{"id":"fc432f05-fb17-4955-bada-ac712d532999","shortId":"6mSYsm","kind":"x402","title":"Pay-per-call OpenAI API key access via x402 on Base for $0.02 USDC per request.","tagline":"Pay-per-call OpenAI API key access via x402 on Base for $0.02 USDC per request.","description":"This x402 endpoint at lowpaymentfee.com provides on-demand access to an OpenAI API key. When you pay the per-request fee, the endpoint returns a usable OpenAI API key that you can use for downstream calls. The payment is settled in USDC on the Base network using the x402 exact-payment scheme.\n\nThe endpoint charges a maximum of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. There are no API keys, subscriptions, or rate limits required on the lowpaymentfee.com side — you simply attach an X-PAYMENT header with a valid x402 payment proof and receive the key in the JSON response. The site advertises a broader suite of APIs across data/analytics, AI/ML, finance/Web3, and utility categories, all at the same $0.02 per-request price point.\n\nThe endpoint is live and returns a proper x402 challenge (HTTP 402) when called without payment. It accepts POST requests and returns application/json. The payment is directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","tags":[],"capabilities":["x402-payment","openai-key-access","usdc-base-settlement","pay-per-request","no-api-key-required"],"categories":["llm","infrastructure"],"synonyms":["OpenAI API key","pay-per-use API key","x402 OpenAI","USDC API access","on-demand GPT key","micropayment API key","Base network API"],"warnings":["No documentation of the response schema — unclear what fields are returned beyond presumably an OpenAI API key","No OpenAPI or machine-readable schema available","Unclear whether the returned OpenAI key is ephemeral, rate-limited, or shared","The broader site lists many endpoints but detailed docs pages returned no content","Security consideration: using a third-party-provided API key means the provider can see all traffic routed through that key"],"endpointUrl":"https://lowpaymentfee.com/api/v1/integrations/openai/key","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/integrations/openai/key","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.450","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation of the response format, and no examples of what the returned payload looks like. The crawled pages beyond the homepage were empty (just 'Connect wallet'). The exact nature of the returned key (ephemeral vs. persistent, usage limits) is 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