AI agents get wallets: the week in agent payments (Sept 22-25)

In four days, some of the biggest names in crypto and finance pushed the same idea: AI agents that can hold money, pay for things and act inside limits their users set. Here is what actually shipped, and one data point that keeps it in perspective.

In brief

• Sept 22 - Coinbase: “Coinbase for Agents” now covers US stocks and ETFs, and agents can pay for data mid-task with x402 micropayments.
• Sept 23 - BlackRock: a paper called “The Machine-Native Economy” frames AI as machine-native intelligence and digital assets as machine-native money.
• Sept 24 - Block: Jack Dorsey’s company joined the x402 Foundation and brought Bitcoin Lightning payments to the standard.
• Sept 24 - Public x Kalshi: Public’s AI agents can now use prediction-market odds as triggers, with Kalshi handling the contracts.
• Reality check - TRM Labs: only an estimated 0.6% to 7.5% of commerce-like x402 payment value looks like it came from AI agents.

The details

Coinbase for Agents. Agents connected through a user’s Coinbase login get access to thousands of US stocks and ETFs (fractional shares from $1, 24/5 trading), alongside crypto and derivatives. The new piece is x402: an agent can pay a few cents for an earnings summary or an on-chain query while it works. Coinbase says x402 has processed more than 230 million transactions and over $54 million in volume.

Block and Lightning. x402 was created by Coinbase in 2025 and now sits in a foundation under the Linux Foundation, with members including Google, Microsoft, AWS and the Solana Foundation. Block’s addition means agents can settle x402 payments in bitcoin over Lightning, which Block argues suits small, frequent payments.

Public and Kalshi. Users describe a strategy, the agent turns it into fixed rules (alerts or automatic orders), and the user must approve those rules before anything runs. Kalshi, a CFTC-regulated exchange, provides the event contracts.

BlackRock’s paper. It names stablecoins as the obvious first payment instrument for agents, cites over $300 billion in stablecoin supply, points to Ethereum and Circle’s Arc as possible settlement layers, and suggests compute capacity could one day trade as its own asset. It is a research paper, not a product.

TRM’s counterweight. Across about 198.9 million x402 settlements worth $52.7 million since May 2025, TRM filtered out self-transfers and odd flows and estimated that only 0.6% (strict) to 7.5% (loose) of the remaining value looked agent-driven. TRM itself notes the method may undercount single-purpose agents.

Our take

The infrastructure is arriving faster than the usage. Payment rails, custody and regulated venues for agents are now real; genuine agent spending is still small. If you try these tools, keep spending caps tight, review the rules an agent will follow, and never give any agent or app your seed phrase. This is not investment advice.