{"id":"8d8c1239-240f-4c80-b01c-8afa8217ae85","shortId":"ZFg64t","kind":"x402","title":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call premium API endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint (endpoint-91) is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are accessed via the x402 payment protocol on the Base network, settling in USDC (USD Coin) with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at /api/endpoint-91 is listed under the generic title \"Premium API Access\" with no further documentation about what it actually does. The x402 challenge confirms it is live and accepts POST requests, requiring up to 20,000 base units of USDC (0.02 USD) per call on the Base network. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at $0.02 per request. However, this particular endpoint (endpoint-91) does not appear in the site's listed API catalog, and no documentation, input schema, or response schema is available for it. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. Without knowing what this endpoint actually returns, callers should treat it as an undocumented endpoint on an otherwise functional platform.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","premium API access"],"warnings":["Endpoint /api/endpoint-91 is not listed in the provider's published API catalog — its purpose is unknown","No input schema or output schema is documented anywhere","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-91","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-91","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, no input/output schema, and endpoint-91 does not appear in the site's published API catalog. The docs/pricing/API pages are all empty beyond a wallet connect prompt. This is effectively a stub 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'/api/endpoint-91':99 '/request':17,34 '0.02':16,33,138,183 '000':133 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '20':132 '300':157 'Base network API' 'USDC pay-per-call' 'accept':126 'access':69,108 'actual':116,236 'addit':229 'address':151 'advertis':162 'ai':58 'analysi':166 'analyt':57 'api':6,23,54,86,107,200,218 'appear':194 'avail':211 'base':9,26,77,134,144 'base-network' 'broader':160 'call':4,21,141 'caller':238 'catalog':201 'challeng':120 'classif':169 'coin':83 'collect':48 'commit':93 'confirm':121 'connect':224 'content':230 'convers':177 'data':56,179 'doc':215 'document':112,204 'embed':170 'endpoint':7,24,36,37,67,97,163,189,190,235,245 'exchang':173 'export':180 'feed':172 'financ':61 'function':249 'generic':104 'geocod':175 'howev':186 'http-post' 'infrastructur':64 'input':205 'key':87 'know':232 'learn':60 'limit':90 'list':101,199 'live':124 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':43 'machin':59 'micropayment API' 'network':78,145 'no-api-key' 'offer':46 'otherwis':248 'page':219 'part':40 'particular':188 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-request':50 'payment':73,147 'per':3,20,52,140,184 'platform':44,161,250 'post':127 'premium':5,22,106 'premium API access' 'price':171,216 'prompt':226 'protocol':74 'rate':89,174 'render':221 'request':53,128,185 'requir':94,129 'respons':208 'return':237 'schema':206,209 'second':158 'sent':149 'sentiment':165 'settl':12,29,79 'site':197 'span':55 'specif':96 'summar':168 'text':167 'timeout':155 'titl':105 'treat':240 'undocu':244 'unit':135 'usd':82,139 'usdc':14,31,81,137 'usdc-settlement' 'util':65 'valid':176 'via':10,27,70 'wallet':225 'web3':62 'without':231 'x402':11,28,72,119 'x402 API' 'x402-payment'","prices":[{"id":"ab0f7131-60d5-4ef5-afed-1241edd3d8f6","listingId":"8d8c1239-240f-4c80-b01c-8afa8217ae85","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-91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:12.058Z"}],"sources":[{"listingId":"8d8c1239-240f-4c80-b01c-8afa8217ae85","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:12.058Z","lastSeenAt":"2026-04-22T15:00:36.926Z"}],"details":{"listingId":"8d8c1239-240f-4c80-b01c-8afa8217ae85","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-91 \\\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 platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge confirms the endpoint is live, accepts POST, and requires up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/endpoint-91"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-91"},{"claim":"The platform lists endpoints for analytics, AI, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to an undocumented premium endpoint via x402 micropayment","Agent-driven API consumption without API key management","Pay-per-use API calls settled on-chain in USDC on Base"],"bestFor":["Developers exploring x402 payment protocol integrations","Agents that need keyless, pay-per-call API access on Base","Testing x402 micropayment flows with low-cost endpoints"],"notFor":["Users who need documented input/output schemas before calling","Production workloads requiring SLA guarantees or detailed documentation","Anyone needing free or subscription-based API access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.424Z"},"updatedAt":"2026-04-22T15:00:36.926Z"}}