# USDD Docs

## USDD Docs

- [USDD Intro](https://legacy-docs.usdd.io/usdd-intro.md)
- [USDD WhitePaper](https://legacy-docs.usdd.io/usdd-whitepaper.md)
- [TDR(TRON DAO RESERVE)](https://legacy-docs.usdd.io/tdr/tdr-tron-dao-reserve.md)
- [USDD Issuance](https://legacy-docs.usdd.io/usdd-issuance/usdd-issuance.md)
- [Over-Collateralization and Transparency](https://legacy-docs.usdd.io/usdd-issuance/over-collateralization-and-transparency.md)
- [The PSM](https://legacy-docs.usdd.io/psm/the-psm.md)
- [How to swap between USDD and USDT/USDC/TUSD/USDJ at 1:1 ratio in PSM?](https://legacy-docs.usdd.io/psm/how-to-swap-between-usdd-and-usdt-usdc-tusd-usdj-at-1-1-ratio-in-psm.md)
- [PSM(TDR)](https://legacy-docs.usdd.io/psm/how-to-swap-between-usdd-and-usdt-usdc-tusd-usdj-at-1-1-ratio-in-psm/psm-tdr.md)
- [PSM(USDD)](https://legacy-docs.usdd.io/psm/how-to-swap-between-usdd-and-usdt-usdc-tusd-usdj-at-1-1-ratio-in-psm/psm-usdd.md)
- [PSM(SUN)](https://legacy-docs.usdd.io/psm/how-to-swap-between-usdd-and-usdt-usdc-tusd-usdj-at-1-1-ratio-in-psm/psm-sun.md)
- [Audit Report](https://legacy-docs.usdd.io/security/audit-report.md)
- [Announcements](https://legacy-docs.usdd.io/news-center/announcements.md)
- [Announcement on Re-opening the Channel for USDC to Issue USDD in PSM](https://legacy-docs.usdd.io/news-center/announcements/announcement-on-re-opening-the-channel-for-usdc-to-issue-usdd-in-psm.md)
- [Announcement on Suspending the Channel for USDC to Issue USDD in PSM](https://legacy-docs.usdd.io/news-center/announcements/announcement-on-suspending-the-channel-for-usdc-to-issue-usdd-in-psm.md)
- [Announcement on Upgrading PSM to Support USDJ](https://legacy-docs.usdd.io/news-center/announcements/announcement-on-upgrading-psm-to-support-usdj.md)
- [Announcement on Upgrading PSM to Support TUSD](https://legacy-docs.usdd.io/news-center/announcements/announcement-on-upgrading-psm-to-support-tusd.md)
- [Announcement on Upgrading PSM to Support USDC](https://legacy-docs.usdd.io/news-center/announcements/announcement-on-upgrading-psm-to-support-usdc.md)
- [What monetary policies will the TDR adopt to maintain the value of USDD?](https://legacy-docs.usdd.io/faq/what-monetary-policies-will-the-tdr-adopt-to-maintain-the-value-of-usdd.md)