{"id":"79749752-fc0c-4c22-9398-e2190b746898","shortId":"bTn66N","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is pay-per-call at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/apikeys/10` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per-call price point. Documentation pages beyond the landing page were largely empty (showing only \"Connect wallet\"), so detailed request/response schemas for individual endpoints are not available.","tags":[],"capabilities":["x402-micropayment","pay-per-request","usdc-base","api-key-generation","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api access","base network api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) returned no meaningful content — only 'Connect wallet'.","No OpenAPI or JSON schema is available for any endpoint.","The specific functionality of /api/v1/apikeys/10 is unclear — the name suggests API key generation but no details are documented.","Request and response body formats are unknown; callers must experiment or contact the provider."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/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/v1/apikeys/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, documentation pages are effectively empty, there is no OpenAPI schema, no request/response examples, and the specific purpose of the '/api/v1/apikeys/10' endpoint beyond 'Premium API Access' is 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'x402-micropayment'","prices":[{"id":"0e8c62a7-02f4-4e29-a485-440e02464950","listingId":"79749752-fc0c-4c22-9398-e2190b746898","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/apikeys/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":"2026-04-18T19:29:31.439Z"}],"sources":[{"listingId":"79749752-fc0c-4c22-9398-e2190b746898","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:31.439Z","lastSeenAt":"2026-04-22T05:31:51.807Z"}],"details":{"listingId":"79749752-fc0c-4c22-9398-e2190b746898","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/10 \\\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 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme and 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/apikeys/10"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents purchasing one-off API calls without needing pre-registered API keys","Accessing AI inference (sentiment, summarization, classification, embeddings) with per-request USDC micropayments","Fetching real-time crypto quotes, gas estimates, and exchange rates on demand","Geocoding, data validation, and format conversion as utility microservices"],"bestFor":["AI agents and bots that need keyless, on-demand API access","Developers who want pay-as-you-go pricing without subscriptions","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume batch processing where per-request fees add up quickly","Users without a Base-compatible wallet or USDC holdings","Applications requiring detailed SLAs, guaranteed uptime, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.113Z"},"updatedAt":"2026-04-22T05:31:51.807Z"}}