I've been closely monitoring the progress of the World Liberty Financial ecosystem, especially the real-world use cases of the USD1 stablecoin. We previously discussed that if an AI Agent can only analyze but cannot make payments, it's like a car without wheels. Now that AgentPay v0.2.1 is out, this shortcoming has been addressed.

In simple terms, this upgrade enables the AI agent to independently complete payments within the safety rules you set. It has integrated two payment protocols—x402 and MPP—so that in the future, you can give an instruction to the AI, and it will directly call the payment interface, purchase data, and run the entire online process without manual transfers.

Core upgrade: from "help AI manage money" to "let AI spend money"

The first version of AgentPay already supported local self-hosting, strategy-aware transfers, and manual approval. With v0.2.1, the same runtime environment has been extended to handle paid HTTP streams, supporting EIP-3009 signature extensions, and has connected to the Tempo mainnet.

Now, a single command can accomplish everything. Taking x402 as an example, the process is straightforward: the Agent requests a resource, and the API returns a 402 status code indicating how much needs to be paid. AgentPay first checks your preset single-transaction limit, confirms the payment, signs locally with EIP-3009, attaches the proof of payment, and re-requests. The API then returns 200 and the data. All this takes less than two seconds with one command.

On the MPP side, it's even more interesting, supporting session flows on the Tempo mainnet.