Pirex rate provider

contracts/providers/PirexRateProvider.vy

@@ -0,0 +1,12 @@
+# @version 0.3.7
+
+from vyper.interfaces import ERC4626
+
+ASSET: constant(address) = 0x9Ba021B0a9b958B5E75cE9f6dff97C7eE52cb3E6 # apxETH
+UNIT: constant(uint256) = 1_000_000_000_000_000_000
+
+@external
+@view
+def rate(_asset: address) -> uint256:
+    assert _asset == ASSET
+    return ERC4626(ASSET).convertToAssets(UNIT)

scripts/rate_provider_gas.py

@@ -14,7 +14,8 @@ def main():
         # project.TranchessRateProvider,
         project.MetaPoolRateProvider,
         project.RocketPoolRateProvider,
-        project.MevProtocolRateProvider
+        project.MevProtocolRateProvider,
+        project.PirexRateProvider,
     ]
 
     assets = [
@@ -29,6 +30,7 @@ def main():
         '0x48AFbBd342F64EF8a9Ab1C143719b63C2AD81710', # mpETH
         '0xae78736Cd615f374D3085123A210448E74Fc6393', # rETH
         '0x24Ae2dA0f361AA4BE46b48EB19C91e02c5e4f27E', # mevETH
+        '0x9Ba021B0a9b958B5E75cE9f6dff97C7eE52cb3E6' # apxETH
     ]
 
     measure = project.RateProviderMeasure.deploy(sender=deployer)

tests/test_pirex_rate_provider.py

@@ -0,0 +1,20 @@
+from ape import Contract
+import pytest
+
+ASSET = '0x9Ba021B0a9b958B5E75cE9f6dff97C7eE52cb3E6'
+UNDERLYING = '0x04C154b66CB340F3Ae24111CC767e0184Ed00Cc6'
+UNIT = 1_000_000_000_000_000_000
+
+@pytest.fixture
+def provider(project, deployer):
+    return project.PirexRateProvider.deploy(sender=deployer)
+
+def test_rate_provider(provider, accounts):
+    asset = Contract(ASSET)
+    account = accounts['0x3A8EAF3fE0082e478293917F2E81F4fEED97ace2']
+    underlying = Contract(UNDERLYING)
+    asset.redeem(UNIT, accounts[0], account, sender=account)
+
+    rate = provider.rate(ASSET)
+    assert rate > UNIT and rate < UNIT * 12 // 10
+    assert underlying.balanceOf(accounts[0]) == rate