Most Polymarket bots stalled on April 28 when the CLOB V2 transition mandated a shift to deterministic deposit wallets and ERC-1271 signatures. Missing the “sync balance” step or misconfiguring Signature Type 3 is currently costing developers thousands in missed fill alpha. Here is the definitive migration map for 2026.
The transition to Polymarket V2 represents more than just a routine update. It is a fundamental architectural shift designed to solve one of the most persistent issues in the prediction market’s history: “ghost fills.” If you have been running bots on the platform for any length of time, you likely know the frustration of an order appearing to fill on the Central Limit Order Book (CLOB) only for the balance to remain unchanged due to a failure in the legacy proxy wallet system.
By moving to deterministic deposit wallets and the new POLY_1271 signature type, Polymarket is drastically improving stability for liquidity providers. However, for bot operators, this means the old ways of funding and signing are no longer viable for new accounts. To keep your strategies running in 2026, you need to master a new set of relayer transactions and signature wrapping techniques.
What changed on April 28 and May 4?
The migration began in earnest on April 28, 2026, with the production rollout of deposit wallets for all new API users. While existing users with established proxy or Safe setups are currently unaffected, anyone spinning up new trading accounts must adopt the V2 flow immediately.
Following the initial rollout, a technical patch was implemented on May 4 to address community feedback regarding relayer URL stability and signature validation. This patch fine-tuned how the CLOB processes the new smart account signatures, ensuring that the transition to the V2 infrastructure remains robust under heavy load.
The core of this change is the replacement of the V1 proxy and Safe onboarding flow. In the previous iteration, developers often struggled with “ghost fills,” where the relayer would accept an order that the on-chain contracts would later reject. The new deposit wallet architecture uses deterministic addresses derived from your owner Externally Owned Account (EOA), ensuring that the CLOB can verify balances and allowances with near-perfect accuracy before an order is ever matched.
It is important to distinguish between the user types. If you have an active bot using a legacy Safe or proxy wallet, your code will continue to work for now. However, for any new deployments, the Deposit Wallet Migration Guide is your mandatory reading. The era of the “ghost fill” is ending, replaced by a more stable, albeit more technically demanding, infrastructure.
The big picture: 5 steps to migrate your Polymarket bot
Migrating your bot to V2 is not an overnight task, but it can be broken down into five logical phases. Each step is critical; skipping even one (especially Step 4) will result in rejected orders and failed execution.
Step 1: Deploy the deposit wallet
Unlike the old flow where you might have manually deployed a Safe or interacted with a legacy proxy factory, V2 uses the relayer WALLET-CREATE endpoint. This transaction creates an ERC-1967 proxy wallet for the user. One major advantage here is that the deposit wallet address is deterministic. You can derive your wallet address before even sending the deployment transaction, which is helpful for pre-funding or organizing your bot farms.
Step 2: Fund the right address
This is where many developers are currently tripping up. In V2, your pUSD (PolyUSD) must reside directly in the deterministic deposit wallet address. pUSD held in your owner EOA (the key you use to sign) no longer counts toward your buying power on the CLOB. You must transfer your collateral to the specific wallet address derived in Step 1.
Step 3: Execute wallet batches
Approvals and collateral actions are no longer handled via standard EOA transactions. Instead, you must use the Relayer WALLET endpoint to execute a wallet batch. Whether you are approving pUSD for the exchange or merging conditional tokens, these calls must be bundled into a batch and signed by your owner account to be executed by the deposit wallet.
Step 4: Sync balance and allowance
Perhaps the most overlooked step in the entire migration is the mandatory update call to the CLOB. After funding your wallet or changing allowances, you must hit the /balance-allowance/update endpoint using signature_type = 3. Without this manual sync, the CLOB cache will not recognize your new funds, and your orders will be rejected for insufficient balance despite the on-chain reality.
Step 5: Place orders with POLY_1271
The final piece of the puzzle is the implementation of the POLY_1271 signature type. When posting an order to the /order endpoint, your signatureType must be set to 3. Crucially, both the maker and signer fields in the order payload must be set to your deposit wallet address.
Deep tech: Implementing Signature Type 3 (POLY_1271)
The shift to POLY_1271 is more than a simple flag change; it requires a new way of wrapping signatures. Polymarket now uses ERC-1271 validation, which allows smart contracts (like your deposit wallet) to verify signatures just like an EOA would. This is the new standard for professional liquidity providers because it offers a higher degree of security and flexibility for automated trading.
ERC-1271 and the ERC-7739 wrapper
When you sign an order in V2, your owner EOA is not signing the order directly in the way you might be used to. Instead, you are creating an ERC-7739-wrapped signature. This wrapper allows the deposit wallet to “confirm” that it authorizes the order.
If you are using the official SDKs, much of this complexity is handled for you. However, direct API users need to be aware that the signature field in the /order request is longer than a standard 65-byte ECDSA signature because it contains the data necessary for the smart account to perform its internal validation logic.
SDK implementation across languages
Polymarket has released updated versions of its core clients to support the V2 era. Depending on your stack, you should ensure you are on the latest versions:
- TypeScript: Use
@polymarket/clob-client-v2(v1.0.3-canary.0 or later) and@polymarket/builder-relayer-client. - Python: The
py-clob-client-v2(v1.0.1rc1) andpy-builder-relayer-clientare now available on PyPI. - Rust: The
polymarket_client_sdk_v2(v0.6.0-canary.1) includes support for thePoly1271signature type.
Let’s break it down. For a TypeScript implementation, initializing the client with a deposit wallet looks like this:
const clob = new ClobClient({
host: process.env.CLOB_API_URL,
chain: chainId,
signer: walletClient,
creds,
signatureType: SignatureTypeV2.POLY_1271,
funderAddress: depositWalletAddress,
});By specifying POLY_1271 and the funderAddress, the SDK automatically handles the signature wrapping and sets the correct maker and signer fields. If you are building a Polymarket bot on a VPS, using these updated SDKs is the fastest way to regain connectivity after the April 28 rollout.
Community feedback and V2 troubleshooting
The weeks following the April 28 rollout and the May 4 technical patch have provided a wealth of “battlefield” data from the developer community. While the V2 architecture is objectively more stable, the transition has not been without its friction points.
The “Missing Allowance” trap
One of the most frequent complaints on Discord and X involves missing allowances. Developers who are used to the V1 flow often attempt to call approve() from their owner EOA to authorize pUSD spending. This fails in V2 because the collateral is held by the deposit wallet, not the EOA. You must submit approval calldata through a relayer WALLET batch so that the wallet is the one granting permission to the exchange.
Ghost fills and balance sync
While V2 was built to eliminate ghost fills, a similar-looking issue persists for those who skip the balance sync. If you deposit pUSD into your wallet but fail to call the /balance-allowance/update endpoint with signature_type = 3, the CLOB will continue to think you have zero balance. This leads to immediate order rejections that can look like the old V1 stability issues, but they are actually a result of an unsynced cache.
Relayer latency and rejection
During the May 4 update cycle, some users reported a slight increase in signature rejection rates. This was often tied to using outdated relayer URLs or failing to fetch the WALLET nonce fresh before each batch. Always ensure your bot is polling the latest nonce from the relayer to avoid replay protection triggers or sequence errors.
Why Dublin hub is your edge in the V2 era
In a market where milliseconds often determine who captures the arb and who gets left with a stale fill, your infrastructure is just as important as your code. Polymarket’s core API infrastructure is strategically positioned, and at TradoxVPS, we have built our Dublin hub specifically to provide an edge for V2 traders.
Proximity and ultra-low latency
Our Dublin infrastructure delivers a verifiable ~0.5ms latency to the Polymarket hub. In the V2 environment, where signature validation is more computationally intensive due to the ERC-1271 wrapping, every microsecond saved in network transit is a microsecond your bot can spend on calculation. Hosting your migration-ready bot in the same region as the Polymarket relayer minimizes the risk of your signatures expiring or your orders being beaten by the competition.
Hardware superiority with Ryzen 9950X
The complexity of POLY_1271 signatures requires high-frequency processing to maintain throughput. We leverage the AMD Ryzen 9 9950X (Zen 5) architecture because its high clock speeds (up to 5.7GHz) are the best for trading VPS environments. While standard cloud providers often use throttled server-grade CPUs with lower single-thread performance, our Ryzen-based systems ensure your bot can generate complex signatures and process order book updates without hitting a CPU bottleneck.
Dublin-optimized VPS plans
To successfully operate Polymarket V2 migration trading bots, you need infrastructure that can handle the increased computational load of ERC-7739 signatures while maintaining sub-millisecond proximity to the relayer.
Our Dublin VPS plans are designed specifically for these requirements:
| Plan | Price | Cores | RAM | SSD |
|---|---|---|---|---|
| Starter | $44.9/mo | 2x Ryzen 9950X | 4GB DDR5 | 75GB NVMe |
| Active | $79.9/mo | 4x Ryzen 9950X | 8GB DDR5 | 150GB NVMe |
| Advanced | $129.9/mo | 6x Ryzen 9950X | 16GB DDR5 | 250GB NVMe |
| High Performance | $229.9/mo | 8x Ryzen 9950X | 32GB DDR5 | 500GB NVMe |
Redundancy and uptime
Trading on Polymarket is a 24/7 endeavor, especially during high-volatility events. We provide a 99.999% uptime guarantee through redundant enterprise hardware and Path.net DDoS protection. This ensures that your arbitrage farms stay online to capture volume even when the network is under stress.
Choosing the right infrastructure for your Polymarket bot
The Polymarket V2 migration is a significant milestone that brings much-needed stability to the prediction market ecosystem. By implementing deposit wallets, mastering POLY_1271 signatures, and ensuring your balance sync logic is correct, you are positioning your bot for long-term success in 2026.
But code is only half the battle. To truly scale your operations and eliminate the execution risk that comes with high-latency connections, you need infrastructure built for the task. We offer premium hardware without the premium markup, giving you the Ryzen 9950X edge in the Dublin hub.
Bottom line? Don’t let your V2 bot run on V1 hardware.
Ready to optimize your execution? Check out our Polymarket-optimized VPS plans and deploy your migration-ready bot in our Dublin hub today.
Frequently Asked Questions
If your bot is using an existing proxy or Safe wallet, you are currently unaffected. However, all new API users and new bot deployments must use the deposit wallet flow introduced in the Polymarket V2 migration.
The most common error is failing to call the balance sync endpoint with signature type 3. Even with a funded wallet, your Polymarket V2 migration trading bots will see “insufficient balance” errors if the CLOB cache is not manually updated.
Yes, pUSD (PolyUSD) remains the core collateral. However, for Polymarket V2 migration trading bots, this collateral must be held in the deposit wallet address rather than the owner EOA.
Because V2 signatures are more complex to generate and validate, network latency becomes a critical factor. Hosting Polymarket V2 migration trading bots in a Dublin hub with sub-1ms latency ensures your orders reach the relayer before the market moves.
You must update to the latest “V2” versions of the official SDKs. For example, TypeScript users need the canary versions of the CLOB client to support the specific signatures required by Polymarket V2 migration trading bots.
The primary benefit is the elimination of ghost fills. By using deterministic deposit wallets, Polymarket V2 migration trading bots enjoy much higher order stability and execution reliability compared to the old proxy system.
While we offer global coverage, we strongly recommend our Dublin hub for Polymarket V2 migration trading bots to achieve the lowest possible latency to the Polymarket API infrastructure.
