Navige (site) cuts AI agent costs and controls runaway spending. It has a free Watchtower tier forever (monitoring only), with paid plans starting at $9/month or 20% of savings over $45/month, whichever is greater. Below are three alternatives that cost less to get started, listed cheapest first.
| Product | Free tier | Starts at | Best for |
|---|---|---|---|
| Agents (AGI CLI) | Yes | Free (open source, no stated price) | Devs who want to avoid API bills entirely |
| Argentic | No | $0.001/mo (~10 sats/session) | Metering access per-session instead of a subscription |
| Caplyr | Yes | $29/mo | Teams wanting a dedicated API-bill guardrail with paid tiers |
Agents (AGI CLI)
Agents (site) is an open-source toolchain/meta-harness for CLI coding agents (Claude Code, Codex, etc.) built by Phoenix Labs. It runs on subscriptions and API keys you already pay for, so there's no additional per-token charge — $0 per token, no account needed. It suits developers and small teams who want to avoid runaway API costs by sidestepping metered billing altogether rather than monitoring it. Limitation: it doesn't cap or control spend the way Navige does — it just avoids extra API charges by relying on your existing subscriptions.
Argentic
Argentic (site) is an L402 Lightning "toll booth" for AI scraping agents. It charges about 10 satoshis (~$0.001 USD) per session for one hour of unrestricted access via the Lightning Network, with no subscriptions or accounts required. This suits operators who want pay-per-use access control for agents hitting their content or APIs, rather than ongoing cost monitoring for their own agent spend. Limitation: it has no free tier and is built for gating access/scraping, not for tracking or reducing an organization's own AI agent bills like Navige does.
Caplyr
Caplyr (site) stops runaway AI API bills with a two-line code integration. The free tier protects up to $50/month in spend, and paid plans start at $29/month (Starter), with $99/month (Growth) and $299/month (Scale) tiers above it; a founding-member offer currently gives the first 5 users the Growth tier. It suits teams that want a dedicated, code-level spending cap without the percentage-of-savings pricing Navige uses. Limitation: its paid tiers start higher than Navige's $9/month minimum, so it's cheaper only via its free tier for smaller spend levels.
How to choose
If you want to eliminate API costs rather than monitor them, start with Agents (AGI CLI) since it's free and open source. If you need to gate access to your own content or APIs from scraping agents, Argentic's per-session Lightning pricing is the cheapest metered option. If you want a dedicated spend cap with a free tier up to $50/month and clear flat-rate paid plans, Caplyr is the closest direct alternative to Navige, though its paid tiers cost more per month once you outgrow the free tier.
FAQ
Is there a truly free option? Yes — Agents (AGI CLI) is free and open source with no stated additional cost.
Which alternative is cheapest if I need ongoing protection, not just monitoring? Argentic's $0.001 per session is the cheapest priced option, but it's built for gating access rather than tracking agent spend.
Does any alternative match Navige's free monitoring-only tier? Caplyr's free tier covers up to $50/month in protected spend, which is the closest match among these alternatives.