{"id":"91622f17-4f52-4ca0-8e44-6ade60f64948","shortId":"wC9VPs","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/15` 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 being listed here is described only as \"Premium API Access\" with no further documentation on what the notification resource returns or what input it expects.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. The maximum amount required is 20,000 base units of USDC (0x8335… on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you pay per call with no subscription or commitment. The payment timeout is 300 seconds.\n\nDocumentation is extremely sparse. The landing page lists many endpoints but provides no request/response schemas, no parameter descriptions, and no example payloads for any of them. The `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt with no additional content. Without knowing what data this notification endpoint returns or what parameters it accepts, integration requires experimentation.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","notifications-api","no-api-key","post-method"],"categories":["notifications","infrastructure"],"synonyms":["premium api access","notification endpoint","pay-per-call api","x402 notification","lowpaymentfee","micropayment api","base usdc api"],"warnings":["No documentation exists for this specific endpoint — its purpose and behavior are unknown","No request or response schema available; integration requires blind experimentation","The /api, /pricing, and /README pages contain no useful content beyond 'Connect wallet'","The endpoint path includes a hardcoded ID (15) with no explanation of what it references"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/15","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/15","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, but there is zero documentation on what the notifications/15 resource does, what parameters it accepts, or what it returns. No OpenAPI spec, no examples, and the site's docs pages are empty. This is effectively a stub 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'/api/v1/notifications/15':34 '/pricing':193 '/readme':195 '0.02':11,26,131 '000':121 '0x8335':126 '20':120 '300':163 '6':136 'accept':112,221 'access':87,149 'addit':207 'advertis':140 'ai/ml':54 'amount':117 'analyt':53 'api':50,86,142 'base':8,23,73,122,128 'base usdc api' 'base-network' 'call':4,19,153 'challeng':105 'collect':44 'commit':158 'confirm':106 'connect':202 'content':208 'crypto':57 'data':52,212 'decim':137 'describ':82 'descript':182 'document':91,165 'endpoint':6,21,32,62,77,108,174,215 'equal':130 'exampl':185 'expect':102 'experiment':224 'extrem':167 'financ':56 'infer':55 'input':100 'instant':148 'integr':222 'key':143 'know':210 'land':170 'limit':146 'list':79,172 'live':110 'lowpaymentfee' 'lowpaymentfee.com':39 'mani':173 'maximum':116 'micropayment api' 'minim':201 'network':74 'no-api-key' 'notif':5,20,95,214 'notification endpoint' 'notifications-api' 'offer':42 'page':171,196 'paramet':181,219 'part':36 'pay':2,17,47,151 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request':46 'payload':186 'payment':66,160 'per':3,12,18,27,48,132,152 'per-request-billing' 'platform':40,139 'post':113 'post-method' 'premium':85 'premium api access' 'prompt':204 'protocol':67 'provid':176 'rate':145 'request':13,28,49,114,133 'request/response':178 'requir':118,223 'resolv':198 'resourc':96 'return':97,216 'schema':179 'second':164 'servic':60 'settl':68 'span':51 'spars':168 'specif':76 'subscript':156 'timeout':161 'unit':123 'usdc':15,30,70,125,134 'usdc-settlement' 'use':63,135 'util':59 'via':9,24 'wallet':203 'without':209 'x402':10,25,65,104 'x402 notification' 'x402-payment'","prices":[{"id":"972b418a-ca6a-4e21-be76-f13caa774b57","listingId":"91622f17-4f52-4ca0-8e44-6ade60f64948","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.995Z"}],"sources":[{"listingId":"91622f17-4f52-4ca0-8e44-6ade60f64948","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.995Z","lastSeenAt":"2026-04-22T02:32:10.510Z"}],"details":{"listingId":"91622f17-4f52-4ca0-8e44-6ade60f64948","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/15 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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/15"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/15"}],"useCases":["Fetching or triggering notifications via a pay-per-call model without API key management","Integrating low-cost notification services into agent workflows that support x402","Testing x402 payment protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing a simple pay-per-request notification endpoint","Projects that want to avoid API key provisioning and subscriptions"],"notFor":["Production notification systems requiring documented schemas and SLAs","Use cases needing free or high-volume notification delivery","Anyone requiring detailed documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.82Z"},"updatedAt":"2026-04-22T02:32:10.510Z"}}