{"id":"b7b9651d-85fb-4598-baf3-a875dfca599c","shortId":"3LeDWw","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/notifications/52` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific endpoint listed here is labeled \"Premium API Access\" and sits under a notifications path, though the provider does not document what the notification resource actually returns or accepts.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. The maximum amount required is 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request. Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by micropayment.\n\nThe provider's landing page lists many other endpoints at $0.02 each across categories like sentiment analysis, text summarization, geocoding, price feeds, and more. However, the `/api/v1/notifications/52` endpoint is not listed on the homepage, and no documentation describes its input format, expected payload, or response schema. Without further docs, the exact functionality of this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","notifications","post-endpoint"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification API","x402 notification","lowpaymentfee notification","micropayment API","pay-per-call API"],"warnings":["No documentation exists for /api/v1/notifications/52 — its purpose, input format, and response structure are unknown.","This endpoint is not listed on the provider's homepage among their advertised APIs.","No OpenAPI spec, no examples, and no README content was retrievable from the site.","The exact nature of 'Premium API Access' at a notifications path is ambiguous."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/52","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation for this specific endpoint — no input schema, no response schema, no description of what 'notifications/52' does. The endpoint isn't even listed on the provider's own homepage. This is effectively a stub 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'0.02':11,26,133,172 '000':123 '0x8335':128 '20':122 '300':145 'accept':104,114 'access':84,156 'across':174 'actual':101 'advertis':155 'ai/ml':54 'amount':119 'analysi':178 'analyt':53 'api':50,83,149 'base':8,23,73,124,130 'base-network' 'call':4,19 'categori':175 'challeng':107 'confirm':108 'crypto':57 'data':52 'describ':199 'doc':210 'document':96,198 'endpoint':6,21,32,62,77,110,170,189,217 'equal':132 'exact':141,212 'expect':203 'feed':183 'financ':56 'format':202 'function':213 'gate':158 'geocod':181 'homepag':195 'howev':186 'infer':55 'input':201 'key':150 'label':81 'land':165 'like':176 'limit':153 'list':78,167,192 'live':112 'lowpaymentfee notification' 'lowpaymentfee.com':39 'made':138 'mani':168 'maximum':118 'micropay':161 'micropayment API' 'network':74 'notif':5,20,89,99 'notification API' 'notifications' 'offer':42 'page':166 'part':36 'particular':216 'path':90 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payload':204 'payment':66,136 'per':3,12,18,27,48,134 'platform':40 'post':115 'post-endpoint' 'premium':82 'premium API access' 'price':182 'protocol':67 'provid':93,163 'pure':159 'rate':152 'remain':218 'request':13,28,49,116,135 'requir':120 'resourc':100 'respons':206 'return':102 'schema':207 'scheme':142 'second':146 'sentiment':177 'servic':60 'settl':68 'sit':86 'span':51 'specif':76 'suit':44 'summar':180 'text':179 'though':91 'timeout':147 'unclear':219 'unit':125 'usdc':15,30,70,127 'usdc-micropayment' 'use':63 'util':59 'via':9,24,139 'without':208 'x402':10,25,65,106 'x402 notification' 'x402-payment'","prices":[{"id":"31b7e449-8caf-453e-ad54-40e3fbdea6fe","listingId":"b7b9651d-85fb-4598-baf3-a875dfca599c","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.212Z"}],"sources":[{"listingId":"b7b9651d-85fb-4598-baf3-a875dfca599c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.212Z","lastSeenAt":"2026-04-22T02:32:10.813Z"}],"details":{"listingId":"b7b9651d-85fb-4598-baf3-a875dfca599c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/52 \\\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 x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/52"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/52"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notifications via a single paid API call","Agent-driven workflows that need to send or fetch notification data without API key management","Programmatic access to a notification resource gated by USDC micropayment"],"bestFor":["Developers wanting keyless, pay-per-use API access on Base","AI agents with x402 payment capability needing notification functionality","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume notification use cases where per-call pricing adds up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.461Z"},"updatedAt":"2026-04-22T02:32:10.813Z"}}