{"uid":"cap_UKQTKSJtyk3QtI87JVt0I","slug":"seneschal-private-watch-monero-zcash-payment-webhook-92e53760","name":"Seneschal Private Watch — Monero/Zcash Payment Webhook","description":"Create a Monero or Zcash view-key payment watch. The $0.10 fee IS your starting credit (nothing is lost to a creation charge). Body: { chain, address, viewKey, webhookUrl, birthdayHeight? }. Returns { watchId, watchToken, webhookSecret, expiresAt, creditAtomic }; verify webhooks with HMAC-SHA256(webhookSecret, body), top up via /v1/private/topup*. Prefer no USDC? POST /v1/private/watch-crypto (free call) creates + funds the watch in XMR/ZEC.","url":"https://api.seneschal.space/v1/private/watch","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"chain":{"enum":["monero","zcash"],"type":"string"},"address":{"type":"string","description":"Receiving address to watch."},"viewKey":{"type":"string","description":"READ-ONLY view key (Monero private view key or Zcash UFVK). Cannot spend."},"webhookUrl":{"type":"string","format":"uri","description":"HTTPS endpoint that receives an HMAC-signed POST per inbound payment."},"birthdayHeight":{"type":"integer","description":"Optional scan-from height (defaults to tip)."}}},"responseSchema":{"type":"json","example":{"chain":"monero","address":"<your-receiving-address>","watchId":"w_3f9c2e1a","expiresAt":"2026-07-12T00:00:00.000Z","watchToken":"<secret-bearer-token>","pricingTier":"standard","creditAtomic":"20000","testEndpoint":"/v1/private/watch/w_3f9c2e1a/test","webhookSecret":"<hmac-sha256-key>","topupEndpoints":{"10c":"/v1/private/topup","1usd":"/v1/private/topup-1","5usd":"/v1/private/topup-5"},"pollIntervalSec":60,"signatureHeader":"<Signature-Header>: sha256=<HMAC-SHA256(webhookSecret, body)>","ratePerDayAtomic":"20000","ratePerCallAtomic":"5000"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.1","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.1/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.1","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_UM71buXVRJ5--WiVVkqgs","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.1","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Registers a view-key-based watcher on a Monero or Zcash address and fires an HMAC-signed webhook to your URL the moment an inbound payment arrives.","exampleAgentPrompt":"Watch my Monero address 4AdUndXHHZ6cfufTMvppY6JwXNouMBzSkbLYfpAV... using view key a1b2c3... and POST a signed notification to https://myapp.example.com/hooks/xmr-payment whenever a payment lands there.","exampleUseCases":null,"resultDescription":"A confirmation that the watch has been registered. Subsequently, whenever an inbound payment is detected on-chain at the specified address, Seneschal delivers an HMAC-signed HTTP POST to the provided webhook URL containing payment details such as amount and transaction ID.","failureModes":["Invalid or incompatible view key for the given chain — returns 400 with key mismatch error","Webhook URL unreachable or not HTTPS — rejected at registration","Insufficient x402 USDC balance to cover idle fee — watch not created or suspended","Invalid address format for selected chain — 400 bad request","Birthday height beyond current chain tip — scan error"],"whenToPreferThis":"Use this endpoint when you need real-time, server-push notification of inbound Monero or Zcash payments without custodying a spend key. It is uniquely suited for privacy-coin payment acceptance flows where polling is impractical and you only have a read-only view key. Prefer over generic blockchain explorers when you need webhook delivery, HMAC signing, and per-event billing via x402.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T06:39:52.647Z","isFirstParty":false}