{"id":"60a8f019-4e57-4e54-bd00-2a5d3890a9e1","shortId":"9EpKfR","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/27` 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 payment protocol, settling in USDC on the Base network at $0.02 per call. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint probed (`/api/v1/notifications/27`) is listed under the title \"Premium API Access\" but its exact functionality is unclear from the available documentation. The provider's landing page does not list this particular path among its advertised APIs, and no OpenAPI schema, request/response examples, or detailed docs were found. The x402 challenge confirms the endpoint is live, accepts POST requests, and charges a maximum of 20,000 base units of USDC (i.e., $0.02) per call on Base.\n\nBecause the crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content, the actual behavior of this notifications endpoint remains undocumented. Prospective callers should be aware that the endpoint's input format and response structure are not publicly specified.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","lowpaymentfee","x402 notification","pay-per-call notification","USDC API","Base network API"],"warnings":["Endpoint /api/v1/notifications/27 is not listed among the provider's advertised APIs on the landing page — its purpose is unclear.","No OpenAPI schema, request body format, or response examples are available.","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content.","The description 'Premium API Access' is generic and does not explain what the endpoint does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/27","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/27","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 confirms pricing and network, but the endpoint's actual functionality, input schema, and response format are entirely undocumented. The /api/v1/notifications/27 path does not appear in the provider's own advertised API list, and all doc pages returned only wallet-connect 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'/api/v1/notifications/27':34,101 '/pricing':178 '/readme':180 '0.02':11,26,74,169 '000':163 '20':162 'Base network API' 'USDC API' 'accept':154 'access':109 'actual':194 'advertis':133 'ai/ml':54 'among':131 'analyt':53 'api':50,78,108,134 'attach':89 'avail':118 'awar':206 'base':8,23,71,164,173 'base-network' 'behavior':195 'call':4,19,76,171 'caller':87,203 'challeng':148 'charg':158 'collect':44 'commit':84 'confirm':149 'connect':186 'content':192 'crawl':176 'data':52 'detail':142 'doc':143 'document':119 'endpoint':6,21,32,60,99,151,199,209 'exact':112 'exampl':140 'finance/web3':55 'format':212 'found':145 'function':113 'header':93 'i.e':168 'infrastructur':57 'input':211 'key':79 'land':123 'limit':81 'list':103,127 'live':153 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':160 'network':72 'notif':5,20,198 'notification API' 'notifications' 'offer':42 'openapi':137 'page':124,181 'part':36 'particular':129 'path':130 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call notification' 'pay-per-request':46 'payment':64,92 'per':3,12,18,27,48,75,170 'platform':40 'post':155 'premium':107 'premium API access' 'probe':100 'prompt':188 'prospect':202 'protocol':65 'provid':121 'public':218 'rate':80 'remain':200 'request':13,28,49,96,156 'request/response':139 'requir':86 'respons':214 'return':183 'schema':138 'settl':66 'simpli':88 'span':51 'specif':98 'specifi':219 'structur':215 'substant':191 'titl':106 'unclear':115 'undocu':201 'unit':165 'upfront':83 'usdc':15,30,68,167 'usdc-settlement' 'use':61 'util':58 'via':9,24 'wallet':187 'x402':10,25,63,91,147 'x402 notification' 'x402-payment'","prices":[{"id":"6412a65c-5380-499d-aecc-a19103ceaaf7","listingId":"60a8f019-4e57-4e54-bd00-2a5d3890a9e1","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/27","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.912Z"}],"sources":[{"listingId":"60a8f019-4e57-4e54-bd00-2a5d3890a9e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/27","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.912Z","lastSeenAt":"2026-04-22T02:32:10.389Z"}],"details":{"listingId":"60a8f019-4e57-4e54-bd00-2a5d3890a9e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/27 \\\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 x402 challenge returns 402 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/27"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/27"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/notifications/27 path is not listed among the provider's advertised API endpoints","source_url":"https://lowpaymentfee.com"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Agent-driven workflows that need to trigger notifications with instant crypto-settled payments","Integrating low-cost notification delivery into automated pipelines on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Use cases requiring no rate limits or subscription commitments"],"notFor":["Users who need detailed API documentation and guaranteed SLAs before integrating","High-volume notification workloads where per-call pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.939Z"},"updatedAt":"2026-04-22T02:32:10.389Z"}}