{"id":"3d23a1d2-5a1b-4601-aa9d-13d53b7dd879","shortId":"5YFw6M","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/37` 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/37` path is unclear — the site's landing page lists categories like Data & Analytics, AI & ML, Finance & Web3, and Infrastructure utilities, but does not specifically document a notifications endpoint. There is no OpenAPI spec, no detailed request/response schema, and the crawled docs pages (pricing, README, /api) all returned only a \"Connect wallet\" prompt with no further content. Treat this listing as a stub until the provider publishes documentation for the notifications resource.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications","post-method"],"categories":["notifications","infrastructure"],"synonyms":["x402 notification API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee notifications","premium API access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /notifications/37 path is not listed on the provider's landing page — its purpose is unknown","Pricing, README, and API doc pages returned no useful content beyond 'Connect wallet'","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/37","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/37","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 no OpenAPI spec, no request/response schema, no documentation for the notifications endpoint, and the crawled pages beyond the landing page are empty. The actual functionality of this specific endpoint is 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'/api/v1/notifications/37':36 '/notifications/37':154 '/request':16,32 '0.02':15,31,117 '000':104 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':125 '0x8335':109 '20':103 '2913':110 '300':130 '6':113 'Base network API' 'USDC micropayment endpoint' 'accept':88 'access':86,140 'address':124 'advertis':139 'ai':168 'ai/ml':56 'analyt':55,167 'api':52,85,133 'base':8,24,75,105,112 'base-network' 'behind':152 'call':4,20,147 'categori':164 'challeng':93 'collect':46 'confirm':94 'connect':204 'content':210 'crawl':194 'crypto':59 'data':54,166 'decim':114 'detail':189 'doc':195 'document':179,221 'endpoint':6,22,34,64,79,96,182 'equal':116 'exact':150 'financ':58,170 'function':151 'gate':142 'infer':57 'infrastructur':173 'key':134 'label':83 'land':161 'like':165 'limit':137 'list':163,213 'live':98 'lowpaymentfee notifications' 'lowpaymentfee.com':41 'made':122 'maximum':101 'ml':169 'network':76 'notif':5,21,181,224 'notifications' 'offer':44 'openapi':186 'page':162,196 '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 'post':89 'post-method' 'premium':84 'premium API access' 'price':197 'probe':80 'prompt':206 'protocol':69 'provid':219 'publish':220 'pure':143 'rate':136 'readm':198 'request':51,90,119 'request/response':190 'requir':99 'resourc':225 'return':201 'schema':191 'second':131 'servic':62 'settl':11,27,70 'site':159 'span':53 'spec':187 'specif':78,178 'stub':216 'timeout':128 'treat':211 'unclear':157 'unit':106 'usdc':13,29,72,108 'usdc-settlement' 'use':65 'util':61,174 'via':9,25 'wallet':205 'web3':171 'x402':10,26,67,92 'x402 notification API' 'x402-payment'","prices":[{"id":"baad4fb8-fcbe-4dd1-a24d-d56f7bac1352","listingId":"3d23a1d2-5a1b-4601-aa9d-13d53b7dd879","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.222Z"}],"sources":[{"listingId":"3d23a1d2-5a1b-4601-aa9d-13d53b7dd879","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.222Z","lastSeenAt":"2026-04-22T04:02:46.691Z"}],"details":{"listingId":"3d23a1d2-5a1b-4601-aa9d-13d53b7dd879","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/37 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/37"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/37"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Agent-driven workflows that need to trigger notification events and pay per invocation","Integrating low-cost notification services into crypto-native applications on Base"],"bestFor":["Developers wanting keyless, pay-per-use API access settled on-chain","AI agents that can autonomously pay for API calls via x402","Projects already operating on the Base L2 with USDC liquidity"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume notification use cases where per-call pricing is impractical","Developers without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.295Z"},"updatedAt":"2026-04-22T04:02:46.691Z"}}