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Sequenzy sandbox and test environment

This is the live sandbox guide for humans and agents. Sequenzy does not hide a test environment behind a contact-sales form. The free tier is the sandbox: create an account, generate an API key yourself, and send mail at free-plan volume.

Free tier available

Sequenzy has a self-serve free tier: 2,500 emails per month, unlimited contacts, and API, MCP, and CLI access. Sign up at /sign-up. No credit card is required to create an account or use the free plan. Start at /sign-up or read pricing.

Self-serve API key generation

API keys are generated in the dashboard after signup, with no contact-sales form. Open workspace Settings, then API keys, and create a key. Agents can also complete the user-approved service_auth flow in /auth.md and receive a bearer credential. The agent auth guide lives at /auth.md.

Sandbox and test environment

The free plan is the Sequenzy sandbox and test environment. Use it to send real emails at free-tier volume, call the REST API, and connect MCP or the CLI before paying. There is no separate paid sandbox SKU and no sales call to enable test access. Paid plans raise volume; they do not unlock a different API. Use this sandbox URL when you need a stable, crawlable description of the test environment.

Zero-auth access

Discovery, docs, and health checks require no authentication. Fetch /llms.txt, /agents.md, /auth.md, /.well-known/api-catalog, the OpenAPI spec, and GET https://api.sequenzy.com/health without a key. Sending mail and mutating account data still needs a user-approved credential.