{"id":"88258136-f328-429e-a516-8cf1064be913","shortId":"P5Vj3W","kind":"x402","title":"Pay-per-request premium API endpoint on Base network via x402 (USDC).","tagline":"Pay-per-request premium API endpoint on Base network via x402 (USDC).","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/endpoint-2` is listed as \"Premium API Access\" and accepts POST requests. Payment is made in USDC (asset 0x8335…2913) with a maximum amount of 20,000 units (likely 0.02 USDC given 6 decimals), consistent with the site-wide $0.02/request pricing.\n\nThe provider's landing page advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). However, `/api/endpoint-2` does not correspond to any of these named endpoints and its specific functionality is undocumented. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content.\n\nThe endpoint is live and returns a valid x402 402 challenge. No OpenAPI schema, request/response examples, or detailed documentation were found. Without knowing what this endpoint actually does, callers should treat it as an opaque premium API whose behavior must be discovered after payment.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","post-endpoint","json-response"],"categories":["api","payments"],"synonyms":["premium API","x402 endpoint","USDC API","Base network API","micropayment API","lowpaymentfee","pay-per-call API"],"warnings":["The specific functionality of /api/endpoint-2 is undocumented — it does not match any of the named endpoints on the provider's landing page.","No OpenAPI schema, request body format, or response format is available.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no usable content.","The endpoint's purpose must be inferred or discovered after payment; callers assume risk."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-2","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-2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/endpoint-2 is completely unknown. The docs pages are empty beyond a wallet connect prompt. This is effectively a stub 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'/request':92 '0.02':80,91 '000':77 '0x8335':69 '20':76 '2913':70 '402':180 '6':83 'Base network API' 'USDC API' 'accept':60 'access':38,58 'across':101 'actual':197 'advertis':99 'ai':111 'amount':74 'analysi':115 'analyt':105 'api':6,19,36,57,155,207 'asset':68 'base':9,22,46 'behavior':209 'caller':199 'categori':103 'challeng':181 'classif':118 'collect':30 'connect':164 'consist':85 'content':170 'convers':134 'correspond':140 'data':104,108 'decim':84 'detail':188 'discov':212 'doc':154 'document':189 'embed':119 'endpoint':7,20,37,50,100,146,172,196 'estim':129 'exampl':186 'exchang':124 'export':109 'feed':123 'financ':120 'found':191 'four':102 'function':150 'gas':128 'generat':135 'geocod':132 'given':82 'host':28 'howev':136 'infrastructur':131 'insight':110 'json-response' 'know':193 'land':97 'learn':113 'like':79 'list':54 'live':174 'lowpaymentfee' 'lowpaymentfee.com':27 'machin':112 'made':65 'maximum':73 'metric':106 'micropayment API' 'must':210 'name':145 'network':10,23,47 'opaqu':205 'openapi':183 'page':98,159 'pay':2,15,33 'pay-per-call API' 'pay-per-request':1,14,32 'payment':42,63,214 'per':3,16,34 'post':61 'post-endpoint' 'premium':5,18,56,206 'premium API' 'price':93,122,156 'prompt':166 'protocol':43 'provid':95 'quot':127 'rate':125 'readm':158 'report':107 'request':4,17,35,62 'request/response':185 'return':161,176 'schema':184 'sentiment':114 'site':89 'site-wid':88 'specif':49,149 'summar':117 'text':116 'token':126 'treat':201 'undocu':152 'unit':78 'usdc':13,26,67,81 'usdc-base-network' 'valid':133,178 'via':11,24,39 'wallet':165 'web3':121 'whose':208 'wide':90 'without':192 'x402':12,25,41,179 'x402 endpoint' 'x402-payment'","prices":[{"id":"49cc8587-3c28-4248-9859-ae41d43aa4e3","listingId":"88258136-f328-429e-a516-8cf1064be913","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-2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:51.855Z"}],"sources":[{"listingId":"88258136-f328-429e-a516-8cf1064be913","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:51.855Z","lastSeenAt":"2026-04-23T05:00:36.996Z"}],"details":{"listingId":"88258136-f328-429e-a516-8cf1064be913","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-2\n# Returns 402 with x402 payment challenge.\n# Include X-PAYMENT header with a valid x402 payment token (USDC on Base) to access.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with USDC on Base network, maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/endpoint-2"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages returned only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a premium API service with per-request USDC micropayments on Base","Integrating x402-compatible agent workflows that pay for API calls automatically","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that need keyless, pay-as-you-go API access on Base","Projects exploring micropayment-gated API services"],"notFor":["Users who need well-documented API contracts before integrating","High-volume use cases requiring predictable flat-rate pricing","Anyone needing detailed request/response schemas upfront"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:01.859Z"},"updatedAt":"2026-04-23T05:00:36.996Z"}}