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DataSieve Standard Watch
x402
DataSieve Standard Watch is a paid API for AI agents from api.datasieve.xyz, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).
Sets up a 7-day event-driven monitor on Base chain activity, heartbeat/dead-man switch, cron/schedule, or URL change, pushing HMAC-signed events to a webhook or pollable mailbox.
Price / call$0.1
Success—
StatusUnknown
How this service works
Something you cannot do while your agent is dead: keep watching. One paid call buys 7 days of it — on-chain on Base (wallet activity, whale transfers, price crossings, new pools), a dead-man switch that fires when YOUR agent goes silent, a cron/schedule webhook, or a url-change web monitor. Every event carries a signed Ed25519 receipt proving a third party observed it then — which your own logs cannot. Webhook or pollable mailbox. No account: the wallet is the identity. 50 triggers.
Output
Returns a watch ID (wt_...), a shared secret for HMAC verification, and (for heartbeat conditions) a pingUrl the agent must call periodically. Events matching the condition are pushed to the caller's webhook as HMAC-signed JSON payloads and stored in a pollable mailbox with an Ed25519 receipt. Up to 50 triggers over 7 days; renewal is available via the renew field.
Example use cases
Example prompt
“Set up a 7-day whale alert on Base: watch the USDC token contract for any transfer over 500,000 USDC and push a signed event to my webhook at https://myagent.example.com/hook — I want to poll the mailbox too if the webhook misses anything.”
Technical details
Endpoint
POSThttps://api.datasieve.xyz/watch/standardWhen to prefer
Choose this endpoint when you need event-driven, push-based monitoring of Base chain activity (wallets, whale transfers, price crossings, new pairs), agent liveness via heartbeat, time-based webhook scheduling, or URL change detection — all without account creation and with cryptographic receipts for auditability. Prefer it over polling-based alternatives when you want low-latency alerts, HMAC-signed payloads, and a fallback mailbox. Best when you need a quick, no-registration paid watch that self-expires in 7 days and can be renewed cheaply.
Side effects
- Payment fails or is insufficient — call not billed, no watch created
- Invalid or missing required condition fields — 400 validation error
- Webhook URL unreachable at delivery time — events queued in mailbox instead
- Watch expires after 7 days without renewal — no further events fired
- More than 50 triggers consumed — watch stops firing until renewed
- Invalid wallet/token/pool address format — rejected at creation time
- Heartbeat interval below 60 seconds or above 604800 — rejected
- Cron or ISO 8601 time is in the past — rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| renew | string | INSTEAD of the other fields: pass an existing standard watch id (wt_...) to renew it for another 7 days at the same price |
| condition | object | One watch condition. type selects the kind; the other fields depend on it. ANY condition also accepts debounceSeconds (collapse a burst of matches into one delivery — set it unless you want every hit, because a watch stops at its trigger cap) and dedupeKey (never fire twice for the same logical event). |
| webhookUrl | string | optional https endpoint to receive HMAC-signed event POSTs; omit to poll GET /watch/:id/events instead |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "wt_01jzyx8k2mabcdefghjkmn",
"tier": "standard",
"links": {
"events": "https://api.datasieve.xyz/watch/wt_01jzyx8k2mabcdefghjkmn/events",
"status": "https://api.datasieve.xyz/watch/wt_01jzyx8k2mabcdefghjkmn"
},
"state": "active",
"secret": "whsec_...returned once, keep it: it authenticates status/events reads and signs your webhooks",
"expiresAt": "2026-07-17T00:00:00.000Z",
"triggerCap": 50,
"triggersUsed": 0
}
}Tags
x402
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