{"id":"7ce5760c-2153-40c7-9f7d-a37805cf0e20","shortId":"umrkM6","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call notification endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/notifications/39` is part of the lowpaymentfee.com platform, which offers a collection 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 probed here is labeled \"Premium API Access\" and accepts POST requests.\n\nThe x402 challenge confirms the endpoint is live, requiring a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds. No API keys or rate limits are advertised; access is gated purely by per-call payment.\n\nThe exact functionality behind the `/notifications/39` path is unclear — the provider's landing page does not list this specific route among its documented APIs, and no OpenAPI schema, request/response examples, or detailed documentation were found. The broader platform advertises categories like analytics, AI, finance, and infrastructure utilities, all at the same $0.02 price point. Without further documentation, the precise behavior of this notification endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notification-api","no-api-key","post-method"],"categories":["notifications","infrastructure"],"synonyms":["premium api access","notification endpoint","x402 api","pay-per-call api","lowpaymentfee","base usdc api","micropayment api"],"warnings":["The /api/v1/notifications/39 path is not listed among the provider's documented APIs — its exact functionality is unverified.","No OpenAPI spec, request body schema, or response schema is available.","No detailed documentation was found; /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt.","The purpose of 'notifications/39' (the '39' path segment) is unexplained — it may be a resource ID or a fixed route."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/39","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/39","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 with clear pricing, but there is no OpenAPI schema, no request/response examples, and the specific /notifications/39 route is not documented on the provider's landing page. The actual functionality is unknown, making this effectively a stub 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'/notifications/39':154 '/request':16,32 '0.02':15,31,117,200 '000':104 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':125 '0x8335':109 '20':103 '2913':110 '300':130 '6':113 'accept':88 'access':86,140 'address':124 'advertis':139,187 'ai':191 'ai/ml':56 'among':169 'analyt':55,190 'api':52,85,133,172 'base':8,24,75,105,112 'base usdc api' 'base-network' 'behavior':208 'behind':152 'broader':185 'call':4,20,147 'cannot':213 'categori':188 'challeng':93 'collect':46 'confirm':94,215 'crypto':59 'data':54 'decim':114 'detail':180 'document':171,181,205 'endpoint':6,22,34,64,79,96,212 'equal':116 'exact':150 'exampl':178 'financ':58,192 'found':183 'function':151 'gate':142 'infer':57 'infrastructur':194 'key':134 'label':83 'land':161 'like':189 'limit':137 'list':165 'live':98 'lowpaymentfee' 'lowpaymentfee.com':41 'made':122 'maximum':101 'micropayment api' 'network':76 'no-api-key' 'notif':5,21,211 'notification endpoint' 'notification-api' 'offer':44 'openapi':175 'page':162 'part':38 'path':155 'pay':2,18,49 'pay-per-cal':1,17 'pay-per-call api' 'pay-per-request':48 'payment':68,120,148 'per':3,19,50,118,146 'per-cal':145 'platform':42,186 'point':202 'post':89 'post-method' 'precis':207 'premium':84 'premium api access' 'price':201 'probe':80 'protocol':69 'provid':159 'pure':143 'rate':136 'request':51,90,119 'request/response':177 'requir':99 'rout':168 'schema':176 'second':131 'servic':62 'settl':11,27,70 'span':53 'specif':78,167 'timeout':128 'unclear':157 'unit':106 'usdc':13,29,72,108 'usdc-settlement' 'use':65 'util':61,195 'via':9,25 'without':203 'x402':10,26,67,92 'x402 api' 'x402-payment'","prices":[{"id":"5dd69862-272a-479b-a2a0-9517f5545608","listingId":"7ce5760c-2153-40c7-9f7d-a37805cf0e20","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.264Z"}],"sources":[{"listingId":"7ce5760c-2153-40c7-9f7d-a37805cf0e20","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.264Z","lastSeenAt":"2026-04-22T04:02:46.728Z"}],"details":{"listingId":"7ce5760c-2153-40c7-9f7d-a37805cf0e20","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/39 \\\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 x402 challenge requiring 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/notifications/39"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists APIs in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure, but does not list /api/v1/notifications/39.","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notifications via a single paid API call","Integrating pay-per-use notification delivery into agent workflows","Accessing premium notification data without subscription or API key management"],"bestFor":["Agents needing simple pay-per-call access without authentication setup","Low-volume or sporadic notification API usage where subscriptions are wasteful","Crypto-native workflows that can settle USDC on Base"],"notFor":["High-volume notification use cases where per-call pricing becomes expensive","Users who need detailed API documentation and guaranteed SLAs","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.256Z"},"updatedAt":"2026-04-22T04:02:46.728Z"}}