{"id":"ce8638d9-f10a-4be0-a7b8-95b39a23d792","shortId":"QNKnab","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad set of endpoints across four 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 priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/inbox/200` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made per-call via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST requests and returns application/json.\n\nDocumentation beyond the landing page is sparse — the /api, /pricing, and /README routes all resolve to a wallet-connect prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The exact functionality of the `/api/v1/inbox/200` path is unclear; it does not map to any of the named endpoints on the landing page. Agents should treat this as a live but under-documented endpoint.","tags":[],"capabilities":["x402-payment","per-call-billing","usdc-settlement","base-network","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No OpenAPI or schema documentation available","The /api/v1/inbox/200 path does not correspond to any named endpoint on the provider's landing page — its actual functionality is unknown","All documentation pages (/api, /pricing, /README) return only a wallet-connect prompt with no content","No request body schema or response examples are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/200","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/inbox/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific /api/v1/inbox/200 path is not described among the listed endpoints. Effectively a stub 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'x402-payment'","prices":[{"id":"beb5e574-c06c-493c-b6db-01c5316a4af1","listingId":"ce8638d9-f10a-4be0-a7b8-95b39a23d792","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/inbox/200","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.461Z"}],"sources":[{"listingId":"ce8638d9-f10a-4be0-a7b8-95b39a23d792","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/200","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.461Z","lastSeenAt":"2026-04-22T04:02:45.872Z"}],"details":{"listingId":"ce8638d9-f10a-4be0-a7b8-95b39a23d792","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/200 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment settled in USDC on Base network via x402 protocol","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/200"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic pay-per-call access to data, AI, finance, or utility services","Testing x402 payment flows on Base with low-cost endpoints"],"bestFor":["AI agents that settle payments in USDC on Base","Developers exploring x402 protocol integrations","Low-volume, no-commitment API consumption at $0.02/call"],"notFor":["High-volume workloads where per-call pricing becomes expensive compared to subscription plans","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.344Z"},"updatedAt":"2026-04-22T04:02:45.872Z"}}