{"id":"846691f4-50ef-4e5e-a384-36a0104f8a87","shortId":"ZvKTa2","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides pay-per-request API access using the x402 payment protocol, settling in USDC on the Base network. The specific endpoint `/api/v1/lab/results/5` is labeled \"Premium API Access\" and returns JSON responses upon payment. The x402 challenge confirms it is live and accepts exact-scheme payments with a max amount of 20,000 base units of USDC (i.e., $0.02 per request).\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs across several 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 endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the specific endpoint `/api/v1/lab/results/5` does not clearly map to any of the advertised categories on the landing page. Its exact functionality — what \"lab results\" it returns — is undocumented. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The payment mechanism is confirmed working, but the actual data returned is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["data","api-marketplace"],"synonyms":["pay per call API","x402 API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The endpoint /api/v1/lab/results/5 is not listed among the advertised APIs on the landing page; its actual functionality is unknown.","No OpenAPI schema or request/response documentation is available.","The /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.","The exact data returned by this endpoint cannot be verified without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/lab/results/5","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/lab/results/5","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/request in USDC on Base). However, the specific endpoint's purpose (\"lab/results/5\") is entirely undocumented — it doesn't appear in the site's advertised API list. No OpenAPI schema, no request/response examples, and no documentation pages rendered meaningful content. This is effectively a stub 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<x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/lab/results/5"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/lab/results/5"},{"claim":"All listed APIs priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Advertised API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data endpoints without traditional API key registration","Making one-off API calls with instant USDC micropayments on Base","Agent-driven data retrieval with per-request crypto settlement"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may not be cost-effective compared to bulk plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:03.924Z"},"updatedAt":"2026-04-22T01:02:20.353Z"}}