evm-translator

a library for making EVM-based blockchain data more human-readable

Our ABI Dataset

In the process of building this, we also assembled the most complete ABI dataset for Ethereum on the internet, with 441,000+ unique ABI Fragments. We started with 4byte directory, but quickly realized it didn't have the information needed to decode events and functions calls - it doesn't store full signatures, which includes names of parameters and if they're indexed or not. To use this dataset for your own projects, download it from Metagame’s Google Drive folder. It can be dropped directly into a MongoDB instance (we’ve been using Mongo's Compass as a GUI) to interact with programmatically.

Contribute

If you're looking to contribute to evm-translator, click here.

Logical Layout

Raw data fetcher
Decoder
Interpreter
- Contract-specific interpreters
- Generic Interpreters
  - transfers
  - tokens
  - fallback

Usage

yarn add evm-translator

npm install evm-translator

import Translator, { chains } from 'evm-translator'

import {
    ALCHEMY_PROJECT_ID,
    COVALENT_API_KEY,
    ETHERSCAN_API_KEY,
    EVM_TRANSLATOR_CONNECTION_STRING,
} from 'where/you/store/your/env/variables'

    const networkId = 1
    const chain = Object.values(chains).find((chain) => chain.id === networkId)
    const address = '0x7d0414b0622f485d0368602e76f502cabef57bf4'

    const translator = new Translator({
        chain,
        alchemyProjectId: ALCHEMY_PROJECT_ID,
        etherscanAPIKey: ETHERSCAN_API_KEY,
        connectionString: EVM_TRANSLATOR_CONNECTION_STRING,
        covalentAPIKey: COVALENT_API_KEY, // used for retrieving txHashArr of an address
        etherscanServiceLevel: 5,
        userAddress: address,
    })

    await translator.initializeMongoose()

    // some option of what you can do

    const txHash = '0x814ec7ed69beca48209597f4975aaab605069546da6fc330ad1c0d180d6e525f'

    const { decodedTx, rawTxData } = await translator.decodeFromTxHash(txHash)
    const { interpretedData, decodedTx, rawTxData} = await translator.allDataFromTxHash(txHash)


    const txHashArr = await translator.getTxHashArrayForAddress(address)

    const decodedTxArr = await translator.decodeFromTxHashArr(txHashArr)
    const allDataArr = await translator.allDataFromTxHash(txHashArr)

If a transaction interacts with 5 addresses, there will be 5 different interpretations, each from the perspective of each address. When interpreting a transaction, if an address is not provided, the interpretation will default to using the from address of the transaction.

Contractor-specific Interpreter Maps

The long-term vision is that every contract creator (or their community) writes one of these JSON maps for their contract and adds the IPFS/Arweave/API URL to the JSON in their contract as a read function that we can query and index.

The mid-term vision is we store these maps in a openly accessible database. When we interpret a transaction, we query the DB.

The current state is that we have a folder of JSON files in the repo.

An example of an Interpreter Map

{
    "contractAddress": "0x7a250d5630b4cf539739df2c5dacb4c659f2488d",
    "contractOfficialName": "UniswapV2Router02",
    "contractName": "Uniswap V2",
    "entityName": "Uniswap",
    "writeFunctions": {
        "addLiquidity": {
            "action": "added liquidity",
            "keywords": {
                "token_0": {
                    "key": "contractSymbol",
                    "filters": {
                        "eventName": "Transfer",
                        "from": "{userAddress}"
                    },
                    "defaultValue": "unknown"
                },
                "token_1": {
                    "key": "contractSymbol",
                    "filters": {
                        "eventName": "Transfer",
                        "from": "{userAddress}"
                    },
                    "index": 1,
                    "defaultValue": "unknown"
                }
            },
            "exampleDescriptionTemplate": "{userName} added liquidity to the {token_0}-{token_1} {contractName} pool",
            "exampleDescription": "0xf1a9 added liquidity to the SUPER-WETH Uniswap V2 pool"
        },
        "addLiquidityETH": {
            "action": "added liquidity",
            "keywords": {
                "token_0": {
                    "key": "contractSymbol",
                    "filters": {
                        "eventName": "Transfer",
                        "from": "{userAddress}"
                    },
                    "defaultValue": "unknown"
                }
            },
            "exampleDescriptionTemplate": "{userName} {action} to the {token_0}-{chainSymbol} {contractName} pool",
            "exampleDescription": "0xf1a9 added liquidity to the ACYC-ETH Uniswap V2 pool"
        }
    }
}

If you want to add your own contract specific interpretation, click here.

This is an example of the decoded event logs when the addLiquidity function gets called.

{
    "txHash": "0x0e6388e80a6023cfc8e7b9fb2ff94e3bf5d34cdc8bb348d124e2385e29d5bcf8",
    "txType": "contract interaction",
    "nativeValueSent": "0",
    "chainSymbol": "ETH",
    "txIndex": 191,
    "reverted": false,
    "gasUsed": "142824",
    "effectiveGasPrice": "176081789506",
    "fromAddress": "0xf1a935a3588d20994e02848c93b107000a60110d",
    "toAddress": "0x7a250d5630b4cf539739df2c5dacb4c659f2488d",
    "interactions": [
        {
            "contractName": "Uniswap V2",
            "contractSymbol": "UNI-V2",
            "contractAddress": "0x25647e01bd0967c1b9599fa3521939871d1d0888",
            "events": [
                {
                    "eventName": "Mint",
                    "logIndex": 300,
                    "params": {
                        "sender": "0x7a250d5630b4cf539739df2c5dacb4c659f2488d",
                        "amount0": "1373338329117707188",
                        "amount1": "3432476292290743708413"
                    }
                },
                {
                    "eventName": "Sync",
                    "logIndex": 299,
                    "params": {
                        "reserve0": "4747953991459041932832",
                        "reserve1": "11866878806943684115024747"
                    }
                },
                {
                    "eventName": "Transfer",
                    "logIndex": 298,
                    "params": {
                        "from": "0x0000000000000000000000000000000000000000",
                        "to": "0xf1a935a3588d20994e02848c93b107000a60110d",
                        "value": "40.512792305770100502"
                    }
                }
            ]
        },
        {
            "contractName": "SuperFarm",
            "contractSymbol": "SUPER",
            "contractAddress": "0xe53ec727dbdeb9e2d5456c3be40cff031ab40a55",
            "events": [
                {
                    "eventName": "Approval",
                    "logIndex": 297,
                    "params": {
                        "owner": "0xf1a935a3588d20994e02848c93b107000a60110d",
                        "spender": "0x7a250d5630b4cf539739df2c5dacb4c659f2488d",
                        "value": "115792089237316195423570985008687907853269984665640564036025.107715622385931522"
                    }
                },
                {
                    "eventName": "Transfer",
                    "logIndex": 296,
                    "params": {
                        "from": "0xf1a935a3588d20994e02848c93b107000a60110d",
                        "to": "0x25647e01bd0967c1b9599fa3521939871d1d0888",
                        "value": "3432.476292290743708413"
                    }
                }
            ]
        },
        {
            "contractName": "Wrapped Ether",
            "contractSymbol": "WETH",
            "contractAddress": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
            "events": [
                {
                    "eventName": "Transfer",
                    "logIndex": 295,
                    "params": {
                        "from": "0xf1a935a3588d20994e02848c93b107000a60110d",
                        "to": "0x25647e01bd0967c1b9599fa3521939871d1d0888",
                        "value": "1.373338329117707188"
                    }
                }
            ]
        }
    ],
    "contractType": "OTHER",
    "methodCall": {
        "name": "addLiquidity",
        "arguments": {...}
    },
    "traceCalls": [
        {
            "name": "getPair",
            "params": {}
        }
        ...
    ],
    "timestamp": "2021-12-01T00:06:38Z",
    "officialContractName": "UniswapV2Router02"
}

When the above map is applied to above decoded event logs, this is the interpretation that it will generate.

{
    "txHash": "0x0e6388e80a6023cfc8e7b9fb2ff94e3bf5d34cdc8bb348d124e2385e29d5bcf8",
    "userAddress": "0xf1a935a3588d20994e02848c93b107000a60110d",
    "userName": "0xf1a9",
    "entityName": "Uniswap",
    "contractName": "Uniswap V2",
    "contractOfficialName": "UniswapV2Router02",
    "action": ["added liquidity"],
    "exampleDescription": "0xf1a9 added liquidity to the SUPER-WETH Uniswap V2 pool",
    "nativeValueSent": "0",
    "nativeValueReceived": "0",
    "chainSymbol": "ETH",
    "tokensReceived": [
        {
            "type": "LPToken",
            "name": "Uniswap V2",
            "symbol": "UNI-V2",
            "address": "0x25647e01bd0967c1b9599fa3521939871d1d0888",
            "amount": "40.512792305770100502"
        }
    ],
    "tokensSent": [
        {
            "type": "ERC20",
            "name": "SuperFarm",
            "symbol": "SUPER",
            "address": "0xe53ec727dbdeb9e2d5456c3be40cff031ab40a55",
            "amount": "3432.476292290743708413"
        },
        {
            "type": "ERC20",
            "name": "Wrapped Ether",
            "symbol": "WETH",
            "address": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
            "amount": "1.373338329117707188"
        }
    ],
    "gasPaid": "0.025148705504404944",
    "extra": {
        "token_0": "SUPER",
        "token_1": "WETH"
    }
}

The Interpreter Map supplies contractName, action, extra, and a more specific exampleDescription.

All other values come from generic interpretations.

Handling special transactions

Double-sided transactions

Some transactions like an NFT sale should have very different interpretations based on the perspective we view it from. The getActionFromInterpretation function within /src/core/DoubleSidedInterpreter.ts uses the tokensSent and tokensReceived fields from the interpretation to deduce the action.

Within the contract specific interpreter JSON files that handle such transactions, the "action": "__NFTSALE__" is used to denote an action that varies on the perspective of the user. Also {__NATIVEVALUETRANSFERRED__} denotes the selling price of the NFT when we are unsure if we should use nativeValueSent or nativeValueReceived.

See 0xc814cb6b61222beda8a9bcc359e776e72ae732a1c29df572099ecef27c8461e4 as an example of such a transaction.

Multicall transactions

Some transactions like a Uniswap V3 multicall are really multiple transactions disguised as one. During the decoding process, the decodeRawTxTrace function within /src/core/MulticallTxInterpreter.ts grabs the "second-level" method calls and put those into the traceCalls field within the DecodedTx. We keep track of multicall method names and contract addresses within /src/interfaces/utils.ts and when we identify a transaction falling into this category, we use the second-level methods to populate the action array within the Interpretation object.