{"id":"03b616a6-f807-43d5-9733-01ab6e1a8069","shortId":"hXcnZW","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","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. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/accounts/42` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base. The platform advertises uniform $0.02 pricing across all its endpoints. Other available endpoints include sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export, among others.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all resolve to a minimal \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The exact functionality of the `/api/v1/accounts/42` endpoint is unclear beyond its title. Agents should expect JSON responses (mimeType is `application/json`) and use HTTP POST.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","json-response","http-post","pay-per-use"],"categories":["api-platform","data","ai","finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be discovered empirically","The /docs, /pricing, /api, and /README pages contain no useful content (only 'Connect wallet')","The exact purpose and expected input/output of /api/v1/accounts/42 ('Premium API Access') is undocumented","Cannot verify what data or service this specific endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/42","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/accounts/42","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/accounts/42 is unknown. This is effectively a stub 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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/accounts/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:38.967Z"}],"sources":[{"listingId":"03b616a6-f807-43d5-9733-01ab6e1a8069","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:38.967Z","lastSeenAt":"2026-04-22T18:31:06.265Z"}],"details":{"listingId":"03b616a6-f807-43d5-9733-01ab6e1a8069","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/42 \\\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 challenge requesting up to 20,000 base units of USDC (0.02 USD) on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/42"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","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":"The asset used for payment is USD Coin (USDC) at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/accounts/42"}],"useCases":["Accessing premium data or analytics without managing API keys or subscriptions","Running AI inference (sentiment, summarization, classification, embeddings) on a per-call payment basis","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Using utility services like geocoding, validation, and data conversion with instant crypto payment"],"bestFor":["Developers who want instant API access without signup or subscription","Agents and bots that can settle x402 payments in USDC on Base","Low-volume or sporadic API consumers who prefer pay-per-use pricing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:38.32Z"},"updatedAt":"2026-04-22T18:31:06.265Z"}}