Stablecoin Depeg Monitor — Peg Deviation Alerts

Know the moment a stablecoin slips its peg. Watch a basket of stablecoins and each run reads keyless public prices, measures the deviation from $1.00, classifies the peg state, and — because it remembers the previous run — alerts when a coin crosses into a worse state or beyond your threshold. Anything off-peg is cross-checked on a second source so a single bad print doesn't cry wolf. Schedule it + set a webhook for a standing depeg alarm. Read-only, keyless, agent-callable.

For treasuries, funds, DeFi users, risk/ops, and AI agents that need a de-peg trigger.

Factual price observations, not financial advice.

What it does

• Reads prices for your stablecoins (keyless CoinGecko) in one call, with 24h change.
• Measures pegDeviationPct = (price − 1) × 100 and classifies: on-peg → minor-deviation → depeg-warning → depeg → severe-depeg.
• Cross-checks anything off-peg against Coinbase spot (a second independent source) before alerting.
• Diffs vs the previous run (named KV store) and alerts only when a coin worsens or breaks your threshold. First run = silent baseline.

Field	Meaning
priceUsd, pegDeviationPct, change24hPct	current price, distance from peg, 24h move
pegState	on-peg / minor-deviation / depeg-warning / depeg / severe-depeg
coinbasePriceUsd, crossConfirmed	second-source check (when off peg)
signal	baseline / on-peg / … / depeg-alert

Why not just ask an AI agent?

An agent has no memory and no scheduler, and would trust a single price feed. This keeps per-coin state across runs, measures deviation consistently, and confirms a depeg on a second exchange before alerting — so you get a reliable trigger, not a false alarm off one wick.

Input

Field	Type	Default	Description
stablecoins	array	USDT, USDC, DAI, FDUSD, PYUSD, FRAX, USDE	Symbols or CoinGecko ids.
depegThresholdPct	number	1.0	Alert at ≥ this % from $1.
webhookUrl	string		POST depeg alerts here.

Example input

{ "stablecoins": ["USDT", "USDC", "DAI", "FDUSD", "PYUSD"], "depegThresholdPct": 1.0 }

Output

One record per stablecoin. Example (real run, on-peg):

{
  "stablecoin": "USDT",
  "signal": "on-peg",
  "priceUsd": 0.998865,
  "pegDeviationPct": -0.1135,
  "change24hPct": -0.03,
  "pegState": "on-peg"
}

When a coin breaks peg: signal: "depeg-alert", pegState: "depeg" (or severe-depeg), with coinbasePriceUsd + crossConfirmed and the previousState it moved from.

Alerts / scheduling

1. Set stablecoins, depegThresholdPct and webhookUrl.
2. Schedule the actor (e.g. every 2–10 min).
3. First run is a silent baseline; after that, any coin that worsens past your threshold (and confirms on a second source) is POSTed to Slack/Discord/email via Make/Zapier.

Ready-made tasks

• Stablecoin Depeg Alert - USDT, USDC, DAI

For AI agents / MCP

https://mcp.apify.com/?tools=actors,docs,centorprat/stablecoin-depeg-monitor

Loads as centorprat--stablecoin-depeg-monitor. Claude Code:

claude mcp add apify -- npx -y @apify/actors-mcp-server --actors centorprat/stablecoin-depeg-monitor

FAQ

Which stablecoins? Any on CoinGecko — pass symbols (USDT, USDC, DAI, FDUSD, PYUSD, TUSD, FRAX, USDE, …) or CoinGecko ids.

How does it avoid false alarms? Anything off-peg is re-checked on Coinbase spot; an alert needs the second source to agree (when available).

Does it need a key? No — keyless public price APIs.

Does the first run alert? No — it's a silent baseline.

Cost? Pay-per-event: a base per run + a premium per depeg alert. Quiet runs cost only the base.

Data & attribution

Public price data via the keyless CoinGecko API, cross-checked against Coinbase spot. No keys, no personal data. Factual observations, not financial advice.

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