{"id":"1860dcd0-a616-4d22-932f-e38ab3c5d2a1","shortId":"dVNY8n","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/endpoint-90`) is labeled \"Premium API Access\" and accepts USDC payments on Base. The x402 challenge confirms the endpoint is live and charges a maximum of 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). Payment is settled on-chain to the specified wallet address, and no API keys or subscriptions are needed.\n\nThe broader lowpaymentfee.com platform advertises endpoints across several 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 utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing. However, the specific endpoint `/api/endpoint-90` does not map to any of the named endpoints on the site's landing page, so its exact functionality is unclear.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what `/api/endpoint-90` actually returns. The endpoint responds to POST requests and declares `application/json` as its MIME type, but input parameters and output format are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api","misc"],"synonyms":["premium API","x402 endpoint","USDC API","Base network API","pay-per-call API","lowpaymentfee","micropayment API"],"warnings":["The endpoint path /api/endpoint-90 does not correspond to any named endpoint on the provider's landing page — its actual functionality is unknown.","Documentation pages (/docs, /api, /pricing, /README) contain no useful content beyond a 'Connect wallet' prompt.","No OpenAPI schema or input/output examples are available; request format must be guessed.","The provider site lists many endpoint categories but offers no technical detail on any of them."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-90","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-90","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 OpenAPI schema, no request/response examples, and the specific function of /api/endpoint-90 is unknown. The docs pages are empty beyond a wallet-connect 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'/request':12,30,169 '0.02':11,29,93,168 '000':87 '20':86 '6':99 'Base network API' 'USDC API' 'accept':68 'access':48,66 'across':126 'actual':233 'addit':217 'address':111 'advertis':124 'ai':136 'analysi':140 'analyt':130 'api':6,16,24,34,46,65,114,203 'application/json':243 'base':8,26,56,72,88 'broader':121 'call':4,22 'categori':128 'chain':106 'challeng':75 'charg':82 'classif':143 'collect':40 'confirm':76 'connect':212 'content':218 'convers':160 'data':129,133 'decim':100 'declar':242 'descript':229 'doc':202 'document':197 'embed':144 'endpoint':47,60,78,125,164,174,184,236 'estim':154 'exact':193 'exampl':226 'exchang':149 'export':134 'extrem':199 'feed':148 'financ':145 'format':253 'function':194 'gas':153 'generat':161 'geocod':158 'host':38 'howev':171 'i.e':92 'infrastructur':156 'input':249 'insight':135 'json-response' 'key':17,35,115 'label':63 'land':189 'learn':138 'list':163 'live':80 'lowpaymentfee' 'lowpaymentfee.com':37,122 'machin':137 'map':178 'maximum':84 'metric':131 'micropayment API' 'mime':246 'name':183 'need':119 'network':57 'no-api-key' 'on-chain':104 'openapi':222 'output':252 'page':190,207 'paramet':250 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,70,101 'per':3,21,44,94 'platform':123 'post':239 'post-method' 'premium':5,23,64 'premium API' 'price':147,170,204 'prompt':214 'protocol':53 'quot':152 'rate':150 'readm':206 'render':209 'report':132 'request':45,95,240 'request/response':225 'requir':18,36 'respond':237 'return':234 'schema':223 'sentiment':139 'settl':103 'sever':127 'share':165 'sinc':96 'site':187 'spars':200 'specif':59,173 'specifi':109 'subscript':117 'summar':142 'text':141 'token':151 'type':247 'unclear':196 'unit':89 'unknown':255 'usdc':14,32,69,91,97 'usdc-base-network' 'use':98 'util':157 'valid':159 'via':9,27,49 'wallet':110,213 'web3':146 'x402':10,28,51,74 'x402 endpoint' 'x402-payment'","prices":[{"id":"791893b2-f501-473e-815f-7d331712ffda","listingId":"1860dcd0-a616-4d22-932f-e38ab3c5d2a1","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-90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:17.455Z"}],"sources":[{"listingId":"1860dcd0-a616-4d22-932f-e38ab3c5d2a1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:17.455Z","lastSeenAt":"2026-04-22T13:30:19.057Z"}],"details":{"listingId":"1860dcd0-a616-4d22-932f-e38ab3c5d2a1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-90 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network, equating to $0.02 per request.","source_url":"https://lowpaymentfee.com/api/endpoint-90"},{"claim":"The landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, API, pricing, and README pages render only a 'Connect wallet' prompt with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a pay-per-call API endpoint without needing API keys or subscriptions","Making on-chain micropayments for API access using USDC on Base","Programmatic agent-driven API consumption via x402 protocol"],"bestFor":["Developers wanting zero-signup API access with crypto micropayments","AI agents that can settle x402 payment challenges autonomously","Users who prefer pay-as-you-go pricing without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","Use cases requiring well-documented input/output schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T19:17:07.778Z"},"updatedAt":"2026-04-22T13:30:19.057Z"}}