{"id":"e7b90f13-5ad4-498d-a786-493752172211","shortId":"6P4k4P","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/33` 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. The specific function of the `/notifications/33` route is not documented beyond the generic label \"Premium API Access,\" so its exact behavior is unclear — it may deliver a notification payload or trigger a notification action.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) requesting payment in USDC on the Base network. The `maxAmountRequired` is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" payment scheme. The endpoint accepts POST requests and returns `application/json`. No API keys or rate limits are advertised; access is granted purely via x402 payment headers.\n\nThe broader lowpaymentfee.com platform lists roughly 16 endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure), all priced at $0.02 per request. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available for any of these endpoints, including this one. The `/api`, `/pricing`, and `/README` pages all resolve to a minimal \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","notification-api","json-response","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["premium api access","notification endpoint","x402 notification","lowpaymentfee","pay-per-call api","base usdc api","402 payment api"],"warnings":["No documentation exists for this specific endpoint beyond the label 'Premium API Access'","No OpenAPI or schema available for request or response payloads","The /api, /pricing, and /README pages are empty (just 'Connect wallet')","The exact functionality of /notifications/33 is unknown — it could be a stub or placeholder"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/33","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and the specific purpose of '/api/v1/notifications/33' is entirely undocumented. The broader site provides only a listing page with no substantive 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'/api/v1/notifications/33':36 '/notifications/33':69 '/pricing':216 '/readme':218 '/request':16,32 '0.02':15,31,131,191 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':139 '16':175 '20':121 '402':109 '402 payment api' '6':127 'accept':147 'access':80,161 'across':177 'action':97 'addit':230 'address':138 'advertis':160 'ai':182 'ai/ml':57 'analyt':56,181 'api':53,79,154 'application/json':152 'avail':205 'base':7,23,116,123 'base usdc api' 'behavior':84 'beyond':74 'broader':170 'call':11,27 'categori':179 'challeng':107 'collect':44 'connect':225 'content':231 'crypto':60 'data':55,180 'decim':128 'deliv':89 'detail':198 'document':73,199 'endpoint':5,21,34,99,146,176,210 'equal':130 'exact':83,142 'exampl':201 'financ':59,185 'four':178 'function':66 'gate':3,19 'generic':76 'grant':163 'header':168 'howev':194 'http':108 'includ':211 'infer':58 'infrastructur':187 'json-response' 'key':155 'label':77 'learn':184 'limit':158 'list':173 'live':101 'lowpaymentfee' 'lowpaymentfee.com':41,171 'machin':183 'maxamountrequir':119 'may':88 'minim':224 'network':117 'no-api-key' 'notif':4,20,91,96 'notification endpoint' 'notification-api' 'one':213 'openapi':196 'page':219 'part':38 'pay':9,25,50 'pay-per-cal':8,24 'pay-per-call api' 'pay-per-request':49 'payload':92,203 'payment':111,134,143,167 'per':10,26,51,132,192 'platform':42,172 'post':148 'premium':78 'premium api access' 'price':189 'prompt':227 'protocol':48 'pure':164 'rate':157 'request':52,110,133,149,193 'request/response':202 'resolv':221 'return':103,151 'rough':174 'rout':70 'schema':197 'scheme':144 'sent':136 'servic':63 'span':54 'specif':65 'trigger':94 'unclear':86 'unit':124 'usdc':13,29,113,126 'usdc-base' 'use':140 'util':62 'valid':105 'via':165 'wallet':226 'web3':186 'x402':2,18,47,106,166 'x402 notification' 'x402-gated':1,17 'x402-payment' 'x402-protocol':46","prices":[{"id":"2322c3e4-fc10-489a-a5ac-f17ae773cbbe","listingId":"e7b90f13-5ad4-498d-a786-493752172211","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.019Z"}],"sources":[{"listingId":"e7b90f13-5ad4-498d-a786-493752172211","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.019Z","lastSeenAt":"2026-04-22T02:32:10.541Z"}],"details":{"listingId":"e7b90f13-5ad4-498d-a786-493752172211","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/33 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/33"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/33"},{"claim":"The platform lists ~16 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching or triggering a notification via a single paid API call","Integrating pay-per-use notification delivery into an agent workflow","Testing x402 payment flows against a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing simple pay-per-call endpoints without API key management","Low-cost micro-transaction API access on Base"],"notFor":["Production notification systems requiring documented schemas and SLAs","Use cases needing bulk or subscription-based notification delivery","Anyone requiring detailed API documentation before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.821Z"},"updatedAt":"2026-04-22T02:32:10.541Z"}}