{"id":"c2031484-2496-4269-9a37-4e21e2443544","shortId":"KjRHfm","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 lowpaymentfee.com provides a \"Premium API Access\" notification resource at `/api/v1/notifications/25`. It is part of a broader platform offering dozens of pay-per-call APIs spanning data & analytics, AI/ML inference, 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/25` endpoint accepts POST requests and returns 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, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet. No API keys, rate limits, or upfront commitments are required — access is instant once payment is included.\n\nDocumentation beyond the landing page is sparse. The `/api`, `/pricing`, and `/README` routes all resolve to a wallet-connect stub with no additional detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads describing what the notifications endpoint actually returns or what POST body it expects. The endpoint is confirmed live (returns a proper 402 challenge), but the actual functionality behind the paywall is unknown from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","notifications","json-response","no-api-key"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notification","pay-per-request API","lowpaymentfee","Base USDC API","micropayment API"],"warnings":["No documentation exists for the /api/v1/notifications/25 endpoint — its purpose and expected request/response format are unknown.","No OpenAPI spec, no README content, and /api, /pricing, /README pages are all empty wallet-connect stubs.","The broader platform lists many endpoints but none have documented schemas or examples.","Actual notification functionality is unverifiable without paying through the paywall."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/25","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples of what the notifications endpoint actually does. The actual functionality behind the paywall is entirely 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'/api/v1/notifications/25':43,88 '/pricing':164 '/readme':166 '0.02':11,26,71,122 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '20':115 '402':214 '6':126 'Base USDC API' 'accept':90 'access':39,148 'actual':198,218 'addit':178 'address':133 'ai/ml':62 'analyt':61 'api':38,58,139 'attach':101 'avail':226 'base':8,23,80,117,136 'base-network' 'behind':220 'beyond':156 'bodi':203 'broader':49 'call':4,19,57 'caller':100 'challeng':215 'commit':145 'confirm':209 'connect':174 'contain':107 'data':60 'decim':127 'describ':193 'detail':179 'document':155,188 'dozen':52 'endpoint':6,21,32,89,197,207 'exampl':191 'expect':205 'finance/web3':64 'function':219 'handl':98 'header':106 'i.e':121 'includ':154 'infer':63 'infrastructur':66 'inlin':99 'instant':150 'json':95 'json-response' 'key':140 'land':158 'limit':142 'live':210 'lowpaymentfee' 'lowpaymentfee.com':34 'mainnet':137 'materi':227 'micropayment API' 'network':81 'no-api-key' 'notif':5,20,40,196 'notification API' 'notifications' 'offer':51 'openapi':183 'page':159 'part':46 'pay':2,17,55 'pay-per-cal':1,16,54 'pay-per-call' 'pay-per-request API' 'payload':192 'payment':96,105,111,129,152 'paywal':222 'per':3,12,18,27,56,72 'platform':50 'post':91,202 'premium':37 'premium API access' 'price':69 'proper':213 'protocol':85 'provid':35 'rate':141 'request':13,28,73,92 'request/response':186 'requir':147 'resolv':169 'resourc':41 'return':94,199,211 'rout':167 'schema':187 'sent':131 'settl':75 'sign':109 'sinc':123 'span':59 'spars':161 'spec':184 'specif':87 'stub':175 'unit':118 'unknown':224 'upfront':144 'usdc':15,30,77,120,124 'usdc-settlement' 'use':125 'util':67 'via':9,24,82 'wallet':173 'wallet-connect':172 'x':104 'x-payment':103 'x402':10,25,84,110 'x402 notification' 'x402-payment'","prices":[{"id":"10f0c569-713a-409b-8ff3-bc86b75b6465","listingId":"c2031484-2496-4269-9a37-4e21e2443544","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/25","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.350Z"}],"sources":[{"listingId":"c2031484-2496-4269-9a37-4e21e2443544","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/25","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.350Z","lastSeenAt":"2026-04-22T04:02:46.833Z"}],"details":{"listingId":"c2031484-2496-4269-9a37-4e21e2443544","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/25 \\\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 endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/notifications/25"},{"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":"Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/v1/notifications/25"}],"useCases":["Triggering 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 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents needing simple pay-per-call notification access on Base","Projects that want to avoid API key provisioning and subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume notification pipelines where $0.02/request adds up significantly","Anyone requiring non-USDC or non-Base settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.193Z"},"updatedAt":"2026-04-22T04:02:46.833Z"}}