{"id":"4260cfe9-1707-4731-abe5-03a6a548de30","shortId":"MjvzW9","kind":"x402","title":"x402-gated API key endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated API key endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints on the lowpaymentfee.com platform, which offers a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind per-request x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/54` is listed as \"Premium API Access\" and costs $0.02 per call (the x402 challenge advertises a maxAmountRequired of 20000 base units of USDC, which at 6 decimals equals $0.02). Payment is made via the x402 exact scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts POST requests and returns `application/json`.\n\nThe platform advertises a simple pricing model: $0.02 per request across all endpoints, with no API keys required, no rate limits, and instant access. However, the exact functionality of this particular endpoint (`/api/v1/apikeys/54`) is unclear — the name suggests it may generate or retrieve an API key, but no documentation or schema details are available beyond the x402 challenge metadata. The docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","post-method"],"categories":["infrastructure"],"synonyms":["api key generation","premium api access","x402 api","micropayment api","pay-per-call api","base network api","usdc payment endpoint"],"warnings":["No documentation available — docs, pricing, and README pages all render only a 'Connect wallet' prompt with no content.","The exact purpose of /api/v1/apikeys/54 is unclear; the name suggests API key provisioning but no schema or description confirms this.","No request body schema or response schema is provided.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/54","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/apikeys/54","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, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs pages only show a wallet-connect prompt. The actual functionality of this specific endpoint is 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'pay-per-call api' 'payment':40,117 'per':11,25,73,97,151 'per-request':72 'per-request-micropayment' 'platform':51,144 'post':138 'post-method' 'premium':34,91 'premium api access' 'price':148,204 'prompt':214 'protocol':41 'provid':33 'rate':162 'readm':206 'render':209 'request':12,26,74,139,152 'requir':160 'retriev':185 'return':141 'schema':193 'scheme':124 'settl':77 'simpl':147 'span':58 'specif':85 'substant':217 'suggest':180 'suit':55 'unclear':177 'unit':108 'usdc':14,28,79,110,130 'usdc payment endpoint' 'usdc-base' 'use':128 'util':68 'via':37,120 'wallet':213 'web3':65 'x402':2,16,39,75,100,122,199 'x402 api' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"dfd6579a-f7e3-4ae5-8c14-2b79af047fbd","listingId":"4260cfe9-1707-4731-abe5-03a6a548de30","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/apikeys/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:39.772Z"}],"sources":[{"listingId":"4260cfe9-1707-4731-abe5-03a6a548de30","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:39.772Z","lastSeenAt":"2026-04-23T05:01:54.929Z"}],"details":{"listingId":"4260cfe9-1707-4731-abe5-03a6a548de30","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/54 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/54"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/54"}],"useCases":["Acquiring an API key or premium access token via a single micropayment","Programmatic pay-per-use access without traditional subscription or signup","Agent-driven API key provisioning on the Base network"],"bestFor":["Developers wanting no-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation before purchasing","Anyone without a Base-network USDC wallet","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.632Z"},"updatedAt":"2026-04-23T05:01:54.929Z"}}