{"id":"6411f8b3-30dc-4af8-9b36-56cca7a0dcb7","shortId":"ADEgeY","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/8` is part of the lowpaymentfee.com platform, which offers a suite 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 function of the `/notifications/8` endpoint is not documented beyond the label \"Premium API Access\"; it likely delivers some form of notification or alert data, but the exact payload and input parameters are not described in any available documentation.\n\nPricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02), consistent with the uniform pricing shown across all endpoints on the platform. The platform advertises no API keys, no rate limits, no minimums, and instant access — callers simply attach an x402 payment header to each POST request. The x402 challenge is live and returns a well-formed version-1 challenge with a 300-second payment timeout.\n\nDocumentation is extremely sparse. There is no OpenAPI spec, no request/response schema, and no usage examples. The crawled pages beyond the landing page returned only a \"Connect wallet\" prompt with no additional content. The endpoint's specific behavior, accepted input fields, and response format are unknown.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","notifications","post-endpoint"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification API","pay-per-call API","x402 notification","lowpaymentfee notifications","USDC API","Base network API"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unknown","The exact purpose of /api/v1/notifications/8 is undocumented; 'Premium API Access' is a generic label","No request body schema or response schema provided; callers must discover behavior empirically","All non-landing crawled pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/8","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/8","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 well-formed, confirming the endpoint exists and accepts payments. However, there is no OpenAPI spec, no request/response schema, no examples, and no documentation explaining what this endpoint actually does beyond the generic label 'Premium API Access'. The specific purpose of '/notifications/8' is entirely 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'/api/v1/notifications/8':34 '/notifications/8':80 '0.02':11,26,117,131 '000':123 '20':122 '300':185 '6':129 'Base network API' 'USDC API' 'accept':227 'access':90,157 'across':138 'addit':220 'advertis':146 'ai/ml':54 'alert':99 'analyt':53 'api':50,89,148 'attach':160 'avail':113 'base':8,23,73,124 'base-network' 'behavior':226 'beyond':85,208 'call':4,19 'caller':158 'challeng':171,182 'connect':215 'consist':132 'content':221 'crawl':206 'crypto':57 'data':52,100 'decim':130 'deliv':93 'describ':110 'document':84,114,189 'endpoint':6,21,32,62,81,140,223 'exact':103 'exampl':204 'extrem':191 'field':229 'financ':56 'form':95,179 'format':232 'function':77 'header':164 'infer':55 'input':106,228 'instant':156 'key':149 'label':87 'land':210 'like':92 'limit':152 'live':173 'lowpaymentfee notifications' 'lowpaymentfee.com':39 'maxamountrequir':120 'minimum':154 'network':74 'notif':5,20,97 'notification API' 'notifications' 'offer':42 'openapi':196 'page':207,211 'paramet':107 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payload':104 'payment':66,163,187 'per':3,12,18,27,48,118 'per-request-billing' 'platform':40,143,145 'post':167 'post-endpoint' 'premium':88 'premium API access' 'price':115,136 'prompt':217 'protocol':67 'rate':151 'request':13,28,49,119,168 'request/response':199 'respons':231 'return':175,212 'schema':200 'second':186 'servic':60 'settl':68 'shown':137 'simpli':159 'span':51 'spars':192 'spec':197 'specif':76,225 'suit':44 'timeout':188 'uniform':135 'unit':125 'unknown':234 'usag':203 'usdc':15,30,70,127 'usdc-settlement' 'use':63 'util':59 'version':180 'via':9,24 'wallet':216 'well':178 'well-form':177 'x402':10,25,65,162,170 'x402 notification' 'x402-payment'","prices":[{"id":"f2ee89ba-0a5c-42ac-9c18-f29c7a26c5a6","listingId":"6411f8b3-30dc-4af8-9b36-56cca7a0dcb7","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.881Z"}],"sources":[{"listingId":"6411f8b3-30dc-4af8-9b36-56cca7a0dcb7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.881Z","lastSeenAt":"2026-04-22T04:02:46.308Z"}],"details":{"listingId":"6411f8b3-30dc-4af8-9b36-56cca7a0dcb7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/8 \\\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 x402 challenge returns maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/notifications/8"},{"claim":"Platform advertises $0.02 per request, no API keys, no rate limits, no minimums, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base uses 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching notification or alert data on a pay-per-request basis without API key management","Integrating low-cost notification lookups into agent workflows via x402 micropayments","Accessing premium notification content settled instantly on Base L2"],"bestFor":["Agents or services that need simple, keyless access to notification data","Developers experimenting with x402 pay-per-call patterns on Base","Low-volume consumers who prefer per-request pricing over subscriptions"],"notFor":["High-volume notification consumers who need bulk pricing or rate guarantees","Users who require detailed API documentation and typed schemas before integration","Anyone needing non-USDC or non-Base settlement options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.757Z"},"updatedAt":"2026-04-22T04:02:46.308Z"}}