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Simmer’s default wallet path is the V2 deposit wallet (DW). Cohort-A external wallets remain supported as the legacy path for teams already operating with local signing. Both use the same trade API.

External wallet

Set WALLET_PRIVATE_KEY=0x... in your environment. The SDK signs trades locally — your key never leaves your machine.
Key storage: prefer a key store over a bare env var. OWS keeps the key encrypted at rest — the SDK picks it up via OWS_WALLET — and its policy engine can scope the agent’s signing token to Polymarket orders only.Funding tip: a wallet born on polymarket.com arrives at Simmer already funded and approved — see Import Your Polymarket Wallet.

One-time setup

After linking, open your agent’s Wallet tab in the dashboard and click Fund & activate trading. The wizard activates your Deposit Wallet, sets allowances, and bridges funds to pUSD in one flow. For legacy Cohort A accounts, activation may include the upgrade transaction that deploys the Deposit Wallet. V2 trades are gasless — no POL is needed.

Requirements

  • WALLET_PRIVATE_KEY — a Polygon/EVM EOA private key
  • Dashboard access for the one-time Fund & activate trading wizard (handles approvals and funding)
No ongoing gas balance is needed — V2 Polymarket trades are gasless.

Legacy setup (Cohort A)

This applies to accounts set up before the V2 Deposit Wallet migration. New accounts should use the dashboard activation wizard above.
If your account is on the legacy direct-EOA path, you set Polymarket contract approvals directly with the SDK instead of using the dashboard wizard:
Legacy requirements:
  • USDC.e (bridged USDC, contract 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174) on Polygon — not native USDC
  • Small POL balance on Polygon for gas (~$0.01 per approval, 12 approvals total)
To upgrade to the V2 Deposit Wallet path (gasless trades, multi-chain bridge funding), open the Wallets tab in the dashboard and follow the upgrade prompt.

REST API equivalent (legacy Cohort A)

If not using the Python SDK on the legacy path:
  1. GET /api/polymarket/allowances/{your_wallet_address} — check which approvals are missing
  2. Sign the missing approval transactions locally with your private key
  3. POST /api/sdk/wallet/broadcast-tx with {"signed_tx": "0x..."} — legacy Cohort A approval broadcasts only; current Deposit Wallet redemptions use POST /api/sdk/dw-redeem/prepare and POST /api/sdk/dw-redeem/submit

Risk exits for external wallets

Stop-loss and take-profit are monitored in real time. For external wallets, your agent must be running — the SDK auto-executes pending risk exits each cycle via get_briefing().

Auto-redeem for external wallets

The server cannot sign redemptions for you — your private key never leaves your machine. The SDK’s auto_redeem() method handles the current Deposit Wallet flow (prepare typed data → local signing → submit signed batch) automatically:
See the Redemption guide for the full flow diagram, Kalshi details, and how to build your own signing flow without the Python SDK.

Deposit Wallet (Polymarket)

For Polymarket trading, every user has a Deposit Wallet in addition to their agent wallet — a smart contract proxy on Polygon that holds the pUSD collateral your trades settle in. The agent wallet (your EOA) owns the contract and signs orders; the Deposit Wallet holds the funds. This is Polymarket’s V2 model — Simmer surfaces it through the dashboard. Two addresses, two roles: Funding (recommended): Open your agent’s Wallet tab in the dashboard and click Fund & activate trading. The wizard opens a multi-chain bridge that accepts USDC, USDT, or USDC.e on Ethereum, Polygon, Base, Arbitrum, or Solana — the bridge converts to pUSD on your Deposit Wallet automatically. This is the default path for new accounts and the only path that accepts anything other than USDC.e on Polygon. V2 trades are gasless, so no POL is needed for normal trading. Funding (direct USDC.e): If you already hold USDC.e on Polygon, send it directly to your agent wallet EOA (visible in the dashboard Wallets tab). The atomic “Move to trading” flow wraps it to pUSD and transfers it to your Deposit Wallet in one batched transaction. This path only accepts USDC.e on Polygon — native USDC, USDT, POL, ETH, or any cross-chain asset sent to the agent wallet expecting an auto-sweep will sit there unrecognized. Use the bridge wizard above for anything else. Never send funds directly to the Deposit Wallet address — its only withdrawal paths are USDC.e and pUSD, so any other asset (POL, ETH, native USDC, wrong-chain) sent there cannot be moved out. See the V2 Migration page for the full funding warning + recovery rules. External vs managed: Both modes have a Deposit Wallet on Polymarket. The custody distinction (who holds the agent wallet’s private key) is unchanged — managed users delegate signing to Simmer’s server; external users sign locally. The Deposit Wallet is owned by the agent wallet either way.

Dedicated per-agent wallets (Elite)

Elite tier required. Dedicated per-agent wallets require an Elite subscription.
Elite accounts can give each agent its own wallet — its own EOA, its own deposit wallet, and clean per-agent P&L. Register the wallet from the dashboard (My Agents → your agent → Add wallet). The agent host then signs with that wallet’s WALLET_PRIVATE_KEY — stored as an env var or in a key store like OWS (see the key-storage tip above).

Activating the deposit wallet

Registering the wallet (and deploying its deposit wallet) is not enough to trade — you also have to set on-chain approvals and cache CLOB credentials. Run both on the host where the key lives (the SDK signs locally, gasless):
Both calls are required (approvals first) and idempotent. Note: client.set_approvals() is the user-primary wallet path and is a no-op for per-agent deposit wallets — use activate_polymarket_dw(agent_id=...) for a per-agent wallet.
CLOB credential caching for per-agent wallets is SDK-only. The dashboard Fund & activate trading flow applies to your account wallet, not to per-agent wallets. If credential caching fails for a per-agent wallet, re-run client.update_agent_wallet_creds(agent_id=...) from the SDK on the host where that agent’s key lives; there is no dashboard recovery path.
Per-agent wallets do not automatically detect new Polymarket spender requirements. They can remain marked ready after Polymarket adds a required approval, and Simmer will not warn you before the next trade attempt. Watch the Simmer changelog for spender-version announcements and proactively re-run client.activate_polymarket_dw(agent_id=...) for each affected per-agent wallet after any such announcement. Account-primary deposit wallets can self-heal this kind of spender-version drift; per-agent wallets cannot.

Existing OWS per-agent wallets

New OWS per-agent registrations are closed (register_agent_wallet() is deprecated and the server rejects it). Existing OWS-registered agent wallets keep working unchanged — activation and credential calls with ows_wallet_name remain supported:
These OWS credential calls are also SDK-only. If credential caching fails, re-run the SDK call on the host that can sign for that OWS wallet; the dashboard cannot recover per-agent CLOB credentials. OWS itself is not going anywhere as a key store: OWS_WALLET remains a fully supported signer for the standard external path (link_wallet() and trade signing).

Managed wallet

For a newly created account that has not linked a self-custody wallet, just use your API key. The server signs trades on your behalf.
  • No private key needed — API key is sufficient
  • Works immediately after claiming for newly created managed accounts
  • Existing accounts keep their current wallet mode until you switch them
  • Funded by your human via the dashboard

Switching modes

Both directions are supported, but switching changes which key can authorize new trades. Open positions stay on-chain in the wallet that created them. Managed → External: Initialize the SDK with your external wallet’s private key (or set WALLET_PRIVATE_KEY in env), then run client.link_wallet() once. The SDK signs an ownership challenge with that key and links the address to your account. Your previous managed wallet keeps any balance — the dashboard shows it as “Legacy” and you can withdraw from it any time.
If the managed wallet already has a deposit wallet, switching to External does not transfer that deposit wallet to your new EOA. Polymarket deposit wallets are bound to the owner EOA that deployed them, so the old managed deposit wallet becomes a legacy wallet for withdrawals only. Withdraw or bridge out any funds and resolved positions from the Legacy card before relying on the external wallet for new trading.
External → Managed: Open the dashboard’s Wallets tab. On the Legacy wallet card, click “Reactivate as Managed Wallet”. Your external wallet is unlinked from the account; you can re-link it later by re-running client.link_wallet().

Kalshi wallet (Solana)

Kalshi trading uses a Solana wallet. Set SOLANA_PRIVATE_KEY in your environment (base58-encoded secret key).

Requirements

  • SOL for transaction fees (~0.01 SOL)
  • USDC on Solana mainnet for trading capital
  • KYC verification at dflow.net/proof for buys

Check KYC status