{"id":"336a4156-2986-4ccc-b00c-4fe784bf9ce6","shortId":"7mdugJ","kind":"x402","title":"x402-gated premium API access on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated premium API access on Base, pay-per-call with USDC at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-protocol pay-per-request API endpoints on the Base network, settled in USDC. The specific endpoint at `/api/v1/policies/7` is listed as \"Premium API Access\" and returns a 402 challenge requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. No API keys, subscriptions, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers 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 listed at the same $0.02/request price point. However, the specific functionality behind `/api/v1/policies/7` (\"Premium API Access\") is not documented beyond its title, so its exact input/output behavior is unknown.\n\nThe endpoint is live and responds with a well-formed x402 version 1 challenge. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 on Base mainnet. The output schema indicates it accepts HTTP POST requests and is discoverable. Documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","http-post","json-response","premium-api"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific functionality of /api/v1/policies/7 ('Premium API Access') is undocumented — its inputs and outputs are unknown.","All documentation pages (/docs, /pricing, /api, /README) returned no substantive content, only a 'Connect wallet' prompt.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","The endpoint name 'Premium API Access' is generic and does not describe what the endpoint actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/7","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/policies/7","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 challenge, but there is no documentation, no request/response schema, and the purpose of 'Premium API Access' at /api/v1/policies/7 is entirely opaque. All doc pages returned only 'Connect wallet' with no content. This is effectively a stub 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'x402':2,19,41,112,200 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':40","prices":[{"id":"99e7641f-5941-400f-9b7b-c1ddf9a4c55e","listingId":"336a4156-2986-4ccc-b00c-4fe784bf9ce6","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/policies/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:01.428Z"}],"sources":[{"listingId":"336a4156-2986-4ccc-b00c-4fe784bf9ce6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:01.428Z","lastSeenAt":"2026-04-23T06:31:18.534Z"}],"details":{"listingId":"336a4156-2986-4ccc-b00c-4fe784bf9ce6","quickStartSnippet":"# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/7\n# 2. Parse the 402 response, construct an x402 payment proof for 20000 base units USDC on Base\n# 3. Resend with the payment header:\ncurl -X POST https://lowpaymentfee.com/api/v1/policies/7 \\\n  -H \"X-PAYMENT: <your-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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/7"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/7"},{"claim":"All endpoints are priced at $0.02/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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access without subscription commitments or API key management"],"bestFor":["Developers wanting zero-commitment pay-per-call API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users needing detailed API documentation or well-defined schemas before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.458Z"},"updatedAt":"2026-04-23T06:31:18.534Z"}}