{"id":"6ce3e470-bef4-4cf4-9010-4f4092d35c8f","shortId":"rEnrgZ","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/14` is part of the lowpaymentfee.com platform, which offers a broad 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. The specific endpoint probed here is labeled \"Premium API Access\" and accepts POST requests.\n\nThe x402 challenge confirms the endpoint is live and requires a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. Payment is made to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a timeout of 300 seconds.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, there is no OpenAPI schema, no detailed documentation for request/response formats, and no examples available from the crawled pages. The exact functionality of the `/notifications/14` endpoint is unclear — the name suggests a notification-related resource but no further specification is provided. Other endpoints on the platform cover sentiment analysis, text summarization, geocoding, price feeds, and more, all at the same $0.02 price point.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","notification-api","post-method"],"categories":["infrastructure","notifications"],"synonyms":["premium API access","notification endpoint","x402 API","USDC micropayment API","lowpaymentfee","pay-per-call API","Base network API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact functionality of /api/v1/notifications/14 is undocumented — 'Premium API Access' is a generic label","No request body or response body examples are available from crawled content","The broader platform lists many endpoints but none have detailed docs beyond a name and price"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/14","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/14","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 with clear pricing. However, there is no OpenAPI schema, no documentation of request/response formats, and the specific purpose of the /notifications/14 endpoint is unexplained. Effectively a stub 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'/notifications/14':190 '/request':16,32,137 '0.02':15,31,124,136,227 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x8335':112 '20':106 '2913':113 '300':151 '6':119 'Base network API' 'USDC micropayment API' 'accept':89 'access':87,164 'across':138 'address':145 'advertis':132,155 'ai/ml':57 'analysi':215 'analyt':56 'api':53,86,157 'avail':180 'base':8,24,76,108,115 'base-network' 'broad':46 'call':4,20 'challeng':94 'confirm':95 'consist':127 'cover':213 'crawl':183 'data':55 'decim':120 'detail':172 'document':173 'endpoint':6,22,34,65,80,97,140,191,209 'exact':186 'exampl':179 'feed':220 'financ':59 'flat':133 'format':176 'function':187 'geocod':218 'howev':165 'infer':58 'infrastructur':62 'instant':163 'key':158 'label':84 'limit':161 'live':99 'lowpaymentfee' 'lowpaymentfee.com':41 'made':143 'maximum':103 'name':195 'network':77 'notif':5,21,199 'notification endpoint' 'notification-api' 'notification-rel':198 'offer':44 'openapi':169 'page':184 'part':38 'pay':2,18,50 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':49 'payment':69,104,141 'per':3,19,51,125 'platform':42,154,212 'point':229 'post':90 'post-method' 'premium':85 'premium API access' 'price':134,219,228 'probe':81 'protocol':70 'provid':207 'rate':160 'relat':200 'request':52,91,126 'request/response':175 'requir':101 'resourc':201 'schema':170 'second':152 'sentiment':214 'settl':11,27,71 'sinc':116 'site':130 'span':54 'specif':79,205 'suggest':196 'suit':47 'summar':217 'text':216 'timeout':149 'translat':122 'unclear':193 'unit':109 'usdc':13,29,73,111,117 'usdc-settlement' 'use':66,118 'util':63 'via':9,25 'web3':60 'x402':10,26,68,93 'x402 API' 'x402-payment'","prices":[{"id":"7afa6c5a-67f6-4d83-afbd-1dd3c7c95d70","listingId":"6ce3e470-bef4-4cf4-9010-4f4092d35c8f","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.166Z"}],"sources":[{"listingId":"6ce3e470-bef4-4cf4-9010-4f4092d35c8f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.166Z","lastSeenAt":"2026-04-22T04:02:46.640Z"}],"details":{"listingId":"6ce3e470-bef4-4cf4-9010-4f4092d35c8f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/14 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/14"},{"claim":"All endpoints are priced at $0.02/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/14"}],"useCases":["Triggering or retrieving notifications via a pay-per-call model","Integrating low-cost API calls into agent workflows without API key management","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers experimenting with x402 pay-per-request patterns","Agents needing keyless, on-demand API access settled in USDC","Low-volume or bursty workloads where per-call pricing is preferable to subscriptions"],"notFor":["High-volume use cases where $0.02/request adds up significantly","Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.373Z"},"updatedAt":"2026-04-22T04:02:46.640Z"}}