{"id":"e6d6ef11-dd76-47cd-b9ef-9e5cd64e9993","shortId":"FZuLSN","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"This endpoint at lowpaymentfee.com/api/endpoint-82 is an x402-gated API labeled \"Premium API Access.\" The provider's site advertises a broad suite of endpoints spanning data & analytics, AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at a flat $0.02 per request, settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and requiring payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments. The payTo address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the maximum timeout is 300 seconds.\n\nHowever, this specific endpoint path (/api/endpoint-82) does not appear in the provider's listed API catalog, which uses versioned paths like /api/v1/ and /api/v2/. There is no documentation, OpenAPI schema, or example request/response available for this endpoint. The docs, pricing, and other pages on the site returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually does or what input it expects, its practical utility is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["general","api-gateway"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["Endpoint path /api/endpoint-82 does not appear in the provider's published API catalog — its function is unknown","No OpenAPI schema, request format, or response format documented","All non-homepage pages (docs, pricing, api, README) returned only 'Connect wallet' with no content","Cannot confirm what data or service this endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-82","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-82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and confirms pricing and network, but the specific endpoint (/api/endpoint-82) is not documented anywhere on the provider's site. No OpenAPI schema, no request/response examples, and no description of what this endpoint actually does. Docs pages are empty. This is effectively a stub 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'/api/v1':193 '/api/v2':195 '/request':12,30 '0.02':11,29,99,138 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '0x8335':132 '20':126 '2913':133 '300':170 '6':136 'Base network API' 'USDC API' 'accept':117 'access':52 'actual':233 'address':162 'advertis':57 'ai':66 'analysi':70 'analyt':65 'api':6,16,24,34,48,51,151,186 'appear':180 'avail':205 'base':8,26,107,128,135 'base-network' 'broad':59 'call':4,22,140 'catalog':187 'challeng':111 'classif':73 'commit':159 'confirm':112 'connect':221 'content':227 'convers':90 'data':64 'decim':137 'doc':210 'document':199 'embed':74 'endpoint':38,62,93,114,175,208,232 'estim':84 'exact':147 'exampl':203 'exchang':79 'expect':239 'feed':78 'financ':75 'flat':98 'gas':83 'gate':47 'generat':91 'geocod':88 'howev':172 'http-post' 'infrastructur':86 'input':237 'key':17,35,152 'know':229 'label':49 'learn':68 'like':192 'limit':155 'list':95,185 'live':116 'lowpaymentfee' 'lowpaymentfee.com':41 'lowpaymentfee.com/api/endpoint-82':40 'machin':67 'made':143 'maximum':167 'micropayment API' 'network':108 'no-api-key' 'openapi':200 'page':214 'path':176,191 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':122,141 'payto':161 'per':3,21,100,139 'post':118 'practic':241 'premium':5,23,50 'premium API' 'price':77,211 'prompt':223 'provid':54,183 'quot':82 'rate':80,154 'request':101,119 'request/response':204 'requir':18,36,121 'return':218 'schema':201 'scheme':148 'second':171 'sentiment':69 'settl':102 'site':56,217 'span':63 'specif':174 'substant':226 'suit':60 'summar':72 'text':71 'timeout':168 'token':81 'unclear':244 'unit':129 'upfront':158 'usdc':14,32,104,131 'usdc-settlement' 'use':189 'util':87,242 'valid':89 'version':190 'via':9,27,144 'wallet':222 'web3':76 'without':228 'x402':10,28,46,110,146 'x402 endpoint' 'x402-gated':45 'x402-payment'","prices":[{"id":"5c30933f-c993-427d-b230-f7773ab39623","listingId":"e6d6ef11-dd76-47cd-b9ef-9e5cd64e9993","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-82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:25.780Z"}],"sources":[{"listingId":"e6d6ef11-dd76-47cd-b9ef-9e5cd64e9993","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:25.780Z","lastSeenAt":"2026-04-22T13:30:30.973Z"}],"details":{"listingId":"e6d6ef11-dd76-47cd-b9ef-9e5cd64e9993","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-82 \\\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 lists endpoints at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/endpoint-82"},{"claim":"The provider advertises categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, pay-as-you-go API access on Base","Low-volume consumers who want per-request billing with no commitments"],"notFor":["Users who need documented, well-specified API contracts before integrating","High-volume production workloads requiring SLAs and support","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.871Z"},"updatedAt":"2026-04-22T13:30:30.973Z"}}