{"id":"14d1b0f3-3832-4e3c-ac71-eb339830a34a","shortId":"dBgHmJ","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-87 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 priced at $0.02 per request, settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts payment via the \"exact\" scheme on Base, with maxAmountRequired of 20000 base units of USDC (0x8335…2913), which equals $0.02 (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nHowever, the specific functionality of /api/endpoint-87 is unclear. The provider's landing page lists many named endpoints (e.g., /api/v2/ai/sentiment, /api/v1/finance/prices) but does not mention /api/endpoint-87 by name. There is no OpenAPI schema, no request/response documentation, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. Without knowing what this particular endpoint does, callers must treat it as an opaque premium API with unknown input/output behavior.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["api","misc"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API","Base network API","lowpaymentfee","micropayment API"],"warnings":["The specific endpoint /api/endpoint-87 is not listed among the provider's documented APIs — its functionality is unknown.","No OpenAPI schema, request format, or response format documentation is available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no useful content.","The purpose and behavior of this endpoint cannot be determined from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-87","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-87","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) and pricing is clear ($0.02 USDC on Base), but there is no documentation for what /api/endpoint-87 actually does — no OpenAPI schema, no request/response examples, and the docs pages are empty. The specific endpoint is not listed among the provider's named APIs, making it effectively a stub 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'/api/v1/finance/prices':179 '/api/v2/ai/sentiment':178 '/request':12,30 '0.02':11,29,97,136 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':132 '20000':127 '2913':133 '300':149 '6':139 'Base network API' 'USDC API' 'accept':116,154 'access':52 'addit':211 'address':145 'advertis':57 'ai':66 'analysi':70 'analyt':65 'api':6,16,24,34,48,51,200,228 'application/json':159 'base':8,26,105,123,128 'behavior':232 'broad':59 'call':4,22 'caller':220 'challeng':109 'classif':73 'confirm':110 'connect':206 'content':212 'convers':90 'data':64 'decim':140 'doc':197 'document':194 'e.g':177 'embed':74 'endpoint':38,62,93,112,153,176,218 'equal':135 'estim':84 'exact':120 'exchang':79 'feed':78 'financ':75 'function':163 'gas':83 'gate':47 'generat':91 'geocod':88 'howev':160 'http':155 'http-post' 'infrastructur':86 'input/output':231 'json-response' 'key':17,35 'know':214 'label':49 'land':171 'learn':68 'list':173 'live':114 'lowpaymentfee' 'lowpaymentfee.com':41 'lowpaymentfee.com/api/endpoint-87':40 'machin':67 'mani':174 'maxamountrequir':125 'mention':183 'micropayment API' 'must':221 'name':175,186 'network':106 'opaqu':226 'openapi':190 'page':172,201 'particular':217 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payment':117,141 'per':3,21,98 'post':156 'premium':5,23,50,227 'premium API' 'price':77,95,198 'prompt':208 'provid':54,169 'quot':82 'rate':80 'render':203 'request':99 'request/response':193 'requir':18,36 'return':158 'schema':191 'scheme':121 'second':150 'sent':143 'sentiment':69 'settl':100 'site':56 'span':63 'specif':162 'suit':60 'summar':72 'text':71 'timeout':151 'token':81 'treat':222 'unclear':167 'unit':129 'unknown':230 'usdc':14,32,102,131,137 'usdc-base' 'use':138 'util':87 'valid':89 'via':9,27,118 'wallet':207 'web3':76 'without':213 'x402':10,28,46,108 'x402 endpoint' 'x402-gated':45 'x402-payment'","prices":[{"id":"3be718a7-f60f-4954-8218-81f8c4e830b4","listingId":"14d1b0f3-3832-4e3c-ac71-eb339830a34a","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-87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:14.424Z"}],"sources":[{"listingId":"14d1b0f3-3832-4e3c-ac71-eb339830a34a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:14.424Z","lastSeenAt":"2026-04-22T13:30:26.165Z"}],"details":{"listingId":"14d1b0f3-3832-4e3c-ac71-eb339830a34a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-87 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/endpoint-87"},{"claim":"Provider lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request payments in USDC on Base","Exploring x402-gated endpoints for low-cost micro-transactions"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC payments on Base L2","Users who want no-signup, no-API-key access to paid endpoints"],"notFor":["Users who need documented request/response schemas before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.301Z"},"updatedAt":"2026-04-22T13:30:26.165Z"}}