Crossmint Wallet Plugin

Solana wallet integration for OpenClaw agents using Crossmint smart wallets with delegated signing.

Overview

This plugin enables OpenClaw agents to:

• Generate and manage local Solana signing keys (ed25519)
• Use Crossmint smart wallets on Solana
• Check wallet balances (SOL, USDC, SPL tokens)
• Send tokens to other addresses
• Buy products from Amazon with SOL or USDC

The key innovation is delegated signing: the agent holds its own private key locally, and users authorize the agent to operate their Crossmint wallet through a web-based delegation flow.

Installation

openclaw plugins install @crossmint/openclaw-wallet

Configuration

Enable the plugin in ~/.openclaw/.openclaw.json5:

{
  plugins: {
    entries: {
      "openclaw-wallet": {
        enabled: true
      }
    }
  }
}

Note: This plugin uses Solana mainnet (production) for real transactions.

Usage

Setting Up a Wallet (3-Step Process)

Step 1: Generate keypair and get delegation URL

Ask the agent: "Set up my Crossmint wallet"

The agent will:

1. Generate a local Solana keypair (ed25519)
2. Provide a delegation URL: https://www.lobster.cash/configure?pubkey=<your-public-key>

Step 2: Complete setup on the web app

1. Open the delegation URL in your browser
2. The web app will:
   • Create a Crossmint smart wallet on Solana
   • Add the agent's public key as a delegated signer
   • Show you the wallet address and API key

Step 3: Configure the agent

Tell the agent: "Configure my wallet with address X and API key Y"

The agent will use crossmint_configure to save these credentials securely.

Checking Balance

Ask the agent: "What's my wallet balance?"

Sending Tokens

Ask the agent: "Send 10 USDC to "

The agent will:

1. Confirm the recipient and amount
2. Sign the transaction locally using ed25519
3. Submit to Crossmint for execution on Solana

Buying from Amazon

Ask the agent: "Buy me this Amazon product: B00O79SKV6"

The agent will:

1. Ask for shipping address if not provided
2. Create an order with Crossmint
3. Sign the payment transaction locally
4. Submit the payment and confirm on-chain
5. Return the order ID and Solana explorer link

Example purchase flow:

User: "Buy B00O79SKV6 and ship to John Doe, 123 Main St, New York NY 10001"

Agent: ✅ Purchase complete!

Product: AmazonBasics USB Cable
Price: 0.05 SOL
Order ID: order_abc123
Payment: completed

Transaction: https://explorer.solana.com/tx/5x...

Use crossmint_order_status to check delivery status.

Tools

Tool	Description
crossmint_setup	Generate Solana keypair and get delegation URL
crossmint_configure	Save wallet address and API key from web app
crossmint_balance	Check wallet balances (SOL, USDC, SPL tokens)
crossmint_send	Send tokens to another Solana address
crossmint_wallet_info	Get detailed wallet information
crossmint_tx_status	Check transaction status
crossmint_buy	Buy products from Amazon with SOL or USDC
crossmint_order_status	Check Amazon order/delivery status

Amazon Purchase Flow

When you use crossmint_buy, the plugin executes a complete delegated signer flow:

┌─────────────────────────────────────────────────────────────┐
│  1. Create Order                                            │
│     POST /orders → Returns serialized payment transaction   │
├─────────────────────────────────────────────────────────────┤
│  2. Create Transaction                                      │
│     POST /wallets/{address}/transactions                    │
│     → Returns approval message to sign                      │
├─────────────────────────────────────────────────────────────┤
│  3. Sign Approval (Local)                                   │
│     Agent signs message with ed25519 keypair                │
├─────────────────────────────────────────────────────────────┤
│  4. Submit Approval                                         │
│     POST /wallets/{address}/transactions/{id}/approvals     │
├─────────────────────────────────────────────────────────────┤
│  5. Wait for Broadcast                                      │
│     Poll until on-chain txId is available                   │
├─────────────────────────────────────────────────────────────┤
│  6. Confirm Payment (CRITICAL)                              │
│     POST /orders/{orderId}/payment                          │
│     → Notifies Crossmint that payment is on-chain           │
└─────────────────────────────────────────────────────────────┘

All steps are handled automatically by the plugin.

Architecture

┌─────────────────────────────────────────────────────────────┐
│                        OpenClaw Agent                        │
├─────────────────────────────────────────────────────────────┤
│  Local Solana Keypair (ed25519)                             │
│  - Private key stored at ~/.openclaw/crossmint-wallets/     │
│  - Signs transaction approvals locally                      │
│  - Wallet address + API key stored after web setup          │
└────────────────────────┬────────────────────────────────────┘
                         │
                         ▼
┌─────────────────────────────────────────────────────────────┐
│              Delegation Web App (lobster.cash)               │
├─────────────────────────────────────────────────────────────┤
│  - Receives agent's public key via URL                      │
│  - Creates Crossmint smart wallet                           │
│  - Adds agent as delegated signer                           │
│  - Returns wallet address + API key to user                 │
└────────────────────────┬────────────────────────────────────┘
                         │
                         ▼
┌─────────────────────────────────────────────────────────────┐
│                    Crossmint Smart Wallet                    │
├─────────────────────────────────────────────────────────────┤
│  - Deployed on Solana                                       │
│  - Agent's address registered as delegated signer           │
│  - User retains admin control                               │
│  - Holds SOL/USDC for purchases and transfers               │
└─────────────────────────────────────────────────────────────┘

Security

• Private keys are stored locally on the agent's machine with secure file permissions (0600)
• Keys are never transmitted to Crossmint - only signatures
• Uses ed25519 cryptography (Solana native)
• API key is stored locally after user retrieves it from web app
• Users maintain admin control and can revoke delegation at any time
• The agent can only perform actions explicitly authorized through delegation

Troubleshooting

"No wallet found for agent"

• Run crossmint_setup first to generate a keypair

"Wallet not fully configured"

• Complete the web setup flow at the delegation URL
• Run crossmint_configure with wallet address and API key from the web app

"Failed to get balance" or "Failed to send"

• Verify the API key is correct (should start with ck_production_)
• Check that the wallet address matches the one shown in the web app
• Ensure the wallet has sufficient balance

"Insufficient funds" (Amazon purchase)

• Check balance with crossmint_balance
• Fund the wallet with more SOL or USDC
• Fund the wallet with real SOL or USDC on Solana mainnet

"Timeout waiting for transaction to be broadcast"

• Check transaction status with crossmint_tx_status
• Solana network may be congested - wait and retry

Plugin Management

# Install the plugin
openclaw plugins install @crossmint/openclaw-wallet

# Upgrade to latest version
openclaw plugins update @crossmint/openclaw-wallet

# List all plugins
openclaw plugins list

# Check plugin info (shows current version)
openclaw plugins info openclaw-wallet

# Enable/disable
openclaw plugins enable openclaw-wallet
openclaw plugins disable openclaw-wallet

# Uninstall
openclaw plugins uninstall openclaw-wallet

Supported Currencies

Currency	Token	Use Cases
SOL	Native Solana	Transfers, Amazon purchases
USDC	USD Coin	Transfers, Amazon purchases
SPL tokens	Any mint address	Transfers only