> For the complete documentation index, see [llms.txt](https://docs.secured.finance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.secured.finance/usdfc-stablecoin/deployed-contracts.md).

# Contracts and Security

Deployed contract addresses, token standards, and audit reports

## Contract addresses

The latest version of [`@secured-finance/stablecoin-contracts`](https://github.com/Secured-Finance/stablecoin-contracts) is deployed at the addresses below. **Always verify addresses against this page before interacting with the contracts directly.**

### USDFC token

| Network                      | Address                                                                                                                               |
| ---------------------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
| Filecoin Mainnet             | [`0x80B98d3aa09ffff255c3ba4A241111Ff1262F045`](https://filfox.info/en/address/0x80B98d3aa09ffff255c3ba4A241111Ff1262F045)             |
| Filecoin Calibration Testnet | [`0xb3042734b608a1B16e9e86B374A3f3e389B4cDf0`](https://calibration.filfox.info/en/address/0xb3042734b608a1B16e9e86B374A3f3e389B4cDf0) |

Past upgrades are recorded in [Contract Upgrade History](/usdfc-stablecoin/deployed-contracts/contract-upgrade-history.md).

### Protocol contracts (Filecoin Mainnet)

| Contract              | Role                                                                                                                                                                                     | Address                                                                                                                   |
| --------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------- |
| BorrowerOperations    | Opening, adjusting, and closing Troves                                                                                                                                                   | [`0x1dE3c2e21DD5AF7e5109D2502D0d570D57A1abb0`](https://filfox.info/en/address/0x1dE3c2e21DD5AF7e5109D2502D0d570D57A1abb0) |
| TroveManager          | Liquidations, redemptions, Trove state                                                                                                                                                   | [`0x5aB87c2398454125Dd424425e39c8909bBE16022`](https://filfox.info/en/address/0x5aB87c2398454125Dd424425e39c8909bBE16022) |
| StabilityPool         | Stability Pool deposits and gains                                                                                                                                                        | [`0x791Ad78bBc58324089D3E0A8689E7D045B9592b5`](https://filfox.info/en/address/0x791Ad78bBc58324089D3E0A8689E7D045B9592b5) |
| PriceFeed             | FIL/USD price with fallback logic                                                                                                                                                        | [`0x80e651c9739C1ed15A267c11b85361780164A368`](https://filfox.info/en/address/0x80e651c9739C1ed15A267c11b85361780164A368) |
| RedStone FIL/USD feed | Primary oracle (Chainlink-compatible aggregator operated by [RedStone](https://app.redstone.finance/push-feeds/FIL/filecoinMultiFeed))                                                   | [`0x434F8D17c0301cfEa143dba912972E24B827C968`](https://filfox.info/en/address/0x434F8D17c0301cfEa143dba912972E24B827C968) |
| TellorCaller          | Fallback oracle adapter                                                                                                                                                                  | [`0x3eA890431C85F40405BBF5BE74D03802672aFe3b`](https://filfox.info/en/address/0x3eA890431C85F40405BBF5BE74D03802672aFe3b) |
| ActivePool            | Collateral and debt of active Troves                                                                                                                                                     | [`0x8637Ac7FdBB4c763B72e26504aFb659df71c7803`](https://filfox.info/en/address/0x8637Ac7FdBB4c763B72e26504aFb659df71c7803) |
| DefaultPool           | Redistributed collateral and debt                                                                                                                                                        | [`0xAda716f497da8EC9F766F9a94779E1b6e73d29fF`](https://filfox.info/en/address/0xAda716f497da8EC9F766F9a94779E1b6e73d29fF) |
| CollSurplusPool       | Claimable collateral surpluses from liquidations                                                                                                                                         | [`0x212799bEA5c2ed87D84b9Ae3C1Fb0fdc1bFC7AE9`](https://filfox.info/en/address/0x212799bEA5c2ed87D84b9Ae3C1Fb0fdc1bFC7AE9) |
| GasPool               | Holds Liquidation Reserves                                                                                                                                                               | [`0xbd73175383ac35b2BfdD89377D9D8BDC11dA1bF8`](https://filfox.info/en/address/0xbd73175383ac35b2BfdD89377D9D8BDC11dA1bF8) |
| SortedTroves          | Troves ordered by collateral ratio                                                                                                                                                       | [`0x2C32e48e358d5b893C46906b69044D342d8DDd5F`](https://filfox.info/en/address/0x2C32e48e358d5b893C46906b69044D342d8DDd5F) |
| HintHelpers           | Gas-efficient operation hints                                                                                                                                                            | [`0xf06A4eBa3B9e45533566a31DA2F213bc44E89E60`](https://filfox.info/en/address/0xf06A4eBa3B9e45533566a31DA2F213bc44E89E60) |
| MultiTroveGetter      | Batch Trove queries                                                                                                                                                                      | [`0x5065b1F44fEF55Df7FD91275Fcc2D7567F8bf98F`](https://filfox.info/en/address/0x5065b1F44fEF55Df7FD91275Fcc2D7567F8bf98F) |
| ProtocolTokenStaking  | Fee Reserve — receives protocol fees; unallocated fees are withdrawable by the contract owner (see [Protocol Fees](/usdfc-stablecoin/core-mechanics/protocol-fees.md#where-the-fees-go)) | [`0xc8707b3d426E7D7A0706C48dcd1A4b83bc220dB3`](https://filfox.info/en/address/0xc8707b3d426E7D7A0706C48dcd1A4b83bc220dB3) |

Testnet addresses for every contract are in the repository's [`deployments/outputs`](https://github.com/Secured-Finance/stablecoin-contracts/tree/develop/deployments/outputs).

## Token standards

USDFC implements:

* **ERC-20** — the standard token interface.
* **EIP-2612 (`permit`)** — signature-based allowances, so granting an approval doesn't require its own transaction (a `transferFrom` still moves the tokens).
* **EIP-3009 (`transferWithAuthorization` / `receiveWithAuthorization`)** — signature-authorized transfers. `transferWithAuthorization` can be submitted by anyone (who pays the gas); `receiveWithAuthorization` must be submitted by the recipient. Together they enable gasless transfers and **x402** payment flows.

EIP-2612 and EIP-3009 support was added by a contract upgrade in September 2025 (the token address did not change) and audited by Hexens in August 2025 — the third report below.

## Audit reports

| Auditor  | Date                   | Scope                             | Report                                                                                                                  |
| -------- | ---------------------- | --------------------------------- | ----------------------------------------------------------------------------------------------------------------------- |
| Hexens   | 2024/12/30 – 2025/1/20 | Core protocol                     | [2025-1-Hexens.pdf](https://github.com/Secured-Finance/stablecoin-contracts/blob/develop/audits/2025-01-Hexens.pdf)     |
| Decurity | 2025/2/19 – 2025/3/5   | Core protocol                     | [2025-3-Decurity.pdf](https://github.com/Secured-Finance/stablecoin-contracts/blob/develop/audits/2025-03-Decurity.pdf) |
| Hexens   | 2025/8/20 – 2025/8/28  | EIP-3009 / EIP-2612 token upgrade | [2025-8-Hexens.pdf](https://github.com/Secured-Finance/stablecoin-contracts/blob/develop/audits/2025-08-Hexens.pdf)     |

## Stress test

[Stress-Testing Simulation and Risk Assessment](https://medium.com/cryptoeconlab/stress-testing-usdfc-8b068d13a1cf) by the CryptoEconLab team:

{% file src="/files/hLNKkRx5HSezFDhnKADW" %}

{% hint style="warning" %}
Audits reduce risk but never eliminate it. The price feed's Tellor fallback also currently depends on an update job operated by Secured Finance (the primary RedStone feed does not) — see [Price Oracle](/usdfc-stablecoin/core-mechanics/price-oracle.md) for the trust assumptions.
{% endhint %}