{"id":"8468ef03-4715-42cf-b3ce-cfbd029d7d4b","shortId":"m4TAqF","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/82` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests gated by an x402 payment challenge. Payment is settled in USDC on the Base network at $0.02 per request (maxAmountRequired of 20,000 base units with 6 decimals = $0.02). No API keys or rate limits are advertised; access is granted purely via the x402 payment header.\n\nThe platform lists 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 are priced uniformly at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/notifications/82`) does not appear in the site's public catalog, so its exact functionality is unclear — the path suggests a notification-related resource, but no documentation describes its input or output schema.\n\nThe x402 challenge is live and well-formed (version 1, scheme \"exact\", USDC on Base, 300-second timeout). No OpenAPI spec, ai-plugin manifest, or detailed documentation was found during the crawl. The pricing and /README pages returned only a wallet-connect prompt with no additional content.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","notification-api","http-post"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification endpoint","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee"],"warnings":["The /api/v1/notifications/82 endpoint does not appear in the provider's public API catalog — its purpose is undocumented.","No OpenAPI spec, ai-plugin manifest, or endpoint documentation was found.","The /pricing and /README pages returned only a wallet-connect prompt with no useful content.","Input and output schemas are completely unknown; example requests/responses cannot be provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/82","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/82","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 pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation of request/response schemas, and the specific /notifications/82 endpoint is not listed in the site's own catalog. Functionality must be entirely guessed from the URL 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'/readme':239 '0.02':9,22,86,98,159 '000':92 '1':212 '16':120 '20':91 '300':218 '6':96 'USDC micropayment API' 'accept':67 'access':65,107 'across':122 'addit':250 'advertis':106 'ai':131,225 'ai-plugin':224 'ai/ml':51 'analyt':50,126 'api':47,64,100 'appear':172 'base':7,20,83,93,217 'call':46 'catalog':178 'categori':124 'challeng':75,204 'classif':136 'collect':38 'connect':246 'content':251 'convers':152 'crawl':235 'crypto':54 'data':49,125 'decim':97 'describ':196 'detail':229 'document':195,230 'embed':137 'endpoint':5,18,28,60,121,165 'estim':147 'exact':181,214 'exchang':142 'export':129 'feed':141 'financ':53,138 'form':210 'found':232 'four':123 'function':182 'gas':146 'gate':3,16,70 'generat':153 'geocod':150 'grant':109 'header':115 'howev':162 'http-post' 'infer':52 'infrastructur':149 'input':198 'insight':130 'key':101 'label':62 'learn':133 'limit':104 'list':118,167 'live':206 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':132 'manifest':227 'maxamountrequir':89 'metric':127 'network':84 'notif':4,17,190 'notification endpoint' 'notification-api' 'notification-rel':189 'openapi':222 'output':200 'page':240 'part':32 'path':186 'pay':8,21,44 'pay-per-cal':43 'pay-per-call API' 'pay-per-request' 'payment':74,76,114 'per':10,23,45,87,160 'platform':36,117 'plugin':226 'post':68 'premium':63 'premium API access' 'price':140,156,237 'prompt':247 'protocol':42 'public':177 'pure':110 'quot':145 'rate':103,143 'relat':191 'report':128 'request':11,24,69,88,161 'resourc':192 'return':241 'rough':119 'schema':201 'scheme':213 'second':219 'sentiment':134 'servic':57 'settl':78 'site':175 'span':48 'spec':223 'specif':59,164 'suggest':187 'summar':135 'timeout':220 'token':144 'unclear':184 'uniform':157 'unit':94 'usdc':13,26,80,215 'usdc-base' 'util':56 'valid':151 'version':211 'via':111 'wallet':245 'wallet-connect':244 'web3':139 'well':209 'well-form':208 'x402':2,15,41,73,113,203 'x402 API' 'x402-gated':1,14 'x402-payment' 'x402-protocol':40","prices":[{"id":"f79441ed-16dd-42e5-aa04-073c3deec668","listingId":"8468ef03-4715-42cf-b3ce-cfbd029d7d4b","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.057Z"}],"sources":[{"listingId":"8468ef03-4715-42cf-b3ce-cfbd029d7d4b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.057Z","lastSeenAt":"2026-04-22T05:32:23.170Z"}],"details":{"listingId":"8468ef03-4715-42cf-b3ce-cfbd029d7d4b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/82 \\\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 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/notifications/82"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is the canonical USDC on Base with 6 decimals.","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notification data via a single paid API call","Agent-driven workflows that need to send or check notifications without API key management","Demonstrating x402 payment-gated endpoint integration on Base"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents that need keyless, on-demand API access settled in USDC on Base","Low-volume, no-commitment API consumption without subscriptions"],"notFor":["High-volume notification pipelines where $0.02/request adds up quickly","Users who need detailed documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.524Z"},"updatedAt":"2026-04-22T05:32:23.170Z"}}