diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..2cdefe3
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2025 Hypercerts Foundation
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
diff --git a/README.md b/README.md
index c3ca0ec..e73799d 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,17 @@
-# Hypercerts Periphery Contracts
+# Hypercerts periphery contracts (archived)
+
+> [!IMPORTANT]
+> This repository is archived and no longer maintained. Its contract, BatchTransferFraction, stays deployed on the chains listed under [Deployments](#deployments) and still works with hypercerts minted on Hypercerts v1. The repository stays public as the record of the contract's source and addresses.
+
+- Hypercerts has reached v2, and the v1 app has been retired. See [hypercerts.org/v1-retired](https://hypercerts.org/v1-retired).
+- For Hypercerts v2, see [hypercerts.org](https://hypercerts.org) and the [documentation](https://docs.hypercerts.org).
 
 [![TEST](https://github.com/hypercerts-org/protocol-periphery/actions/workflows/test.yml/badge.svg)](https://github.com/hypercerts-org/protocol-periphery/actions/workflows/test.yml)
 [![Slither Analysis](https://github.com/hypercerts-org/protocol-periphery/actions/workflows/slither.yaml/badge.svg)](https://github.com/hypercerts-org/protocol-periphery/actions/workflows/slither.yaml)
 
 ## Table of Contents
 
-- [Hypercerts Periphery Contracts](#hypercerts-periphery-contracts)
+- [Hypercerts periphery contracts (archived)](#hypercerts-periphery-contracts-archived)
 	- [Table of Contents](#table-of-contents)
 	- [BatchTransferFraction](#batchtransferfraction)
 		- [Implementation](#implementation)
@@ -124,3 +130,7 @@ end
 | Base             | 8453     | [0xc4aEB039BC432343bf4dB57Be203E0540d385a18](https://basescan.org/address/0xc4aEB039BC432343bf4dB57Be203E0540d385a18)            |
 | Arbitrum         | 42161    | [0x8b973c408c2748588b3ECFfDA06D670819FbEb1D](https://arbiscan.io/address/0x8b973c408c2748588b3ECFfDA06D670819FbEb1D)             |
 | Celo             | 42220    | [0xB64B7e4793D72958e028B1D5D556888b115c4c3E](https://celoscan.io/address/0xB64B7e4793D72958e028B1D5D556888b115c4c3E)             |
+
+## License
+
+[MIT](LICENSE), as the `SPDX-License-Identifier` in each source file says.