# Kaspa MCP
MCP server for sending KAS on the Kaspa blockDAG.
## About Kaspa
[Kaspa](https://kaspa.org) is a fast, scalable Layer-1 cryptocurrency built on proof-of-work (PoW) and powered by the GHOSTDAG protocol — a novel consensus mechanism that extends Nakamoto's original design. Unlike traditional blockchains that discard competing blocks, GHOSTDAG allows parallel blocks to coexist and orders them within a Directed Acyclic Graph (blockDAG), enabling high throughput while preserving decentralization and security.
**Key Features:**
- **10 blocks per second** with sub-second finality (Crescendo upgrade, May 2025)
- **Proof of Work** using kHeavyHash algorithm
- **Fair launch** - no premine, no ICO, no token allocations
- **Decentralized** - runs on standard hardware
## Installation
```bash
npm install
npm run build
```
## Configuration
Set these environment variables:
| Variable | Required | Description |
|----------|----------|-------------|
| `KASPA_MNEMONIC` | Yes* | BIP39 mnemonic phrase (24 words) |
| `KASPA_PRIVATE_KEY` | Yes* | Hex-encoded private key (alternative to mnemonic) |
| `KASPA_NETWORK` | No | Network: `mainnet`, `testnet-10`, `testnet-11`. Defaults to `mainnet` |
| `KASPA_ACCOUNT_INDEX` | No | BIP44 account index when using mnemonic. Defaults to `0` |
*Either `KASPA_MNEMONIC` or `KASPA_PRIVATE_KEY` must be set.
## Usage with Claude Desktop
Add to your Claude Desktop config (`~/Library/Application Support/Claude/claude_desktop_config.json`):
```json
{
"mcpServers": {
"kaspa": {
"command": "npx",
"args": ["kaspa-mcp"],
"env": {
"KASPA_MNEMONIC": "your twenty four word mnemonic phrase here ...",
"KASPA_NETWORK": "mainnet"
}
}
}
}
```
## Tools
### `get_my_address`
Get the Kaspa address derived from your configured private key or mnemonic.
**Returns:** `{ address: string }`
### `get_balance`
Get balance for a Kaspa address.
**Parameters:**
- `address` (optional): Address to check. Defaults to your wallet address.
**Returns:** `{ address: string, balance: string, utxoCount: number }`
### `get_fee_estimate`
Get current fee estimates from the network.
**Returns:** `{ priorityFee: string, normalFee: string, lowFee: string }`
### `send_kaspa`
Send KAS tokens to a recipient.
**Parameters:**
- `to`: Recipient Kaspa address (must match wallet network)
- `amount`: Amount in KAS as string (e.g., "10.5", max 8 decimal places)
- `priorityFee` (optional): Priority fee in sompi
**Returns:** `{ txId: string, fee: string }`
**Validations:**
- Address format and network prefix validation
- Amount must be a valid positive decimal number
- Maximum 8 decimal places (1 sompi = 0.00000001 KAS)
- Insufficient balance check before broadcast
### `get_transaction`
Get transaction details including inputs and outputs.
**Parameters:**
- `txId`: Transaction ID
**Returns:**
```typescript
{
txId: string,
accepted: boolean,
blockHash?: string,
blockTime?: number,
inputs: Array<{ transactionId: string, index: number }>,
outputs: Array<{ index: number, amount: string, address: string }>
}
```
## Example
```
"Send 5 KAS to kaspa:qz..."
```
The MCP will:
1. Validate the recipient address matches your network
2. Check your balance is sufficient
3. Build the transaction with KIP-9 compliant fees
4. Sign with your private key
5. Broadcast to the network via public nodes
6. Return the transaction ID
## Technical Details
- Uses [kaspa-wasm](https://github.com/aspect-build/aspect-cli) for cryptographic operations
- Connects to public nodes via Resolver for automatic node discovery
- Implements BIP44 derivation path `m/44'/111111'/account'` for mnemonic wallets
- Transaction building uses Generator for KIP-9 compliant UTXO management
## Security
- Private keys and mnemonics are only used locally for signing
- Keys are never sent to any external service
- Error messages are sanitized to prevent secret leakage
- All transactions require explicit user action via MCP tools
## Networks
| Network | Address Prefix | API Endpoint |
|---------|---------------|--------------|
| `mainnet` | `kaspa:` | api.kaspa.org |
| `testnet-10` | `kaspatest:` | api-tn10.kaspa.org |
| `testnet-11` | `kaspatest:` | api-tn11.kaspa.org |
## License
ISC
