---

name: more-vaults description: Add more vault smart contract types to an existing protocol

Add more vaults to protocol

This skill guides you through adding more smart contract types to the existing vaults.

Required inputs

Before starting, gather the following information from the user:

1. Vault protocol name: The exiting vault protocol in the codebase
2. Vault class name: What is the Python class name we use for this vault smart contract type
3. Vault smart contract address - The address of an example vault contract on a blockchain
4. Chain - Which blockchain (Ethereum, Arbitrum, Base, etc.)
5. Block explorer URL - To fetch the ABI (e.g., Etherscan, Arbiscan, Basescan)
6. Single vault protocol: Some protocols, especially ones issuing out their own stablecoin, are know to have only a single vault for the stablecoin staking. Example protocols are like like Spark, Ethena, Cap. In this case use HARDCODED_PROTOCOLS classification later, as there is no point to create complex vault smart contract detection patterns if the protocol does not need it.

Step-by-step implementation

Step 1: Download and store the ABI

1. Fetch the vault smart contract ABI from the blockchain explorer
2. Important: If the contract is a proxy, you need the implementation ABI, not the proxy ABI
   • Check if the contract has a implementation() function or similar
   • Use the explorer's "Read as Proxy" feature to get the implementation address
   • Download the implementation contract's ABI
3. Create the ABI directory and file:

   Copyeth_defi/abi/{protocol_slug}/
   eth_defi/abi/{protocol_slug}/{ContractName}.json
   

4. Use eth_defi/abi/lagoon/ as a reference for structure

Step 2: Create the vault class

Update the existing vault protocol Python module to contain a class definitions.

The vault class should be in a new module next to the existing module:

Copy"""Module docstring describing the protocol."""

import datetime
import logging

from eth_typing import BlockIdentifier

from eth_defi.erc_4626.vault import ERC4626Vault

logger = logging.getLogger(__name__)


class {VaultClassName}(ERC4626Vault):
    """Protocol vault support.

    Add few lines descriptiong of the protocol here, from the protocol documentation.

    - Add links to protocol documentation
    - Add links to example contracts on block explorers
    - Add links to github
    """

    def has_custom_fees(self) -> bool:
        """Whether this vault has deposit/withdrawal fees."""
        return False  # Adjust based on protocol

    def get_management_fee(self, block_identifier: BlockIdentifier) -> float:
        """Get the current management fee as a percent.

        :return:
            0.1 = 10%
        """
        # Implement based on protocol's fee structure
        # Generated: Human can add details later
        return None

    def get_performance_fee(self, block_identifier: BlockIdentifier) -> float | None:
        """Get the current performance fee as a percent.

        :return:
            0.1 = 10%
        """
        # Implement based on protocol's fee structure
        # Generated: Human can add details later
        return None

    def get_estimated_lock_up(self) -> datetime.timedelta | None:
        """Get estimated lock-up period if any."""
        return None

    def get_link(self, referral: str | None = None) -> str:
        """Get the vault's web UI link."""
        return f"https://protocol-url.com/vault/{self.vault_address}"

For get_link() check the protocol website to find a direct link URL pattern to its vault. Usual formats:

• By address
• By chain id and address - for example Ethereum chain id is 1
• By chain name and address - use get_chain_name(chain_id).lower() or simiar
• Can be special for protocols just with one vault, it can be a single link with no pattern
• If you fail to figure this out, just link to the protocol homepage

Step 3: Add protocol identification probes

Edit eth_defi/erc_4626/classification.py:

1. In create_probe_calls(), add a probe call that uniquely identifies this protocol:
   • Analyse the ABI and the vault implementation smart contract source code to find a function unique to this protocol
   • Look for functions like getProtocolSpecificData(), custom role constants, etc. and compare them to what is already implemented in create_probe_calls()
   • Make sure this call does not conflict with already configured protocols
   • You can also use blockchain explorer's Contract > Read contract or Contract Read contract as proxy to figure out good ABI calls to detect this particular type of smart contracts
   • If the protocol is a single vault protocol, use HARDCODED_PROTOCOLS in classification.py instead

If you cannot find a such accessor function in the ABI or vault smart contract source, interrupt the skill and ask for user intervention.

Copy# {Protocol Name}
# {Block explorer link}
{protocol_slug}_call = EncodedCall.from_keccak_signature(
    address=address,
    signature=Web3.keccak(text="uniqueFunction()")[0:4],
    function="uniqueFunction",
    data=b"",
    extra_data=None,
)
yield {protocol_slug}_call

1. In identify_vault_features(), add detection logic:

Copyif calls["uniqueFunction"].success:
    features.add(ERC4626Feature.{protocol_slug}_like)

Step 5: Update create_vault_instance()

In eth_defi/erc_4626/classification.py, add a case for the new protocol in create_vault_instance():

Copyelif ERC4626Feature.{protocol_slug}_like in features:
    from eth_defi.erc_4626.vault_protocol.{protocol_slug}.vault import {ProtocolName}Vault

    return {ProtocolName}Vault(web3, spec, token_cache=token_cache, features=features)

Step 5: Update test file

Update tests/erc_4626/vault_protocol/test_{protocol_slug}.py following the pattern in tests/erc_4626/vault_protocol/test_plutus.py and. tests/erc_4626/vault_protocol/test_goat.py:

Copy"""Test {Protocol Name} vault metadata"""

import os
from pathlib import Path

import pytest
from web3 import Web3
import flaky

from eth_defi.erc_4626.classification import create_vault_instance_autodetect
from eth_defi.erc_4626.core import get_vault_protocol_name
from eth_defi.erc_4626.vault_protocol.{protocol_slug}.vault import {ProtocolName}Vault
from eth_defi.provider.anvil import fork_network_anvil, AnvilLaunch
from eth_defi.provider.multi_provider import create_multi_provider_web3
from eth_defi.vault.base import VaultTechnicalRisk
from eth_defi.erc_4626.core import ERC4626Feature

JSON_RPC_{CHAIN} = os.environ.get("JSON_RPC_{CHAIN}")

pytestmark = pytest.mark.skipif(
    JSON_RPC_{CHAIN} is None,
    reason="JSON_RPC_{CHAIN} needed to run these tests"
)


@pytest.fixture(scope="module")
def anvil_{chain}_fork(request) -> AnvilLaunch:
    """Fork at a specific block for reproducibility"""
    launch = fork_network_anvil(JSON_RPC_{CHAIN}, fork_block_number={block_number})
    try:
        yield launch
    finally:
        launch.close()


@pytest.fixture(scope="module")
def web3(anvil_{chain}_fork):
    web3 = create_multi_provider_web3(anvil_{chain}_fork.json_rpc_url)
    return web3


@flaky.flaky
def test_{protocol_slug}(
    web3: Web3,
    tmp_path: Path,
):
    """Read {Protocol Name} vault metadata"""

    vault = create_vault_instance_autodetect(
        web3,
        vault_address="{vault_address}",
    )

    assert isinstance(vault, {ProtocolName}Vault)
    assert vault.get_protocol_name() == "{Protocol Name}"

    # Add assertation about vault feature flags here, like:
    # assert vault.features == {ERC4626Feature.goat_like}

    # Add assertions for fee data we know
    # assert vault.get_management_fee("latest") == ...
    # assert vault.get_performance_fee("latest") == ...

    # Add assertion for the protcol risk level
    # assert vault.get_risk() == VaultTechnicalRisk.unknown

• Update the test file for a correct blockchain
• Use the blockchain explorer to get the latest block number and update it in fork_block_number.
• When you run the test and if the user does not have JSON-RPC configured for this chain, interrupt the skill and tell user to update his test environment variables

After adding it, run the test module and fix any issues.

Step 7: All vault protocol related tests

Rerun all tests for the vault protocl for which we added more vaults.

Step 8: Format the codebase

Format the newly added files with poetry run ruff format.

Step 9: Update documentation

In docs/source/vaults include the newly created module alongside the existing module.

Remember to update index.rst.

Step 10: Verification checklist

After implementation, verify:

• ABI file is correctly placed in eth_defi/abi/{protocol_slug}/
• Vault class inherits from ERC4626Vault
• ERC4626Feature enum has the new protocol
• get_vault_protocol_name() returns the correct name
• create_probe_calls() has a unique probe for the protocol
• identify_vault_features() correctly identifies the protocol
• create_vault_instance() creates the correct vault class
• Test file runs successfully with: source .local-test.env && poetry run pytest tests/erc_4626/vault_protocol/test_{protocol_slug}.py -v
• API documents have been updated
• Check that homepage link in the API documentation takes to the correct homepage
• Check that Twitter link in the API documentation works and takes to the same Twitter account as listed on the protocol homepage

If there are problems with the checklist, ask for human assistance.

Step 12: Changelog

• Update changelog line in CHANGELOG.md and add a note of added new protocol

Step 12: Pull request (optional)

After everything is done, open a pull request, but only if the user asks you to.

Copygh pr create \
  --title "Add new vault protocol: {protocol name}" \
  --body  $'Protocol: {protocok name}\nHomepage: {homepage link}\nGithub: {github link}\nDocs: {docs link}\nExample contract: {blockchain explorer link}" \
  --base master

Finding unique protocol identifiers

To find a function that uniquely identifies the protocol:

1. Read the ABI and look for:

   • Protocol-specific role constants (e.g., SAY_TRADER_ROLE() for Plutus)
   • Custom getter functions (e.g., getPerformanceFeeData() for IPOR)
   • Protocol registry calls (e.g., MORPHO() for Morpho)
   • Unique configuration functions

2. Verify the function is truly unique by checking it doesn't exist in other protocols

3. Some protocols may need name-based detection if no unique function exists:

   Copyname = calls["name"].result
   if name:
       name = name.decode("utf-8", errors="ignore")
       if "ProtocolName" in name:
           features.add(ERC4626Feature.{protocol_slug}_like)
   

Example ABI structure

The ABI JSON file should contain the contract's ABI array. Example:

Copy{
  "abi": [
    {
      "inputs": [],
      "name": "totalAssets",
      "outputs": [{ "type": "uint256" }],
      "stateMutability": "view",
      "type": "function"
    }
  ]
}

Or just the array directly:

Copy[
  {
    "inputs": [],
    "name": "totalAssets",
    "outputs": [{ "type": "uint256" }],
    "stateMutability": "view",
    "type": "function"
  }
]