{"id":"3f6bc008-6ace-47c2-8e54-24cbba15d1da","shortId":"AX9zyH","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 lowpaymentfee.com provides a \"Premium API Access\" notification resource at `/api/v1/notifications/63`. It is part of a broader platform offering dozens of pay-per-call API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network via the x402 protocol.\n\nThe specific `/api/v1/notifications/63` endpoint accepts POST requests and returns `application/json`. Payment is handled inline: callers attach an `X-PAYMENT` header containing a signed x402 payment for up to 20,000 base units of USDC (i.e., $0.02) to the payee address `0x1A2B…85F3`. No API keys, subscriptions, or rate limits are advertised — access is purely gated by per-request micropayment.\n\nDocumentation beyond the landing page is sparse. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema, and no example payloads available. The exact functionality behind the \"notifications/63\" resource is unclear — it could be a notification delivery, retrieval, or status endpoint. Agents should treat this as a low-cost experimental endpoint and verify behavior with a test call.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","notifications-api","pay-per-request","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["notification endpoint","x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","The exact purpose of /api/v1/notifications/63 is not documented; 'Premium API Access' is a generic label used across the platform.","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content.","Platform lists many endpoint categories but none have detailed docs; treat as experimental."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/63","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/63","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 OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the purpose of the specific /notifications/63 resource is unexplained. Effectively a stub 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'/api/v1/notifications/63':45,93 '/pricing':162 '/readme':164 '/request':16,32 '0.02':15,31,76,127 '000':121 '0x1a2b':132 '20':120 '85f3':133 'Base network API' 'USDC pay-per-call' 'accept':95 'access':41,143 'addit':175 'address':131 'advertis':142 'agent':210 'ai':65 'analyt':64 'api':40,60,135 'application/json':100 'attach':106 'avail':190 'base':8,24,85,122 'base-network' 'behavior':223 'behind':194 'beyond':153 'broader':51 'call':4,20,59,227 'caller':105 'connect':170 'contain':112 'cost':218 'could':201 'crawl':160 'data':63 'deliveri':205 'detail':177 'document':152 'dozen':54 'endpoint':6,22,34,61,94,209,220 'exact':192 'exampl':188 'experiment':219 'financ':68 'function':193 'gate':146 'handl':103 'header':111 'i.e':126 'infrastructur':71 'inlin':104 'key':136 'land':155 'learn':67 'limit':140 'low':217 'low-cost':216 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':66 'micropay':151 'micropayment API' 'network':86 'no-api-key' 'notif':5,21,42,204 'notification endpoint' 'notifications-api' 'notifications/63':196 'offer':53 'openapi':181 'page':156,165 'part':48 'pay':2,18,57 'pay-per-cal':1,17,56 'pay-per-request' 'paye':130 'payload':189 'payment':101,110,116 'per':3,19,58,77,149 'per-request':148 'platform':52 'post':96 'premium':39 'premium API access' 'price':74 'prompt':172 'protocol':90 'provid':37 'pure':145 'rate':139 'request':78,97,150 'request/response':184 'resourc':43,197 'retriev':206 'return':99,167 'schema':185 'settl':11,27,80 'sign':114 'span':62 'spars':158 'spec':182 'specif':92 'status':208 'subscript':137 'technic':176 'test':226 'treat':212 'unclear':199 'unit':123 'usdc':13,29,82,125 'usdc-micropayment' 'util':72 'verifi':222 'via':9,25,87 'wallet':171 'web3':69 'x':109 'x-payment':108 'x402':10,26,89,115 'x402 API' 'x402-payment'","prices":[{"id":"e0ff777f-c340-4791-93fc-662a36f78e9f","listingId":"3f6bc008-6ace-47c2-8e54-24cbba15d1da","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.215Z"}],"sources":[{"listingId":"3f6bc008-6ace-47c2-8e54-24cbba15d1da","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.215Z","lastSeenAt":"2026-04-22T02:32:10.827Z"}],"details":{"listingId":"3f6bc008-6ace-47c2-8e54-24cbba15d1da","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/63 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-signed-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/63"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/63"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Agent-driven workflows that need to trigger or check notification status with inline USDC payment","Testing x402 micropayment integrations on the Base network"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need keyless, per-request access to notification services","Low-volume use cases where $0.02/call is acceptable"],"notFor":["High-volume notification pipelines where per-call payment overhead is impractical","Users who need detailed documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.461Z"},"updatedAt":"2026-04-22T02:32:10.827Z"}}