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Every public DeFi action tells people what wallet to watch. b402 puts the position on chain — not the wallet. Open-source infrastructure for agent payments and confidential DeFi. Live on Solana, Base, and BNB mainnet. Apache 2.0.

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Install for your agent

npx -y @b402ai/solana-mcp --install
One command writes b402 into Claude Code, Cursor, or Claude Desktop. Eleven tools — shield, unshield, private_swap, private_lend, private_redeem, quote_swap, status, balance, holdings, watch_incoming, wallet_balance. Mainnet defaults. No RPC config required. MCP overview →

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Or use it from code

import { B402Solana } from '@b402ai/solana';
import { PublicKey, Keypair } from '@solana/web3.js';

const USDC = new PublicKey('EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v');
const SOL  = new PublicKey('So11111111111111111111111111111111111111112');

const b402 = new B402Solana({ cluster: 'mainnet', keypair });
await b402.ready();
await b402.shield({ mint: USDC, amount: 1_000_000n });
await b402.swap({ inMint: USDC, outMint: SOL, amount: 1_000_000n });
npm install @b402ai/solana · npm install @b402ai/sdk Solana quickstart → · EVM quickstart →

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What’s live

LayerWhere
Solana shielded pool (Phase-9 dual-note)mainnet
Solana Jupiter adapter (private swap)mainnet
Solana Kamino adapter (per-user obligation)mainnet
Solana percolator adapter (perp open / close)devnet
Solana MCP server (@b402ai/[email protected])npm + mainnet defaults
EVM Facilitator V3 (HTTP-402 / x402)Base + BNB mainnet
EVM smart wallets (ERC-7579 Nexus)Base + BNB mainnet
EVM privacy pool (Railgun fork)Base mainnet
Same b402 program IDs on Solana devnet and mainnet. EVM contract addresses in each chain’s reference.

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Where to go next

Solana

Composable confidential DeFi. Shield USDC, then swap, lend, or perp through registered adapters — atomic, in one transaction.

EVM

HTTP-402 / x402 agent payments. Gasless. Multi-token. Smart wallets on Base and BNB.

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Build with us

  • Build an adapter — plug any Solana protocol into b402’s shielded pool. Open ABI, cpi-only security gate, per-user PDA pattern.
  • Facilitator API — HTTP API for verify, settle, smart-wallet ops, incognito payments.
  • Trust assumptions — what we ship today, what’s pending, why it matters.