{"id":"eb938456-58ec-41d9-9a49-55b7be748f1b","shortId":"TgfvEK","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-25` is part of the lowpaymentfee.com platform, which offers 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 exact scheme on the Base network using USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).\n\nThe specific functionality of `/api/endpoint-25` is unclear — 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's actual functionality is undocumented and the path does not match any cataloged API, treat this as a generic or placeholder premium endpoint. There is no OpenAPI schema, no request/response examples, and no detailed documentation available.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","pay-per-request","json-response","post-method"],"categories":["api","pay-per-use"],"synonyms":["lowpaymentfee","x402 api","usdc api","micropayment api","pay-per-call api","base network api","premium endpoint"],"warnings":["Endpoint path /api/endpoint-25 does not match any documented API on the provider's homepage","No documentation, OpenAPI schema, or request/response examples available","All doc pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt with no content","Actual functionality of this endpoint is unknown — it may be a test or placeholder endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-25","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-25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) but its actual functionality is completely undocumented. The path /api/endpoint-25 does not match any named API on the site, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. This is 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':91 '20':130 '6':139 'accept':70 'access':68,161 'actual':181 'advertis':146,152 'ai/ml':55 'analyt':54 'api':5,19,51,67,154,193 'application/json':74 'asset':90 'avail':215 'base':8,22,86 'base network api' 'base-network' 'catalog':192 'challeng':124 'collect':42 'connect':170 'consist':141 'content':176 'correspond':102 'data':53,58 'decim':140 'detail':213 'document':162,214 'endpoint':6,20,30,63,108,179,202 'exact':82 'exampl':210 'finance/web3':57 'function':94,182 'gate':3,17 'generic':198 'given':138 'handl':78 'homepag':114 'indic':125 'infer':56 'infrastructur':60 'instant':160 'json-response' 'key':155 'label':65 'like':118,135 'limit':158 'list':109 'lowpaymentfee' 'lowpaymentfee.com':37 'match':190 'maximum':127 'micropayment api' 'name':107 'network':87 'offer':40 'openapi':206 'page':163 'part':34 'path':117,187 'pay':10,24,48 'pay-per-call api' 'pay-per-request':9,23,47 'payment':76,128 'per':11,25,49 'placehold':200 'platform':38,151 'post':71 'post-method' 'premium':4,18,66,201 'premium endpoint' 'price':149 'prompt':172 'protocol':46 'provid':112 'rate':157 'request':12,26,50,72 'request/response':209 'respons':75 'return':73,167 'schema':207 'scheme':83 'site':144 'span':52 'specif':93 'substant':175 'treat':194 'unclear':98 'undocu':184 'unit':132 'usdc':14,28,89,134,137 'usdc api' 'usdc-payment' 'use':88,116 'util':61 'via':79 'wallet':171 'x402':2,16,45,81,123 'x402 api' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"4f420463-940c-4f44-b2b0-5adf496063e1","listingId":"eb938456-58ec-41d9-9a49-55b7be748f1b","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-25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:57.889Z"}],"sources":[{"listingId":"eb938456-58ec-41d9-9a49-55b7be748f1b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:57.889Z","lastSeenAt":"2026-04-23T05:00:37.352Z"}],"details":{"listingId":"eb938456-58ec-41d9-9a49-55b7be748f1b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-25 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The provider's homepage lists APIs at $0.02/request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge returns a maxAmountRequired of 20000 USDC units on the Base network for this endpoint","source_url":"https://lowpaymentfee.com/api/endpoint-25"},{"claim":"Documentation pages (/docs, /pricing, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API endpoint with per-request USDC micropayments","Agent-driven API consumption without API keys or subscriptions","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that need keyless, on-demand API access via crypto micropayments","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need well-documented, production-grade APIs with clear schemas","Anyone without a Base-network USDC wallet","Use cases requiring predictable, documented response formats"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T08:04:53.763Z"},"updatedAt":"2026-04-23T05:00:37.352Z"}}