{"id":"4b1f0982-996c-489f-86c0-b8f041b6e6ad","shortId":"Ae2kM4","kind":"x402","title":"Pay-per-call notifications endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call notifications endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides a notifications API accessible via the x402 payment protocol. The specific path `/api/v1/notifications/10` accepts POST requests and charges 0.02 USDC per call (20,000 base units of USDC on Base network, which has 6 decimals). Payment is settled on-chain on Base to the specified wallet address, with no API keys, rate limits, or upfront commitments required.\n\nThe broader lowpaymentfee.com platform offers a suite of pay-per-call APIs spanning data & analytics (metrics, reports, data export, insights), AI & machine learning (sentiment analysis, text summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are uniformly priced at $0.02 per request and use the same x402 payment mechanism on Base with USDC.\n\nThe specific functionality of the `/api/v1/notifications/10` endpoint is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is confirmed live (returns a valid 402 challenge), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","notifications-api","no-api-key","no-rate-limit"],"categories":["notifications","infrastructure"],"synonyms":["notifications API","premium API access","x402 notifications","pay-per-call notifications","lowpaymentfee","USDC API","Base network API"],"warnings":["No documentation exists for the /api/v1/notifications/10 endpoint beyond the label 'Premium API Access'","No OpenAPI schema, request body format, or response format is available","The /pricing, /api, and /README pages returned no useful content (just 'Connect wallet')","Actual functionality of this specific endpoint is unknown — it may be a placeholder or test endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/10","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but there is no documentation on what the notifications endpoint actually does, no request/response schema, and no examples. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The endpoint's purpose is effectively a 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'/request':16,32 '0.02':15,31,56,149 '000':61 '20':60 '402':204 '6':71 'Base network API' 'USDC API' 'accept':51 'access':41,178 'actual':209 'address':85 'ai':117 'analysi':121 'analyt':111 'api':40,88,108,177 'avail':191 'base':8,24,62,67,80,160 'base-network' 'beyond':173 'broader':97 'call':4,20,59,107 'chain':78 'challeng':205 'charg':55 'classif':124 'commit':94 'confirm':199 'convers':141 'crawl':194 'data':110,114 'decim':72 'detail':189 'document':172,190 'embed':125 'endpoint':6,22,34,144,169,197 'estim':135 'exampl':186 'exchang':130 'export':115 'feed':129 'financ':126 'function':165 'gas':134 'generat':142 'geocod':139 'infrastructur':137 'insight':116 'key':89 'label':175 'learn':119 'limit':91 'live':200 'lowpaymentfee' 'lowpaymentfee.com':36,98 'machin':118 'mechan':158 'metric':112 'network':68 'no-api-key' 'no-rate-limit' 'notif':5,21,39 'notifications API' 'notifications-api' 'offer':100 'on-chain':76 'openapi':182 'page':195 'path':49 'pay':2,18,105 'pay-per-cal':1,17,104 'pay-per-call' 'pay-per-call notifications' 'payment':45,73,157,213 'per':3,19,58,106,150 'platform':99 'post':52 'premium':176 'premium API access' 'price':128,147 'protocol':46 'provid':37 'quot':133 'rate':90,131 'report':113 'request':53,151 'request/response':185 'requir':95 'return':201,210 'schema':183 'sentiment':120 'settl':11,27,75 'span':109 'specif':48,164 'specifi':83 'success':212 'suit':102 'summar':123 'text':122 'token':132 'uniform':146 'unit':63 'unknown':215 'upfront':93 'upon':211 'usdc':13,29,57,65,162 'usdc-settlement' 'use':153 'util':138 'valid':140,203 'via':9,25,42 'wallet':84 'web3':127 'x402':10,26,44,156 'x402 notifications' 'x402-payment'","prices":[{"id":"ac2649c3-07e2-4eb2-a2f8-c9230e895a88","listingId":"4b1f0982-996c-489f-86c0-b8f041b6e6ad","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/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.267Z"}],"sources":[{"listingId":"4b1f0982-996c-489f-86c0-b8f041b6e6ad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.267Z","lastSeenAt":"2026-04-22T04:02:46.740Z"}],"details":{"listingId":"4b1f0982-996c-489f-86c0-b8f041b6e6ad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/10 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/10"},{"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 APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/10"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Integrating low-cost notification triggers into agent workflows","Testing x402 payment protocol integrations with a live, inexpensive endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing simple pay-per-call notification access on Base","Projects that want to avoid API key provisioning and subscription commitments"],"notFor":["Production notification systems requiring documented schemas and SLAs","Use cases needing high-volume notifications at sub-cent pricing","Anyone requiring detailed documentation or guaranteed response formats"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.226Z"},"updatedAt":"2026-04-22T04:02:46.740Z"}}