AIsa, a San Francisco startup developing infrastructure for enterprise AI agents, has closed a seed extension round that brings its total funding to more than $9 million. Tether, the issuer of the USDT stablecoin, and technology investment firm HIVEN joined as strategic investors.

Existing backers include Alibaba, Tribe Capital, Sumitomo Corporation, Draper Associates, Saison Capital and other investors. AIsa had previously raised $6.5 million by July, including a seed round co-led by Alibaba and Tribe Capital. The company did not disclose the size of the latest extension, the amount invested by Tether or HIVEN, or its valuation.

Infrastructure for Production-Ready AI Agents

AIsa is building what it calls the Trusted Resource and Transaction Network for Enterprise AI Agents. The platform aims to let autonomous software agents discover, access and pay for external resources while enterprises retain control over permissions, spending limits and transactions.

According to the company, fragmented providers, separate integrations and disconnected billing systems currently hinder large-scale deployment of AI agents. AIsa’s network seeks to combine resource discovery, governed access, usage metering, billing and settlement into a single usage-based system.

The infrastructure connects agents to external data sources, AI search tools, models, application programming interfaces, software utilities and industry services. Payments can be settled in fiat currency or stablecoins. Enterprises can set budgets, approval workflows and audit trails so that agents operate only within defined boundaries.

Enterprise Pilots and Platform Metrics

AIsa has begun enterprise pilots in four areas: financial intelligence, market research, supply-chain management and commerce. The company has not named the participating organizations or released details on the stage, revenue or results of these trials.

The platform currently supports more than 250,000 agents and has processed over 100 million transactions. In July the company reported more than 50,000 registered agents. The two figures measure different aspects of activity and are not directly comparable.

Strategic Context of the Investment

Tether’s participation comes after the stablecoin issuer reported a net operating profit of $1.5 billion in the second quarter, generated mainly from interest on U.S. Treasury holdings and repurchase agreements. The investment adds an AI-agent infrastructure company to Tether’s portfolio of strategic positions outside its core stablecoin operations.

AIsa positions the new capital as support for scaling its network and advancing the shift from experimental AI assistants toward agents capable of autonomous operation under enterprise governance. Further product updates and integration milestones will determine how the Trusted Resource and Transaction Network performs in live commercial environments.