{"id":"a0e5a4d2-f44d-405b-bea8-eca0d89d9e2a","shortId":"2jW7jU","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 suite 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 upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/apikeys/15` 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/request price point. However, documentation beyond the landing page is extremely sparse; the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI spec, request/response schemas, or usage examples are available.","tags":[],"capabilities":["x402-micropayment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","validation","conversion"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 API","micropayment API","pay-per-call API","USDC API","Base network API","premium API access"],"warnings":["No OpenAPI specification or request/response schemas available","Documentation pages (/docs, /api, /pricing, /README) are all empty — only show 'Connect wallet'","The specific purpose and expected input/output of /api/v1/apikeys/15 is undocumented","No examples of successful responses are available anywhere in the crawl","The endpoint name 'apikeys' suggests it may generate or manage API keys, but this is unconfirmed"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/15","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/15","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 challenge with clear pricing. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples. The purpose of the specific '/api/v1/apikeys/15' endpoint is unclear beyond the generic label 'Premium API Access.' Most pages return only 'Connect wallet' with no useful 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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":"2026-04-18T19:29:24.691Z"}],"sources":[{"listingId":"a0e5a4d2-f44d-405b-bea8-eca0d89d9e2a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:24.691Z","lastSeenAt":"2026-04-22T05:31:51.516Z"}],"details":{"listingId":"a0e5a4d2-f44d-405b-bea8-eca0d89d9e2a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/15 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/15"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/15"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto token quotes and gas estimates with per-call billing","Geocoding or data validation as a utility microservice paid per request","Exporting analytics data or generating reports without subscription commitments"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse utility endpoints","Developers wanting to avoid API key provisioning and subscription overhead","Low-volume or bursty workloads where per-request pricing is cost-effective"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Callers who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.375Z"},"updatedAt":"2026-04-22T05:31:51.516Z"}}