TL;DR for Agents: This skill lets you trade tokens with humans or other agents on Solana. You create a room, both parties deposit tokens to escrow, confirm, and execute an atomic swap. No trust required - it's all on-chain.

When to Use This Skill

• Trading tokens P2P - Swap any SPL token directly with another party
• Agent-to-agent commerce - Two AI agents can negotiate and execute trades autonomously
• Large OTC deals - Avoid slippage from DEX trades by going direct
• Protected trades - Use lockups to prevent counterparty from dumping immediately
• Multi-token swaps - Trade up to 4 tokens per side in one atomic transaction

Quick Start for Agents

1. Initialize (requires wallet)

import { PoseidonOTC } from 'poseidon-otc-skill';
const client = new PoseidonOTC({
  burnerKey: process.env.POSEIDON_BURNER_KEY  // base58 private key
});

2. Create a Trade Room

const { roomId, link } = await client.createRoom();
// Share link with counterparty or another agent

3. Wait for Counterparty & Set Offer

// Check room status
const room = await client.getRoom(roomId);
// Set what you're offering (100 USDC example)
await client.updateOffer(roomId, [{
  mint: 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v',  // USDC mint
  amount: 100000000,  // 100 USDC (6 decimals)
  decimals: 6
}]);

4. Confirm & Execute

// First confirmation = "I agree to these terms"
await client.confirmTrade(roomId, 'first');
// After deposits, second confirmation
await client.confirmTrade(roomId, 'second');
// Execute the atomic swap
const { txSignature } = await client.executeSwap(roomId);

Complete Trade Flow

┌─────────────────────────────────────────────────────────────────┐
│                        TRADE LIFECYCLE                          │
├─────────────────────────────────────────────────────────────────┤
│                                                                 │
│  1. CREATE ROOM                                                 │
│     └─> Party A calls createRoom()                              │
│         Returns: roomId, shareable link                         │
│                                                                 │
│  2. JOIN ROOM                                                   │
│     └─> Party B calls joinRoom(roomId)                          │
│         Room now has both participants                          │
│                                                                 │
│  3. SET OFFERS                                                  │
│     └─> Both parties call updateOffer(roomId, tokens)           │
│         Each specifies what they're putting up                  │
│                                                                 │
│  4. FIRST CONFIRM (agree on terms)                              │
│     └─> Both call confirmTrade(roomId, 'first')                 │
│         "I agree to swap my X for your Y"                       │
│                                                                 │
│  5. DEPOSIT TO ESCROW                                           │
│     └─> Tokens move to on-chain escrow                          │
│         (Handled by frontend or depositToEscrow)                │
│                                                                 │
│  6. SECOND CONFIRM (verify deposits)                            │
│     └─> Both call confirmTrade(roomId, 'second')                │
│         "I see the deposits, ready to swap"                     │
│                                                                 │
│  7. EXECUTE SWAP                                                │
│     └─> Either party calls executeSwap(roomId)                  │
│         Atomic on-chain swap via relayer                        │
│         Returns: txSignature                                    │
│                                                                 │
│  [OPTIONAL] LOCKUP FLOW                                         │
│     └─> Before step 4, Party A can proposeLockup(roomId, secs)  │
│     └─> Party B must acceptLockup(roomId) to continue           │
│     └─> After execute, locked tokens claimed via claimLockedTokens │
│                                                                 │
└─────────────────────────────────────────────────────────────────┘

API Reference

Room Management

Trading

Lockups (Anti-Dump)

Utility

WebSocket Real-Time Updates

Don't poll. Subscribe.

Instead of repeatedly calling getRoom(), connect to WebSocket for instant updates:

Endpoint: wss://poseidon.cash/ws/trade-room

Subscribe to Room Events

const { unsubscribe } = await client.subscribeToRoom(roomId, (event) => {
  switch (event.type) {
    case 'join':
      console.log('Counterparty joined!');
      break;
    case 'offer':
      console.log('Offer updated:', event.data.tokens);
      break;
    case 'confirm':
      console.log('Confirmation received');
      break;
    case 'execute':
      console.log('Swap complete! TX:', event.data.txSignature);
      break;
    case 'cancel':
      console.log('Trade cancelled');
      break;
  }
});

Event Types

WebSocket Actions (Faster than HTTP)

await client.sendOfferViaWs(roomId, tokens);      // Update offer
await client.sendConfirmViaWs(roomId, 'first');   // Confirm
await client.sendLockupProposalViaWs(roomId, 3600); // Propose 1hr lock
await client.sendAcceptLockupViaWs(roomId);       // Accept lock
await client.sendExecuteViaWs(roomId);            // Execute swap

Agent-to-Agent Trading Example

Scenario: Agent A wants to sell 1000 USDC for 5 SOL to Agent B

Agent A (Seller):

// 1. Create room
const { roomId } = await client.createRoom();
// 2. Set offer (1000 USDC)
await client.updateOffer(roomId, [{
  mint: 'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v',
  amount: 1000000000,  // 1000 USDC
  decimals: 6
}]);
// 3. Share roomId with Agent B via your inter-agent protocol
// 4. Subscribe to updates
await client.subscribeToRoom(roomId, async (event) => {
  if (event.type === 'offer') {
    // Check if Agent B's offer is acceptable (5 SOL)
    const room = await client.getRoom(roomId);
    if (room.partyBTokenSlots?.[0]?.amount >= 5 * 1e9) {
      await client.confirmTrade(roomId, 'first');
    }
  }
  if (event.type === 'confirm' && room.partyBFirstConfirm) {
    await client.confirmTrade(roomId, 'second');
  }
});

Agent B (Buyer):

// 1. Join the room
await client.joinRoom(roomId);
// 2. Set offer (5 SOL)
await client.updateOffer(roomId, [{
  mint: 'So11111111111111111111111111111111111111112',  // wSOL
  amount: 5000000000,  // 5 SOL
  decimals: 9
}]);
// 3. Subscribe and react
await client.subscribeToRoom(roomId, async (event) => {
  if (event.type === 'confirm') {
    const room = await client.getRoom(roomId);
    if (room.partyAFirstConfirm && !room.partyBFirstConfirm) {
      await client.confirmTrade(roomId, 'first');
    }
    if (room.partyASecondConfirm && room.partyBSecondConfirm) {
      // Both confirmed, execute!
      await client.executeSwap(roomId);
    }
  }
});

Common Token Mints

Environment Variables

POSEIDON_BURNER_KEY=  # Required for autonomous mode
POSEIDON_API_URL=https://poseidon.cash    # API endpoint (default: mainnet)
POSEIDON_RPC_URL=https://api.mainnet-beta.solana.com  # Solana RPC

Security Notes

• Escrow is on-chain - Funds are held by the Solana program, not the API
• Atomic swaps - Either both sides complete or neither does
• Signatures expire - Auth signatures valid for 24 hours
• Lockups are enforced on-chain - Can't bypass the timer
• Hot wallet warning - Only fund your burner wallet with amounts you're comfortable risking

Program ID

Mainnet: AfiRReYhvykHhKXhwjhcsXFejHdxqYLk2QLWnjvvLKUN

Links

• Website: https://poseidon.cash
• Docs: https://docs.poseidon.cash