{"id":"decb712d-e0b1-4f36-bd5d-12080347d90b","shortId":"GCscQp","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/11` is part of the lowpaymentfee.com platform, which offers a broad suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints are gated via the x402 payment protocol, settling in USDC on the Base network. The specific endpoint listed here is described as \"Premium API Access\" and sits under a notifications path, though no further documentation clarifies what notification data it returns or accepts.\n\nPricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). The platform advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each POST request. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nBecause the endpoint path (`/notifications/11`) is not listed on the provider's landing page and no OpenAPI schema, request body format, or response examples are documented, the actual functionality of this specific endpoint is unclear. The crawled docs and pricing pages returned only a wallet-connect prompt with no additional detail. Callers should treat this as an opaque paid endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","notifications","post-method"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification endpoint","x402 notification","lowpaymentfee notifications","paid notification API","Base USDC API"],"warnings":["No documentation exists for the /api/v1/notifications/11 endpoint — its purpose is unclear","This endpoint path is not listed among the provider's advertised APIs on the landing page","No OpenAPI spec, request schema, or response examples are available","Crawled /api, /pricing, and /README pages returned no useful content (only wallet-connect prompts)"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/11","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, no documentation for this specific notifications path, and the crawled pages beyond the landing page returned only wallet-connect prompts. Functionality is essentially 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'/notifications/11':165 '0.02':11,26,109,123 '000':115 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':153 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':160 '20':114 '6':121 'Base USDC API' 'accept':106 'access':88,135 'actual':188 'addit':211 'address':152 'advertis':126 'ai/ml':55 'analyt':54 'api':51,87,128 'attach':138 'base':8,23,76,116,159 'bodi':180 'broad':44 'call':4,19 'caller':136,213 'clarifi':99 'connect':207 'contract':157 'crawl':197 'crypto':58 'data':53,102 'decim':122 'describ':84 'detail':212 'doc':198 'document':98,186,224 'endpoint':6,21,32,63,80,163,193,221 'exampl':184 'financ':57 'format':181 'function':189 'gate':65 'header':142 'infer':56 'instant':134 'key':129 'land':173 'limit':132 'list':81,168 'lowpaymentfee notifications' 'lowpaymentfee.com':39 'maxamountrequir':112 'network':77 'notif':5,20,93,101 'notification endpoint' 'notifications' 'offer':42 'opaqu':219 'openapi':177 'page':174,201 'paid':220 'paid notification API' 'part':36 'path':94,164 'pay':2,17,48 'pay-per-cal':1,16 'pay-per-request':47 'payment':69,141,148 'per':3,12,18,27,49,110 'platform':40,125 'post':145 'post-method' 'premium':86 'premium API access' 'price':107,200 'prompt':208 'protocol':70 'provid':171 'rate':131 'request':13,28,50,111,146,179 'respons':183 'return':104,202 'schema':178 'sent':150 'servic':61 'settl':71 'simpli':137 'sit':90 'span':52 'specif':79,192 'suit':45 'surfac':225 'though':95 'treat':215 'unclear':195 'unit':117 'usdc':15,30,73,119,156 'usdc-base' 'use':154 'util':60 'via':9,24,66 'wallet':206 'wallet-connect':205 'x402':10,25,68,140 'x402 notification' 'x402-payment'","prices":[{"id":"605265de-8da2-46b7-a3f0-8454bd0b282c","listingId":"decb712d-e0b1-4f36-bd5d-12080347d90b","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/11","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.037Z"}],"sources":[{"listingId":"decb712d-e0b1-4f36-bd5d-12080347d90b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/11","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.037Z","lastSeenAt":"2026-04-22T02:32:10.575Z"}],"details":{"listingId":"decb712d-e0b1-4f36-bd5d-12080347d90b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/11 \\\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","source_url":"https://lowpaymentfee.com/api/v1/notifications/11"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/11"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving or triggering notifications via a pay-per-call model without API keys","Integrating low-cost notification services into agent workflows settled on Base","Testing x402 payment flows against a live, inexpensive endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents needing keyless, per-call access to notification data","Low-volume consumers who prefer pay-as-you-go over subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume notification pipelines where $0.02/request adds up quickly","Anyone requiring non-crypto payment rails"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.729Z"},"updatedAt":"2026-04-22T02:32:10.575Z"}}