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Catch breaking changes before your users do

One smart network for API and MCP contract checks — close to your vendors, close to your on-call.

Vendor APIs and AI integrations change without warning. DriftGuard watches them and alerts you when something actually breaks.

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No credit card · 1 endpoint full Pro trial Hosted from $59/mo

Watch everywhere

REST, OpenAPI, webhooks, and MCP tool catalogs — one fleet for every integration.

Alert anywhere

Route breaking drift to Slack, PagerDuty, or webhooks between releases.

Scale at any tier

Self-host at $0 or let us run the watches — free to Team-scale retention.

Watch REST APIs, MCP tool catalogs, webhooks, and OpenAPI specs

GitHub Slack PagerDuty Jira Stripe Twilio OpenAI Datadog Notion Sentry

Example scenarios

Illustrative stories from teams monitoring vendor APIs, MCP tool catalogs, and schemas their agents depend on — not customer endorsements.

“MCP tool catalogs change without semver — our agents were calling removed tools while HTTP checks stayed green. Scheduled tools/list diffs now page us only on breaking schema drift.”

MCP platform engineering Enterprise agent infrastructure

Works with popular integrations

GitHub Slack Stripe Twilio PagerDuty Jira OpenAI Datadog Discord Notion

Product lines

Monitor · Protect · Prove

Three buyer jobs — same console spine. Detect contract drift, enforce agent safety, and export proof for compliance and CI.

Monitor

Did their API or MCP contract change?

Command home, fleet watches, and classified changes — breaking, suspicious, and info.

Explore monitor

Protect

Stop agents until the contract is safe

FuseGuard blocks risky tool calls, caps spend, and shows protection ROI in the Agents hub.

Explore protect

Prove

Audit and CI evidence at decision time

Compatibility receipts, pipeline gates, and drift replay — prove contracts before ship.

Explore prove

Up and running in minutes

  1. Paste a URL or MCP endpoint

    Add a watch for any REST API, OpenAPI document, or MCP tools/list catalog your agents depend on.

  2. Baseline snapshot

    DriftGuard stores the contract shape and classifies every change as breaking, warning, or info.

  3. Alert on breaking drift

    Route breaking changes to Slack, PagerDuty, or webhooks — between releases, not after users complain.

Pricing

Start free. Upgrade when you need more.

Self-host forever at $0, or let us run the watches.

Open source

Self-host

$0

  • compare_json + MCP tools
  • MockDrift, FuseGuard, ToolChange
  • CLI diff for CI
View on GitHub

Most popular

Pro

$59/mo

  • 30 watches · 15-minute checks
  • Webhooks + Slack alerts
  • 90-day drift history + export
Start free trial

Platform teams

Fleet

$179/mo

  • 75 watches · 5-minute checks
  • Full-year audit retention
  • Priority webhook delivery
See Fleet plan

Ready to catch breaks early?

Start on one endpoint free. Scale to all your integrations when you're ready.

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