{"id":"fc6181af-f0a3-4099-a3a9-d0ab615c5eeb","shortId":"jgY2Uq","kind":"x402","title":"x402-gated notification endpoint on Base, pay-per-call with USDC at $0.02/request.","tagline":"x402-gated notification endpoint on Base, pay-per-call with USDC at $0.02/request.","description":"This endpoint at `/api/v1/notifications/38` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific resource is labeled \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled in USDC on the Base network.\n\nThe x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all listed endpoints. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof. The endpoint returns application/json.\n\nThe specific functionality behind `/api/v1/notifications/38` is not documented on the provider's landing page — the site lists analytics, AI, finance, and utility endpoints but does not mention a notifications category. The endpoint ID \"38\" suggests a resource-specific or parameterized notification endpoint, but without further documentation its exact behavior is unclear. The platform overall advertises no API keys, no rate limits, and instant access.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","notifications","json-response","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification endpoint","x402 notification","pay-per-call API","USDC API","Base network API","lowpaymentfee"],"warnings":["The /api/v1/notifications/38 endpoint is not listed among the provider's documented APIs; its exact functionality is unknown.","No request body schema or response schema is available — callers must discover behavior empirically.","The /pricing, /api, and /README pages returned no meaningful content (only 'Connect wallet').","The notification endpoint ID '38' suggests a parameterized resource but no documentation explains the parameter space."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/38","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the /notifications/38 resource specifically — it does not appear on the provider's landing page. No request/response schema, no examples, and the /api, /pricing, and /README pages returned only a wallet-connect prompt with no useful 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'/request':16,32,118 '0.02':15,31,108,117 '000':99 '20':98 '38':183 '6':104 'Base network API' 'USDC API' 'accept':73 'access':71,214 'across':120 'advertis':94,205 'ai':168 'ai/ml':57 'analyt':56,167 'api':53,70,125,207 'application/json':149 'attach':134 'base':7,23,89,100 'base-network' 'behavior':199 'behind':153 'call':11,27 'caller':132 'categori':179 'challeng':81,93 'collect':44 'consist':111 'crypto':60 'data':55 'decim':105 'document':157,196 'endpoint':5,21,34,123,147,172,181,192 'equal':107 'exact':198 'financ':59,169 'function':152 'gate':3,19,76 'header':139 'id':182 'infer':58 'instant':213 'json-response' 'key':126,208 'label':68 'land':162 'limit':129,211 'list':122,166 'lowpaymentfee' 'lowpaymentfee.com':41 'maxamountrequir':96 'mention':176 'network':90 'no-api-key' 'notif':4,20,178,191 'notification endpoint' 'notifications' 'overal':204 'page':163 'parameter':190 'part':38 'pay':9,25,50 'pay-per-cal':8,24 'pay-per-call API' 'pay-per-request':49 'payment':80,82,138,144 'per':10,26,51,109 'platform':42,203 'post':74 'premium':69 'premium API access' 'price':119 'proof':145 'protocol':48 'provid':160 'rate':128,210 'request':52,75,110 'requir':131 'resourc':66,187 'resource-specif':186 'return':148 'servic':63 'settl':84 'simpli':133 'site':114,165 'span':54 'specif':65,151,188 'suggest':184 'unclear':201 'uniform':116 'unit':101 'usdc':13,29,86,103 'usdc-settlement' 'util':62,171 'valid':142 'without':194 'x':137 'x-payment':136 'x402':2,18,47,79,92,143 'x402 notification' 'x402-gated':1,17 'x402-payment' 'x402-protocol':46","prices":[{"id":"cabcf997-3454-4ae0-a849-16db289b55ac","listingId":"fc6181af-f0a3-4099-a3a9-d0ab615c5eeb","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.969Z"}],"sources":[{"listingId":"fc6181af-f0a3-4099-a3a9-d0ab615c5eeb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.969Z","lastSeenAt":"2026-04-22T04:02:46.399Z"}],"details":{"listingId":"fc6181af-f0a3-4099-a3a9-d0ab615c5eeb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/38 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/38"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/38"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists analytics, AI, finance, and utility endpoints but does not list a notifications category","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notifications via a pay-per-call model without needing API keys","Integrating low-cost notification services into agent workflows settled on Base","Testing x402 payment protocol integrations with a live, inexpensive endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing simple pay-per-call notification access on Base","Low-volume, no-commitment API consumption without subscription overhead"],"notFor":["High-volume notification use cases where per-request pricing adds up","Users who need detailed API documentation or guaranteed SLAs","Anyone requiring non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.647Z"},"updatedAt":"2026-04-22T04:02:46.399Z"}}