{"id":"3ec1956d-0648-40fc-921c-f076f057fa70","shortId":"eQFTjA","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 `/api/v1/notifications/78` is part of the lowpaymentfee.com platform, a collection of x402-protocol pay-per-call APIs settled in USDC on the Base network. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests. Payment is handled via the x402 protocol: callers include an X-PAYMENT header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys, subscriptions, or rate limits are advertised — access is purely payment-gated.\n\nThe broader lowpaymentfee.com platform offers endpoints across several categories including 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request.\n\nThe specific functionality behind `/api/v1/notifications/78` is not documented beyond the label \"Premium API Access.\" There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawled pages. The endpoint is confirmed live (returns a valid 402 challenge), but what data or service it returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["notifications","infrastructure"],"synonyms":["premium API","notification endpoint","pay-per-call API","x402 API","USDC micropayment API","lowpaymentfee"],"warnings":["No documentation exists for what this endpoint returns upon successful payment","No OpenAPI schema or request/response examples available","The endpoint path '/api/v1/notifications/78' suggests a resource-specific notification but the exact semantics are unknown","The broader platform lists many endpoints but crawled pages beyond the homepage returned only 'Connect wallet' with no content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/notifications/78","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/78","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 via a valid 402 challenge, but there is zero documentation on what the endpoint actually returns, no request/response schema, and no examples. The label 'Premium API Access' is generic and uninformative. The broader site lists many endpoints but provides no detail beyond names and 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'0.02':9,22,95,161 '000':89 '20':88 '402':203 'USDC micropayment API' 'accept':64 'access':62,107,177 'across':119 'advertis':106 'ai':130 'analysi':134 'analyt':124 'api':47,61,99,176 'avail':190 'base':7,20,53,90 'base-network' 'behind':167 'beyond':172 'broader':114 'call':46 'caller':74 'categori':121 'challeng':204 'classif':137 'collect':38 'confirm':198 'convers':154 'crawl':193 'data':123,127,207 'detail':188 'document':171,189 'embed':138 'endpoint':5,18,28,57,118,157,196 'estim':148 'exampl':185 'exchang':143 'export':128 'feed':142 'financ':139 'function':166 'gas':147 'gate':3,16,112 'generat':155 'geocod':152 'handl':69 'header':80 'i.e':94 'includ':75,122 'infrastructur':150 'insight':129 'key':100 'label':59,174 'learn':132 'limit':104 'list':159 'live':199 'lowpaymentfee' 'lowpaymentfee.com':35,115 'machin':131 'metric':125 'network':54 'no-api-key' 'notif':4,17 'notification endpoint' 'offer':117 'openapi':181 'page':194 'part':32 'pay':8,21,44 'pay-per-cal':43 'pay-per-call API' 'pay-per-request' 'payment':67,79,84,111,214 'payment-g':110 'per':10,23,45,96,162 'platform':36,116 'post':65 'post-endpoint' 'premium':60,175 'premium API' 'price':141 'protocol':42,73 'pure':109 'quot':146 'rate':103,144 'report':126 'request':11,24,66,97,163 'request/response':184 'return':200,211 'schema':182 'sentiment':133 'servic':209 'settl':48 'sever':120 'sign':83 'specif':56,165 'subscript':101 'success':213 'summar':136 'text':135 'token':145 'unit':91 'unknown':216 'upon':212 'usdc':13,26,50,93 'usdc-settlement' 'util':151 'valid':153,202 'via':70 'web3':140 'x':78 'x-payment':77 'x402':2,15,41,72 'x402 API' 'x402-gated':1,14 'x402-payment' 'x402-protocol':40","prices":[{"id":"985a1d30-3159-41bc-9583-2a3ed214d93b","listingId":"3ec1956d-0648-40fc-921c-f076f057fa70","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.968Z"}],"sources":[{"listingId":"3ec1956d-0648-40fc-921c-f076f057fa70","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/notifications/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.968Z","lastSeenAt":"2026-04-22T04:02:46.399Z"}],"details":{"listingId":"3ec1956d-0648-40fc-921c-f076f057fa70","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/notifications/78 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/notifications/78"},{"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: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/notifications/78"}],"useCases":["Accessing a notification or alert service via a single paid API call","Integrating pay-per-use notification delivery into an agent workflow","Testing x402 payment protocol integration with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that need simple pay-per-call access without API key management","Low-cost per-request notification or data retrieval"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume notification use cases where per-request pricing may add up","Anyone needing guaranteed SLA or support — no documentation or contact info available"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.641Z"},"updatedAt":"2026-04-22T04:02:46.399Z"}}