{"id":"417dec64-e3aa-4f40-9958-f73ef7b8b1f4","shortId":"2bv4gt","kind":"x402","title":"x402-gated API marketplace on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API marketplace on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a variety of endpoints across four categories: Data & Analytics (metrics, reports, 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 payable per-request via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint at `/api/v1/carts/74` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, which has 6 decimals — so $0.02) per request. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is granted purely through x402 payment headers.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the `/api/v1/carts/74` endpoint actually returns. The site lists many endpoints but provides no detail on input parameters or output formats for any of them. The purpose of the `/carts/74` endpoint specifically is unclear and may be a generic or demo listing.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-pricing","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","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, /api, /pricing, and /README all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/carts/74 has no description beyond 'Premium API Access' — its actual functionality is unknown","No request or response examples available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/74","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/74","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 accepts USDC payments on Base. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of `/api/v1/carts/74` specifically is unclear. The site lists many endpoints but documents none of 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'x402-payment'","prices":[{"id":"57d27bff-32f2-4e95-a580-16f0162e3de9","listingId":"417dec64-e3aa-4f40-9958-f73ef7b8b1f4","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/74","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:14.671Z"}],"sources":[{"listingId":"417dec64-e3aa-4f40-9958-f73ef7b8b1f4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/74","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:14.671Z","lastSeenAt":"2026-04-23T22:01:42.410Z"}],"details":{"listingId":"417dec64-e3aa-4f40-9958-f73ef7b8b1f4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/74 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 USDC units on Base using the exact scheme","source_url":"https://lowpaymentfee.com/api/v1/carts/74"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/74"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates via micropayments","Geocoding and data validation as a utility service paid per-call on Base"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","Agents that can settle x402 payments in USDC on Base","Projects needing lightweight, no-commitment access to common API utilities"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.248Z"},"updatedAt":"2026-04-23T22:01:42.410Z"}}