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Stablecoin Peg Stability Score: Which Coin Holds $1.00 Most Reliably?

As of Apr 2026, USDC leads all tracked stablecoins with a 30-day peg stability score of 99.3/100, reflecting near-zero deviation from its $1.00 target. SYRUPUSDC scores lowest at 0.0/100. The Peg Stability Score measures rolling 30-day mean absolute price deviation from $1.00, penalising any day where deviation exceeds 0.5 cents — the threshold institutional risk managers use to flag settlement risk. 12 stablecoins tracked across 365 daily snapshots from Apr 2025 to present. A sustained score below 90 warrants closer review of reserve composition and redemption pressure alongside price history.

Most Stable (30D)
USDC
99.3/100
Least Stable (30D)
SYRUPUSDC
0.0/100
Depeg Events (30D)
91
across all coins
Coins Tracked
12
with price history

Peg Stability Rankings

Current 30-day stability score per coin (0–100). Higher is better. Scores always reflect the most recent 30-day window and do not change with the date toggle.

Price Deviation from $1.00 — Top 5 Coins

Absolute distance from $1.00 per day (%). The dashed line marks the 0.5% depeg threshold. React to date toggle.

Market-Wide Peg Stress

Highest single-coin price deviation from $1.00 each day across all tracked stablecoins. Spikes indicate market-wide stress events. React to date toggle.

How to Read the Score

90–100 · Institutional Grade

Mean deviation <0.02% from $1.00, zero or near-zero depeg events in 30 days. Suitable for enterprise treasury, cross-border settlement, and regulated payment use cases.

70–90 · Acceptable Variance

Occasional micro-deviations or isolated depeg events. Normal for smaller-cap coins or algorithmic designs. Requires monitoring for treasury use but acceptable for DeFi collateral.

<70 · Elevated Risk

Persistent deviation from $1.00 or multiple depeg events in the window. Do not use in payment rails or as dollar-equivalent collateral without additional risk controls.

Methodology

Formula: Score = max(0, min(100, 100 − mean_abs_deviation × 5,000 − depeg_events × 2))

Depeg event: any day where |price − $1.00| > $0.005 (0.5 cents). Threshold aligns with institutional settlement risk standards.

Window: rolling 30-day. Minimum 7 days of price data required to compute a score.

Data source: CoinGecko API — daily closing price per coin. Prices reflect the end-of-day CoinGecko aggregated price across tracked exchanges.

Known limitation: CoinGecko prices are exchange-aggregated averages. Intraday depegs that recover by close of day are underweighted. For real-time depeg surveillance, on-chain oracle prices provide finer granularity.

Update frequency: Daily at 15:20 UTC.

Frequently Asked Questions

Which stablecoin has the most stable peg?
As of Apr 2026, USDC leads with a 30-day peg stability score of 99.3/100. The score reflects rolling mean absolute price deviation from $1.00 and the number of days where deviation exceeded 0.5 cents.
What counts as a stablecoin depeg event?
A depeg event is any day where a coin's CoinGecko aggregated price deviates more than $0.005 (0.5%) from $1.00. This threshold matches institutional risk management standards for payment stablecoins. Minor intraday fluctuations that remain within the band do not count.
How is the Peg Stability Score calculated?
Score = max(0, min(100, 100 − mean_abs_deviation × 5,000 − depeg_events × 2)). A coin pricing at exactly $1.00 every day scores 100. Each 0.01% of average daily deviation deducts 0.5 points; each depeg event deducts 2 additional points.
Why do USDT and USDC trade slightly below $1.00?
Both coins routinely trade between $0.9997 and $1.0003. This micro-deviation is normal: it reflects bid-ask spreads on exchanges, arbitrage routing between CEX and DEX markets, and minor settlement latency. It does not signal redemption risk unless sustained below $0.995.
Is a high peg stability score sufficient to assess stablecoin safety?
No. Peg stability measures price consistency, not solvency or reserve quality. A stablecoin can maintain a $1.00 price temporarily even during reserve stress — as seen in the early phase of the UST depeg in May 2022. Always assess peg stability alongside reserve composition, issuer concentration risk, and redemption pressure data.