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INDICATOR · USD-PEGGED ONLY

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

· Updated daily at 15:20 UTC

As of May 2026, RLUSD leads all tracked USD-pegged stablecoins with a 30-day peg stability score of 99.9/100. USDF scores lowest at 93.1/100. 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. 16 USD-pegged stablecoins tracked. Updated daily.

Most Stable (30D)
RLUSD
99.9/100
Least Stable (30D)
USDF
93.1/100
Market Stress Index
99.0/100
Low mcap-weighted
Downside Events (30D)
1
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 May 2026, RLUSD leads with a 30-day peg stability score of 99.9/100. 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.