{"id":"d2252c05-f7db-414b-8e76-ab488dc2f735","shortId":"SKBBpn","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call notification endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/notifications/26` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 protocol on the Base network, accepting USDC payments with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint listed here is described as \"Premium API Access\" and is priced at 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to a wallet on Base. The endpoint accepts HTTP POST requests and returns `application/json` responses. The x402 challenge was successfully captured, confirming the endpoint is live.\n\nNote that the endpoint path (`/notifications/26`) suggests a notification-related resource, but no further documentation is available describing the request body schema, expected parameters, or response format. The broader platform advertises categories including analytics, AI, finance, and infrastructure utilities — all at the same $0.02 price point — but specifics for this particular notification endpoint are undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications","json-response","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["premium API","notification API","x402 endpoint","pay-per-call API","lowpaymentfee","USDC API","Base network API","micropayment API"],"warnings":["No documentation available for the /api/v1/notifications/26 endpoint — request body, parameters, and response format are unknown.","The broader site's /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content.","No OpenAPI spec, ai-plugin manifest, or agents.txt found.","Endpoint purpose (notifications) is inferred solely from the URL path; actual functionality is unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/26","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation for this specific endpoint — no request/response schema, no description of what the notification resource does, and no examples. The listing is effectively a stub with confirmed 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'/notifications/26':157 '/request':16,32 '0.02':15,31,108,196 '000':103 '20':102 '6':115 'Base network API' 'USDC API' 'accept':73,133 'access':97 'advertis':183 'ai':187 'ai/ml':56 'analyt':55,186 'api':52,78,96 'application/json':139 'avail':169 'base':8,24,71,104,130 'base-network' 'bodi':173 'broader':181 'call':4,20 'captur':146 'categori':184 'challeng':143 'collect':46 'confirm':147 'crypto':59 'data':54 'decim':116 'describ':93,170 'document':167 'endpoint':6,22,34,64,89,132,149,155,205 'exact':123 'expect':175 'financ':58,188 'format':179 'http':134 'includ':185 'infer':57 'infrastructur':190 'json-response' 'key':79 'limit':82 'list':90 'live':151 'lowpaymentfee' 'lowpaymentfee.com':41 'made':119 'micropayment API' 'network':72 'no-api-key' 'note':152 'notif':5,21,161,204 'notification API' 'notification-rel':160 'notifications' 'offer':44 'paramet':176 'part':38 'particular':203 'path':156 'pay':2,18,49 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':48 'payment':75,117 'per':3,19,50,110 'platform':42,182 'point':198 'post':135 'premium':95 'premium API' 'price':100,197 'protocol':68 'rate':81 'relat':162 'request':51,111,136,172 'requir':86 'resourc':163 'respons':140,178 'return':138 'schema':174 'scheme':124 'servic':62 'settl':11,27,125 'sinc':112 'span':53 'specif':88,200 'subscript':85 'success':145 'suggest':158 'undocu':207 'unit':105 'usd':109 'usdc':13,29,74,107,113 'usdc-settlement' 'use':65,114 'util':61,191 'via':9,25,120 'wallet':128 'x402':10,26,67,122,142 'x402 endpoint' 'x402-payment'","prices":[{"id":"409acea5-3454-43f2-8787-8df1a7b86358","listingId":"d2252c05-f7db-414b-8e76-ab488dc2f735","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.054Z"}],"sources":[{"listingId":"d2252c05-f7db-414b-8e76-ab488dc2f735","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.054Z","lastSeenAt":"2026-04-22T02:32:10.606Z"}],"details":{"listingId":"d2252c05-f7db-414b-8e76-ab488dc2f735","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/26 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network.","source_url":"https://lowpaymentfee.com/api/v1/notifications/26"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is the canonical USDC contract on Base.","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 or API key management"],"bestFor":["Agents needing one-off notification API calls without signup","Developers wanting frictionless pay-per-request access on Base","Crypto-native applications that can settle in USDC via x402"],"notFor":["High-volume notification use cases where per-call pricing adds up quickly","Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.707Z"},"updatedAt":"2026-04-22T02:32:10.606Z"}}