CurrentDao Carbon Credit Trading Marketplace

A carbon credit trading smart contract built on Stellar using Soroban (Rust).

Deployed Contracts (Testnet)

Contract	Contract ID
Carbon Credit Trading	CBAVRNDLNEJ6DUMWFHUT2RBGQB32DVH7CTUYNKVN75VPR7CNJAWFQU2H
Token (Energy)	CA6RAANCSJKHS5FROBVZTPGYL3LIFG7ZFDIPYBFQEDKJX3TJYTJNFEG3
DAO	CC4RK4GSE7VWLCFJCFN6NEFKRJO77ITDPD7DPZFCUUNY64HA3VOUK7UA
Staking	CCE2KAT2Y46G33PX5XHRKZGILA6IIZWCW2WX7FOC6PCOUDERXAJQEDLP
Escrow	CC3MAEGQOAF77XAYSCG7GBYF4SG4BR7W2O5PEXITFHJAAJMY2R5DW64M
Oracles	CBRAD72TB5WUBMPBQ2DFMF4EPNAJGVHX2K3KZEHEU6SFLJALPXZFNKIX
Liquidity	CAT7FQ6GFZGPHUIBYERWIMJOIIBQY4IF5MS2BO4W7ILIWBYML3HV7YOK
Fees	CDSQDHBZMHSIEXMTRFBU7Z3CP2D3OEDJG257IFJAPMRKEUB5AVKVQN62
Settlement	CA6BFRCWVHIWW44DTNBB27KQSOAA3QSFMVMBNJDAIXDHXMJZRJVUUHKG
Certificates	CDVZC2RHDSPMF56EFUVRJSLUOIZANWVVJ2QHJLJRQMATGEIWCR3XM3LW
Compliance	CD3K2QBDBZFOGVYZ6UKJ3MW7XUC63X6YZG3BKFMI3IJ4DUXZEXXILDTX
Proposals	CANYIFDDDDTHY56I3JIGZ3EKTROAEDHKXBI55SVEII734EAJKQXQW2M33
NFT	CD3CFGKJVDJRWIK6ZY7NOUL7W7FUCZFZWPA5VONEN3M2MSDON3YFBZUB
Reporting	CCXPEP22QM5OM7JJDUZSSGV2YFPIMEZZICU5Y27ROX44NQVI64BU4QSY

Features

• Credit Issuance — Issue verified carbon credits with project metadata
• Verification — Authorized verifiers validate credits with confidence scores
• Trading — Place and fill buy/sell orders with fee calculation
• Batch Trading — Fill multiple orders in a single transaction
• Retirement — Retire credits and receive on-chain certificates
• Impact Metrics — Track CO2 equivalent, trees preserved, water saved, biodiversity index
• Standards — VCS, Gold Standard, CDM, Carbon Registry
• Admin Controls — Manage verifiers, standards, and trading fees

Contract Architecture

contracts/carbon/
├── Cargo.toml
└── src/
    └── lib.rs        # Soroban smart contract (Rust)

Installation

# Install Rust
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
rustup target add wasm32v1-none

# Install Stellar CLI
curl -fsSL https://github.com/stellar/stellar-cli/releases/download/v26.0.0/stellar-cli-26.0.0-x86_64-unknown-linux-gnu.tar.gz | tar -xz
mv stellar ~/.local/bin/

Build

stellar contract build --package carbon-credit-trading

Deploy

# Generate and fund a keypair
stellar keys generate deployer --network testnet
stellar keys fund deployer --network testnet

# Deploy
stellar contract deploy \
  --wasm target/wasm32v1-none/release/carbon_credit_trading.wasm \
  --source deployer \
  --network testnet

# Initialize
stellar contract invoke \
  --id <CONTRACT_ID> \
  --source deployer \
  --network testnet \
  -- initialize \
  --admin <YOUR_ADDRESS>

Usage

Issue a Credit

stellar contract invoke --id <CONTRACT_ID> --source deployer --network testnet \
  -- issue_credit \
  --issuer <ADDRESS> \
  --project_id "PROJ001" \
  --amount 1000 \
  --vintage 1704067200 \
  --standard "VCS" \
  --methodology "Forestry" \
  --metadata_uri "https://api.currentdao.io/metadata/1"

Verify a Credit

stellar contract invoke --id <CONTRACT_ID> --source verifier --network testnet \
  -- verify_credit \
  --verifier <ADDRESS> \
  --credit_id 1 \
  --is_valid true \
  --report_uri "https://api.currentdao.io/reports/1" \
  --confidence 95

Place a Buy Order

stellar contract invoke --id <CONTRACT_ID> --source trader --network testnet \
  -- place_buy_order \
  --trader <ADDRESS> \
  --credit_id 1 \
  --amount 100 \
  --price 100 \
  --expires_at 0

Retire a Credit

stellar contract invoke --id <CONTRACT_ID> --source holder --network testnet \
  -- retire_credit \
  --retiree <ADDRESS> \
  --credit_id 1 \
  --amount 50 \
  --reason "Carbon offset for Q1 2025"

Contract Functions

Function	Description
initialize	Set up contract with admin
issue_credit	Issue a new carbon credit
verify_credit	Verify a credit (verifiers only)
retire_credit	Retire credits, returns certificate ID
place_buy_order	Place a buy order
place_sell_order	Place a sell order
fill_order	Fill an existing order
batch_fill_orders	Fill multiple orders at once
cancel_order	Cancel an active order
update_impact_metrics	Update environmental impact data
add_verifier	Add authorized verifier (admin)
set_trading_fee	Set fee in basis points (admin)
get_credit	Get credit details
get_spot_price	Get current spot price for a credit
get_balance	Get account balance for a credit

Environmental Standards Supported

• VCS (Verified Carbon Standard)
• Gold Standard
• CDM (Clean Development Mechanism)
• Carbon Registry

License

MIT