Add vault protocol

This skill guides you through adding support for a new ERC-4626 vault protocol to the eth_defi library.

Required inputs

Before starting, gather the following information from the user:

1. Vault smart contract address - The address of an example vault contract on a blockchain
2. Protocol name - Human-readable name (e.g., "Plutus", "IPOR", "Morpho")
3. Protocol slug - Snake_case identifier for code (e.g., "plutus", "ipor", "morpho")
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.
7. Risk level: Optional. If not given, set to None

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:

   eth_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

Create eth_defi/erc_4626/vault_protocol/{protocol_slug}/vault.py following the patterns in:

• eth_defi/erc_4626/vault_protocol/plutus/vault.py - Simple vault with hardcoded fees
• eth_defi/erc_4626/vault_protocol/ipor/vault.py - Complex vault with custom fee reading and multicall support

The vault class should:

"""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 {ProtocolName}Vault(ERC4626Vault):
    """Protocol vault support.

    One line description of the protocol.

    - Add links to protocol documentation
    - Add links to example contracts on block explorers
    - Add links to github
    - If fee information is documented or available as Github source code, link into it
    """

    def has_custom_fees(self) -> bool:
        return False  # Adjust based on protocol

    def get_management_fee(self, block_identifier: BlockIdentifier) -> float:
        return None

    def get_performance_fee(self, block_identifier: BlockIdentifier) -> float | None:
        return None

    def get_estimated_lock_up(self) -> datetime.timedelta | None:
        return None

    def get_link(self, referral: str | None = None) -> str:
        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 feature enum

Edit eth_defi/erc_4626/core.py and add a new enum member to ERC4626Feature:

#: {Protocol Name}
#:
#: {Protocol URL}
{protocol_slug}_like = "{protocol_slug}_like"

Also update get_vault_protocol_name() to return the protocol name:

elif ERC4626Feature.{protocol_slug}_like in features:
    return "{Protocol Name}"

Step 4: 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.

# {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

2. In identify_vault_features(), add detection logic:

if 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():

elif 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 risk and fee information

Update eth_defi/vault/risk.py with the protocol stub.

Set the initial risk level for the protocol in VAULT_PROTOCOL_RISK_MATRIX. USe None if not given and this will be later updated by human judgement.

Update eth_defi/vault/fee.py with the protocol stub.

Set VAULT_PROTOCOL_FEE_MATRIX to None for newly added protocol.

Match get_vault_protocol_name() for the protocol name spelling.

Step 6: Create test file

Create 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:

"""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 using given JSON-RPC URL and Python's Web3.py web3.eth.block_number call
• 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: Add module init.py

Create eth_defi/erc_4626/vault_protocol/{protocol_slug}/__init__.py:

"""{Protocol Name} protocol integration."""

Step 8: Update documentation

• Add protocol to docs/source/vaults
• Include protocol name
• Search web for a short description, two paragraph
• Add a link to the protocol home page and documentation
• Search Github/web for a Github repo link of the smart contracts
• Search protocol homepage for Twitter link and add it to the documentation
• Add the new modules to the protocol index page TOC
• Add the protocol to the master index in docs/source/vaults/index.rst

Examples include

• docs/source/vaults/plutus/index.rst, docs/source/vaults/truefi/index.rst, docs/source/api/vaults/index.rst,

Step 9: Run all vault protocol detection tests

Check that all ERC-4626 tests pass after adding a new vault protocol by running all testse in tests/erc_4626/vault_protocol folder.

Run all vault testes:

source .local-test.env && poetry run pytest -n auto -k vault_protocol

Fix any issues if found.

Step 10: Format the codebase

Format the newly added files with poetry run ruff format.

Step 11: 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 13: Pull request (optional)

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

gh 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:

   name = 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:

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

Or just the array directly:

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