{"id":"dd9098b6-d77f-4cb0-aa44-dca9db384019","shortId":"zBAEwj","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/22`. 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 uniformly at $0.02 per request and settled in USDC on the Base network via the x402 protocol.\n\nThe specific `/api/v1/notifications/22` 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, since USDC uses 6 decimals). No API keys, accounts, or rate limits are advertised — access is entirely gated by micropayment. The x402 challenge confirms the endpoint is live and version 1 of the protocol is in use.\n\nBecause the endpoint path references \"notifications/22\", it likely retrieves or triggers a specific notification resource, but no further documentation, request body schema, or response schema is available from the crawled material. The platform's landing page lists many other endpoints (sentiment analysis, text summarization, geocoding, price feeds, etc.) at the same $0.02 price point, suggesting a consistent API design across the suite. However, detailed docs for any individual endpoint were not found.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","notifications","json-response","no-api-key","post-method"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notification","micropayment API","pay-per-request API","lowpaymentfee","USDC API","Base network API"],"warnings":["No documentation found for the /api/v1/notifications/22 endpoint — its purpose, request format, and response format are unknown.","No OpenAPI spec, no AI plugin manifest, and no robots.txt or agents.txt discovered.","The crawled /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content.","The endpoint name 'Premium API Access' is generic and does not describe functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/22","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/22","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 via a valid 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation for the specific /notifications/22 resource — no request body schema, no response schema, no description of what the endpoint actually does beyond the generic label \"Premium API Access\". This is effectively a stub 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'/request':16,32 '0.02':15,31,75,126,215 '000':120 '1':157 '20':119 '6':130 'Base network API' 'USDC API' 'accept':94 'access':41,141 'account':135 'across':223 'advertis':140 'ai/ml':64 'analysi':205 'analyt':63 'api':40,60,133,221 'application/json':99 'attach':105 'avail':190 'base':8,24,84,121 'base-network' 'bodi':184 'broader':51 'call':4,20,59 'caller':104 'challeng':149 'confirm':150 'consist':220 'contain':111 'crawl':193 'data':62 'decim':131 'design':222 'detail':227 'doc':228 'document':182 'dozen':54 'endpoint':6,22,34,93,152,166,203,232 'entir':143 'etc':211 'feed':210 'financ':66 'found':235 'gate':144 'geocod':208 'handl':102 'header':110 'howev':226 'i.e':125 'individu':231 'infer':65 'infrastructur':69 'inlin':103 'json-response' 'key':134 'land':198 'like':171 'limit':138 'list':200 'live':154 'lowpaymentfee' 'lowpaymentfee.com':36 'mani':201 'materi':194 'micropay':146 'micropayment API' 'network':85 'no-api-key' 'notif':5,21,42,177 'notification API' 'notifications' 'notifications/22':169 'offer':53 'page':199 'part':48 'path':167 'pay':2,18,57 'pay-per-cal':1,17,56 'pay-per-call' 'pay-per-request API' 'payment':100,109,115 'per':3,19,58,76 'platform':52,196 'point':217 'post':95 'post-method' 'premium':39 'premium API access' 'price':72,209,216 'protocol':89,160 'provid':37 'rate':137 'refer':168 'request':77,96,183 'resourc':43,178 'respons':187 'retriev':172 'return':98 'schema':185,188 'sentiment':204 'settl':11,27,79 'sign':113 'sinc':127 'span':61 'specif':91,176 'suggest':218 'suit':225 'summar':207 'text':206 'trigger':174 'uniform':73 'unit':122 'usdc':13,29,81,124,128 'usdc-settlement' 'use':129,163 'util':70 'version':156 'via':9,25,86 'web3':67 'x':108 'x-payment':107 'x402':10,26,88,114,148 'x402 notification' 'x402-payment'","prices":[{"id":"e2e7ca3d-c9fd-4c27-9c04-b3e31022ab61","listingId":"dd9098b6-d77f-4cb0-aa44-dca9db384019","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:28.894Z"}],"sources":[{"listingId":"dd9098b6-d77f-4cb0-aa44-dca9db384019","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:28.894Z","lastSeenAt":"2026-04-22T02:32:10.364Z"}],"details":{"listingId":"dd9098b6-d77f-4cb0-aa44-dca9db384019","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/22 \\\n  -H \"X-PAYMENT: <x402-signed-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/22"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/22"},{"claim":"All APIs on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs 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","Testing x402 micropayment flows against a live endpoint"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call notification access","x402 protocol experimentation on Base with low-cost USDC payments","Scenarios where no API key management is desired"],"notFor":["High-volume notification use cases where per-call pricing adds up quickly","Users who need detailed API documentation or guaranteed SLAs","Non-crypto users who cannot settle payments in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.942Z"},"updatedAt":"2026-04-22T02:32:10.364Z"}}