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2s Stock Price Watcher
x402
2s Stock Price Watcher is a paid API for AI agents from 2s.io, paid per call via x402, $0.125/call, status unknown (last checked 2026-09-14).
Registers a webhook-based alert that fires when a US-listed stock price crosses a specified threshold condition (above, below, or percent move)
Price / call$0.125
Success—
StatusUnknown
How this service works
The (most) everything API: 575+ pay-per-call endpoints for AI agents — ground-truth data, a full AI gateway, and agent infrastructure (storage, queues, watchers). USDC via x402, no signup, no API keys, and upto billing: pay actual usage, not the quote.
Output
A confirmation that the watcher has been registered. When the price condition is met, the service POSTs a signed JSON event to the specified callbackUrl, including the ticker, trigger details, and any custom payload supplied at registration time. The watcher fires up to maxFires times and auto-expires after the configured duration.
Example use cases
Example prompt
“Set up a price watcher for AAPL that fires a webhook to https://my-agent.app/hooks/price when the stock goes above $220 — make it a one-shot alert that expires in 7 days, and tag it with label 'aapl-breakout'.”
Technical details
Endpoint
POSThttps://2s.io/api/watchers/stock-priceWhen to prefer
Use this endpoint when you need event-driven, asynchronous notification of a US stock price crossing a threshold, rather than polling a price endpoint repeatedly. Ideal for agent workflows that need to react to market conditions without maintaining an active polling loop. Prefer this over a simple price-lookup endpoint when the trigger is conditional and timing is unknown.
Side effects
- Invalid or unlisted ticker symbol — watcher not created
- callbackUrl unreachable or malformed — registration may succeed but callbacks will fail silently
- threshold not appropriate for conditionType (e.g. negative price for above/below) — validation error
- expiresInSeconds out of allowed range (60–7776000) — rejected
- maxFires outside 1–1000 range — rejected
- Payment not received or insufficient USDC — 402 response, watcher not created
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| label | string | Optional free-text tag to recognize this watcher later. |
| ticker | string | US-listed ticker to watch, e.g. AAPL. |
| payload | object | Arbitrary JSON echoed back verbatim in every callback so you can route/identify the event. e.g. {"agentId":"a1"} |
| maxFires | integer | Stop after this many callbacks (default 1 — a one-shot alert). Each fire is a fresh crossing into the condition. |
| threshold | number | The trigger level. A USD price for above/below (e.g. 200), or a percent for pct_up/pct_down (e.g. 5 = ±5%). |
| callbackUrl | string | Where we POST the event. Any http(s) URL; the JSON body is signed (verify with X-2s-Signature). e.g. https://your-agent.app/hooks/price |
| conditionType | string | above/below = threshold is a USD price; pct_up/pct_down = threshold is a percent move vs the prior close. |
| expiresInSeconds | integer | How long the watch stays active, in seconds. Default 2592000 (30 days), max 7776000 (90 days). |
Tags
x402
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