Upgrade frequency (per 90 days)

USDD (Decentralized USD)'s assessment for RD-F-137 — scored yellow on the v1.7.0 rubric. The evidence below is the curator's reasoning for this score.

Evidence summary #

Multiple major contract deployments in last 12 months: USDD 2.0 on TRON (Jan 2025), USDD native Ethereum ERC-20 and PSM (Sept 2025). These represent significant new attack surface introductions. No proxy upgrade mechanism (non-upgradeable architecture) so no Upgraded events to count, but the redeploy/new-deploy pattern shows high cadence.

Sources #

URL
USDD 2.0: From Tron to Ethereum and Beyond | MediumMedium — USDD 2.0 from Tron to Ethereum and Beyond (Ethereum Sept 2025)retrieved 2026-05-17
URL
USDD 2.0 on TRON Chain officially launched — ChainCatcherChaincatcher — USDD 2.0 on TRON Chain officially launched (Jan 2025)retrieved 2026-05-17

Methodology #

Count the number of contract upgrades in the trailing 90 days via on-chain upgrade events.

See the full factor methodology and distribution across all protocols →

rubric_version v1.7.0 protocol usdd factor RD-F-137 score yellow collected_at 2026-05-17 11:34:18