{"id":"87d94b04-e125-4073-919d-a516ec975adf","shortId":"nAcKWc","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 provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/24` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint 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 the same $0.02/request price point. The platform claims no rate limits and instant access.\n\nImportant caveat: the specific endpoint `/api/v1/keys/24` is labeled generically as \"Premium API Access\" and does not appear in the public endpoint catalog on the landing page. There is no documentation, OpenAPI schema, or example request/response available for this or any other endpoint. The actual functionality behind this particular path is unclear — it may be an API key provisioning endpoint or a generic access point. Without schemas or docs, callers should treat this as experimental.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","micropayment API","Base network API","lowpaymentfee","402 payment API"],"warnings":["No OpenAPI schema or endpoint documentation available","The path /api/v1/keys/24 does not appear in the provider's public endpoint catalog — its actual functionality is unclear","No example request or response bodies are available; callers must experiment","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/24","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/keys/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid x402 402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation, no example requests or responses, and the specific endpoint path '/api/v1/keys/24' is not listed in the public catalog. The actual functionality is 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'x402-payment'","prices":[{"id":"52a9ebbf-3819-49c4-82eb-e738fcb640df","listingId":"87d94b04-e125-4073-919d-a516ec975adf","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/keys/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.039Z"}],"sources":[{"listingId":"87d94b04-e125-4073-919d-a516ec975adf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.039Z","lastSeenAt":"2026-04-22T10:02:58.621Z"}],"details":{"listingId":"87d94b04-e125-4073-919d-a516ec975adf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/24 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/24"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/24"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or sporadic API usage where subscriptions are wasteful"],"notFor":["Users needing detailed API documentation or OpenAPI schemas before integration","High-volume production workloads requiring SLAs or guaranteed uptime","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.388Z"},"updatedAt":"2026-04-22T10:02:58.621Z"}}