Setup

API Keys & Registration

BYOK setup for LLM providers and 47 knowledge sources. Verified July 2026.

Last verified: 11 July 2026

c4reqber is free (AGPL-3.0) — you only pay upstream APIs. Minimum: one OpenRouter key. Add science keys to unlock full MultiSourceSearcher throughput.

Required

LLM providers (optional)

Search APIs

Scientific sources (recommended)

Manual approval

No registration needed

User secrets store

# Recommended — saved to ~/.c4reqber/secrets.env
blast init
# or one key at a time:
blast config keys --assign OPENROUTER_API_KEY=sk-or-...

# TUI v9: Ctrl+Shift+K — Setup Hub

# Dev/Docker fallback
cp .env.example .env
export OPENROUTER_API_KEY="sk-or-..."

blast init or blast config keys --assign KEY=value → ~/.c4reqber/secrets.env. TUI: Ctrl+Shift+K. Override: C4REQBER_CONFIG. Never commit secrets.

Full guide