{"id":"b454b4fb-3eb9-4ea4-b4a6-8de1926c9a46","shortId":"WLx86t","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/81` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance/Web3, and infrastructure utilities. All endpoints use the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint listed here is described as \"Premium API Access\" and costs $0.02 per request (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme to a designated wallet address on Base. The endpoint accepts POST requests and returns `application/json` responses. However, the crawled landing page does not list a `/notifications/81` route among its advertised APIs, and no documentation was found describing what this particular notification endpoint does or what request/response payloads look like.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 per-call price point. Without specific documentation for the notifications endpoint, its exact functionality remains unclear.","tags":[],"capabilities":["x402-payment","per-call-pricing","usdc-base","notifications","json-response","no-api-key","post-method"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","pay-per-call API","x402 notification","lowpaymentfee","USDC API","Base network API","micropayment API"],"warnings":["The /api/v1/notifications/81 endpoint is not listed among the platform's advertised APIs on the landing page — its purpose is unclear.","No request or response schema is documented; the outputSchema only specifies HTTP POST method.","No OpenAPI spec, README, or detailed docs were found (pricing and README pages returned only 'Connect wallet').","Functionality of this specific endpoint is entirely inferred from its generic 'Premium API Access' description."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/81","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/81","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the /notifications/81 path is not listed among the platform's advertised APIs. Functionality is essentially 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'/notifications/81':141 '0.02':11,26,96,199 '000':100 '20':99 '6':106 'Base network API' 'USDC API' 'accept':69,125 'access':93 'address':120 'advertis':145,168 'ai/ml':54 'among':143 'analysi':177 'analyt':53 'api':50,74,92,146 'application/json':130 'base':8,23,67,101,122 'broader':166 'call':4,19,202 'categori':169 'classif':180 'collect':44 'commit':81 'convers':192 'cost':95 'crawl':134 'data':52,173 'decim':107 'describ':89,152 'design':118 'document':149,207 'embed':181 'endpoint':6,21,32,60,85,124,157,211 'estim':189 'exact':114,213 'exchang':184 'export':174 'feed':183 'finance/web3':55 'found':151 'function':214 'gas':188 'generat':194 'geocod':190 'howev':132 'includ':170 'infrastructur':57 'insight':175 'json-response' 'key':75 'land':135 'like':164 'limit':78 'list':86,139 'look':163 'lowpaymentfee' 'lowpaymentfee.com':39 'made':110 'metric':171 'micropayment API' 'network':68 'no-api-key' 'notif':5,20,156,210 'notification API' 'notifications' 'offer':42 'page':136 'part':36 'particular':155 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payload':162 'payment':71,108 'per':3,12,18,27,48,97,201 'per-cal':200 'per-call-pricing' 'platform':40,167 'point':204 'post':126 'post-method' 'premium':91 'premium API access' 'price':182,203 'protocol':64 'quot':187 'rate':77,185 'remain':215 'report':172 'request':13,28,49,98,127 'request/response':161 'requir':82 'respons':131 'return':129 'rout':142 'scheme':115 'sentiment':176 'span':51 'specif':84,206 'summar':179 'text':178 'token':186 'unclear':216 'unit':102 'usdc':15,30,70,104 'usdc-base' 'use':61 'util':58 'valid':191 'via':9,24,111 'wallet':119 'without':205 'x402':10,25,63,113 'x402 notification' 'x402-payment'","prices":[{"id":"7dac2b5a-9cfb-4d53-87dc-73cbd5e4bf01","listingId":"b454b4fb-3eb9-4ea4-b4a6-8de1926c9a46","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.974Z"}],"sources":[{"listingId":"b454b4fb-3eb9-4ea4-b4a6-8de1926c9a46","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.974Z","lastSeenAt":"2026-04-22T04:02:46.399Z"}],"details":{"listingId":"b454b4fb-3eb9-4ea4-b4a6-8de1926c9a46","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/81 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, exact scheme, on Base network, requiring 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/notifications/81"},{"claim":"The platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories but does not include a /notifications endpoint.","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notifications via a single paid API call","Integrating pay-per-use notification services into agent workflows","Accessing premium notification data without subscription commitments"],"bestFor":["Agents needing simple pay-per-call notification access on Base","Developers who want no-signup, no-API-key access to notification endpoints","Micropayment-based workflows that settle in USDC on Base L2"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","High-volume notification use cases where per-call pricing is inefficient","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.607Z"},"updatedAt":"2026-04-22T04:02:46.399Z"}}