{"id":"39b17869-9710-43c4-8d8c-2193ab5990aa","shortId":"UAraRD","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/72`. It is part of a broader platform offering dozens of pay-per-call APIs spanning data & analytics, AI/ML inference, finance & Web3 data, 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/72` 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 `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. No API keys, accounts, or rate limits are advertised — access is gated purely by micropayment.\n\nBecause the endpoint path includes a numeric ID (`/72`), it likely addresses a specific notification resource, but no further documentation or schema details are available beyond the x402 challenge and the landing page. The platform's other listed endpoints (sentiment analysis, text summarization, price feeds, geocoding, etc.) follow the same pricing and payment model. Without deeper docs or an OpenAPI spec, the exact request body format and response shape for this particular endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","notification-api","json-response","no-api-key","no-rate-limit"],"categories":["notifications","infrastructure"],"synonyms":["notification endpoint","premium api","x402 micropayment api","lowpaymentfee","pay-per-request api","base usdc api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — request body format and response shape are unknown","The specific purpose of /api/v1/notifications/72 is undocumented; the numeric ID suggests a resource-specific endpoint but details are absent","Landing page lists many endpoints but /api and /pricing pages only show 'Connect wallet' with no further content","No SLA, rate-limit, or uptime guarantees documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/72","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/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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 listing, and the purpose of the /notifications/72 resource is unexplained. Effectively a stub 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'/api/v1/notifications/72':45,92 '/request':16,32 '0.02':15,31,75,126 '000':120 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '20':119 '402 payment api' 'accept':94 'access':41,141 'account':135 'address':130,158 'advertis':140 'ai/ml':64 'analysi':187 'analyt':63 'api':40,60,133 'application/json':99 'attach':105 'avail':171 'base':8,24,84,121 'base usdc api' 'beyond':172 'bodi':211 'broader':51 'call':4,20,59 'caller':104 'challeng':175 'contain':111 'data':62,68 'deeper':202 'detail':169 'doc':203 'document':166 'dozen':54 'endpoint':6,22,34,93,149,185,219 'etc':193 'exact':209 'feed':191 'financ':66 'follow':194 'format':212 'gate':143 'geocod':192 'handl':102 'header':110 'i.e':125 'id':154 'includ':151 'infer':65 'infrastructur':70 'inlin':103 'json-response' 'key':134 'land':178 'like':157 'limit':138 'list':184 'lowpaymentfee' 'lowpaymentfee.com':36 'micropay':146 'model':200 'network':85 'no-api-key' 'no-rate-limit' 'notif':5,21,42,161 'notification endpoint' 'notification-api' 'numer':153 'offer':53 'openapi':206 'page':179 'part':48 'particular':218 'path':150 'pay':2,18,57 'pay-per-cal':1,17,56 'pay-per-call' 'pay-per-request api' 'paye':129 'payment':100,109,115,199 'per':3,19,58,76 'platform':52,181 'post':95 'premium':39 'premium api' 'price':73,190,197 'protocol':89 'provid':37 'pure':144 'rate':137 'remain':220 'request':77,96,210 'resourc':43,162 'respons':214 'return':98 'schema':168 'sentiment':186 'settl':11,27,79 'shape':215 'sign':113 'span':61 'spec':207 'specif':91,160 'summar':189 'text':188 'unit':122 'unknown':221 'usdc':13,29,81,124 'usdc-base' 'util':71 'via':9,25,86 'web3':67 'without':201 'x':108 'x-payment':107 'x402':10,26,88,114,174 'x402 micropayment api' 'x402-payment'","prices":[{"id":"473b6abd-e278-42f5-a239-eaf92acb56e4","listingId":"39b17869-9710-43c4-8d8c-2193ab5990aa","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/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.149Z"}],"sources":[{"listingId":"39b17869-9710-43c4-8d8c-2193ab5990aa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.149Z","lastSeenAt":"2026-04-22T02:32:10.733Z"}],"details":{"listingId":"39b17869-9710-43c4-8d8c-2193ab5990aa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/72 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/72"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the 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"}],"useCases":["Triggering or retrieving a specific notification via a single paid API call","Integrating pay-per-use notification delivery into agent workflows","Demonstrating x402 micropayment flows on the Base network"],"bestFor":["Agents that need simple, keyless API access gated by micropayment","Developers experimenting with x402 payment protocol on Base","Low-volume, on-demand notification retrieval without subscription commitments"],"notFor":["High-volume notification streaming where per-call fees add up quickly","Use cases requiring detailed API documentation or guaranteed SLAs","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.581Z"},"updatedAt":"2026-04-22T02:32:10.733Z"}}