{"id":"b8e49cbe-5d10-4f6b-9ef4-b13e0585fb75","shortId":"t7pj9H","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402, settling in USDC at $0.02/request.","tagline":"Pay-per-call notification endpoint on Base via x402, settling in USDC at $0.02/request.","description":"This endpoint at `/api/v1/notifications/2` is part of the lowpaymentfee.com platform, a collection of pay-per-request APIs accessible via the x402 payment protocol on the Base network. The endpoint is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC (contract `0x8335…2913` on Base). The x402 challenge advertises a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform offers endpoints across several categories: 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 (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific functionality of the `/api/v1/notifications/2` endpoint is not documented beyond its \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is confirmed live (returning a valid 402 x402 challenge), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notifications","post-method"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notification","pay-per-call API","lowpaymentfee","USDC micropayment API","Base network API"],"warnings":["No documentation exists for the /api/v1/notifications/2 endpoint beyond its generic label","No OpenAPI schema, request body schema, or response schema available","The actual functionality (send notification? retrieve notification? what is '2'?) is entirely unknown","No robots.txt or agents.txt found at the origin"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/2","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/2","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 listing title is generic ('Premium API Access') and the crawled pages provide no specifics about this particular route. This is effectively a 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'/request':16,32 '0.02':15,31,99,149 '000':90 '0x8335':77 '20':89 '2913':78 '402':205 '6':95 'Base network API' 'USDC micropayment API' 'accept':69 'access':51,67,178 'across':108 'actual':211 'advertis':84 'ai':118 'amount':87 'analysi':122 'analyt':112 'api':50,66,154,177 'avail':192 'base':8,24,59,80,91 'base-network' 'beyond':174 'broader':103 'call':4,20 'categori':110 'challeng':83,207 'classif':125 'collect':44 'commit':162 'confirm':200 'contract':76 'convers':141 'crawl':195 'data':111,115 'decim':96 'detail':190 'document':173,191 'embed':126 'endpoint':6,22,34,62,107,144,170,198 'equal':98 'estim':136 'exampl':187 'exchang':131 'export':116 'feed':130 'financ':127 'function':166 'gas':135 'generat':142 'geocod':139 'infrastructur':138 'insight':117 'key':155 'label':64,179 'learn':120 'limit':158 'live':201 'lowpaymentfee' 'lowpaymentfee.com':41,104 'machin':119 'maximum':86 'metric':113 'minimum':161 'network':60 'notif':5,21 'notification API' 'notifications' 'offer':106 'openapi':183 'page':196 'part':38 'pay':2,18,47 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':46 'payment':55,73,215 'per':3,19,48,100,150 'platform':42,105 'post':70 'post-method' 'premium':65,176 'premium API access' 'price':129,146 'protocol':56 'quot':134 'rate':132,157 'report':114 'request':49,71,101,151 'request/response':186 'requir':163 'return':202,212 'schema':184 'sentiment':121 'settl':11,27,72 'sever':109 'specif':165 'success':214 'summar':124 'text':123 'token':133 'uniform':147 'unit':92 'unknown':217 'upon':213 'usdc':13,29,75,94 'usdc-settlement' 'valid':140,204 'via':9,25,52 'web3':128 'x402':10,26,54,82,206 'x402 notification' 'x402-payment'","prices":[{"id":"9b9751f6-d295-42b0-877e-a2abd7e751a4","listingId":"b8e49cbe-5d10-4f6b-9ef4-b13e0585fb75","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:29.104Z"}],"sources":[{"listingId":"b8e49cbe-5d10-4f6b-9ef4-b13e0585fb75","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:29.104Z","lastSeenAt":"2026-04-22T02:32:10.664Z"}],"details":{"listingId":"b8e49cbe-5d10-4f6b-9ef4-b13e0585fb75","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/2 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/2"},{"claim":"All endpoints 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/2"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Integrating low-cost notification services into agent workflows on Base","Testing x402 payment protocol integrations with a cheap live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agent pipelines needing keyless, pay-per-use notification endpoints","Low-volume use cases where $0.02/request is cost-effective"],"notFor":["High-volume notification workloads where per-request costs add up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:56.703Z"},"updatedAt":"2026-04-22T02:32:10.664Z"}}