{"id":"d76263c0-306b-47fc-9b28-0b830d57b5c7","shortId":"aQr2Mz","kind":"x402","title":"x402-gated notification endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated notification endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/notifications/66` is a POST endpoint that returns JSON and is gated behind a per-request USDC payment on the Base network. The x402 challenge confirms the endpoint is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payment settles on the Base L2 network.\n\nThe specific functionality of the `/api/v1/notifications/66` endpoint is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The notification-related path suggests it may deliver or manage notification data, but this is speculative. Users should test the endpoint to confirm its actual behavior.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-billing","json-response","post-method","no-api-key","notifications"],"categories":["notifications","infrastructure"],"synonyms":["notification API","premium API access","x402 notification","pay-per-call API","USDC gated endpoint","Base network API","lowpaymentfee"],"warnings":["No documentation exists for the /api/v1/notifications/66 endpoint specifically — its purpose is unclear","No OpenAPI or schema definition is available for request or response formats","The site's /api, /pricing, and /README pages returned no useful content (just 'Connect wallet')","The endpoint description is a generic 'Premium API Access' label with no specifics"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/66","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for the specific /notifications/66 resource, no OpenAPI schema, no request/response examples, and the crawled pages beyond the homepage returned only 'Connect wallet' with no useful content. The actual functionality is 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'0.02':9,22,94,139 '000':83 '0x8335':88 '20':82 '2913':89 'Base network API' 'USDC gated endpoint' 'accept':74 'access':34,175 'actual':219 'advertis':101 'ai':109 'analysi':113 'analyt':108 'api':33,105,144,174 'avail':189 'base':7,20,63,84,91,157 'behavior':220 'behind':54 'beyond':170 'broader':98 'call':96 'challeng':67 'classif':115 'commit':152 'confirm':68,217 'convers':132 'crawl':192 'data':107,206 'deliv':202 'detail':187 'document':169,188 'embed':116 'endpoint':5,18,28,47,70,135,166,215 'equal':93 'estim':126 'exact':76 'exact-schem':75 'exampl':184 'exchang':121 'feed':120 'financ':117 'function':162 'gas':125 'gate':3,16,53 'generat':133 'generic':172 'geocod':130 'infrastructur':128 'json':50 'json-response' 'key':145 'l2':158 'label':176 'learn':111 'limit':148 'list':137 'live':72 'lowpaymentfee' 'lowpaymentfee.com':30,99 'machin':110 'manag':204 'may':201 'minimum':151 'network':64,159 'no-api-key' 'notif':4,17,196,205 'notification API' 'notification-rel':195 'notifications' 'openapi':180 'page':193 'path':198 'pay':8,21 'pay-per-call API' 'payment':38,60,78,153 'per':10,23,57,95,140 'per-request':56 'per-request-billing' 'platform':100 'post':46 'post-method' 'premium':32,173 'premium API access' 'price':119 'protocol':39 'provid':31 'quot':124 'rate':122,147 'relat':197 'request':11,24,58,141 'request/response':183 'resourc':42 'return':49 'schema':181 'scheme':77 'sentiment':112 'settl':154 'span':106 'specif':41,161 'specul':210 'suggest':199 'suit':103 'summar':114 'test':213 'token':123 'unit':85 'usdc':13,26,59,87 'usdc-base' 'user':211 'util':129 'valid':131 'via':35 'web3':118 'x402':2,15,37,66 'x402 notification' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"6405bf2c-eca3-4e0b-844a-7cef330cb040","listingId":"d76263c0-306b-47fc-9b28-0b830d57b5c7","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:32.084Z"}],"sources":[{"listingId":"d76263c0-306b-47fc-9b28-0b830d57b5c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:32.084Z","lastSeenAt":"2026-04-22T04:02:46.534Z"}],"details":{"listingId":"d76263c0-306b-47fc-9b28-0b830d57b5c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/66 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/notifications/66"},{"claim":"All endpoints are listed 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"}],"useCases":["Retrieving or triggering notification data via a pay-per-request 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 payment-gated APIs","Agents that need keyless, pay-per-call access to notification endpoints","Low-volume consumers who want no subscription commitments"],"notFor":["High-volume notification pipelines where $0.02/request adds up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.533Z"},"updatedAt":"2026-04-22T04:02:46.534Z"}}