{"id":"9b516601-add9-4c42-835d-1ea8c27957ba","shortId":"4KP8GU","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/69` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with each request.\n\nThe wider platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing. The platform emphasizes no rate limits, no minimums, and instant access.\n\nImportant caveat: the specific endpoint being listed here (`/api/v1/keys/69`) does not clearly map to any of the documented API categories. Its description is simply \"Premium API Access,\" and no schema, request/response examples, or further documentation are available. The crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail. Treat this endpoint as functional but under-documented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint path '/api/v1/keys/69' does not correspond to any documented API category on the site","No request body schema or response examples are provided anywhere in the crawl","Docs, pricing, and README pages all returned only a 'Connect wallet' prompt with no content","The purpose and functionality of this specific endpoint are unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/69","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/keys/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific endpoint '/api/v1/keys/69' has no description beyond 'Premium API Access'. Effectively a 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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/keys/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.737Z"}],"sources":[{"listingId":"9b516601-add9-4c42-835d-1ea8c27957ba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.737Z","lastSeenAt":"2026-04-22T07:02:06.741Z"}],"details":{"listingId":"9b516601-add9-4c42-835d-1ea8c27957ba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/69 \\\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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/69"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/69"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, instant API access without subscriptions","Programmatic access to data, AI, finance, or utility endpoints with crypto settlement"],"bestFor":["Developers or agents who want pay-as-you-go API access without signup","Use cases requiring low-cost per-request pricing ($0.02) settled on-chain","Crypto-native applications already operating on the Base L2 network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Applications that cannot handle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.328Z"},"updatedAt":"2026-04-22T07:02:06.741Z"}}