b402 Private DeFi

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name: b402-private-defi version: 0.4.2 description: > Private DeFi for AI agents. Shield tokens into a Railgun ZK privacy pool, swap privately, lend into Morpho vaults for yield, and bridge cross-chain via LI.FI — all gasless and untraceable. Supports Base, Arbitrum, BSC. author: b402ai homepage: https://github.com/b402-ai/b402-sdk metadata: openclaw: requires: env: [WORKER_PRIVATE_KEY] bins: [node, npx] primaryEnv: WORKER_PRIVATE_KEY install: - kind: node package: b402-mcp bins: [b402-mcp] emoji: "\U0001F510" homepage: https://github.com/b402-ai/b402-sdk

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b402 — Private DeFi for AI Agents

Shield. Swap. Lend. Bridge. All private. All gasless.

b402 wraps Railgun's ZK privacy pool with an agent-friendly SDK and MCP server. On-chain observers see "RelayAdapt called a DEX" — not your wallet, not your strategy.

Install

npx b402-mcp@latest --claude

This generates a wallet at ~/.b402/wallet.json, patches your Claude Desktop config, and registers the MCP server. Fund the wallet with USDC on Base to start.

Tools

| Tool | What it does | |---|---| | check_pool_balance | Show shielded balances, wallet state, vault positions | | shield_usdc | Move USDC into the Railgun privacy pool (gasless) | | private_swap | Swap tokens inside the pool via ZK proof (USDC↔WETH, etc.) | | lend_privately | Deposit into Morpho vault from pool (~4-8% APY) | | redeem_privately | Withdraw from Morpho vault back to pool | | cross_chain_privately | Private cross-chain transfer or swap via LI.FI (Base→Arb, etc.) | | get_swap_quote | Preview swap rates without executing | | run_strategy | Multi-step: swap + lend + reserve in one call |

Example prompts

"Check my privacy pool balance"

"Shield 5 USDC into the pool"

"Swap 2 USDC to WETH privately"

"Privately send 1 USDC to 0xABC... on Arbitrum"

"Private cross-chain swap: 1 USDC from pool to ARB on Arbitrum, to 0xABC..."

"Lend 10 USDC in the steakhouse vault"

"Run a yield strategy: 30% WETH, 50% lend, 20% reserve"

How it works

Agent prompt → MCP tool call → b402-sdk
  → Railgun ZK proof (client-side, 10-30s)
  → RelayAdapt atomic tx (unshield → DeFi op → reshield)
  → On-chain: only RelayAdapt visible. No wallet linked.

Cross-chain: LI.FI routes through ~30 bridges + ~20 DEXes. Source and destination are unlinkable.

Supported chains

| Chain | ID | Privacy pool | Cross-chain | |---|---|---|---| | Base | 8453 | Yes (0% fee) | Source + dest | | Arbitrum | 42161 | Yes (0% fee) | Dest only (v1) | | BSC | 56 | Yes (0% fee) | Dest only (v1) |

SDK usage (for builders)

import { B402 } from '@b402ai/sdk'
const b402 = new B402({ privateKey: process.env.WORKER_PRIVATE_KEY! })
// Shield into privacy pool (gasless)
await b402.shieldFromEOA({ token: 'USDC', amount: '10' })
// Private swap inside pool
await b402.privateSwap({ from: 'USDC', to: 'WETH', amount: '5' })
// Private cross-chain (LI.FI routing)
await b402.privateCrossChain({
  toChain: 'arbitrum',
  fromToken: 'USDC',
  toToken: 'ARB',
  amount: '1',
  destinationAddress: '0x...',
})
// Private lend (Morpho vaults, 4-8% APY)
await b402.privateLend({ amount: '10', vault: 'steakhouse' })

Links

SDK: npmjs.com/package/@b402ai/sdk

MCP: npmjs.com/package/b402-mcp

Starter: github.com/b402-ai/b402-starter

Agent template: github.com/b402-ai/b402-agent-starter