{"id":"4b03815a-837f-496d-bee5-80ae2a8305de","shortId":"huJedU","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 marketplace that gates a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/63` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform 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 the same $0.02 per request price point.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The specific functionality behind `/api/v1/cards/63` (\"Premium API Access\") is not described beyond its title, so its actual behavior is unknown. The endpoint is live and returns a valid x402 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","pay-per-use","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","crypto-payments"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The specific functionality of /api/v1/cards/63 ('Premium API Access') is completely undocumented","No OpenAPI schema or request/response examples are provided","No way to verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/63","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/cards/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation beyond the endpoint title. No OpenAPI schema, no request/response examples, and no description of what '/api/v1/cards/63' actually returns. The docs pages are empty ('Connect wallet' only). The listing is effectively a 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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/cards/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:44.260Z"}],"sources":[{"listingId":"4b03815a-837f-496d-bee5-80ae2a8305de","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:44.260Z","lastSeenAt":"2026-04-22T05:30:57.867Z"}],"details":{"listingId":"4b03815a-837f-496d-bee5-80ae2a8305de","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/63 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/63"},{"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 APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/63"}],"useCases":["Accessing premium API endpoints without creating accounts or managing API keys","Making one-off data or AI inference requests with per-call USDC micropayments","Integrating pay-as-you-go API calls into autonomous agent workflows on Base"],"bestFor":["Developers wanting frictionless, keyless API access via crypto micropayments","AI agents that need to autonomously purchase API calls on the Base network","Projects needing low-cost per-request pricing without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer flat-rate or subscription pricing","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.416Z"},"updatedAt":"2026-04-22T05:30:57.867Z"}}