{"id":"d159981c-0da2-4179-9939-c3ddf89afb52","shortId":"txGhPf","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/16` 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. All endpoints on the platform share a uniform pricing model of $0.02 per request, settled in USDC on the Base network with no API keys, rate limits, or subscriptions required.\n\nThe specific endpoint probed (`/api/v1/notifications/16`) is listed under the title \"Premium API Access\" but its exact functionality is unclear — the name suggests a notification-related resource (possibly retrieving or triggering a specific notification by ID), but no documentation, request schema, or response schema is available beyond the x402 challenge. The endpoint is live and returns a valid x402 payment challenge (version 1, scheme \"exact\") requesting up to 20,000 base units of USDC (0.02 USD given 6 decimals) to wallet `0x1A2B…85F3` on Base. The method is POST and the output MIME type is `application/json`.\n\nThe broader lowpaymentfee.com platform advertises roughly 16 endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment, summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All share the same $0.02 USDC pricing. No OpenAPI spec, detailed docs, or example payloads were found during the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","notification-api","json-response"],"categories":["notifications","infrastructure"],"synonyms":["notification endpoint","premium API","x402 notification","lowpaymentfee","pay-per-call API","USDC API","Base network API"],"warnings":["No API documentation, OpenAPI spec, or request/response schema available","The exact functionality of /api/v1/notifications/16 is undocumented — 'Premium API Access' is a generic label","No examples of successful responses were found","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/16","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/16","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 no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/notifications/16 is unclear. The platform landing page provides only a brief catalog listing with uniform pricing. This is effectively a stub 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'/request':16,32 '0.02':15,31,75,168,234 '000':163 '0x1a2b':175 '1':156 '16':196 '20':162 '6':171 '85f3':176 'Base network API' 'USDC API' 'access':106 'across':198 'advertis':194 'ai':207 'ai/ml':57 'analyt':56,202 'api':53,87,105 'application/json':189 'avail':139 'base':7,23,83,164,178 'beyond':140 'broader':191 'call':11,27 'categori':200 'challeng':143,154 'classif':212 'collect':44 'convers':228 'crawl':249 'crypto':60 'data':55,201 'decim':172 'detail':240 'doc':241 'document':132 'embed':213 'endpoint':5,21,34,65,96,145,197 'estim':223 'exact':109,158 'exampl':243 'exchang':218 'export':205 'feed':217 'financ':59,214 'found':246 'four':199 'function':110 'gas':222 'gate':3,19 'generat':229 'geocod':226 'given':170 'id':129 'infer':58 'infrastructur':225 'insight':206 'json-response' 'key':88 'learn':209 'limit':90 'list':100 'live':147 'lowpaymentfee' 'lowpaymentfee.com':41,192 'machin':208 'method':180 'metric':203 'mime':186 'model':73 'name':114 'network':84 'notif':4,20,118,127 'notification endpoint' 'notification-api' 'notification-rel':117 'openapi':238 'output':185 'part':38 'pay':9,25,50 'pay-per-cal':8,24 'pay-per-call API' 'pay-per-request':49 'payload':244 'payment':153 'per':10,26,51,76 'platform':42,68,193 'possibl':121 'post':182 'premium':104 'premium API' 'price':72,216,236 'probe':97 'protocol':48 'quot':221 'rate':89,219 'relat':119 'report':204 'request':52,77,133,159 'requir':93 'resourc':120 'respons':136 'retriev':122 'return':149 'rough':195 'schema':134,137 'scheme':157 'sentiment':210 'servic':63 'settl':78 'share':69,231 'span':54 'spec':239 'specif':95,126 'subscript':92 'suggest':115 'summar':211 'titl':103 'token':220 'trigger':124 'type':187 'unclear':112 'uniform':71 'unit':165 'usd':169 'usdc':13,29,80,167,235 'usdc-base' 'util':62 'valid':151,227 'version':155 'wallet':174 'web3':215 'x402':2,18,47,142,152 'x402 notification' 'x402-gated':1,17 'x402-payment' 'x402-protocol':46","prices":[{"id":"35a27fcc-f2cf-4888-a168-0c1fa34b15da","listingId":"d159981c-0da2-4179-9939-c3ddf89afb52","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.959Z"}],"sources":[{"listingId":"d159981c-0da2-4179-9939-c3ddf89afb52","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.959Z","lastSeenAt":"2026-04-22T02:32:10.453Z"}],"details":{"listingId":"d159981c-0da2-4179-9939-c3ddf89afb52","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/16 \\\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 endpoint returns a valid x402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/16"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers ~16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/16"}],"useCases":["Retrieving or triggering a specific notification via a pay-per-call model","Integrating low-cost notification services into agent workflows","Testing x402 payment flows with a cheap live endpoint"],"bestFor":["Developers exploring x402 protocol integrations","Agents needing simple pay-per-request notification access","Low-cost experimentation with crypto-settled APIs"],"notFor":["Production notification systems requiring documented SLAs and schemas","Users who need detailed API documentation before integrating","High-volume notification pipelines where per-call pricing adds up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.824Z"},"updatedAt":"2026-04-22T02:32:10.453Z"}}