diff --git a/tycho/README.md b/tycho/README.md
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diff --git a/tycho/requirements.txt b/tycho/requirements.txt
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diff --git a/tycho/tycho/__init__.py b/tycho/tycho/__init__.py
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diff --git a/tycho/tycho/constants.py b/tycho/tycho/constants.py
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+++ b/tycho/tycho/constants.py
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+from pathlib import Path
+from typing import Final
+
+TYCHO_CLIENT_FOLDER = Path(__file__) / "bins"
+TYCHO_CLIENT_LOG_FOLDER = TYCHO_CLIENT_FOLDER / "logs"
+
+EXTERNAL_ACCOUNT: Final[str] = "0xf847a638E44186F3287ee9F8cAF73FF4d4B80784"
+"""This is a dummy address used as a transaction sender"""
+UINT256_MAX: Final[int] = 2 ** 256 - 1
+MAX_BALANCE: Final[int] = UINT256_MAX // 2
+"""0.5 of the maximal possible balance to avoid overflow errors"""
diff --git a/tycho/tycho/decoders.py b/tycho/tycho/decoders.py
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+++ b/tycho/tycho/decoders.py
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+from tycho.tycho.models import EVMBlock
+
+
+class ThirdPartyPoolTychoDecoder:
+    """ThirdPartyPool decoder for protocol messages from the Tycho feed"""
+
+    def decode_snapshot(self, message, block: EVMBlock):
+        """Decode a message from the Tycho feed"""
+        pass
diff --git a/tycho/tycho/exceptions.py b/tycho/tycho/exceptions.py
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diff --git a/tycho/tycho/models.py b/tycho/tycho/models.py
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+++ b/tycho/tycho/models.py
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+import datetime
+from enum import Enum
+from pydantic import BaseModel, Field
+
+
+class Blockchain(Enum):
+    ethereum = "ethereum"
+    arbitrum = "arbitrum"
+    polygon = "polygon"
+    zksync = "zksync"
+
+
+class EVMBlock(BaseModel):
+    id: int
+    ts: datetime.datetime = Field(default_factory=datetime.datetime.utcnow)
+    hash_: str
+
+
+class ThirdPartyPool:
+    pass