npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@playmint/eth-carbon

v1.0.0

Published

Small library for calculating carbon footprint of Ethereum smart contracts

Downloads

6

Readme

eth-carbon

NPM Package Small library to estimate the CO2 emissions that Ethereum smart contracts are responsible for.

Installation

npm install @playmint/eth-carbon

API

async function estimateCO2(etherscanApiKey: string, contracts: ContractFilter[]): Promise<EmissionsReport>

type EmissionsEstimate = {
    txCount: number;// number of transactions
    gas: bigint;    // amount of gas used for calculation
    lower: number;  // lower bound
    best: number;   // best guess
    upper: number;  // upper bound
};

type EmissionsReport = {
    total: EmissionsEstimate;
    byAddress: { [address: string]: EmissionsReportForAddress };
    byDate: { [date: string]: EmissionsEstimate };
};

type EmissionsReportForAddress = {
    total: EmissionsEstimate;
    byDate: { [date: string]: EmissionsReportForAddressAndDate };
    bySelector: { [selector: string]: EmissionsEstimate };
};

type EmissionsReportForAddressAndDate = {
    total: EmissionsEstimate;
    bySelector: { [selector: string]: EmissionsEstimate };
};

type ContractFilter = {
    // contract address
    address: string;
    // include the contract creation transaction, defaults to true
    shouldIncludeContractCreation?: boolean;
    // include failed transactions, default is false
    shouldIncludeFailedTransactions?: boolean;
    // 4 byte function selectors to include, if both 'selectors' and 'functions' 
    // are undefined, then all transactions will be included
    selectors?: Set<string>;
    // can include either function names or signatures, or both. If any function
    // names are specified then the signature will be looked up from the ABI. If
    // multiple functions have the same name then this will fail.
    functions?: Set<string>;
    // this is only required if any functions are specified just as a function name
    // and not the full function signature. If an ABI is needed but none is given,
    // then an attempt will be made to get the ABI from etherscan, if the contract
    // isn't verified on etherscan then this step will fail. This can be a json
    // string, or an array of objects fitting the ABIFunction type (e.g.
    // ethers.utils.Interface.fragments). This is also used if selectors are
    // specified in the filter rather than the function name, the report will
    // attempt to display the function name in the report along with the selector
    // to make it more readable, however if an abi can't be found then it will
    // still produce the report using just the selectors.
    abi?: string | readonly ABIFunction[];
    // used to convert a selector to a function name, if omitted then it will be
    // automatically generated from the abi
    selectorToFunction?: { [selector: string]: string };
};

type ABIField = {
	name: string;
	type: string;
	components?: ABIField[];
};

type ABIFunction = {
	type: "function" | "constructor" | "receive" | "fallback";
	name: string;
	inputs: ABIField[];
	outputs?: ABIField[];
	stateMutability: "pure" | "view" | "payable" | "nonpayable";
};

async function getTransactionsForContracts(apiKey: string, contracts: ContractFilter[]): Promise<{[address: string]: Transaction[]}>

type Transaction = {
	blockNumber: number;
	timeStamp: number;
	input: string;
	gasUsed: number;
	isError: boolean;
	selector: string;
	isContractCreation: boolean;
};

Examples

Standard emissions report

import {estimateCO2} from "@playmint/eth-carbon";

async function main() {
    const contracts = [{address: "<contractAddress1>"}, {address: "<contractAddress2>"}];
	const emissionsReport = await estimateCO2("<etherscan API key>", contracts);

    console.log(reportToString(report, contracts));
}

main().catch((e) => {
	console.error(e);
}

Filtering by functions and selectors

const emissionsReport = await estimateCO2(
	"<etherscan API key>", [{
		address: "<contractAddress>",
		selectors: new Set<string>(["12345678", "9abcdef0"]),
		functions: new Set<string>(["func1", "func2", "func3(uint256,string)"])
	}]);

Passing ABI from EthersJS object

let contract = new ethers.Contract(...);
const emissionsReport = await estimateCO2(
	"<etherscan api key>", [{
		address:"<contractAddress>",
		functions:  new  Set<string>(["func1", "func2"]),
		abi:  contract.interface.fragments  as  unknown  as  ABIFunction[]
	}]);

Example EmissionsReport object

{
    "total": {
        "txCount": 9,
        "gas": "4314765",
        "lower": 0.6446255524183231,
        "best": 0.905229230287158,
        "upper": 1.2960386267870376
    },
    "byAddress": {
        "0x38065291fDce1A752afD725e96FF75E1c38aD6aa": {
            "total": {
                "txCount": 6,
                "gas": "817602",
                "lower": 0.11491131630982421,
                "best": 0.1639256825215661,
                "upper": 0.23690653735634648
            },
            "byDate": {
                "2022-01-27T00:00:00.000Z": {
                    "total": {
                        "txCount": 3,
                        "gas": "655833",
                        "lower": 0.09163122585960128,
                        "best": 0.13090175122800182,
                        "upper": 0.18980753928060262
                    },
                    "bySelector": {
                        "60806040": {
                            "txCount": 1,
                            "gas": "135596",
                            "lower": 0.01894510904705694,
                            "best": 0.02706444149579563,
                            "upper": 0.03924344016890366
                        },
                        "1acbd301": {
                            "txCount": 1,
                            "gas": "466310",
                            "lower": 0.06515158116561788,
                            "best": 0.09307368737945411,
                            "upper": 0.13495684670020847
                        },
                        "168a35fa": {
                            "txCount": 1,
                            "gas": "53927",
                            "lower": 0.0075345356469264544,
                            "best": 0.010763622352752078,
                            "upper": 0.015607252411490514
                        },
                        "contractCreation": {
                            "txCount": 1,
                            "gas": "135596",
                            "lower": 0.01894510904705694,
                            "best": 0.02706444149579563,
                            "upper": 0.03924344016890366
                        },
                        "init(string,string,address,string,string,string,string,string,string,uint256,address)": {
                            "txCount": 1,
                            "gas": "466310",
                            "lower": 0.06515158116561788,
                            "best": 0.09307368737945411,
                            "upper": 0.13495684670020847
                        },
                        "addWhitelistedMinter(address)": {
                            "txCount": 1,
                            "gas": "53927",
                            "lower": 0.0075345356469264544,
                            "best": 0.010763622352752078,
                            "upper": 0.015607252411490514
                        }
                    }
                },
                "2022-02-09T00:00:00.000Z": {
                    "total": {
                        "txCount": 1,
                        "gas": "53915",
                        "lower": 0.007543440454171489,
                        "best": 0.01077634350595927,
                        "upper": 0.015625698083640942
                    },
                    "bySelector": {
                        "168a35fa": {
                            "txCount": 1,
                            "gas": "53915",
                            "lower": 0.007543440454171489,
                            "best": 0.01077634350595927,
                            "upper": 0.015625698083640942
                        },
                        "addWhitelistedMinter(address)": {
                            "txCount": 1,
                            "gas": "53915",
                            "lower": 0.007543440454171489,
                            "best": 0.01077634350595927,
                            "upper": 0.015625698083640942
                        }
                    }
                },
                "2022-03-03T00:00:00.000Z": {
                    "total": {
                        "txCount": 1,
                        "gas": "53927",
                        "lower": 0.007569722759654204,
                        "best": 0.010813889656648864,
                        "upper": 0.015139445519308408
                    },
                    "bySelector": {
                        "168a35fa": {
                            "txCount": 1,
                            "gas": "53927",
                            "lower": 0.007569722759654204,
                            "best": 0.010813889656648864,
                            "upper": 0.015139445519308408
                        },
                        "addWhitelistedMinter(address)": {
                            "txCount": 1,
                            "gas": "53927",
                            "lower": 0.007569722759654204,
                            "best": 0.010813889656648864,
                            "upper": 0.015139445519308408
                        }
                    }
                },
                "2022-04-14T00:00:00.000Z": {
                    "total": {
                        "txCount": 1,
                        "gas": "53927",
                        "lower": 0.008166927236397246,
                        "best": 0.011433698130956144,
                        "upper": 0.016333854472794493
                    },
                    "bySelector": {
                        "168a35fa": {
                            "txCount": 1,
                            "gas": "53927",
                            "lower": 0.008166927236397246,
                            "best": 0.011433698130956144,
                            "upper": 0.016333854472794493
                        },
                        "addWhitelistedMinter(address)": {
                            "txCount": 1,
                            "gas": "53927",
                            "lower": 0.008166927236397246,
                            "best": 0.011433698130956144,
                            "upper": 0.016333854472794493
                        }
                    }
                }
            },
            "bySelector": {
                "60806040": {
                    "txCount": 1,
                    "gas": "135596",
                    "lower": 0.01894510904705694,
                    "best": 0.02706444149579563,
                    "upper": 0.03924344016890366
                },
                "1acbd301": {
                    "txCount": 1,
                    "gas": "466310",
                    "lower": 0.06515158116561788,
                    "best": 0.09307368737945411,
                    "upper": 0.13495684670020847
                },
                "168a35fa": {
                    "txCount": 4,
                    "gas": "215696",
                    "lower": 0.030814626097149394,
                    "best": 0.043787553646316354,
                    "upper": 0.06270625048723436
                },
                "contractCreation": {
                    "txCount": 1,
                    "gas": "135596",
                    "lower": 0.01894510904705694,
                    "best": 0.02706444149579563,
                    "upper": 0.03924344016890366
                },
                "init(string,string,address,string,string,string,string,string,string,uint256,address)": {
                    "txCount": 1,
                    "gas": "466310",
                    "lower": 0.06515158116561788,
                    "best": 0.09307368737945411,
                    "upper": 0.13495684670020847
                },
                "addWhitelistedMinter(address)": {
                    "txCount": 4,
                    "gas": "215696",
                    "lower": 0.030814626097149394,
                    "best": 0.043787553646316354,
                    "upper": 0.06270625048723436
                }
            }
        },
        "0xe3c37f80077689f660Cd63BD48D81C746dF51363": {
            "total": {
                "txCount": 3,
                "gas": "3497163",
                "lower": 0.5297142361084989,
                "best": 0.7413035477655918,
                "upper": 1.0591320894306913
            },
            "byDate": {
                "2022-04-14T00:00:00.000Z": {
                    "total": {
                        "txCount": 2,
                        "gas": "3468398",
                        "lower": 0.525268494313901,
                        "best": 0.7353758920394613,
                        "upper": 1.050536988627802
                    },
                    "bySelector": {
                        "61028060": {
                            "txCount": 1,
                            "gas": "3422023",
                            "lower": 0.518245273096553,
                            "best": 0.7255433823351742,
                            "upper": 1.036490546193106
                        },
                        "399dde76": {
                            "txCount": 1,
                            "gas": "46375",
                            "lower": 0.007023221217347939,
                            "best": 0.009832509704287114,
                            "upper": 0.014046442434695878
                        },
                        "contractCreation": {
                            "txCount": 1,
                            "gas": "3422023",
                            "lower": 0.518245273096553,
                            "best": 0.7255433823351742,
                            "upper": 1.036490546193106
                        },
                        "setRelayAddress(address,bool)": {
                            "txCount": 1,
                            "gas": "46375",
                            "lower": 0.007023221217347939,
                            "best": 0.009832509704287114,
                            "upper": 0.014046442434695878
                        }
                    }
                },
                "2022-04-21T00:00:00.000Z": {
                    "total": {
                        "txCount": 1,
                        "gas": "28765",
                        "lower": 0.0044457417945978715,
                        "best": 0.0059276557261304956,
                        "upper": 0.008595100802889218
                    },
                    "bySelector": {
                        "d8db091e": {
                            "txCount": 1,
                            "gas": "28765",
                            "lower": 0.0044457417945978715,
                            "best": 0.0059276557261304956,
                            "upper": 0.008595100802889218
                        },
                        "enableXpRewards(bool)": {
                            "txCount": 1,
                            "gas": "28765",
                            "lower": 0.0044457417945978715,
                            "best": 0.0059276557261304956,
                            "upper": 0.008595100802889218
                        }
                    }
                }
            },
            "bySelector": {
                "61028060": {
                    "txCount": 1,
                    "gas": "3422023",
                    "lower": 0.518245273096553,
                    "best": 0.7255433823351742,
                    "upper": 1.036490546193106
                },
                "399dde76": {
                    "txCount": 1,
                    "gas": "46375",
                    "lower": 0.007023221217347939,
                    "best": 0.009832509704287114,
                    "upper": 0.014046442434695878
                },
                "d8db091e": {
                    "txCount": 1,
                    "gas": "28765",
                    "lower": 0.0044457417945978715,
                    "best": 0.0059276557261304956,
                    "upper": 0.008595100802889218
                },
                "contractCreation": {
                    "txCount": 1,
                    "gas": "3422023",
                    "lower": 0.518245273096553,
                    "best": 0.7255433823351742,
                    "upper": 1.036490546193106
                },
                "setRelayAddress(address,bool)": {
                    "txCount": 1,
                    "gas": "46375",
                    "lower": 0.007023221217347939,
                    "best": 0.009832509704287114,
                    "upper": 0.014046442434695878
                },
                "enableXpRewards(bool)": {
                    "txCount": 1,
                    "gas": "28765",
                    "lower": 0.0044457417945978715,
                    "best": 0.0059276557261304956,
                    "upper": 0.008595100802889218
                }
            }
        }
    },
    "byDate": {
        "2022-01-27T00:00:00.000Z": {
            "txCount": 3,
            "gas": "655833",
            "lower": 0.09163122585960128,
            "best": 0.13090175122800182,
            "upper": 0.18980753928060262
        },
        "2022-02-09T00:00:00.000Z": {
            "txCount": 1,
            "gas": "53915",
            "lower": 0.007543440454171489,
            "best": 0.01077634350595927,
            "upper": 0.015625698083640942
        },
        "2022-03-03T00:00:00.000Z": {
            "txCount": 1,
            "gas": "53927",
            "lower": 0.007569722759654204,
            "best": 0.010813889656648864,
            "upper": 0.015139445519308408
        },
        "2022-04-14T00:00:00.000Z": {
            "txCount": 3,
            "gas": "3522325",
            "lower": 0.5334354215502982,
            "best": 0.7468095901704175,
            "upper": 1.0668708431005964
        },
        "2022-04-21T00:00:00.000Z": {
            "txCount": 1,
            "gas": "28765",
            "lower": 0.0044457417945978715,
            "best": 0.0059276557261304956,
            "upper": 0.008595100802889218
        }
    }
}

How it works

Contract transactions are divided into days, and their combined gas cost per day is calculated. Using daily network gas usage data from https://etherscan.io/chart/gasused it calculates the percentage of the daily gas used by the contract. Then using daily CO2 emissions estimates from https://kylemcdonald.github.io/ethereum-emissions/ it uses the daily gas percentage to estimate emissions for that day. All of the emissions figures across all days can then be added together for a final total figure.