The Bullpen referral code is bull20. Enter it when you sign up at app.bullpen.fi and you unlock cashback rebates plus up to 20% of your trading fees back on every trade you place through the terminal. Bullpen is a non-custodial onchain trading terminal that lets you trade Hyperliquid perpetuals and spot, Solana tokens, and Polymarket prediction markets from one screen, and the referral system is the platform's way of paying you back a slice of every fee you generate instead of routing that value to whichever wallet referred you.

Bull20 is a referral code tied to a specific invite link, bullpen.fi/@bull20. When you sign up through that link, or type bull20 into the referral field manually, Bullpen tags your account with it permanently. From that point on, the platform advertises that you get cashback rebates and up to 20% of your fees refunded on eligible trades across the terminal, whether you're trading Hyperliquid perps, spot assets, or routing orders through Jupiter Ultra for Solana tokens.

The "up to" matters. Bullpen doesn't publicly commit to a flat 20% on every single trade type or market condition; it's the ceiling the platform advertises for this code, and the actual rebate you see can depend on which product you're trading and what tier the referral program has you in at the time. Treat 20% as the headline the code unlocks, not a guaranteed number stamped on every fill.

Because Bullpen also runs a points program, bull20 doesn't just affect cash-back economics. Referral relationships can factor into how the platform credits activity toward $BULL points and other reward tracks tied to Hyperliquid XP and HyperUnit, since referred accounts are what the program is built to reward and retain. If your goal is farming points on Bullpen anyway, entering a code costs you nothing and only adds a fee discount on top of activity you were going to do regardless.

One practical note: referral codes on Bullpen are entered once, at signup, and there's no confirmed way to retroactively apply a code to an account that's already active without one. If you already have a Bullpen account with no code attached, don't assume bull20 will backdate itself onto your trading history.

Bullpen, also written BullpenFi, describes itself as a non-custodial trading terminal for onchain markets. Instead of building one product for one chain, it stitches together three separate venues into a single interface: Hyperliquid for perpetual futures and spot trading, Polymarket for prediction markets, and Solana for spot tokens routed through Jupiter Ultra. It also integrates HyperUnit, which handles bridging assets like BTC, ETH, and SOL onto Hyperliquid's spot markets for orderbook-style execution rather than AMM swaps.

The terminal is non-custodial by design. You connect your own wallet, and every order you place gets signed locally using an EIP-712 signature before it's routed to the relevant execution layer. Hyperliquid and Solana orders match onchain; Polymarket orders route through Polymarket's own CLOB on Polygon. Bullpen doesn't hold your assets in a company-controlled account the way a centralized exchange would. Instead, assets settle into a proxy wallet that you retain control over.

Beyond raw order execution, Bullpen layers in tools aimed at traders who want more context than a bare orderbook: a smart-money feed that surfaces what tracked wallets are doing, a whale activity tracker for large or unusual positions, wallet analytics under a feature the platform calls WalletScope, and copy-trading functionality so you can mirror trades from wallets you follow. There's also a CLI, separate from the web app, that lets you trade, check your portfolio, and pull market data from a terminal window with AI agent support, according to the platform's own documentation.

The project is publicly associated with Ansem (blknoiz06), a well-known figure in crypto trading and investing circles, who has described himself as a co-founder on social media. That association is part of why Bullpen has drawn early attention in the Hyperliquid ecosystem, but it doesn't substitute for doing your own diligence before connecting a funded wallet.

Entering bull20 takes under a minute if you do it at the right point in signup. Here's the sequence:

A few things trip people up here. First, the code field usually only appears once, during that initial signup flow, so don't skip past it assuming you can add it later from settings. Second, referral codes are typically case-sensitive on platforms like this, so stick to lowercase exactly as shown. Third, if you're on mobile, Bullpen runs as a mobile web app rather than a native app store download, so open the link in your phone's browser rather than searching an app store for it. If the field doesn't appear at all, refresh from the direct referral link before contacting support, since a stale cache is the most common reason a code fails to populate.

Referral codes on trading platforms come and go as programs get restructured, so treat any code, including bull20, as something to verify at the point you're about to sign up rather than something guaranteed to work indefinitely. The safest check is simple: open the referral link, bullpen.fi/@bull20, and see whether the signup flow accepts it and shows a referral field populated with the code before you connect a wallet.

On adding it after the fact, the honest answer is that there's no publicly confirmed way to attach a referral code retroactively once your account exists without one. Referral programs across this category of platform are built to attribute new users to a referrer at the moment of signup, and reversing or amending that after your first trade is generally not something the interface supports. If you've already made an account and skipped the code field, your best option is to check whether Bullpen's support channel or documentation has since added a way to update it, but don't count on it.

This is also why it's worth pausing before you connect a wallet for the first time, rather than rushing through setup and circling back. A referral code is one of the few pieces of a trading account you genuinely cannot fix later, whereas most other settings, like display preferences or notification options, can be changed at any point. If you're not sure whether you already have an account, check by connecting the same wallet you'd normally use before creating anything new, since Bullpen ties your account to your wallet address rather than an email or username.

The clearest way to see the value of bull20 is to compare the two paths side by side. The table below sets out what the platform advertises for an account created with the code against one created without any referral input.

The core takeaway is that bull20 doesn't unlock features you'd otherwise be blocked from. You can trade on Bullpen with or without a referral code, and the underlying terminal, its market access, and its points program work the same either way. What the code changes is the economics of trading: a portion of the fees you'd pay anyway comes back to you instead of staying with the platform in full. For anyone who plans to trade actively on Bullpen regardless, there's no real argument for skipping the code field, since it costs nothing to enter and only improves your fee outcome.

Bullpen doesn't set its own trading fees in isolation, because it's routing your orders to underlying venues, Hyperliquid, Polymarket's CLOB, and Solana via Jupiter Ultra, rather than matching trades on its own orderbook. Third-party coverage of the platform has cited trading fees in the range of roughly 0.02% to 0.05%, though this figure comes from outside reporting rather than an official published fee page, so treat it as a general indication rather than a locked-in number for every asset and order type.

The referral rebate sits on top of whatever base fee applies to your trade. When you've got bull20 attached to your account, the platform reduces your effective cost by refunding a share of that fee, up to the 20% ceiling advertised for this code, rather than charging you the full rate and separately crediting you later. Some third-party sources covering Bullpen's referral system more broadly have described tiered cashback structures that can run higher than 20% depending on the code or the volume tier involved, which suggests the program isn't flat across every referral relationship. Bull20's specific, advertised terms are cashback rebates plus up to 20% of fees back, and that's the number to hold the platform to for this particular code.

Because fees are denominated in whatever asset or margin currency the underlying venue uses, the rebate typically shows up as a reduction in what you pay rather than a separate token drop, at least based on how these programs are usually structured on similar terminals. If you're trading frequently, even a modest percentage rebate compounds meaningfully over weeks of activity, which is part of why active traders on Hyperliquid-adjacent platforms pay attention to referral codes at all rather than treating them as marketing noise.

Trading on Bullpen currently earns you more than just fee rebates. The platform runs a points system built around $BULL, and activity on the terminal can also count toward Hyperliquid's own XP program (reported as covering Season 2 and Season 3) and toward HyperUnit-related rewards, since Bullpen routes bridging and spot activity through that integration. Coverage of the platform has also referenced Polymarket rewards as a planned addition to this multi-farm structure, though that piece wasn't confirmed as live at the time of writing.

Here's the important caveat: there is no live $BULL token as things stand. Bullpen has acquired the $BULL ticker on Hyperliquid's spot market, which some observers have read as a signal that a token launch is being prepared, but that's speculation built on a ticker reservation, not a confirmed token generation event or date. No official token launch has been announced by the platform. Anyone farming points on Bullpen should treat the process as accumulating activity that may or may not convert into a future airdrop, not as a guaranteed reward sitting in a queue.

This distinction matters for how you should think about bull20 as well. The referral code's confirmed, tangible benefit is the fee rebate and cashback on trades you're already making. Any points or future token upside from trading on Bullpen is a separate, unconfirmed layer on top of that, and it shouldn't be the reason you trade more than you otherwise would. If you're going to use the platform, the discount from bull20 is real and immediate; the token speculation is not something to plan your trading size around.

Bullpen's pitch is consolidation. Rather than opening a separate interface for Hyperliquid perps, another for Polymarket, and a Solana-native app for spot tokens, Bullpen puts all three inside one terminal, alongside the smart-money tracking and copy-trading tools that some standalone Hyperliquid front-ends don't offer at all. That's a meaningful difference from single-purpose terminals that only handle perps or only handle spot, since it removes the friction of managing separate wallets or sessions across three different products.

Where Bullpen looks similar to other onchain terminals is in the non-custodial model itself. Plenty of Hyperliquid-focused front-ends are non-custodial and route signed orders to the same underlying exchange, so the core execution guarantees, your funds settling to your own wallet rather than a platform-held account, aren't unique to Bullpen. What differs is the surrounding feature set: the CLI with AI agent support, the multi-protocol points farming across Hyperliquid, HyperUnit, and prospectively Polymarket, and the copy-trading layer built around wallet tracking.

The tradeoff is that a newer, multi-product terminal carries a different risk profile than a single-purpose one that's been running longer on one chain. More moving parts, three separate underlying venues instead of one, means more places where routing, latency, or integration issues could show up. If your priority is the simplest possible path to trading Hyperliquid perps alone, a dedicated single-chain terminal might be a more direct fit. If you specifically want prediction markets, perps, and Solana spot trading without switching tabs, and you want a referral code that pays a chunk of your fees back while you do it, Bullpen with bull20 is built for exactly that use case.

Bullpen is aimed at people who already trade across more than one of its supported venues, Hyperliquid perps, Polymarket predictions, or Solana spot tokens, and who'd rather manage that from one interface than juggle three. It also suits traders interested in farming points across multiple protocols at once, since that's the explicit design goal the platform has built its multi-farm features around. If you only ever trade one asset class on one chain and have no interest in prediction markets or points programs, a lot of Bullpen's feature set won't be relevant to you.

It's a poor fit for anyone looking for a fully custodial, beginner-friendly experience with account recovery support if something goes wrong. Non-custodial means you hold your own keys and your own responsibility: there's no company standing behind your wallet the way a centralized exchange stands behind a custodial account, and mistakes like sending funds to the wrong address or losing wallet access aren't something Bullpen can reverse for you.

On risk specifically: trading perpetual futures and prediction markets carries real financial risk, and nothing about a referral code, a fee rebate, or a points program changes that. Cashback and fee discounts reduce your cost of trading; they don't reduce the risk that a trade goes against you, and they're not a guarantee of any return. The platform is also relatively new to the market compared with established centralized exchanges, so it doesn't carry the same multi-year track record. Do your own research on wallet security, only connect funds you're prepared to actively manage, and treat any points or future token expectations as speculative rather than something to size your trading around.

No. Other codes circulate online from different affiliates and can carry different advertised terms. Bull20's confirmed terms are cashback rebates plus up to 20% of fees back; verify any other code's terms independently before assuming it matches.

No. Entering a referral code at signup is free. It only changes your fee rebate and cashback terms; it doesn't add a charge or require a deposit to activate.

Bullpen runs as a mobile web app rather than a native app store download, so open bullpen.fi/@bull20 or app.bullpen.fi directly in your phone's browser and enter the code during the same signup flow used on desktop.

No. You enter the code during wallet-based signup, before funding anything. You can connect your wallet, apply bull20, and fund your account afterward, either with crypto or through the wire and ACH options the platform has advertised.

No. Referral status and points eligibility are separate. Trading on Bullpen counts toward $BULL points, Hyperliquid XP, and related rewards whether or not you signed up with a referral code.

There's no publicly confirmed way to add a referral code to an existing account. Enter it during your initial signup flow rather than planning to add it afterward.

No. Bullpen is a non-custodial terminal that routes your signed orders to Hyperliquid, Polymarket's CLOB, and Solana via Jupiter Ultra. You keep control of your wallet rather than depositing funds into a platform-held account.