Weekly Monthly Insights Charts Tracker Companies Networks Glossary
INDICATOR · USD-PEGGED ONLY

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

· Updated daily at 15:20 UTC

As of Jul 2026, RLUSD leads all tracked USD-pegged stablecoins with a 30-day peg stability score of 99.3/100. FRAX scores lowest at 24.6/100. The score measures rolling 30-day mean absolute price deviation from $1.00 using daily high/low data, capturing intraday depegs that closing prices miss. Depeg events are split by direction, downside (<$0.995) signals redemption pressure; upside (>$1.005) typically reflects demand surge or minting lag, not credit risk. 19 USD-pegged stablecoins tracked. Updated daily.

Most Stable (30D)
RLUSD
99.3/100
Least Stable (30D)
FRAX
24.6/100
Market Stress Index
97.9/100
Low mcap-weighted
Downside Events (30D)
59
days below $0.995
Upside Events (30D)
0
days above $1.005

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 × 2,000 − depeg_events × 2))

Depeg event: any day where the intraday high/low deviation from $1.00 exceeds $0.005 (0.5%). Events are separately classified as downside (low < $0.995, redemption pressure signal) or upside (high > $1.005, demand/minting lag signal). Both directions enter the score equally; the stat boxes show them split for interpretation.

Price data: CoinGecko OHLC API, daily open/high/low/close for top 30 USD-pegged stablecoins. High/low capture intraday depegs that closing-price-only metrics miss. Direction (up/down) is determined from the daily closing price.

Window: rolling 30-day. Minimum 7 days of data required.

Multiplier calibration: 2,000 (vs common 5,000) is chosen because OHLC intraday ranges are inherently wider than end-of-day prices, using a lower multiplier prevents normal market microstructure noise from overly penalising otherwise stable coins.

Update frequency: Daily at 15:20 UTC.

Frequently Asked Questions

Which stablecoin has the most stable peg?
As of Jul 2026, RLUSD 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 × 2,000 − depeg_events × 2)). A coin pricing at exactly $1.00 every day scores 100. Each 0.05% of average daily deviation deducts 1 point; 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.