{"id":"429f47c4-3c7b-403b-a33a-c0511b63716a","shortId":"skyvjx","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/31` is part of the lowpaymentfee.com platform, which offers a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific endpoint probed here is labeled \"Premium API Access\" and accepts POST requests.\n\nThe x402 challenge confirms the endpoint is live, requesting a maximum of 20,000 base units of USDC (asset `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). Since USDC uses 6 decimals, this translates to $0.02 per request — consistent with the site-wide pricing of $0.02/request advertised on the landing page. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a 300-second timeout.\n\nDocumentation is minimal: the landing page lists available API paths and pricing, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. The exact functionality of the `/notifications/31` endpoint is unclear — the description is simply \"Premium API Access\" with no further detail on what notification data it returns or what input it expects. Because of this opacity, agents should treat this as a low-documentation endpoint where the actual behavior must be discovered empirically.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications-api","post-method"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notification","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact purpose and expected input/output of /api/v1/notifications/31 is undocumented","All non-root pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no useful content","No request body schema or response schema could be determined"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/31","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/31","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 with clear pricing, but there is no OpenAPI spec, no request/response schema, no usage examples, and the actual functionality of '/notifications/31' is undocumented. The listing is effectively a stub with confirmed liveness and 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'/api/v1/notifications/31':36 '/notifications/31':202 '/pricing':182 '/readme':184 '/request':16,32,133 '0.02':15,31,121,132 '000':104 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20':103 '300':151 '6':116 'Base network API' 'USDC micropayment API' 'accept':88 'access':86,212 'actual':244 'addit':195 'address':147 'advertis':134 'agent':232 'ai/ml':57 'analyt':56 'api':53,85,162,211 'asset':109 'avail':161 'base':8,24,75,105,112 'base-network' 'behavior':245 'broad':46 'call':4,20 'catalog':47 'challeng':93 'confirm':94 'connect':190 'consist':124 'content':196 'data':55,220 'decim':117 'descript':207 'detail':216 'discov':248 'document':154,175,240 'empir':249 'endpoint':6,22,34,64,79,96,203,241 'exact':144,198 'exampl':179 'expect':227 'finance/web3':59 'function':199 'infer':58 'infrastructur':61 'input':225 'label':83 'land':137,158 'list':160 'live':98 'low':239 'low-document':238 'lowpaymentfee' 'lowpaymentfee.com':41 'made':141 'maximum':101 'minim':156 'must':246 'network':76 'notif':5,21,219 'notification API' 'notifications-api' 'offer':44 'opac':231 'openapi':170 'page':138,159,185 'part':38 'path':163 'pay':2,18,50 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':49 'payment':68,139 'per':3,19,51,122 'platform':42 'post':89 'post-method' 'premium':84,210 'premium API access' 'price':130,165 'probe':80 'prompt':192 'protocol':69 'request':52,90,99,123 'request/response':173 'resolv':187 'return':222 'schema':174 'scheme':145 'second':152 'settl':11,27,70 'simpli':209 'sinc':113 'site':128 'site-wid':127 'span':54 'spec':171 'specif':78 'timeout':153 'translat':119 'treat':234 'unclear':205 'unit':106 'usag':178 'usdc':13,29,72,108,114 'usdc-settlement' 'use':65,115 'util':62 'via':9,25,142 'wallet':191 'wide':129 'x402':10,26,67,92 'x402 notification' 'x402-payment'","prices":[{"id":"7fd9e88d-7eb9-41bd-b4fe-09a99e22a8d9","listingId":"429f47c4-3c7b-403b-a33a-c0511b63716a","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:33.369Z"}],"sources":[{"listingId":"429f47c4-3c7b-403b-a33a-c0511b63716a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:33.369Z","lastSeenAt":"2026-04-22T04:02:48.023Z"}],"details":{"listingId":"429f47c4-3c7b-403b-a33a-c0511b63716a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/31 \\\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 site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/notifications/31"},{"claim":"The endpoint is described as 'Premium API Access' in the x402 challenge","source_url":"https://lowpaymentfee.com/api/v1/notifications/31"}],"useCases":["Retrieving notification data via a single paid POST request","Programmatic access to notification resources without API keys or subscriptions","Agent-driven workflows that need on-demand notification lookups with crypto micropayments"],"bestFor":["Developers wanting keyless, pay-per-use API access settled in USDC on Base","AI agents that can handle x402 payment challenges natively","Users who prefer no-commitment, no-rate-limit API consumption"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:44.927Z"},"updatedAt":"2026-04-22T04:02:48.023Z"}}