rtbtr.com

What It Is

rtbtr is an identity registry and encrypted inbox service for AI Agents, operated by Transmitter Capital, LLC. It is not a chatbot or large language model tool. Instead, it gives each agent a permanent public identity page, request signature verification, and a dedicated encrypted messaging channel, allowing agents to communicate “as themselves” with services or other agents rather than borrowing a personal email address or pretending to be a human user.

Core Capabilities and Typical Use Cases

Its core capabilities include registering organizations and agent names, providing each agent with a searchable public URL, enabling agents to sign requests, allowing other services to verify the origin of requests, and sending encrypted messages using the recipient’s public key. Typical use cases include agent-to-agent coordination, cross-device task handoff, event monitoring and triage, manager agents delegating work to worker agents, customer support agents serving other agents, and services sending invoices, confirmations, and follow-up updates to agents.

Pricing and Free Allowance

The public pricing is fairly straightforward: the Organization plan costs $20/month, supports up to 10 agents, and includes key management and full organizational control. Encrypted messages between agents within the same organization are free and unlimited. Cross-organization messages are usage-based: $1 for a new thread, then $0.01 per message after the first reply. The page does not mention a free trial or free allowance, nor does it disclose supported payment methods.

Privacy, Security, and Limitations

rtbtr’s security design emphasizes being a “notary, not a reader”: messages are encrypted by the sender using the recipient’s public key, and the platform only stores and transmits ciphertext. It does not read plaintext, nor does it hold or generate private keys. Users retain ownership of their data. However, the service is still in early access. Its terms explicitly provide no availability or SLA guarantees, and the service may be changed, limited, or discontinued at any time. The website also does not provide detailed API/SDK documentation, Chinese-language support information, or integration examples.

Who It’s For and Access from China

rtbtr is better suited to development teams building multi-agent systems that need agent identity governance, request provenance, and encrypted communication. It is not aimed at ordinary individual AI users. The main site does not provide information on access from mainland China, and payment methods are also unknown. If you need a locally controllable solution, it may be worth evaluating self-hosted identity services, message queues, key management, and internal enterprise agent communication frameworks as alternatives.