{"id":"51cdcc65-0f65-4781-9fa8-767954e864ba","shortId":"KhDYTj","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 settled in USDC on the Base network. The specific endpoint at `/api/resource/10` is labeled \"Premium API Access\" and costs up to $0.02 per request (maxAmountRequired of 20,000 base units of USDC, which is 6-decimal, equaling $0.02). No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises 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 listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely thin — 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 example payloads available. The x402 challenge is live and well-formed, but without documentation it is unclear what request body `/api/resource/10` expects or what it returns beyond `application/json`.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","analytics-api","ai-inference","finance-data","utility-endpoints","json-response"],"categories":["api-marketplace","crypto-payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access","402 payment API"],"warnings":["No OpenAPI or schema documentation available — request/response formats for /api/resource/10 are unknown","All doc pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content","The purpose and expected input of /api/resource/10 specifically is not documented; 'Premium API Access' is a generic label","Cannot verify that the advertised AI, analytics, finance, and utility endpoints actually function — only /api/resource/10 was probed"],"endpointUrl":"https://lowpaymentfee.com/api/resource/10","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/resource/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages render only 'Connect wallet' with no usable content. The specific purpose of /api/resource/10 is 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'x402-payment'","prices":[{"id":"d629d5e8-951e-41ce-a574-96cd27172949","listingId":"51cdcc65-0f65-4781-9fa8-767954e864ba","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/resource/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:39.727Z"}],"sources":[{"listingId":"51cdcc65-0f65-4781-9fa8-767954e864ba","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:39.727Z","lastSeenAt":"2026-04-22T05:30:35.629Z"}],"details":{"listingId":"51cdcc65-0f65-4781-9fa8-767954e864ba","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/10 \\\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":"Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/resource/10"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/resource/10"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Pay-per-call analytics, AI inference, or financial data retrieval settled in USDC","Programmatic access to utility services (geocoding, validation, conversion) with crypto micropayments"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","Use cases requiring small, infrequent API calls where $0.02/request is economical","Base-network USDC holders looking for native crypto-settled services"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.123Z"},"updatedAt":"2026-04-22T05:30:35.629Z"}}