Celo MCP Server

A Model Context Protocol (MCP) server for interacting with the Celo blockchain. This server provides comprehensive access to Celo blockchain data, token operations, NFT management, smart contract interactions, transaction handling, and governance operations.

Installation

1. Clone the repository:

git clone https://github.com/celo-org/celo-mcp
cd celo-mcp

2. Install dependencies:

pip install -e .

3. Set up environment variables (optional):

export CELO_MCP_RPC_URL="https://forno.celo.org"  # Default: Celo mainnet
export CELO_MCP_USE_TESTNET=true                  # Use Celo Sepolia instead

MCP Integration

Cursor IDE Integration

To use this MCP server with Cursor IDE, add the following configuration to your MCP settings file (~/.cursor/mcp.json):

{
  "mcpServers": {
    "celo-mcp": {
      "command": "uvx",
      "args": ["--refresh", "celo-mcp"]
    }
  }
}

The --refresh flag ensures that the latest code is always loaded when the MCP server starts.

Claude Desktop Integration

For Claude Desktop, add this configuration to your MCP settings file (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "celo-mcp": {
      "command": "uvx",
      "args": ["--refresh", "celo-mcp"]
    }
  }
}

Connect remotely (Streamable HTTP)

The server can also run as a remote MCP endpoint over Streamable HTTP, so clients connect with a single URL — no local Python install. The stdio setup above is unchanged; this is an additional transport.

Run it in HTTP mode:

celo-mcp-server --transport http --port 3000
# or via env:
MCP_TRANSPORT=http PORT=3000 celo-mcp-server

Then point any remote-capable MCP client at the URL:

{
  "mcpServers": {
    "celo": { "url": "https://<your-host>/mcp" }
  }
}

Configuration (environment variables):

GET /health returns 200 for hosting health checks. See docs/DEPLOYMENT.md for container/hosting instructions.

Usage

Running the Server

# Run the MCP server
python -m celo_mcp.server

# Or use the CLI entry point
celo-mcp-server

Available Tools

Blockchain Data Operations

1. get_network_status

   • Get current network status and connection information
   • No parameters required

2. get_block

   • Fetch block information by number, hash, or "latest"
   • Parameters: block_identifier, include_transactions (optional)

3. get_transaction

   • Get transaction details by hash
   • Parameters: tx_hash

4. get_account

   • Get account information including balance and nonce
   • Parameters: address

5. get_latest_blocks

   • Get information about recent blocks
   • Parameters: count (optional, default: 10, max: 100)

Token Operations

6. get_token_info

   • Get detailed token information (name, symbol, decimals, supply)
   • Parameters: token_address

7. get_token_balance

   • Get token balance for a specific address
   • Parameters: token_address, address

8. get_celo_balances

   • Get CELO and stable token balances for an address
   • Parameters: address

NFT Operations

9. get_nft_info

   • Get NFT information including metadata and collection details
   • Parameters: contract_address, token_id

10. get_nft_balance

    • Get NFT balance for an address (supports ERC721 and ERC1155)
    • Parameters: contract_address, address, token_id (optional for ERC1155)

Smart Contract Operations

11. call_contract_function

    • Call a read-only contract function
    • Parameters: contract_address, function_name, abi, function_args (optional), from_address (optional)

12. estimate_contract_gas

    • Estimate gas for a contract function call
    • Parameters: contract_address, function_name, abi, from_address, function_args (optional), value (optional)

Transaction Operations

13. estimate_transaction

    • Estimate gas and cost for a transaction
    • Parameters: to, from_address, value (optional), data (optional)

14. get_gas_fee_data

    • Get current gas fee data including EIP-1559 fees
    • No parameters required

Governance Operations

15. get_governance_proposals

    • Get Celo governance proposals with pagination support
    • Parameters: include_inactive (optional), include_metadata (optional), page (optional), page_size (optional), offset (optional), limit (optional)

16. get_proposal_details

    • Get detailed information about a specific governance proposal including content and voting history
    • Parameters: proposal_id

Staking Operations

17. get_staking_balances

    • Get staking balances for an address, including active and pending stakes broken down by validator group
    • Parameters: address

18. get_activatable_stakes

    • Get information about pending stakes that can be activated for earning rewards
    • Parameters: address

19. get_validator_groups

    • Get information about all validator groups, including their members, votes, capacity, and performance metrics
    • No parameters required

20. get_validator_group_details

    • Get detailed information about a specific validator group including its members and performance data
    • Parameters: group_address

21. get_total_staking_info

    • Get network-wide staking information including total votes and participation metrics
    • No parameters required

Faucet Operations

Both faucet tools are testnet-only and require CELO_MCP_FAUCET_API_KEY (see Faucet access below).

22. request_faucet_funds

    • Request testnet CELO for an address. Returns the payout transaction hash if it lands while the request is open, otherwise a request_key to poll with
    • Sends 3 CELO per request, and CELO only — no USDm or other stablecoins
    • Parameters: beneficiary, optional network (celo-sepolia), optional wait (default true)

23. get_faucet_request_status

    • Check whether a queued faucet request has paid out
    • Parameters: request_key, optional network (celo-sepolia)

Faucet access

The faucet's browser flow is gated on reCAPTCHA v3, which scores headless callers badly, so the faucet tools use its API-key path instead. Create a key at faucet.celo.org/keys (sign in with GitHub; up to 2 keys, 90-day expiry) and set it in your MCP client's env block:

{
  "mcpServers": {
    "celo-mcp": {
      "command": "uvx",
      "args": ["celo-mcp"],
      "env": { "CELO_MCP_FAUCET_API_KEY": "cfk_..." }
    }
  }
}

The key is read from the environment and never passed as a tool argument, so it does not enter the model's context or the conversation transcript.

Limits are set by the faucet, not by this server: 10 requests per 24 hours, counted per GitHub account and per beneficiary address — holding two keys does not double the allowance. Global daily and 10-minute burst ceilings apply across all keys on top of that. celo-sepolia (chain ID 11142220) is the only supported network; there is no mainnet faucet.

The faucet publishes its API contract at openapi.json and llms-full.txt; treat those as the source of truth if amounts or limits change.

Deployment note: the HTTP transport is open unless MCP_AUTH_TOKEN is set. Only configure a faucet key for stdio or authenticated deployments — otherwise anyone reaching /mcp can spend your daily allowance on arbitrary addresses, and the key can be revoked for abuse.

Key Features

Token Support

• ERC20 Standard: Full support for ERC20 tokens
• Mento Stable Tokens: Built-in support for USDm, EURm and BRLm (formerly cUSD, cEUR and cREAL), plus XOFm, KESm, PHPm, COPm and GHSm
• Balance Queries: Get token balances with proper decimal formatting
• Token Information: Retrieve name, symbol, decimals, and total supply

NFT Support

• Multi-Standard: Support for both ERC721 and ERC1155 standards
• Automatic Detection: Automatically detects NFT standard using ERC165
• Metadata Fetching: Retrieves and parses NFT metadata from URIs
• IPFS Support: Built-in IPFS gateway support for metadata
• Collection Information: Get collection-level information

Smart Contract Interactions

• Function Calls: Call read-only contract functions
• Gas Estimation: Estimate gas costs for contract interactions
• ABI Management: Parse and manage contract ABIs
• Event Handling: Retrieve and decode contract events
• Transaction Building: Build contract transactions

Transaction Management

• Gas Estimation: Accurate gas estimation for transactions
• EIP-1559 Support: Modern fee structure with base fee and priority fee
• Transaction Simulation: Simulate transactions before execution
• Fee Calculation: Dynamic fee calculation based on network conditions

Governance Support

• Proposal Management: Retrieve and analyze Celo governance proposals
• Voting Data: Access proposal voting history and results
• Metadata Integration: Fetch proposal metadata from GitHub repositories
• Pagination Support: Efficiently browse through large sets of proposals

Staking Support

• Staking Balances: View active and pending stakes by validator group
• Activation Tracking: Check which pending stakes can be activated
• Validator Information: Comprehensive validator and validator group data
• Performance Metrics: Validator scores, election status, and capacity
• Network Statistics: Total voting power and staking participation

Development

Running Tests

# Install development dependencies
pip install -e ".[dev]"

# Run tests
pytest

# Run with coverage
pytest --cov=celo_mcp

Code Quality

# Format code
black src/
isort src/

# Lint code
flake8 src/
mypy src/

Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests for new functionality
5. Ensure all tests pass
6. Submit a pull request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Support

For questions, issues, or contributions, please:

1. Check the existing issues on GitHub
2. Create a new issue with detailed information
3. Join the community discussions

Acknowledgments

• Built on the Model Context Protocol (MCP) framework
• Uses Web3.py for Ethereum/Celo blockchain interactions
• Supports the Celo ecosystem and its stable token infrastructure