Crypto Gloss

Anchor Protocol

Anchor Protocol (ANC) was a decentralized savings and money market protocol on the Terra blockchain that launched on March 17, 2021, and offered depositors approximately 20% annual percentage yield on UST (TerraUSD), positioning itself as “the gold standard for passive income in crypto.” This fixed-rate yield — orders of magnitude above traditional savings accounts — became the primary driver of UST demand and one of the central mechanisms sustaining the Terra/LUNA/UST ecosystem. ANC was the governance token, used to vote on yield reserve management and protocol parameters. Anchor Protocol became non-operational in May 2022 when the Terra ecosystem collapsed.

via ChangeNow · T&CsPrice data from CoinGecko as of 2026-04-21. Not financial advice.

How It Works

  1. Deposits (Earn) — Users deposit UST into Anchor and receive aUST (interest-bearing UST). The ~20% APY was subsidized from a yield reserve fund.
  2. Borrowing (Borrow) — Borrowers post “bonded” collateral (bLUNA or bETH — staked derivatives of LUNA and ETH respectively) and borrow UST against it at ~12–15% APR. The staking yield from the collateral (bLUNA staking rewards ~7%, bETH via Lido staking rewards ~4–5%) flowed into the yield reserve.
  3. Yield reserve — The gap between what borrowers paid in interest vs. what depositors received was filled by the Yield Reserve, initially seeded by Terraform Labs with hundreds of millions of dollars. When the reserve was being drained faster than replenished, interest rate adjustments were proposed.
  4. ANC token — Borrowers received ANC token incentives that subsidized the cost of borrowing, making borrowing attractive even at above-market rates. This incentive loop was central to Anchor’s flywheel.
  5. Liquidations — Under-collateralized borrow positions could be liquidated via an on-chain liquidation queue.

Tokenomics

Parameter Value
Ticker ANC
Chain Terra (defunct)
Max Supply 1,000,000,000 (1 billion)
Launch March 17, 2021
Release Schedule 4-year linear vesting (team, investors) + borrower incentives + LP rewards

Use Cases

  • Earn 20% APY on UST — The primary use case. Became the largest single-asset yield deployment in all DeFi at Anchor’s peak.
  • Borrow UST — Post bLUNA/bETH collateral and borrow UST.
  • Governance — ANC holders voted on yield parameter adjustments and reserve management.
  • Liquidity provision — Provide liquidity in ANC-UST Terraswap pools.

History

  • 2021-03-17 — Anchor Protocol launches on Terra mainnet. Do Kwon (Terraform Labs CEO) is the driving force. The 20% APY on UST is immediately controversial — many economists and DeFi analysts publicly question the sustainability of this rate.
  • 2021 — Explosive growth. Anchor becomes the primary reason retail investors hold UST. “20% on stablecoins” becomes a major marketing line for Terra. Billions flow in. ANC token reaches high valuations.
  • 2022-01 — Yield reserve begins draining rapidly. Deposits far exceed borrowing demand. The reserve was reportedly dropping ~$5M–$10M per day at times. Terraform Labs injects $450 million into the yield reserve in February 2022 to sustain the 20% rate.
  • 2022-03 — A governance proposal changes the fixed 20% yield to a “semi-dynamic” rate with a gradually declining floor. The floor remains near 19.5%, doing little to stem withdrawals or the reserve drain.
  • 2022-05-07 — Large UST withdrawals from Curve Finance’s 3pool begin destabilizing UST’s peg. The Luna Foundation Guard (LFG) deploys its Bitcoin reserve to defend the peg.
  • 2022-05-09–12 — UST peg collapses catastrophically. LUNA hyperinflates to near zero. Mass panic withdrawals from Anchor liquidate aUST at declining rates as UST depegs. Anchor effectively becomes insolvent as UST — the asset deposited — is no longer worth $1. Over $14 billion in UST from Anchor’s TVL evaporates.
  • 2022-05-27 — Terra chain halted (multiple times). Anchor Protocol ceases operations. ANC token becomes essentially worthless.
  • 2023 — Terra 2.0 (new LUNA chain) exists but Anchor is not rebuilt. Do Kwon arrested in Montenegro in March 2023. SEC charges Terraform Labs with securities fraud, specifically citing the Anchor 20% yield as a key component of fraud.

Common Misconceptions

“The 20% yield was sustainable long-term.”

The yield was explicitly subsidized from a reserve funded by Terraform Labs, not from organic protocol revenue. Multiple analysts, including prominent voices like Kevin Zhou (Galois Capital) and Sensei Algod, publicly warned this was unsustainable. The reserve was draining rapidly in early 2022, requiring emergency injections. It was a recruitment mechanism for UST adoption, not a mathematically stable yield model.

“Anchor failed because of a hack or exploit.”

Anchor had no technical exploit. Its failure was the direct consequence of UST losing its dollar peg — when UST collapsed, the asset Anchor was denominated in became worthless. The “attack” was an algorithmic bank run on UST triggered by large withdrawals from Curve, combined with a death spiral in the LUNA-UST mint/burn mechanism.

“Anchor was a Ponzi scheme.”

Whether Anchor constitutes fraud is a legal and definitional question now being adjudicated in US courts. What is clear is that the yield was structurally dependent on continuous capital injection (the reserve), borrowed demand that the ANC incentives created, and the broader Terra ecosystem growth — all of which halted when UST depegged.

Social Media Sentiment

  • r/CryptoCurrency / r/terraluna: Anchor is consistently cited as a textbook warning about unsustainable DeFi yields; posts referencing the 20% APY are used as red flag examples. Many retail investors documented life savings lost.
  • X/Twitter: One of the most analyzed DeFi collapses in crypto history. The protocol’s failure is central to ongoing discussions about algorithmic stablecoins, Do Kwon’s arrest, and the SEC’s case against Terraform Labs.
  • Discord (Terra community): The original community dispersed after the collapse; successor discussions occur on Terra 2.0 channels, though Anchor was not rebuilt.

Last updated: 2026-04

Related Terms

See Also

  • Do Kwon — CEO of Terraform Labs and driving force behind Anchor’s 20% yield design
  • Three Arrows Capital — major fund that collapsed following the Terra/Anchor failure
  • FTX — exchange that subsequently collapsed in part due to crypto contagion from Terra
  • Lido — provider of bETH collateral used in Anchor’s borrow market

Sources