APIs change. Your code shouldn't break.
Monitor. Detect. Fix. Ship.
API Guardian continuously monitors the APIs your software depends on, detects breaking changes before they reach production, identifies affected code, and generates tested fixes automatically delivered as a pull request for you to review.
const email =
- customer.email ?? fallbackEmail;+ customer.email; // email is now always presentThird-party APIs are now critical dependencies.
Modern applications depend on payments, auth, cloud, AI, messaging, shipping, analytics, and dozens of SaaS integrations. When one of those APIs changes, your app can break and most teams only find out after a deploy fails, requests error, or customers complain.
Today · the manual scramble
reactive- 1API provider changes
- 2Developer doesn't know
- 3Application breaks in production
- 4Team investigates & reads changelogs
- 5Find affected code, write a fix
- 6Run tests, then deploy
With API Guardian · automated
proactive- 1API provider changes
- 2AI detects the change
- 3Analyzes impact across your repo
- 4Finds the affected code
- 5Generates & verifies a fix
- 6Opens a pull request for review
An AI maintenance layer for your API dependencies.
API Guardian sits between your application and the external APIs it depends on, continuously observing API contracts and your codebase to understand how changes affect your software.
Monitor
Track API specifications, schemas, versions, docs, and behavioral changes across your dependencies.
Detect
Identify potentially breaking changes before they cause production failures.
Understand & Analyze
Map API endpoints and schemas to the exact code that uses them, and determine which services, functions, and tests are affected.
Fix
Generate code changes designed to restore compatibility, in your repo's conventions.
Verify
Run automated tests and compatibility checks against the proposed change.
Deliver
Open a pull request with the proposed change for developer review.
From API change to tested pull request.
Connect repository
Link your Git repository — GitHub, GitLab, or Bitbucket — so API Guardian can see the code that depends on your APIs.
Connect APIs
Add your API dependencies: REST, GraphQL, OpenAPI specifications, and SDKs.
Monitor
Continuously watch endpoints, request params, response schemas, auth, deprecated fields, removed endpoints, and version changes.
Detect
Determine whether a change is potentially breaking, and score its risk before it reaches production.
Analyze impact
Trace the changed API through your repo to find the blast radius: files, services, functions, and dependent tests.
Generate fix
Propose the necessary code changes, explaining what changed, why the code is affected, and how the fix restores compatibility.
Verify
Validate the patch with unit and integration tests, type checking, static analysis, and API contract validation.
Create pull request
If checks pass, open a PR with the change, test results, and a risk assessment. You stay in control of the merge.
“These 4 files and 2 services are likely affected.”
API Guardian maintains a relationship map between external APIs and your application code, so it can reason about the real impact of a change instead of treating every API update as an isolated event.
Impact analysis · customer.email
Dependency health
Not a notification. A tested pull request.
Continuous API monitoring
Track changes across the external services your application depends on, around the clock.
Breaking-change detection
Catch removed endpoints, renamed fields, type changes, new required params, auth and response changes, and deprecations.
Code impact analysis
Understand how a change propagates through your codebase not just "API changed," but exactly what it affects.
AI-powered fix generation
Generate changes based on your repo's actual structure, API usage, types, tests, and dependency relationships.
Automated verification
Every generated change is validated before it's presented as ready for review.
Pull request automation
Turn detected API problems into actionable pull requests, not notifications you still have to investigate.
Specialized agents, one maintenance workflow.
API Guardian uses focused agents for each stage of maintenance rather than one general-purpose model. An orchestrator coordinates them from detected change to reviewed pull request.
Discovery Agent
Understands API specifications and identifies changes.
Impact Agent
Analyzes repositories and determines affected code.
Migration Agent
Generates the required code changes.
Verification Agent
Runs and analyzes tests and validation checks.
Review Agent
Explains the proposed change and summarizes potential risks.
Orchestrator
Coordinates the agents into a complete maintenance workflow.
Built for developers, not another dashboard.
API Guardian integrates into the tools you already use, so API maintenance becomes part of your existing engineering workflow not another system to constantly monitor.
Repository integrations
- GitHub
- GitLab
- Bitbucket
Development workflows
- Pull requests
- CI/CD
- Automated tests
- Code review
- Issue tracking
Notifications
- Slack
- Webhooks
Generated code is never assumed correct.
API Guardian assists developers rather than blindly modifying production systems. Every proposed fix ships with full transparency, and you keep control of the final merge.
Organizations can configure different automation levels depending on risk. By default, every change waits for human review.
For teams whose software depends on other software.
Software engineering teams
Maintaining apps with many third-party API dependencies.
Startups
Small teams that can't manually monitor every dependency.
SaaS companies
Products that rely heavily on external APIs.
Platform teams
Managing large numbers of integrations across services.
AI application developers
Apps depending on rapidly evolving AI APIs and model providers.
Library & SDK authors
Maintainers who both consume upstream APIs and expose their own to others.
Detection → intelligence → autonomous maintenance.
We're building API Guardian in the open, one phase at a time. This is an early-stage developer preview not a product that already serves thousands of enterprises.
Detection
- API monitoring
- OpenAPI support
- Breaking-change detection
- Repository integration
- Notifications
Impact analysis
- Code dependency mapping
- API-to-code relationships
- Risk scoring
- Blast-radius analysis
AI fixes
- Automated patch generation
- Test generation
- Compatibility validation
- Pull request creation
Autonomous maintenance
- Continuous monitoring
- Automatic migrations
- Multi-repository support
- Remediation policies
Help shape the self-maintenance layer for software.
API Guardian is an early-stage developer preview. We're working with a small group of engineering teams to prove one thing: that AI can detect a real breaking change, find the affected code, and deliver a fix that actually passes your tests.
No fake customer counts, no vanity metrics. Just a serious developer infrastructure product being built with real teams.
- You depend on several third-party or AI APIs
- Breaking changes have burned you in production
- You already ship through pull requests and CI
- You want fixes, not just change notifications
- You're comfortable shaping an early-stage product
The team behind API Guardian.
A multidisciplinary team working across AI, code intelligence, infrastructure, integrations, product, and developer experience.
Frequently asked.
APIs change. Your code shouldn't break.
API Guardian is building the self-maintenance layer for modern software — monitoring external APIs, understanding how changes affect your code, and using AI agents to generate, test, and deliver fixes before dependency changes become production problems.