feat: add 4pool

.github/workflows/4pool.yaml

@@ -0,0 +1,59 @@
+name: 4pool
+
+on:
+  pull_request:
+    paths:
+    - 'tests/**/*.py'
+    - 'contracts/pools/4pool/**.vy'
+  push:
+    paths:
+    - 'tests/**/*.py'
+    - 'contracts/pools/4pool/**.vy'
+
+
+env:
+  pool: '4pool'
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  NODE_OPTIONS: --max_old_space_size=4096
+
+
+jobs:
+
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        target: [pools, zaps]
+        type: [unitary, integration]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Cache Compiler Installations
+      uses: actions/cache@v2
+      with:
+        path: |
+          ~/.solcx
+          ~/.vvm
+        key: compiler-cache
+
+    - name: Setup Node.js
+      uses: actions/setup-node@v1
+
+    - name: Install Ganache
+      run: npm install
+
+    - name: Setup Python 3.8
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+
+    - name: Install Requirements
+      run: |
+        pip install wheel
+        pip install -r requirements.txt
+
+    - name: Run Tests
+      run: brownie test tests/${{ matrix.target }} --pool ${{ env.pool }} --${{ matrix.type }}

contracts/pools/4pool/README.md

@@ -0,0 +1,17 @@
+# curve-contract/contracts/pools/4pool
+
+## Contracts
+
+* [`StableSwap4Pool`](StableSwap4Pool.vy): Curve stablecoin AMM contract
+
+## Deployments
+TBD
+
+## Stablecoins
+
+Curve four-pool supports swaps between the following stablecoins:
+
+* `FRAX`: [0x853d955aCEf822Db058eb8505911ED77F175b99e](https://etherscan.io/token/0x853d955aCEf822Db058eb8505911ED77F175b99e)
+* `USDC`: [0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48](https://etherscan.io/token/0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48)
+* `UST`: [0xa693B19d2931d498c5B318dF961919BB4aee87a5](https://etherscan.io/token/0xa693B19d2931d498c5B318dF961919BB4aee87a5)
+* `USDT`: [0xdac17f958d2ee523a2206206994597c13d831ec7](https://etherscan.io/address/0xdac17f958d2ee523a2206206994597c13d831ec7)