{"id":"7502b5aa-00f3-4dac-9430-4615e11d3b35","shortId":"mC7uTp","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call notification endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides a notifications API accessible via the x402 payment protocol. The specific resource `/api/v1/notifications/1` accepts POST requests and charges 20,000 base units of USDC (USD Coin, 6 decimals) on the Base network, which equals $0.02 per request. Payment is handled inline via the X-PAYMENT header — no API keys, accounts, or rate limits are required.\n\nThe provider operates a broader platform offering multiple pay-per-call API categories including 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 endpoints are listed at $0.02 per request and settle on the Base network using USDC.\n\nThe specific functionality of the `/api/v1/notifications/1` endpoint is not documented beyond its title \"Premium API Access.\" No request/response schema, parameter documentation, or usage examples are provided by the site. The endpoint is confirmed live, returning a valid x402 402 challenge with scheme \"exact\" and a 300-second payment timeout.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","notifications-api","no-api-key","no-rate-limit"],"categories":["notifications","infrastructure"],"synonyms":["notification service","push notification API","alert endpoint","pay-per-use API","x402 notification","USDC micropayment API","lowpaymentfee"],"warnings":["No documentation exists for the /api/v1/notifications/1 endpoint — its actual functionality is unknown.","No request body schema or response schema is provided; callers cannot know what to send or expect back.","The site's /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content.","The endpoint title 'Premium API Access' is generic and does not describe the service."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/1","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/v1/notifications/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation on what the notifications endpoint actually does, no request/response schema, and no examples. The endpoint's purpose beyond its generic title is entirely unknown, making it effectively a stub 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'/request':16,32 '0.02':15,31,72,147 '000':57 '20':56 '300':203 '402':196 '6':64 'USDC micropayment API' 'accept':51 'access':41,173 'account':88 'ai':116 'alert endpoint' 'analysi':120 'analyt':110 'api':40,86,106,172 'base':8,24,58,68,154 'base-network' 'beyond':168 'broader':98 'call':4,20,105 'categori':107 'challeng':197 'charg':55 'classif':123 'coin':63 'confirm':190 'convers':140 'data':109,113 'decim':65 'document':167,178 'embed':124 'endpoint':6,22,34,143,164,188 'equal':71 'estim':134 'exact':200 'exampl':181 'exchang':129 'export':114 'feed':128 'financ':125 'function':160 'gas':133 'generat':141 'geocod':138 'handl':77 'header':84 'includ':108 'infrastructur':136 'inlin':78 'insight':115 'key':87 'learn':118 'limit':91 'list':145 'live':191 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':117 'metric':111 'multipl':101 'network':69,155 'no-api-key' 'no-rate-limit' 'notif':5,21,39 'notification service' 'notifications-api' 'offer':100 'oper':96 'paramet':177 'pay':2,18,103 'pay-per-cal':1,17,102 'pay-per-call' 'pay-per-use API' 'payment':45,75,83,205 'per':3,19,73,104,148 'platform':99 'post':52 'premium':171 'price':127 'protocol':46 'provid':37,95,183 'push notification API' 'quot':132 'rate':90,130 'report':112 'request':53,74,149 'request/response':175 'requir':93 'resourc':49 'return':192 'schema':176 'scheme':199 'second':204 'sentiment':119 'settl':11,27,151 'site':186 'specif':48,159 'summar':122 'text':121 'timeout':206 'titl':170 'token':131 'unit':59 'usag':180 'usd':62 'usdc':13,29,61,157 'usdc-settlement' 'use':156 'util':137 'valid':139,194 'via':9,25,42,79 'web3':126 'x':82 'x-payment':81 'x402':10,26,44,195 'x402 notification' 'x402-payment'","prices":[{"id":"6ad376d2-d7fd-417f-bef2-0e1f3e55b7e9","listingId":"7502b5aa-00f3-4dac-9430-4615e11d3b35","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/v1/notifications/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.994Z"}],"sources":[{"listingId":"7502b5aa-00f3-4dac-9430-4615e11d3b35","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.994Z","lastSeenAt":"2026-04-22T02:32:10.503Z"}],"details":{"listingId":"7502b5aa-00f3-4dac-9430-4615e11d3b35","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/1 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/1"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/1"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Sending or triggering notifications via a single paid API call","Agent-initiated alerts or messages without requiring account setup","Testing x402 payment flows with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents needing a simple pay-per-call notification trigger","Use cases requiring no API key or account registration"],"notFor":["Production notification systems requiring documented SLAs and schemas","High-volume notification delivery where per-call pricing is inefficient","Users who need detailed request/response documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.821Z"},"updatedAt":"2026-04-22T02:32:10.503Z"}}