{"id":"c2caadff-5fb8-4e2a-805c-7a614d59d611","shortId":"ywsC8h","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that gates a variety of endpoints behind per-request USDC micropayments on the Base network. The probed endpoint (`/api/v1/orders/34`) is described as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call, settled to a Base address.\n\nThe site advertises four categories of APIs: 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\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 usage examples available from the crawl. The specific endpoint probed (`/api/v1/orders/34`) does not appear in the site's listed API catalog, so its exact functionality is unclear beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["micropayment API","pay-per-call API","x402 API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The probed endpoint /api/v1/orders/34 does not appear in the site's listed API catalog — its purpose is unclear","No request or response examples are available; integration requires guesswork","The breadth of advertised endpoints (AI, finance, data, utils) is unverified — no evidence they return meaningful data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/34","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/34","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 request/response schema, no documentation beyond a wallet-connect prompt, and the specific probed endpoint (/api/v1/orders/34) is not listed among the site's advertised APIs. The actual functionality behind this endpoint is 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'x402-protocol':38","prices":[{"id":"18398363-9341-438d-bc7a-9932e7f84383","listingId":"c2caadff-5fb8-4e2a-805c-7a614d59d611","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/34","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:01.209Z"}],"sources":[{"listingId":"c2caadff-5fb8-4e2a-805c-7a614d59d611","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/34","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:01.209Z","lastSeenAt":"2026-04-23T00:31:04.577Z"}],"details":{"listingId":"c2caadff-5fb8-4e2a-805c-7a614d59d611","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/34 \\\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":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/34"},{"claim":"Documentation pages /docs, /api, /pricing, /README all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates via micropayment","Running data analytics queries and exporting data on a pay-per-request basis","Using utility services like geocoding, validation, and conversion without subscription commitments","Demonstrating or testing x402 payment protocol integrations"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access without signup","AI agents that can settle x402 micropayments autonomously on Base","Projects needing low-cost access to a broad set of utility and data endpoints"],"notFor":["Users needing detailed API documentation or well-defined request/response schemas before integrating","High-volume production workloads that would benefit from bulk pricing or rate-limit guarantees","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.93Z"},"updatedAt":"2026-04-23T00:31:04.577Z"}}