Three plans
The CLI and the diff engine are MIT-licensed and free with no account. What you pay for is continuous monitoring, execution traces, and the CI gate.
| Plan | Free | Pro | Scale |
|---|---|---|---|
| Price | $0 | $79/mo | $249/mo |
| Agent runs | 10,000/mo | 100,000/mo | 1,000,000/mo |
| Retention | 3 days | 30 days | 90 days |
| Agents | 2 | Unlimited | Unlimited |
| Execution traces | ✓ | ✓ | ✓ |
| Error monitoring | ✓ | ✓ | ✓ |
| Performance and incidents | ✓ | ✓ | ✓ |
| MCP contract monitoring | 3 private | 20 private | 60 private |
| Extra servers | - | $3/mo each | $3/mo each |
| Polling interval | Daily | 15 min | 1 min |
| Email alerts | ✓ | ✓ | ✓ |
| Slack | - | ✓ | ✓ |
| CI | - | ✓ | ✓ |
| AI onboarding | ✓ | ✓ | ✓ |
| API / audit export | - | - | ✓ |
| Support | Community | Standard | Priority |
| Start free |
Free forever
Free
Everything you need to catch the first break.
Execution traces and error monitoring · AI onboarding: your coding agent instruments you · Instant checks on any public server · Email alerts
$79/mo
Pro
The CI gate and the alerting a team standardises on.
Everything in Free · Unlimited agents, manifests and repos · Slack alerts and the CI gate · 15-minute polling and 30-day retention
$249/mo
Scale
Minute-level detection and the audit trail to prove it.
Everything in Pro · Minute-level detection · API and audit export · Priority support
Honest note
If every server you depend on validates strictly and your team already triages agent errors with discipline, you will eventually trace a break to the schema without us. Contract monitoring earns its budget line when servers are lenient, when tools are low-traffic, or when you want the break to fail CI instead of production. We'd rather you know that before you pay.