{"id":"ab0000af-df90-41bb-ba96-8f78adbe21ab","shortId":"4QacqU","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/6` 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 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 `/api/v1/notifications/6` endpoint is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented on the provider's landing page, which lists other endpoint categories (analytics, AI, finance, utilities) but does not mention a notifications resource. The x402 challenge confirms the endpoint is live, accepts POST requests, and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base.\n\nBecause the endpoint's response schema and detailed documentation are not available, the actual data returned by this notifications endpoint is unknown. Callers should test with a paid request to discover the response format. The broader platform advertises a uniform $0.02 pricing model across all its endpoints.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications","post-method"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notifications","pay-per-call API","lowpaymentfee","USDC API","Base network API","micropayment API"],"warnings":["The /api/v1/notifications/6 endpoint is not listed on the provider's landing page; its purpose and response format are undocumented.","No OpenAPI spec, response schema, or example responses are available.","The provider's /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/6","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation for the /api/v1/notifications/6 resource specifically — it does not appear on the provider's landing page, no OpenAPI schema exists, and no response examples are available. The endpoint's actual functionality is 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'0.02':11,26,75,163,215 '000':157 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':172 '20':156 'Base network API' 'USDC API' 'accept':148 'access':106 'across':218 'actual':188 'address':171 'advertis':212 'ai':130 'ai/ml':54 'analyt':53,129 'api':50,79,105 'attach':90 'avail':186 'base':8,23,72,158,174 'base-network' 'broader':210 'call':4,19,77,165 'caller':88,197 'categori':128 'challeng':110,142 'commit':85 'confirm':143 'data':52,189 'detail':182 'discov':205 'document':117,183 'endpoint':6,21,32,61,101,127,145,177,194,221 'exact':113 'financ':131 'finance/web3':56 'format':208 'function':114 'header':94 'i.e':162 'infer':55 'infrastructur':58 'key':80 'label':103 'land':122 'limit':82 'list':125 'live':147 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':154 'mention':136 'micropayment API' 'model':217 'network':73 'notif':5,20,138,193 'notification API' 'notifications' 'offer':42 'page':123 'paid':202 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':65,93,167 'per':3,12,18,27,48,76,164 'platform':40,211 'post':149 'post-method' 'premium':104 'premium API access' 'price':216 'protocol':66 'provid':120 'rate':81 'request':13,28,49,97,150,203 'requir':87,152 'resourc':139 'respons':179,207 'return':190 'schema':180 'sent':169 'settl':67 'simpli':89 'span':51 'specif':99 'suit':44 'test':199 'uniform':214 'unit':159 'unknown':196 'upfront':84 'usdc':15,30,69,161 'usdc-settlement' 'use':62 'util':59,132 'via':9,24 'x402':10,25,64,92,109,141 'x402 notifications' 'x402-payment'","prices":[{"id":"38e729b9-ce74-4e8f-ac07-a2e80343bc79","listingId":"ab0000af-df90-41bb-ba96-8f78adbe21ab","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.227Z"}],"sources":[{"listingId":"ab0000af-df90-41bb-ba96-8f78adbe21ab","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.227Z","lastSeenAt":"2026-04-22T02:32:10.839Z"}],"details":{"listingId":"ab0000af-df90-41bb-ba96-8f78adbe21ab","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/6 \\\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 x402 challenge confirms the endpoint is live, accepts POST, and requires maxAmountRequired of 20000 base units of USDC on Base.","source_url":"https://lowpaymentfee.com/api/v1/notifications/6"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network with 6 decimals means 20000 base units = $0.02.","source_url":"https://lowpaymentfee.com/api/v1/notifications/6"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The landing page lists endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories but does not list a notifications endpoint.","source_url":"https://lowpaymentfee.com"}],"useCases":["Triggering or retrieving notifications via a single paid API call","Integrating pay-per-use notification services into agent workflows","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents needing simple pay-per-call endpoints without API key management","Low-volume callers who want no subscription or rate-limit overhead"],"notFor":["High-volume notification pipelines where per-call costs add up quickly","Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.46Z"},"updatedAt":"2026-04-22T02:32:10.839Z"}}