{"id":"4a08c004-196d-4d9f-bb71-6cfb36fe113f","shortId":"jtqX43","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-enabled API endpoints spanning 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 via the x402 protocol.\n\nThe specific endpoint at `/api/v1/payments/5` is labeled \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. No API keys or rate limits are required — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, 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. It is unclear what request body the `/api/v1/payments/5` endpoint expects or what it returns beyond a generic JSON content type. The actual functionality behind \"Premium API Access\" is not described anywhere in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","analytics-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-api"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only 'Connect wallet' with no content","The purpose and expected input/output of /api/v1/payments/5 ('Premium API Access') is not documented anywhere","No request or response examples are available","It is unclear whether the listed AI, analytics, finance, and utility endpoints are fully functional or placeholders"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/5","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/payments/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of '/api/v1/payments/5' ('Premium API Access') is undefined. Effectively a stub 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Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:45.256Z"}],"sources":[{"listingId":"4a08c004-196d-4d9f-bb71-6cfb36fe113f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:45.256Z","lastSeenAt":"2026-04-22T15:01:39.618Z"}],"details":{"listingId":"4a08c004-196d-4d9f-bb71-6cfb36fe113f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/5 \\\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 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 x402 challenge for /api/v1/payments/5 advertises maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/payments/5"},{"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 financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running analytics queries and data exports with instant pay-per-use billing","Using utility services like geocoding, validation, and conversion via crypto micropayments"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","Agents and bots that can settle USDC payments on Base via x402","Projects needing low-cost micropayment-gated endpoints without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-crypto payment methods","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.147Z"},"updatedAt":"2026-04-22T15:01:39.618Z"}}