric':63 'micropayment api' 'network':107 'offer':48 'openapi':192 'page':177 'paid':101 'paramet':221 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':142 'per':3,22,55,99 'platform':6,25,46 'post':162 'premium':116,230 'price':79,96,174 'prompt':184 'provid':216,247 'quot':84 'rate':82,155 'readm':176 'render':179 'report':64 'request':4,23,56,100,163 'request/response':195 'requir':158 'respons':223 'return':120,165,207 'schema':196 'scheme':149 'sentiment':71 'sentiment-analysis' 'servic':245 'site':209 'spars':170 'spec':193 'specif':109,236 'subscript':153 'summar':74 'text':73 'text-summarization' 'token':83 'unit':132 'usdc':103,134 'usdc-base' 'util':15,34 'utility-apis' 'valid':90,122 'via':9,28,145 'wallet':183 'web3':78 'x402':10,29,43,123,147 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"6ea9f55a-e51d-40f8-bc07-3f13f68aad34","listingId":"19ae53c2-e868-47fc-8306-bdf7714a970e","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/carts/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:23.962Z"}],"sources":[{"listingId":"19ae53c2-e868-47fc-8306-bdf7714a970e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:23.962Z","lastSeenAt":"2026-04-23T17:31:08.653Z"}],"details":{"listingId":"19ae53c2-e868-47fc-8306-bdf7714a970e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/84 \\\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, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/84"},{"claim":"Endpoint described as 'Premium API Access' accepting POST with application/json mime type","source_url":"https://lowpaymentfee.com/api/v1/carts/84"},{"claim":"Site lists 16 API endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments"],"bestFor":["Agents or developers who want zero-commitment, pay-as-you-go API access","Use cases requiring no API key signup or rate limit negotiation","x402-compatible clients settling in USDC on Base"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request pricing may be inefficient compared to subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.99Z"},"updatedAt":"2026-04-23T17:31:08.653Z"}}