{"id":"7ac57dd4-6ffe-40b0-951e-ffadf088e611","shortId":"Eb2beu","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/76` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 protocol to accept per-call USDC payments on the Base network with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint listed here is described as \"Premium API Access\" and is priced at 20,000 base units of USDC (0.02 USD per request, since USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to a designated wallet address on Base. The endpoint accepts HTTP POST requests and returns `application/json` responses. A 300-second payment timeout is configured.\n\nThe broader lowpaymentfee.com platform advertises additional endpoints across categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 per request price point. However, no OpenAPI schema, detailed request/response documentation, or usage examples are available from the crawled pages, so the exact input parameters and response structure for this notifications endpoint remain unknown.","tags":[],"capabilities":["x402-payment","per-call-billing","usdc-settlement","base-network","json-response","http-post","notifications"],"categories":["notifications","infrastructure"],"synonyms":["premium API access","notification API","pay-per-call API","x402 notification","lowpaymentfee","USDC micropayment API","Base network API"],"warnings":["No API documentation, OpenAPI spec, or request/response schema available for this endpoint","The exact purpose and expected input/output of /api/v1/notifications/76 is undocumented","The landing page lists many endpoint categories but this specific notifications path does not appear among them","Crawled subpages (/api, /pricing, /README) returned no meaningful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/76","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/76","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 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI schema, no request/response documentation, no examples, and the purpose of the 'notifications/76' endpoint is entirely unclear beyond the generic 'Premium API Access' label. The crawled pages beyond the landing page returned only 'Connect wallet' with no useful 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'/request':16,32 '0.02':15,31,112,184 '000':107 '20':106 '300':148 '6':119 'Base network API' 'USDC micropayment API' 'accept':70,139 'access':101 'across':161 'addit':159 'address':134 'advertis':158 'ai/ml':56 'analysi':165 'analyt':55 'api':52,82,100 'application/json':145 'avail':200 'base':8,24,78,108,136 'base-network' 'broader':155 'call':4,20,73 'categori':162 'classif':168 'collect':46 'configur':153 'convers':176 'crawl':203 'crypto':59 'data':54,178 'decim':120 'describ':97 'design':132 'detail':193 'document':195 'embed':169 'endpoint':6,22,34,64,93,138,160,216 'exact':127,207 'exampl':198 'exchang':172 'export':179 'feed':171 'financ':58 'geocod':174 'howev':189 'http':140 'http-post' 'includ':163 'infer':57 'input':208 'json-response' 'key':83 'limit':86 'list':94 'lowpaymentfee' 'lowpaymentfee.com':41,156 'made':123 'network':79 'notif':5,21,215 'notification API' 'notifications' 'offer':44 'openapi':191 'page':204 'paramet':209 'part':38 'pay':2,18,49 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':48 'payment':75,121,150 'per':3,19,50,72,114,185 'per-cal':71 'per-call-billing' 'platform':42,157 'point':188 'post':141 'premium':99 'premium API access' 'price':104,170,187 'protocol':68 'rate':85,173 'remain':217 'request':51,115,142,186 'request/response':194 'requir':90 'respons':146,211 'return':144 'schema':192 'scheme':128 'second':149 'sentiment':164 'servic':62 'settl':11,27,129 'sinc':116 'span':53 'specif':92 'structur':212 'subscript':89 'summar':167 'text':166 'timeout':151 'unit':109 'unknown':218 'usag':197 'usd':113 'usdc':13,29,74,111,117 'usdc-settlement' 'use':65,118 'util':61 'valid':175 'via':9,25,124 'wallet':133 'x402':10,26,67,126 'x402 notification' 'x402-payment'","prices":[{"id":"540fa401-a22b-4dfb-9eb9-d257436f7006","listingId":"7ac57dd4-6ffe-40b0-951e-ffadf088e611","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/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.003Z"}],"sources":[{"listingId":"7ac57dd4-6ffe-40b0-951e-ffadf088e611","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.003Z","lastSeenAt":"2026-04-22T05:32:23.093Z"}],"details":{"listingId":"7ac57dd4-6ffe-40b0-951e-ffadf088e611","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/76 \\\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/76"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/76"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Integrating notification functionality into agent workflows that settle payments in USDC on Base","Accessing premium notification data with no subscription or rate-limit constraints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go notification access","AI agents that can autonomously pay for API calls via x402","Projects already operating on the Base network with USDC liquidity"],"notFor":["High-volume notification use cases where per-call pricing becomes expensive compared to flat-rate plans","Users who need detailed API documentation or guaranteed SLAs before integrating","Applications requiring non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.611Z"},"updatedAt":"2026-04-22T05:32:23.093Z"}}