Grok Dominates Coinbase’s AI Trading with a 60% Share: Which Coins Are Being Purchased?

Quick Read

• Grok dominates Coinbase’s AI agent trading with a 60% share, dwarfing Claude at 13%, custom tools at 22%, and ChatGPT at just 2%.

• Coinbase has disclosed which AI programs drive trades but refuses to reveal which coins those agents actually buy, making speculation unreliable.

• USDC dominates AI agent payments via Coinbase’s x402 standard, with Base network handling over 90% of 160 million processed transactions.

• Building a portfolio and living off one are two completely different skills, and almost nobody teaches the second. This problem is what The Definitive Guide to Retirement Income helps, and it is free today. Read more here. (Sponsor)

Grok, the AI chatbot created by Elon Musk’s xAI, has become the frontrunner in automated trading on Coinbase (NASDAQ: COIN). On September 25, 2026, Coinbase’s CEO Brian Armstrong announced that “Grok is the leading client for agentic traders on Coinbase currently.” Data shows that from September 14 to September 21, Grok accounted for about 60% of AI agent trading activity on the platform.

Traditionally, exchange executives refer to their clients as either retail investors or institutional traders. However, Armstrong broke from that norm by naming a chatbot, highlighting the significant role that software plays in executing orders on the largest U.S. crypto exchange. This raises a pressing question: what coins are these AI agents actually buying?

Grok Drove About 60% of AI Agent Trading on Coinbase

An “agentic trader” is essentially a program that receives a wallet and specific instructions to place trades automatically, without human approval for each transaction. Coinbase introduced this capability on June 11, 2026, when it launched “Coinbase for Agents.” This service allows AI tools to trade cryptocurrencies and derivatives within predefined spending limits set by their owners.

In the week of September 22, Coinbase even expanded this service to include U.S. stocks and ETFs.

——

Now Available: The Definitive Guide to Retirement Income

Many successful investors eventually reach the same moment. The saving is done, the portfolio is built, and the question quietly changes from how much can I grow this to how much can I take out? Get that second question wrong and decades of good investing can come apart in a handful of years.

That is exactly what The Definitive Guide to Retirement Income  helps answer. It covers what your retirement could actually cost, which income sources are worth using, and the withdrawal math that decides whether the money lasts. It is free today from Fisher Investments. Read More Here ›

——

According to the developer data labeled “Where agentic traders come from,” Grok holds a commanding lead with about a 60% share, well ahead of its competition. Custom command-line tools developed by users take second place with around a 22% share, followed by Claude at 13%, Perplexity at 3.5%, and ChatGPT at 1.5%. This distribution shows that Coinbase is already organizing agent trading activity by the AI programs that power them.

Cryptocurrency trading is uniquely suited for these automated agents, more so than the stock market. Unlike traditional markets, blockchains operate 24/7 with no closing times, allowing programs to confirm payments almost instantly. Additionally, agents can create their own self-custody wallets without the identity checks typically required for brokerage accounts.

Coinbase Has Not Said Which Coins Its AI Agents Buy

While Armstrong’s announcement and the developer data show which AI products are driving trading activity, they don’t specify which coins are being traded. As of now, Coinbase has not provided any information on how agent trading activity breaks down by specific cryptocurrencies. Consequently, any speculation about “AI agent coins” is guesswork rather than based on solid exchange data.

Everyone involved in this discussion has a vested interest. Armstrong leads an exchange that profits from trading fees, while Jordi Visser and Tillman Holloway, who shared their views on The Pomp Podcast, a crypto-focused show, advocate for broader adoption of cryptocurrencies. Their points of view offer insight but not definitive data on which assets the agents are actually trading.

However, Coinbase likely has the capability to shed light on this question. Since they categorize agent traders by AI program, they should also be able to categorize orders by coin if they choose to release that information.

AI Agents Pay for Online Services in USDC

The payment aspect of agent activity offers more clarity. Coinbase has implemented a payment standard called x402, enabling AI agents to pay websites and online services directly. Armstrong mentioned in June that this system had already processed over 160 million transactions, primarily settling in USDC, the U.S. dollar stablecoin issued by Circle (NYSE: CRCL). Coinbase’s Base network handles more than 90% of this transaction volume.

In April, Coinbase transferred control of the x402 standard to an independent foundation. By July, Ripple joined as a key member alongside major players like Visa and Mastercard. Ripple has connected XRP to Stripe’s agent payment system, but the reported activity related to x402 predominantly runs on USDC.

Additionally, the Ethereum Foundation is launching similar payment tools using USDC. On October 1, they introduced zkAPI on the Ethereum (CRYPTO: ETH) mainnet, allowing users to prepay USDC into a vault and pay for AI models using zero-knowledge proofs—an advanced form of cryptography that confirms a payment’s validity without revealing which deposit funded it.

Visser emphasizes the need for speed in transaction settlements. He pointed out that longer settlement times can create opportunities for “agent swarms”—groups of coordinated bots that could potentially capitalize on delays. The Base network confirms transfers in about two seconds, closely aligning with Visser’s target of instant processing.

What Coins Are AI Agents Buying on Coinbase?

Despite Grok’s strong presence in AI trading, the specific cryptocurrencies it buys remain a mystery, as Coinbase has not disclosed this information. While payments are primarily made in USDC, there’s still no concrete evidence of which tokens AI agents favor. Thus, any claim that a coin is a preferred choice among agents relies more on speculation than on confirmed exchange data.

Until Coinbase publishes that breakdown, can AI agent trading lift any coin beyond USDC?

Released: The Definitive Guide to Retirement Income

(Sponsor) Most people spend their entire working lives focusing on one thing: growing a pile of money. Then they retire and discover the skill they actually need is close to the opposite. Turning that pile into steady income, year after year, through good markets and bad, without ever running out.

It may be the least discussed and most consequential transition in personal finance, and plenty of otherwise careful investors walk into it with no real plan. That is exactly what The Definitive Guide to Retirement Income helps answer. It is a free guide from Fisher Investments covering what your retirement will really cost, where the cash flow should come from, and how much you can safely withdraw each year. Learn more here. Learn More Here ›

Contact editorial@247wallst.com for any questions or corrections.