{"id":"05b1338f-eafd-4401-bc06-dd1835442a05","shortId":"LWdA52","kind":"x402","title":"x402-gated notification endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated notification endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/notifications/48` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, infrastructure utilities, and notifications. Each request is gated by an x402 payment challenge requiring USDC on the Base network.\n\nThe specific endpoint is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (contract `0x8335…2913` on Base), which equals $0.02 per call (USDC uses 6 decimals). No API keys are needed; payment is made inline via the X-PAYMENT header. The platform advertises no rate limits and instant access.\n\nThe broader lowpaymentfee.com platform offers roughly 16 endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, this specific listing covers only the `/api/v1/notifications/48` endpoint, whose exact response payload and notification functionality are not documented in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","notifications","post-endpoint","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification API","x402 notification","pay-per-call notification","USDC API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact functionality of /api/v1/notifications/48 is undocumented — 'Premium API Access' is generic","No request body schema or response examples found in crawled material","The /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/48","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response payloads, no examples, and the purpose of 'notifications/48' is entirely undocumented. The listing is effectively a stub with confirmed liveness and 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'0.02':9,22,106,182 '000':94 '0x8335':100 '16':143 '20':93 '2913':101 '6':111 'Base network API' 'USDC API' 'accept':83 'access':81,136 'across':145 'advertis':89,130 'ai':154 'ai/ml':51 'analysi':158 'analyt':50,149 'api':47,80,114 'base':7,20,72,95,103 'broader':138 'call':46,108 'categori':147 'challeng':67,88 'classif':160 'collect':38 'contract':99 'convers':176 'cover':189 'crawl':206 'crypto':54 'data':49,148 'decim':112 'document':203 'embed':161 'endpoint':5,18,28,76,144,193 'equal':105 'estim':171 'exact':195 'exchang':166 'export':152 'feed':165 'financ':53,162 'four':146 'function':200 'gas':170 'gate':3,16,62 'generat':177 'geocod':174 'header':127 'howev':185 'infer':52 'infrastructur':55,173 'inlin':121 'insight':153 'instant':135 'key':115 'label':78 'learn':156 'limit':133 'list':188 'lowpaymentfee' 'lowpaymentfee.com':35,139 'machin':155 'made':120 'materi':207 'maxamountrequir':91 'metric':150 'need':117 'network':73 'no-api-key' 'notif':4,17,58,199 'notification API' 'notifications' 'offer':141 'part':32 'pay':8,21,44 'pay-per-cal':43 'pay-per-call notification' 'pay-per-request' 'payload':197 'payment':66,118,126 'per':10,23,45,107,183 'platform':36,129,140 'post':84 'post-endpoint' 'premium':79 'premium API access' 'price':164,180 'protocol':42 'quot':169 'rate':132,167 'report':151 'request':11,24,60,85,184 'requir':68 'respons':196 'rough':142 'sentiment':157 'span':48 'specif':75,187 'summar':159 'token':168 'unit':96 'usdc':13,26,69,98,109 'usdc-base' 'use':110 'util':56 'valid':175 'via':122 'web3':163 'whose':194 'x':125 'x-payment':124 'x402':2,15,41,65,87 'x402 notification' 'x402-gated':1,14 'x402-payment' 'x402-protocol':40","prices":[{"id":"6474bb04-d285-42ca-91f5-f75f2a52880c","listingId":"05b1338f-eafd-4401-bc06-dd1835442a05","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.269Z"}],"sources":[{"listingId":"05b1338f-eafd-4401-bc06-dd1835442a05","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.269Z","lastSeenAt":"2026-04-22T02:32:10.896Z"}],"details":{"listingId":"05b1338f-eafd-4401-bc06-dd1835442a05","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/48 \\\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 x402 challenge requires 20000 base units of USDC on Base (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02 per request","source_url":"https://lowpaymentfee.com/api/v1/notifications/48"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"lowpaymentfee.com offers ~16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving premium notifications via a single paid API call","Integrating pay-per-use notification delivery into agent workflows","Accessing gated notification data without managing API keys or subscriptions"],"bestFor":["Agents needing simple pay-per-call notification access on Base","Developers who want keyless, no-subscription API access","Crypto-native applications that can settle in USDC on Base"],"notFor":["Users who need detailed documentation or OpenAPI schemas before integrating","High-volume notification use cases where per-call pricing is inefficient","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.361Z"},"updatedAt":"2026-04-22T02:32:10.896Z"}}