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DataSieve Standard30 Watch — Blockchain & Heartbeat Monitor
x402
DataSieve Standard30 Watch — Blockchain & Heartbeat Monitor is a paid API for AI agents from api.datasieve.xyz, paid per call via x402, $0.35/call, status unknown (last checked 2026-09-15).
Creates a 30-day standing watch on Base blockchain events or a dead-man-switch heartbeat, firing webhook alerts up to 200 times, paid per call via x402.
Price / call$0.35
Success—
StatusUnknown
How this service works
Standing infrastructure for ephemeral AI agents, paid per call over x402. Watches, dead-man switches, and multi-agent coordination. No account; wallet as identity.
Output
Returns a JSON object with a unique watch ID (wt_...), a one-time webhook secret (whsec_...) for authenticating callbacks and status reads, the watch state ('active'), expiry date (30 days out), a trigger cap of 200, a current trigger count, and links to the watch's status and events endpoints.
Example use cases
Whale token transfer alert
“Watch the USDC contract on Base and send a webhook to https://alerts.myapp.com/whale whenever a single transfer exceeds 500,000 USDC — set it up as a standard 30-day watch.”
Trading bot dead-man switch
“Set up a heartbeat dead-man switch for my trading bot called 'trader-prod': it will ping you every 300 seconds, give it a 120-second grace period, and alert my webhook at https://ops.myapp.com/alarm if it goes silent.”
Uniswap price-cross notification
“Create a price-cross watch on Uniswap pool 0xPool...5678 on Base — fire my webhook at https://signal.myapp.com/price when the price of token0 in token1 units crosses above 1.85, valid for the next 30 days.”
Technical details
Endpoint
POSThttps://api.datasieve.xyz/watch/standard30When to prefer
Choose this endpoint when your autonomous agent needs persistent, standing infrastructure on Base blockchain without managing accounts — using wallet-as-identity via x402 micropayment. It is ideal for multi-agent systems needing dead-man switches, on-chain event monitoring (wallet activity, token whale moves, Uniswap price crosses, new pair launches), or cron/one-shot scheduling, all expiring after 30 days with up to 200 trigger firings.
Side effects
- Invalid or missing condition type returns 400 with validation error
- Wallet or token address not a valid 0x address returns 400
- Heartbeat intervalSeconds below 60 or above 604800 returns 400
- Past ISO 8601 timestamp for one-shot scheduling returns 400
- Payment not provided or insufficient via x402 returns 402
- Renew ID (wt_...) not found or already expired returns 404
- Trigger cap of 200 exhausted — watch stops firing events silently until renewed
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": "standard30",
"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": 200,
"triggersUsed": 0
}
}Tags
x402
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