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Offset Helper

This contract simplifies the carbon offsetting process on Toucan.

More specifically, the Offset Helper abstracts the process of using a stablecoin to acquire and retire TCO2. This process normally looks like:

  • user exchanges USDC (a stablecoin) for carbon reference tokens like BCT or NCT using a DEX like Uniswap, Sushiswap, etc. (depending on network)
  • user interacts with the BCT/NCT pool token contract to redeem TCO2 tokens from within the pool
  • user interacts with the TCO2 token contract to retire the TCO2

You can see this process explained in more depth in our docs.

With the OffsetHelper contract, the user only needs to interact with the OffsetHelper contract, which will take care of the rest in a single transaction.

Deployments

For current deployments, see the ./deployments folder.

OffsetHelper

The OffsetHelper contract implements helper functions that simplify the carbon offsetting (retirement) process.

See ./docs/OffsetHelper.md for detailed documentation.

Development

Prerequisites

  1. Install the required packages: 
    yarn
  2. Copy .env.example to .env and modify values of the required environment variables:
    1. POLYGON_URL/MUMBAI_URL to specify your preferred RPC endpoints for Polygon Mainnet and the Mumbai Testnet.
    2. PRIVATE_KEY and POLYGONSCAN_KEY in order to deploy contract and publish source code on polygonscan.

Commands

# install dependencies
yarn install
# test the contract
yarn test# generate documentation
yarn doc
# deploy the contract
yarn hardhat deploy --network <network># verify the contract
yarn hardhat verify:offsetHelper --network mumbai --address <address where Offset Helper was deployed>

About

A smart contract that abstracts away the process of offsetting CO2 on-chain. It takes you from USDC (or other tokens) to offset CO2.

Resources

Readme
GPL-3.0 license

Contributing

Contributing
Activity
Custom properties

Stars

13 stars

Watchers

2 watching

Forks

11 forks
Report repository

Releases

Packages

Used by

Contributors

Languages

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Offset Helper
This contract simplifies the carbon offsetting process on Toucan.
More specifically, the Offset Helper abstracts the process of using a stablecoin to acquire and retire TCO2. This process normally looks like:
  • user exchanges USDC (a stablecoin) for carbon reference tokens like BCT or NCT using a DEX like Uniswap, Sushiswap, etc. (depending on network)
  • user interacts with the BCT/NCT pool token contract to redeem TCO2 tokens from within the pool
  • user interacts with the TCO2 token contract to retire the TCO2
You can see this process explained in more depth in our docs.
With the OffsetHelper contract, the user only needs to interact with the OffsetHelper contract, which will take care of the rest in a single transaction.
Deployments
For current deployments, see the ./deployments folder.
OffsetHelper
The OffsetHelper contract implements helper functions that simplify the carbon offsetting (retirement) process.
See ./docs/OffsetHelper.md for detailed documentation.
Development
Prerequisites
  1. Install the required packages:

    yarn

  2. Copy .env.example to .env and modify values of the required environment variables:

    1. POLYGON_URL/MUMBAI_URL to specify your preferred RPC endpoints for Polygon Mainnet and the Mumbai Testnet.
    2. PRIVATE_KEY and POLYGONSCAN_KEY in order to deploy contract and publish source code on polygonscan.
Commands
# install dependencies
yarn install
# test the contract
yarn test# generate documentation
yarn doc
# deploy the contract
yarn hardhat deploy --network <network># verify the contract
yarn hardhat verify:offsetHelper --network mumbai --address <address where Offset Helper was deployed>
About
A smart contract that abstracts away the process of offsetting CO2 on-chain. It takes you from USDC (or other tokens) to offset CO2.
Resources
Readme
GPL-3.0 license
Contributing
Contributing
Activity
Custom properties
Stars
13 stars
Watchers
2 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Offset Helper
This contract simplifies the carbon offsetting process on Toucan.
More specifically, the Offset Helper abstracts the process of using a stablecoin to acquire and retire TCO2. This process normally looks like:
  • user exchanges USDC (a stablecoin) for carbon reference tokens like BCT or NCT using a DEX like Uniswap, Sushiswap, etc. (depending on network)
  • user interacts with the BCT/NCT pool token contract to redeem TCO2 tokens from within the pool
  • user interacts with the TCO2 token contract to retire the TCO2
You can see this process explained in more depth in our docs.
With the OffsetHelper contract, the user only needs to interact with the OffsetHelper contract, which will take care of the rest in a single transaction.
Deployments
For current deployments, see the ./deployments folder.
OffsetHelper
The OffsetHelper contract implements helper functions that simplify the carbon offsetting (retirement) process.
See ./docs/OffsetHelper.md for detailed documentation.
Development
Prerequisites
  1. Install the required packages:

    yarn

  2. Copy .env.example to .env and modify values of the required environment variables:

    1. POLYGON_URL/MUMBAI_URL to specify your preferred RPC endpoints for Polygon Mainnet and the Mumbai Testnet.
    2. PRIVATE_KEY and POLYGONSCAN_KEY in order to deploy contract and publish source code on polygonscan.
Commands
# install dependencies
yarn install
# test the contract
yarn test# generate documentation
yarn doc
# deploy the contract
yarn hardhat deploy --network <network># verify the contract
yarn hardhat verify:offsetHelper --network mumbai --address <address where Offset Helper was deployed>
About
A smart contract that abstracts away the process of offsetting CO2 on-chain. It takes you from USDC (or other tokens) to offset CO2.
Resources
Readme
GPL-3.0 license
Contributing
Contributing
Activity
Custom properties
Stars
13 stars
Watchers
2 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Offset Helper
This contract simplifies the carbon offsetting process on Toucan.
More specifically, the Offset Helper abstracts the process of using a stablecoin to acquire and retire TCO2. This process normally looks like:
  • user exchanges USDC (a stablecoin) for carbon reference tokens like BCT or NCT using a DEX like Uniswap, Sushiswap, etc. (depending on network)
  • user interacts with the BCT/NCT pool token contract to redeem TCO2 tokens from within the pool
  • user interacts with the TCO2 token contract to retire the TCO2
You can see this process explained in more depth in our docs.
With the OffsetHelper contract, the user only needs to interact with the OffsetHelper contract, which will take care of the rest in a single transaction.
Deployments
For current deployments, see the ./deployments folder.
OffsetHelper
The OffsetHelper contract implements helper functions that simplify the carbon offsetting (retirement) process.
See ./docs/OffsetHelper.md for detailed documentation.
Development
Prerequisites
  1. Install the required packages:

    yarn

  2. Copy .env.example to .env and modify values of the required environment variables:

    1. POLYGON_URL/MUMBAI_URL to specify your preferred RPC endpoints for Polygon Mainnet and the Mumbai Testnet.
    2. PRIVATE_KEY and POLYGONSCAN_KEY in order to deploy contract and publish source code on polygonscan.
Commands
# install dependencies
yarn install
# test the contract
yarn test# generate documentation
yarn doc
# deploy the contract
yarn hardhat deploy --network <network># verify the contract
yarn hardhat verify:offsetHelper --network mumbai --address <address where Offset Helper was deployed>
About
A smart contract that abstracts away the process of offsetting CO2 on-chain. It takes you from USDC (or other tokens) to offset CO2.
Resources
Readme
GPL-3.0 license
Contributing
Contributing
Activity
Custom properties
Stars
13 stars
Watchers
2 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Offset Helper
This contract simplifies the carbon offsetting process on Toucan.
More specifically, the Offset Helper abstracts the process of using a stablecoin to acquire and retire TCO2. This process normally looks like:
  • user exchanges USDC (a stablecoin) for carbon reference tokens like BCT or NCT using a DEX like Uniswap, Sushiswap, etc. (depending on network)
  • user interacts with the BCT/NCT pool token contract to redeem TCO2 tokens from within the pool
  • user interacts with the TCO2 token contract to retire the TCO2
You can see this process explained in more depth in our docs.
With the OffsetHelper contract, the user only needs to interact with the OffsetHelper contract, which will take care of the rest in a single transaction.
Deployments
For current deployments, see the ./deployments folder.
OffsetHelper
The OffsetHelper contract implements helper functions that simplify the carbon offsetting (retirement) process.
See ./docs/OffsetHelper.md for detailed documentation.
Development
Prerequisites
  1. Install the required packages:

    yarn

  2. Copy .env.example to .env and modify values of the required environment variables:

    1. POLYGON_URL/MUMBAI_URL to specify your preferred RPC endpoints for Polygon Mainnet and the Mumbai Testnet.
    2. PRIVATE_KEY and POLYGONSCAN_KEY in order to deploy contract and publish source code on polygonscan.
Commands
# install dependencies
yarn install
# test the contract
yarn test# generate documentation
yarn doc
# deploy the contract
yarn hardhat deploy --network <network># verify the contract
yarn hardhat verify:offsetHelper --network mumbai --address <address where Offset Helper was deployed>
About
A smart contract that abstracts away the process of offsetting CO2 on-chain. It takes you from USDC (or other tokens) to offset CO2.
Resources
Readme
GPL-3.0 license
Contributing
Contributing
Activity
Custom properties
Stars
13 stars
Watchers
2 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Offset Helper
This contract simplifies the carbon offsetting process on Toucan.
More specifically, the Offset Helper abstracts the process of using a stablecoin to acquire and retire TCO2. This process normally looks like:
  • user exchanges USDC (a stablecoin) for carbon reference tokens like BCT or NCT using a DEX like Uniswap, Sushiswap, etc. (depending on network)
  • user interacts with the BCT/NCT pool token contract to redeem TCO2 tokens from within the pool
  • user interacts with the TCO2 token contract to retire the TCO2
You can see this process explained in more depth in our docs.
With the OffsetHelper contract, the user only needs to interact with the OffsetHelper contract, which will take care of the rest in a single transaction.
Deployments
For current deployments, see the ./deployments folder.
OffsetHelper
The OffsetHelper contract implements helper functions that simplify the carbon offsetting (retirement) process.
See ./docs/OffsetHelper.md for detailed documentation.
Development
Prerequisites
  1. Install the required packages:

    yarn

  2. Copy .env.example to .env and modify values of the required environment variables:

    1. POLYGON_URL/MUMBAI_URL to specify your preferred RPC endpoints for Polygon Mainnet and the Mumbai Testnet.
    2. PRIVATE_KEY and POLYGONSCAN_KEY in order to deploy contract and publish source code on polygonscan.
Commands
# install dependencies
yarn install
# test the contract
yarn test# generate documentation
yarn doc
# deploy the contract
yarn hardhat deploy --network <network># verify the contract
yarn hardhat verify:offsetHelper --network mumbai --address <address where Offset Helper was deployed>
About
A smart contract that abstracts away the process of offsetting CO2 on-chain. It takes you from USDC (or other tokens) to offset CO2.
Resources
Readme
GPL-3.0 license
Contributing
Contributing
Activity
Custom properties
Stars
13 stars
Watchers
2 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Offset Helper
This contract simplifies the carbon offsetting process on Toucan.
More specifically, the Offset Helper abstracts the process of using a stablecoin to acquire and retire TCO2. This process normally looks like:
  • user exchanges USDC (a stablecoin) for carbon reference tokens like BCT or NCT using a DEX like Uniswap, Sushiswap, etc. (depending on network)
  • user interacts with the BCT/NCT pool token contract to redeem TCO2 tokens from within the pool
  • user interacts with the TCO2 token contract to retire the TCO2
You can see this process explained in more depth in our docs.
With the OffsetHelper contract, the user only needs to interact with the OffsetHelper contract, which will take care of the rest in a single transaction.
Deployments
For current deployments, see the ./deployments folder.
OffsetHelper
The OffsetHelper contract implements helper functions that simplify the carbon offsetting (retirement) process.
See ./docs/OffsetHelper.md for detailed documentation.
Development
Prerequisites
  1. Install the required packages:

    yarn

  2. Copy .env.example to .env and modify values of the required environment variables:

    1. POLYGON_URL/MUMBAI_URL to specify your preferred RPC endpoints for Polygon Mainnet and the Mumbai Testnet.
    2. PRIVATE_KEY and POLYGONSCAN_KEY in order to deploy contract and publish source code on polygonscan.
Commands
# install dependencies
yarn install
# test the contract
yarn test# generate documentation
yarn doc
# deploy the contract
yarn hardhat deploy --network <network># verify the contract
yarn hardhat verify:offsetHelper --network mumbai --address <address where Offset Helper was deployed>
About
A smart contract that abstracts away the process of offsetting CO2 on-chain. It takes you from USDC (or other tokens) to offset CO2.
Resources
Readme
GPL-3.0 license
Contributing
Contributing
Activity
Custom properties
Stars
13 stars
Watchers
2 watching
Forks
11 forks
Report repository
Releases
Packages
Used by
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
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Offset Helper
This contract simplifies the carbon offsetting process on Toucan.
More specifically, the Offset Helper abstracts the process of using a stablecoin to acquire and retire TCO2. This process normally looks like:
  • user exchanges USDC (a stablecoin) for carbon reference tokens like BCT or NCT using a DEX like Uniswap, Sushiswap, etc. (depending on network)
  • user interacts with the BCT/NCT pool token contract to redeem TCO2 tokens from within the pool
  • user interacts with the TCO2 token contract to retire the TCO2
You can see this process explained in more depth in our docs.
With the OffsetHelper contract, the user only needs to interact with the OffsetHelper contract, which will take care of the rest in a single transaction.
Deployments
For current deployments, see the ./deployments folder.
OffsetHelper
The OffsetHelper contract implements helper functions that simplify the carbon offsetting (retirement) process.
See ./docs/OffsetHelper.md for detailed documentation.
Development
Prerequisites
  1. Install the required packages:

    yarn

  2. Copy .env.example to .env and modify values of the required environment variables:

    1. POLYGON_URL/MUMBAI_URL to specify your preferred RPC endpoints for Polygon Mainnet and the Mumbai Testnet.
    2. PRIVATE_KEY and POLYGONSCAN_KEY in order to deploy contract and publish source code on polygonscan.
Commands
# install dependencies
yarn install
# test the contract
yarn test# generate documentation
yarn doc
# deploy the contract
yarn hardhat deploy --network <network># verify the contract
yarn hardhat verify:offsetHelper --network mumbai --address <address where Offset Helper was deployed>
About
A smart contract that abstracts away the process of offsetting CO2 on-chain. It takes you from USDC (or other tokens) to offset CO2.
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