AI agents trust each other because they're on the same network. That's not trust — it's hope. Codios gives every agent a cryptographic identity (Ed25519 + DID:key) and issues signed contracts between them. Agent A can only call Agent B within the scopes the contract specifies. Verified locally — zero added latency, no call home on the hot path. Free tier: up to 5 agents. SDKs for Python and TypeScript. CLI for teams that prefer the terminal.