What is a one-time secret link?

A one-time secret link is a URL that contains an encrypted secret payload. The secret is encrypted in your browser using AES-GCM-256 before transmission — the server never sees your plaintext. When the recipient opens the link, their browser decrypts the secret locally, and the server record is permanently destroyed. A second attempt to open the same link returns 410 Gone.

Can I use Zephr to share secrets between services?

Yes. Zephr is designed for exactly this: passing secrets between independent services, agents, or pipelines without shared infrastructure. One service calls createSecret, receives a one-time link, and passes that link to another service through any channel — a message queue, API response, or task payload. The receiving service calls retrieveSecret to consume the secret, which is then permanently deleted.

How does Zephr work with AI agents?

Zephr is built for agent-to-agent credential handoff. An orchestrator agent creates a one-time secret link containing a credential or API key and passes the link to a downstream agent through any channel. The sub-agent retrieves and consumes the secret. The credential never lives in shared logs, environment variables, or the orchestration layer. SDKs are available for JavaScript/TypeScript (npm install zephr) and Python (pip install zephr), plus a REST API and CLI.

Zephr — Share secrets
without the spyware.

Zero-knowledge credential handoff for AI agents and the humans who build them.

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MCP Server Let agents share secrets in conversation.

npx zephr-mcp Docs →

CLI Create and retrieve secrets from the terminal.

npm install -g zephr Docs →

JavaScript SDK Add secret handoff to Node workflows.

npm install zephr Docs →

Python SDK Add secret handoff to Python workflows.

pip install zephr Docs →

GitHub Action Pass credentials securely between jobs.

zephr-io/share-secret@v1 Docs →

Get an API key to unlock higher limits →

Zephr — Share secrets without the spyware.

Secret Link Created

Zephr — Share secrets
without the spyware.