{"id":"5e1b0a4d-2a70-46af-bcda-a397bac8b194","shortId":"mNjnht","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-75`) is listed as \"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, with a 300-second timeout.\n\nThe broader lowpaymentfee.com platform 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). All listed endpoints share the same $0.02/request pricing. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, this particular endpoint path (`/api/endpoint-75`) does not correspond to any of the named endpoints on the landing page, and no documentation, input/output schema, or example responses are available. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what `/api/endpoint-75` actually does or what request/response format it expects, this listing is essentially a stub with confirmed liveness but unknown functionality.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["Endpoint path /api/endpoint-75 does not match any documented endpoint on the landing page","No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No input or output schema provided; unknown what this endpoint actually does","Cannot verify what service or data this endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-75","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-75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, the specific endpoint path /api/endpoint-75 is not documented anywhere on the site, no input/output schema exists, no example requests or responses are available, and all documentation pages returned only 'Connect wallet' with no content. Functionality is entirely 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'/request':12,30,166 '0.02':11,29,94,165 '000':88 '20':87 '300':115 '6':100 'Base network API' 'USDC API' 'accept':69 'access':48,67,179 'across':124 'actual':231 'address':112 'advertis':122 'ai':134 'analysi':138 'analyt':128 'api':6,16,24,34,46,66,172,211 'avail':208 'base':8,26,56,73,89 'broader':119 'call':4,22 'categori':126 'chain':107 'challeng':76 'charg':83 'classif':141 'collect':40 'confirm':77,246 'connect':220 'content':226 'convers':157 'correspond':188 'data':127,131 'decim':101 'doc':210 'document':201 'embed':142 'emphas':170 'endpoint':47,60,79,123,161,183,194 'essenti':242 'estim':152 'exampl':205 'exchang':147 'expect':238 'export':132 'feed':146 'financ':143 'format':236 'four':125 'function':250 'gas':151 'generat':158 'geocod':155 'host':38 'howev':180 'i.e':93 'infrastructur':154 'input/output':202 'insight':133 'instant':178 'json-response' 'key':17,35,173 'know':228 'land':197 'learn':136 'limit':176 'list':63,160,240 'live':81,247 'lowpaymentfee' 'lowpaymentfee.com':37,120 'machin':135 'maximum':85 'metric':129 'micropayment API' 'name':193 'network':57 'no-api-key' 'on-chain':105 'page':198,215 'particular':182 'path':184 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':52,71,102 'per':3,21,44,95 'platform':121,169 'premium':5,23,65 'premium API access' 'price':145,167,212 'prompt':222 'protocol':53 'quot':150 'rate':148,175 'readm':214 'report':130 'request':45,96 'request/response':235 'requir':18,36 'respons':206 'return':217 'schema':203 'second':116 'sentiment':137 'settl':104 'share':162 'sinc':97 'specif':59 'specifi':110 'stub':244 'substant':225 'summar':140 'text':139 'timeout':117 'token':149 'unit':90 'unknown':249 'usdc':14,32,70,92,98 'usdc-base' 'use':99 'valid':156 'via':9,27,49 'wallet':111,221 'web3':144 'without':227 'x402':10,28,51,75 'x402 API' 'x402-payment'","prices":[{"id":"6926b7f9-e0e7-4f0d-aba9-2baa0feefa89","listingId":"5e1b0a4d-2a70-46af-bcda-a397bac8b194","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-75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:48.121Z"}],"sources":[{"listingId":"5e1b0a4d-2a70-46af-bcda-a397bac8b194","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:48.121Z","lastSeenAt":"2026-04-22T23:00:59.266Z"}],"details":{"listingId":"5e1b0a4d-2a70-46af-bcda-a397bac8b194","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-75 \\\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 on Base network with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/endpoint-75"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-75"},{"claim":"Docs, pricing, API, and README pages returned only 'Connect wallet' with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-request endpoint without needing API key registration","Agent-driven workflows that settle per-call costs in USDC on Base","Testing x402 payment protocol integrations"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC micropayments on Base","Users who want keyless, pay-as-you-go API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring known input/output schemas before integration","High-volume use cases where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.761Z"},"updatedAt":"2026-04-22T23:00:59.266Z"}}