{"id":"306111fa-dd1a-4dd3-ad5b-784cee068001","shortId":"j869TS","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated by the x402 payment protocol. The site offers a broad catalog of pay-per-call APIs spanning 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 priced at $0.02 per request, settled in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint probed (/api/v1/apikeys/96) is described as \"Premium API Access\" and returned a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the x402 exact scheme with a 300-second timeout. The payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3. The endpoint accepts HTTP POST requests.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, 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 usage examples available from the crawl. The exact functionality behind the /api/v1/apikeys/96 path is unclear; it may be an API key provisioning or management endpoint, but this is speculative. Users should expect to experiment or contact the provider for details on request and response formats.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","api-key-management","data-analytics","ai-inference","finance-data","web3-data","geocoding","text-summarization","sentiment-analysis","embeddings"],"categories":["api-marketplace","crypto","ai"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base network api","usdc api access","premium api key"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no useful content","The exact functionality of /api/v1/apikeys/96 is undocumented — 'Premium API Access' is vague","No examples of request body or response format could be found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/96","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/96","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 ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the exact purpose of the /api/v1/apikeys/96 path is unclear. This is effectively a stub 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'x402':5,18,38,128,151 'x402 api' 'x402-payment'","prices":[{"id":"248e735b-e805-453a-8926-638a752f92a8","listingId":"306111fa-dd1a-4dd3-ad5b-784cee068001","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/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:37.975Z"}],"sources":[{"listingId":"306111fa-dd1a-4dd3-ad5b-784cee068001","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/96","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:37.975Z","lastSeenAt":"2026-04-22T05:31:52.104Z"}],"details":{"listingId":"306111fa-dd1a-4dd3-ad5b-784cee068001","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/96 \\\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 live x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/96"},{"claim":"All listed APIs 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 site offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/apikeys/96"}],"useCases":["Purchasing or provisioning API keys for the lowpaymentfee.com platform via a single micropayment","Accessing a variety of data, AI, finance, and utility APIs at $0.02 per call without subscription","Agent-driven programmatic access to paid endpoints using x402 USDC micropayments on Base"],"bestFor":["Developers or agents wanting zero-commitment, pay-per-use API access","Crypto-native workflows that can settle USDC on Base","Exploring multiple API categories (AI, finance, data) from a single provider at uniform pricing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.754Z"},"updatedAt":"2026-04-22T05:31:52.104Z"}}