{"id":"c146c0a2-264a-44ce-a36a-21ef06ac747d","shortId":"C6GqBt","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/5` is part of the lowpaymentfee.com platform, which offers a suite of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 protocol, requiring a USDC payment on the Base network for each call. The specific endpoint listed here is described as \"Premium API Access\" and costs $0.02 per request (20,000 base units of USDC with 6 decimals).\n\nThe platform advertises a simple pricing model: $0.02 per request across all endpoints, with no API keys, no rate limits, no minimums, and instant access. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge was successfully captured with version 1 of the protocol, confirming the endpoint is live.\n\nHowever, the specific functionality of the `/api/v1/notifications/5` endpoint is unclear. The provider's landing page lists many API categories (analytics, AI, finance, infrastructure) but does not mention a notifications endpoint. No OpenAPI schema, request/response examples, or detailed documentation were found. The `/api`, `/pricing`, and `/README` pages all returned only a \"Connect wallet\" prompt with no additional content. As a result, the actual behavior and response format of this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications"],"categories":["infrastructure"],"synonyms":["notification API","premium API access","x402 notification","pay-per-call API","lowpaymentfee","USDC API","Base network API"],"warnings":["The /api/v1/notifications/5 endpoint is not listed on the provider's landing page among available APIs — its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","The /api, /pricing, and /README pages returned no useful content beyond 'Connect wallet'.","The endpoint's purpose ('Premium API Access') is a generic label that does not describe what the endpoint actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/5","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of the /notifications/5 path is undocumented. The landing page does not list a notifications category at 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'/api/v1/notifications/5':36,169 '/pricing':205 '/readme':207 '/request':16,32 '0.02':15,31,95,114 '000':99 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':140 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':143 '1':154 '20':98 '6':105 'Base network API' 'USDC API' 'access':92,131 'across':117 'actual':224 'addit':218 'address':139 'advertis':109 'ai':183 'ai/ml':56 'analyt':55,182 'api':52,91,122,180 'base':8,24,77,100,145 'base-network' 'behavior':225 'call':4,20,81 'captur':151 'categori':181 'chain':137 'challeng':148 'confirm':158 'connect':213 'content':219 'cost':94 'data':54 'decim':106 'describ':88 'detail':199 'document':200 'endpoint':6,22,34,64,84,119,160,170,192,231 'exampl':197 'financ':58,184 'format':228 'found':202 'function':166 'gate':66 'howev':163 'infer':57 'infrastructur':61,185 'instant':130 'key':123 'land':176 'limit':126 'list':85,178 'live':162 'lowpaymentfee' 'lowpaymentfee.com':41 'mani':179 'mention':189 'minimum':128 'model':113 'network':78 'notif':5,21,191 'notification API' 'notifications' 'offer':44 'on-chain':135 'openapi':194 'page':177,208 'part':38 'pay':2,18,49 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':48 'payment':74,132 'per':3,19,50,96,115 'platform':42,108 'premium':90 'premium API access' 'price':112 'prompt':215 'protocol':70,157 'provid':174 'rate':125 'remain':232 'request':51,97,116 'request/response':196 'requir':71 'respons':227 'result':222 'return':210 'schema':195 'settl':11,27,134 'simpl':111 'span':53 'specif':83,165 'success':150 'suit':46 'unclear':172 'unit':101 'unknown':233 'usdc':13,29,73,103,142 'usdc-settlement' 'use':141 'util':62 'version':153 'via':9,25,67 'wallet':214 'web3':59 'x402':10,26,69,147 'x402 notification' 'x402-payment'","prices":[{"id":"9f25f80b-d945-4518-9e1a-4d6a971b6394","listingId":"c146c0a2-264a-44ce-a36a-21ef06ac747d","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.942Z"}],"sources":[{"listingId":"c146c0a2-264a-44ce-a36a-21ef06ac747d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.942Z","lastSeenAt":"2026-04-22T05:32:23.026Z"}],"details":{"listingId":"c146c0a2-264a-44ce-a36a-21ef06ac747d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/5 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\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 requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/5"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/5"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists APIs in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure — but no notifications category","source_url":"https://lowpaymentfee.com"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Integrating low-cost notification services into agent workflows settled on Base","Testing x402 protocol payment flows with a live endpoint"],"bestFor":["Developers exploring x402 pay-per-request patterns","Agent-based systems needing keyless API access with on-chain payment","Low-volume notification use cases where per-call pricing is preferred"],"notFor":["High-volume notification workloads where per-call costs add up quickly","Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.656Z"},"updatedAt":"2026-04-22T05:32:23.026Z"}}