{"id":"d2158299-67a0-4ab5-b8ad-2ea279201026","shortId":"DcGBSA","kind":"x402","title":"x402-gated notification endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated notification endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at `/api/v1/notifications/44` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs settled in USDC on the Base network. The specific function of the `/notifications/44` path is not documented beyond the generic label \"Premium API Access,\" so its exact behavior is unclear. It accepts POST requests and returns `application/json`.\n\nThe platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and no minimum commitments. The x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units of USDC (USD Coin, 6 decimals = $0.02) on the Base network, paid to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The x402 version is 1 with the \"exact\" payment scheme and a 300-second timeout.\n\nThe broader lowpaymentfee.com platform offers endpoints across several categories including data/analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance/Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). However, the `/api/v1/notifications/44` endpoint does not appear in any of these documented categories, making its purpose uncertain. No OpenAPI schema, detailed documentation, or example request/response payloads are available for this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method","notifications"],"categories":["infrastructure"],"synonyms":["notification API","premium API access","x402 notification","lowpaymentfee","pay-per-call API","USDC API","Base network API"],"warnings":["The /api/v1/notifications/44 endpoint is not listed among the platform's documented API categories — its purpose is unknown.","No OpenAPI spec, request schema, or response examples are available for this endpoint.","No documentation pages returned meaningful content (pricing, README, and /api pages only show 'Connect wallet').","The endpoint description 'Premium API Access' is generic and shared across the platform; it does not describe this endpoint's specific function."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/44","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/44","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 confirmed) and pricing is clear ($0.02 USDC on Base). However, the specific /notifications/44 endpoint is not documented anywhere on the site, there is no OpenAPI schema, no request/response examples, and the endpoint's actual functionality is unknown. This is effectively a stub 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'/notifications/44':60 '0.02':9,22,90,130 '000':121 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '1':143 '20':120 '300':151 '6':128 'Base network API' 'USDC API' 'accept':79 'access':71 'across':93,160 'address':137 'advertis':87 'ai/ml':165 'analysi':167 'api':47,70,99 'appear':193 'application/json':84 'avail':214 'base':7,20,53,122,133 'base-network' 'behavior':75 'beyond':65 'broader':155 'call':46 'categori':162,199 'challeng':110 'classif':169 'coin':127 'collect':38 'commit':107 'confirm':111 'convers':185 'data/analytics':164 'decim':129 'detail':207 'document':64,198,208 'embed':170 'endpoint':5,18,28,96,113,159,190,218 'estim':179 'exact':74,146 'exampl':210 'exchang':174 'feed':173 'finance/web3':171 'flat':89 'function':57 'gas':178 'gate':3,16 'generat':186 'generic':67 'geocod':183 'howev':187 'includ':163 'infrastructur':181 'json-response' 'key':100 'label':68 'limit':103 'live':115 'lowpaymentfee' 'lowpaymentfee.com':35,156 'make':200 'maximum':118 'minimum':106 'network':54,134 'notif':4,17 'notification API' 'notifications' 'offer':158 'openapi':205 'paid':135 'part':32 'path':61 'pay':8,21,44 'pay-per-cal':43 'pay-per-call API' 'pay-per-request' 'payload':212 'payment':147 'per':10,23,45,91 'platform':36,86,157 'post':80 'post-method' 'premium':69 'premium API access' 'price':172 'protocol':42 'purpos':202 'quot':177 'rate':102,175 'request':11,24,81,92,116 'request/response':211 'return':83 'schema':206 'scheme':148 'second':152 'sentiment':166 'settl':48 'sever':161 'specif':56,217 'summar':168 'timeout':153 'token':176 'uncertain':203 'unclear':77 'unit':123 'usd':126 'usdc':13,26,50,125 'usdc-settlement' 'util':182 'valid':184 'version':141 'x402':2,15,41,109,140 'x402 notification' 'x402-gated':1,14 'x402-payment' 'x402-protocol':40","prices":[{"id":"9ac31c1e-c7ba-4a83-ae53-20502f0b9b05","listingId":"d2158299-67a0-4ab5-b8ad-2ea279201026","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/44","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.069Z"}],"sources":[{"listingId":"d2158299-67a0-4ab5-b8ad-2ea279201026","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/44","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.069Z","lastSeenAt":"2026-04-22T04:02:46.529Z"}],"details":{"listingId":"d2158299-67a0-4ab5-b8ad-2ea279201026","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/44 \\\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 platform charges $0.02 per request with no API keys, no rate limits, and no minimums.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/notifications/44"},{"claim":"Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/notifications/44"},{"claim":"The platform offers endpoints across data/analytics, AI/ML, finance/Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notifications via a pay-per-call model without API key management","Integrating low-cost notification functionality into agent workflows using x402 micropayments","Accessing premium notification data with instant USDC settlement on Base"],"bestFor":["Developers wanting keyless, pay-per-use API access","Agent systems that can settle x402 payments in USDC on Base","Use cases requiring low-friction, low-cost API calls without subscriptions"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integration","High-volume notification workloads where per-call pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.526Z"},"updatedAt":"2026-04-22T04:02:46.529Z"}}