{"id":"e046a28d-10bb-4c8b-a870-54b2e86f64ff","shortId":"268Vay","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/30` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. 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, requesting a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per call. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using the \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised; access is instant upon payment.\n\nThe exact functionality behind the `/notifications/30` path is not documented in the crawled material. The provider's landing page lists many endpoint categories (analytics, AI, finance, utilities) but does not specifically describe a notifications endpoint. The response MIME type is `application/json`. Without further documentation or example responses, the precise data returned by this endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key","notifications"],"categories":["infrastructure"],"synonyms":["notifications API","premium API access","x402 notifications","lowpaymentfee","pay-per-call API","USDC API","Base network API"],"warnings":["No documentation exists for the /api/v1/notifications/30 endpoint specifically; it is not listed on the provider's landing page","No request body schema or response schema available — actual functionality is unclear","Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","The endpoint name 'Premium API Access' is generic and does not describe what the endpoint does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/30","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for the /notifications/30 path specifically, no request/response schema, and no examples. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The endpoint's actual functionality is 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'/notifications/30':152 '/request':16,32 '0.02':15,31,116 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':124 '0x8335':108 '20':102 '2913':109 '300':131 '6':112 'Base network API' 'USDC API' 'accept':87 'access':85,142 'address':123 'advertis':141 'ai':171 'ai/ml':56 'analyt':55,170 'api':52,84,135 'application/json':187 'base':8,24,74,104,111 'base-network' 'behind':150 'call':4,20,118 'categori':169 'challeng':92 'confirm':93 'crawl':159 'data':54,196 'decim':113 'describ':178 'document':156,190 'endpoint':6,22,34,63,78,95,168,181,200 'equal':115 'exact':127,148 'exampl':192 'financ':172 'finance/web3':58 'function':149 'infer':57 'infrastructur':60 'instant':144 'json-response' 'key':136 'label':82 'land':164 'limit':139 'list':166 'live':97 'lowpaymentfee' 'lowpaymentfee.com':41 'made':121 'mani':167 'materi':160 'maximum':100 'mime':184 'network':75 'no-api-key' 'notif':5,21,180 'notifications' 'notifications API' 'offer':44 'page':165 'part':38 'path':153 'pay':2,18,49 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':48 'payment':67,119,146 'per':3,19,50,117 'platform':42 'post':88 'precis':195 'premium':83 'premium API access' 'probe':79 'protocol':68 'provid':162 'rate':138 'remain':201 'request':51,89,98 'respons':183,193 'return':197 'scheme':128 'second':132 'settl':11,27,69 'span':53 'specif':77,177 'suit':46 'timeout':133 'type':185 'unclear':202 'unit':105 'upon':145 'usdc':13,29,71,107 'usdc-settlement' 'use':64,125 'util':61,173 'via':9,25 'without':188 'x402':10,26,66,91 'x402 notifications' 'x402-payment'","prices":[{"id":"f1e32678-1396-4d02-aad9-a430aee06b62","listingId":"e046a28d-10bb-4c8b-a870-54b2e86f64ff","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.292Z"}],"sources":[{"listingId":"e046a28d-10bb-4c8b-a870-54b2e86f64ff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.292Z","lastSeenAt":"2026-04-22T04:02:46.761Z"}],"details":{"listingId":"e046a28d-10bb-4c8b-a870-54b2e86f64ff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/30 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/notifications/30"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not list a notifications endpoint","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notifications via a pay-per-call model without API key management","Agent-driven workflows that need on-demand notification access settled in USDC","Integrating low-cost notification services into Web3 applications"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents with x402 payment capability on Base","Projects needing simple USDC-settled API calls without subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume notification use cases where per-call pricing is inefficient","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.214Z"},"updatedAt":"2026-04-22T04:02:46.761Z"}}