{"id":"b2f8f1fc-d00d-4c02-895d-c5f64af10ac6","shortId":"RXQ6kW","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-request with USDC.","description":"This endpoint at `/api/endpoint-44` is part of lowpaymentfee.com, a platform offering a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities. The endpoint is labeled \"Premium API Access\" and accepts POST requests, returning application/json responses. Payment is handled via the x402 protocol on the Base network using USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nThe specific functionality of `/api/endpoint-44` is not documented — it does not correspond to any of the named endpoints listed on the provider's homepage (which use paths like `/api/v1/...` and `/api/v2/...`). The x402 challenge indicates a maximum payment of 20,000 units of USDC (likely 0.02 USDC given 6 decimals, consistent with the site's advertised $0.02/request pricing). The platform advertises no API keys, no rate limits, and instant access. Documentation pages (`/docs`, `/pricing`, `/README`) returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause the endpoint path does not match any documented API and no input/output schema is provided beyond the basic x402 challenge metadata, the actual capability of this specific endpoint remains unknown. Users should treat this as an opaque premium endpoint until further documentation is available.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","http-post","json-response"],"categories":["api","payments"],"synonyms":["x402 api","pay-per-request api","USDC api","Base network api","lowpaymentfee","micropayment api","crypto-gated endpoint"],"warnings":["Endpoint path /api/endpoint-44 does not correspond to any documented API on the provider's homepage","No input or output schema available beyond basic x402 challenge metadata","All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no content","Actual functionality of this endpoint is unknown — use with caution"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-44","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/endpoint-44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but /api/endpoint-44 does not match any documented API on the site. No input/output schema, no documentation, and all doc pages return only 'Connect wallet'. The actual functionality is unknown, making this effectively a stub 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'/api/v1':119 '/api/v2':121 '/docs':164 '/pricing':165 '/readme':166 '/request':148 '0.02':136,147 '000':131 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':90 '20':130 '6':139 'Base network api' 'USDC api' 'accept':70 'access':68,161 'actual':200 'advertis':146,152 'ai/ml':54 'analyt':53 'api':5,19,50,67,154,186 'application/json':74 'asset':89 'avail':221 'base':8,22,85 'base-network' 'basic':195 'beyond':193 'capabl':201 'challeng':124,197 'collect':41 'connect':170 'consist':141 'content':176 'correspond':102 'crypto-gated endpoint' 'data':52,58 'decim':140 'document':98,162,185,219 'endpoint':6,20,30,63,108,179,205,216 'financ':56 'function':93 'gate':3,17 'given':138 'handl':78 'homepag':114 'http-post' 'indic':125 'infer':55 'infrastructur':60 'input/output':189 'instant':160 'json-response' 'key':155 'label':65 'like':118,135 'limit':158 'list':109 'lowpaymentfee' 'lowpaymentfee.com':36 'match':183 'maximum':127 'metadata':198 'micropayment api' 'name':107 'network':86 'offer':39 'opaqu':214 'page':163 'part':34 'path':117,180 'pay':10,24,47 'pay-per-request':9,23,46 'pay-per-request api' 'payment':76,128 'per':11,25,48 'platform':38,151 'post':71 'premium':4,18,66,215 'price':149 'prompt':172 'protocol':45,82 'provid':112,192 'rate':157 'remain':206 'request':12,26,49,72 'respons':75 'return':73,167 'schema':190 'site':144 'span':51 'specif':92,204 'substant':175 'treat':210 'unit':132 'unknown':207 'usdc':14,28,88,134,137 'usdc-payment' 'use':87,116 'user':208 'util':61 'via':79 'wallet':171 'web3':57 'x402':2,16,44,81,123,196 'x402 api' 'x402-gated':1,15 'x402-payment' 'x402-protocol':43","prices":[{"id":"2bf328a3-c1a4-4c34-b9ce-abbab9282fcc","listingId":"b2f8f1fc-d00d-4c02-895d-c5f64af10ac6","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/endpoint-44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:50.064Z"}],"sources":[{"listingId":"b2f8f1fc-d00d-4c02-895d-c5f64af10ac6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:50.064Z","lastSeenAt":"2026-04-23T05:00:36.939Z"}],"details":{"listingId":"b2f8f1fc-d00d-4c02-895d-c5f64af10ac6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-44\n# Returns 402 with X-PAYMENT challenge; attach a valid x402 payment header (USDC on Base) to complete the request.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies USDC on Base with maxAmountRequired of 20000 and payTo 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/endpoint-44"},{"claim":"The site lists APIs under /api/v1/ and /api/v2/ paths but not /api/endpoint-44","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint via x402 micropayment on Base","Agent-driven pay-per-call API consumption without API keys","Demonstrating x402 protocol integration for USDC payments"],"bestFor":["Developers exploring x402 protocol pay-per-request patterns","AI agents that can handle x402 payment challenges natively","Users who want keyless, on-demand API access paid in USDC"],"notFor":["Users who need well-documented endpoint schemas and behavior before paying","High-volume use cases where per-request crypto payments add overhead","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T08:16:49.964Z"},"updatedAt":"2026-04-23T05:00:36.939Z"}}