{"id":"878a0f91-fd99-420e-9a00-ea76124474da","shortId":"gUkL5y","kind":"x402","title":"Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call notification endpoint on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at `/api/v1/notifications/7` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests. Payment is $0.02 per call (20,000 base units of USDC with 6 decimals), with no API keys, rate limits, or upfront commitments required.\n\nThe broader lowpaymentfee.com platform advertises 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 listed at $0.02 per request. However, the specific functionality of the `/api/v1/notifications/7` endpoint is not documented beyond its \"Premium API Access\" label — it is unclear what notification data or action it provides.\n\nThe endpoint is live and returns a valid x402 402 challenge. Payment is made in USDC (contract `0x8335…2913`) on Base to address `0x1A2B…85F3`, with a max timeout of 300 seconds. No OpenAPI schema, request/response examples, or detailed documentation were found for this specific endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","notifications","post-method"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notification","pay-per-call API","lowpaymentfee","USDC API","Base network API"],"warnings":["No documentation found for the /api/v1/notifications/7 endpoint — its actual functionality is unknown","No OpenAPI or schema available; request body and response format are undocumented","The /pricing, /api, and /README pages returned no meaningful content","The endpoint name 'Premium API Access' is generic and does not describe what the endpoint does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/7","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/notifications/7 is entirely unclear. The crawled site pages beyond the landing page returned only 'Connect wallet' with no useful 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'0.02':11,26,76,144 '000':80 '0x1a2b':197 '0x8335':191 '20':79 '2913':192 '300':204 '402':183 '6':86 '85f3':198 'Base network API' 'USDC API' 'accept':71 'access':69,162 'across':104 'action':171 'address':196 'advertis':102 'ai':114 'analysi':118 'analyt':108 'api':50,68,90,161 'base':8,23,58,81,194 'base-network' 'beyond':158 'broader':99 'call':4,19,78 'categori':106 'challeng':184 'classif':121 'collect':44 'commit':96 'contract':190 'convers':137 'data':107,111,169 'decim':87 'detail':212 'document':157,213 'embed':122 'endpoint':6,21,32,64,103,140,154,175,219 'estim':132 'exampl':210 'exchang':127 'export':112 'feed':126 'financ':123 'found':215 'function':150 'gas':131 'generat':138 'geocod':135 'howev':147 'infrastructur':134 'insight':113 'key':91 'label':66,163 'learn':116 'limit':93 'list':142 'live':177 'lowpaymentfee' 'lowpaymentfee.com':39,100 'machin':115 'made':187 'max':201 'metric':109 'network':59 'notif':5,20,168 'notification API' 'notifications' 'offer':42 'openapi':207 'part':36 'pay':2,17,47 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':46 'payment':74,185 'per':3,12,18,27,48,77,145 'platform':40,101 'post':72 'post-method' 'premium':67,160 'premium API access' 'price':125 'protocol':55 'provid':173 'quot':130 'rate':92,128 'report':110 'request':13,28,49,73,146 'request/response':209 'requir':97 'return':179 'schema':208 'second':205 'sentiment':117 'settl':51 'sever':105 'specif':63,149,218 'summar':120 'text':119 'timeout':202 'token':129 'unclear':166 'unit':82 'upfront':95 'usdc':15,30,61,84,189 'usdc-settlement' 'use':60 'valid':136,181 'via':9,24,52 'web3':124 'x402':10,25,54,182 'x402 notification' 'x402-payment'","prices":[{"id":"9763d6c6-9ace-4878-ad3b-19ed0069318c","listingId":"878a0f91-fd99-420e-9a00-ea76124474da","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.993Z"}],"sources":[{"listingId":"878a0f91-fd99-420e-9a00-ea76124474da","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.993Z","lastSeenAt":"2026-04-22T04:02:46.431Z"}],"details":{"listingId":"878a0f91-fd99-420e-9a00-ea76124474da","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/7 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/7"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, rate limits, or commitments","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 contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/notifications/7"}],"useCases":["Sending or retrieving notifications via a pay-per-call model without API key management","Agent-initiated notification triggers settled instantly in USDC on Base","Integrating low-cost notification services into automated workflows"],"bestFor":["Developers wanting zero-signup, pay-per-use notification endpoints","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integration","High-volume notification use cases where per-call pricing may add up","Anyone requiring fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.656Z"},"updatedAt":"2026-04-22T04:02:46.431Z"}}