{"id":"2619d2b0-8b22-4971-b9e6-9cddd5ac4575","shortId":"CrQbfD","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/13` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data analytics, AI/ML inference, finance, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific endpoint listed here is described as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals).\n\nThe broader platform advertises categories including Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific functionality of the `/api/v1/notifications/13` endpoint is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is live and returns a valid x402 challenge via POST, accepting USDC payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["premium api","notification api","x402 api","pay-per-call api","lowpaymentfee","base usdc api","micropayment api"],"warnings":["No documentation exists for what /api/v1/notifications/13 actually does — 'Premium API Access' is a generic label","No OpenAPI schema, request format, or response format is available","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content","This endpoint does not appear in the site's own catalog of available APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/13","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/13","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 the specific functionality of /api/v1/notifications/13 is entirely undocumented. There is no OpenAPI schema, no request/response examples, and the description is a generic 'Premium API Access' label. The crawled pages provide only a high-level catalog listing with no detail on this particular 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'/request':143 '0.02':11,26,87,142 '000':91 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':208 '20':90 '6':97 'accept':203 'access':84,172 'address':207 'advertis':102 'ai':112 'ai/ml':54 'analysi':116 'analyt':53,106 'api':50,83,147,171 'avail':186 'base':8,23,72,92,210 'base usdc api' 'base-network' 'beyond':167 'broader':100 'call':4,19,89 'categori':103 'challeng':200 'classif':119 'commit':155 'convers':135 'cost':86 'crawl':189 'data':52,105,109 'decim':98 'describ':80 'detail':184 'document':166,185 'embed':120 'endpoint':6,21,32,61,76,138,163,192 'estim':130 'exampl':181 'exchang':125 'export':110 'feed':124 'financ':56,121 'function':159 'gas':129 'generat':136 'generic':169 'geocod':133 'includ':104 'infer':55 'infrastructur':58,132 'insight':111 'key':148 'label':173 'learn':114 'limit':151 'list':77 'live':194 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':113 'metric':107 'micropayment api' 'minimum':154 'network':73 'no-api-key' 'notif':5,20 'notification api' 'notifications' 'offer':42 'openapi':177 'page':190 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call api' 'pay-per-request':46 'payment':65,205 'per':3,12,18,27,48,88 'platform':40,101 'post':202 'premium':82,170 'premium api' 'price':123,144 'protocol':66 'quot':128 'rate':126,150 'report':108 'request':13,28,49 'request/response':180 'requir':156 'return':196 'schema':178 'sentiment':115 'settl':67 'share':139 'span':51 'specif':75,158 'suit':44 'summar':118 'text':117 'token':127 'unit':93 'usdc':15,30,69,95,204 'usdc-settlement' 'use':62 'util':59 'valid':134,198 'via':9,24,201 'web3':122 'x402':10,25,64,199 'x402 api' 'x402-payment'","prices":[{"id":"b0c73c07-2682-4dee-bd9f-550fa03307f6","listingId":"2619d2b0-8b22-4971-b9e6-9cddd5ac4575","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.112Z"}],"sources":[{"listingId":"2619d2b0-8b22-4971-b9e6-9cddd5ac4575","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.112Z","lastSeenAt":"2026-04-22T04:02:46.575Z"}],"details":{"listingId":"2619d2b0-8b22-4971-b9e6-9cddd5ac4575","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/13 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/13"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/13"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Integrating low-cost notification functionality into agent workflows using x402 payments","Accessing premium notification data with per-request USDC micropayments on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing notification endpoints without subscription overhead"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Anyone unable to pay in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.444Z"},"updatedAt":"2026-04-22T04:02:46.575Z"}}