{"id":"647b5cce-d3d8-4434-803d-604911f4abdd","shortId":"c32J8G","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-23` is part of lowpaymentfee.com, a platform offering a variety of x402-gated API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. The specific 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 x402 challenge indicates a maximum payment of 20,000 units of USDC (which, given USDC's 6 decimal places, corresponds to $0.02 per request). The platform advertises a flat $0.02/request pricing model with no API keys, no rate limits, no minimums, and instant access. However, the specific functionality of `/api/endpoint-23` is not documented — it does not appear in the site's listed API catalog, which uses versioned paths like `/api/v1/` and `/api/v2/`. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nWithout documentation or schema details for this particular endpoint, it is unclear what input it expects or what output it produces beyond JSON. The endpoint is confirmed live (402 challenge captured), but its actual purpose remains unknown.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","json-response","post-method","pay-per-request"],"categories":["api","payments"],"synonyms":["premium API","x402 endpoint","USDC API","Base network API","pay-per-call API","lowpaymentfee","micropayment API"],"warnings":["Endpoint /api/endpoint-23 does not appear in the provider's published API catalog — its purpose is undocumented.","All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no content.","No input or output schema is available; the outputSchema in the challenge only specifies HTTP method and discoverability.","The actual service behind this endpoint is unknown — it could be a placeholder or test endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-23","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-23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but /api/endpoint-23 is not listed in the site's API catalog, has no documentation, no input/output schema, and the docs/pricing/README pages are empty. The actual functionality of this specific endpoint is completely 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'/api/v1':160 '/api/v2':162 '/request':120 '0.02':111,119 '000':98 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':88 '20':97 '402':208 '6':106 'Base network API' 'USDC API' 'accept':68 'access':66,134 'actual':213 'advertis':116 'ai':51 'analyt':50 'api':5,19,46,65,125,153 'appear':147 'application/json':72 'asset':87 'base':8,22,83 'base-network' 'beyond':201 'captur':210 'catalog':154 'challeng':91,209 'confirm':206 'connect':173 'content':179 'correspond':109 'data':49 'decim':107 'detail':184 'doc':164 'document':143,181 'endpoint':6,20,30,47,61,188,204 'expect':195 'financ':54 'flat':118 'function':138 'gate':3,17,45 'given':103 'handl':76 'howev':135 'indic':92 'infrastructur':57 'input':193 'instant':133 'json':202 'json-response' 'key':126 'label':63 'learn':53 'like':159 'limit':129 'list':152 'live':207 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':52 'maximum':94 'micropayment API' 'minimum':131 'model':122 'network':84 'offer':39 'output':198 'page':168 'part':34 'particular':187 'path':158 'pay':10,24 'pay-per-call API' 'pay-per-request':9,23 'payment':74,95 'per':11,25,112 'place':108 'platform':38,115 'post':69 'post-method' 'premium':4,18,64 'premium API' 'price':121,165 'produc':200 'prompt':175 'protocol':80 'purpos':214 'rate':128 'readm':167 'remain':215 'request':12,26,70,113 'respons':73 'return':71,170 'schema':183 'site':150 'span':48 'specif':60,137 'substant':178 'unclear':191 'unit':99 'unknown':216 'usdc':14,28,86,101,104 'usdc-payment' 'use':85,156 'util':58 'varieti':41 'version':157 'via':77 'wallet':174 'web3':55 'without':180 'x402':2,16,44,79,90 'x402 endpoint' 'x402-gated':1,15,43 'x402-payment'","prices":[{"id":"a4f78f57-7c50-43d7-8fb5-5d27ac302d4f","listingId":"647b5cce-d3d8-4434-803d-604911f4abdd","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-23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:47.123Z"}],"sources":[{"listingId":"647b5cce-d3d8-4434-803d-604911f4abdd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:47.123Z","lastSeenAt":"2026-04-23T05:00:36.820Z"}],"details":{"listingId":"647b5cce-d3d8-4434-803d-604911f4abdd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-23 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, no minimums, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies USDC on Base with maxAmountRequired of 20000 (i.e., $0.02).","source_url":"https://lowpaymentfee.com/api/endpoint-23"}],"useCases":["Programmatic access to an undocumented premium API endpoint via x402 micropayments","Agent-driven API consumption without API keys using on-chain USDC payments","Testing x402 payment flows on the Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-request API access on Base","Exploring micropayment-gated endpoints"],"notFor":["Users who need documented input/output schemas before integrating","Production workloads requiring SLA guarantees or detailed documentation"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T08:48:22.164Z"},"updatedAt":"2026-04-23T05:00:36.820Z"}}