Relion monitors the APIs your code depends on and shows which files are at risk when a vendor changes something important.
Free forever for 1 repo
The vendor changes a field. Your tests pass. Staging is clean. Then production breaks for real users — and you find out from them.
Stripe silently removes `source` param from PaymentIntent
Checkout begins returning HTTP 400 errors
On-call paged. Engineers begin triage
Root cause identified: vendor schema change
Outcome: Hotfix deployed. Hours of production pain.
// Stripe API — PaymentIntent schema "payment_method_types": ["card"] "automatic_payment_methods": { "enabled": true } ✗ Your code: still passes `source` param ✗ Result: 400 Bad Request on every call─── with Relion ────────────────────── ✓ Change flagged at 09:14 — before your deploy ✓ PR blocked automatically by relion predeploy ✓ Zero users hit the 400. Zero on-call pages.
Relion maps the vendor APIs your repo uses, watches for breaking upstream changes, and turns real impact into dashboard alerts or CI failures.
relion scan finds the third-party API calls in your repo and syncs them to the dashboard.
When a vendor changes an endpoint, schema, or auth rule, Relion shows the files at risk — not just the vendor.
relion predeploy fails CI only when an open vendor change touches code you are shipping. Other PRs flow through untouched.
Same product across four entry points. Pick whichever fits your workflow — or wire up all four.
One binary. Add it as a dev dep, run via npx, or pin a tagged version.
$ relion scanNon-zero exit when an open vendor change touches code in your diff.
✗ exit 1 → push refusedInstall once. Every push scans automatically. Alerts route to Slack and email.
auto-scan every pushShips as an MCP server. Your AI assistant gets live context on every change.
→ relion.get_open_risksFrom payments to AI to observability — Relion watches the APIs your code actually depends on and pings you the moment they change.
Payments, billing, and subscriptions.
PayPal checkout and payments.
Full-stack payment platform (PayPal-owned).
Square payments and point-of-sale.
Enterprise global payment processing.
Bank account linking and financial data.
European payments and SEPA.
India-focused payments and UPI.
Latin America payments platform.
Enterprise payments and acquiring.
Direct debit and bank-to-bank payments.
Subscription billing and revenue ops.
Merchant-of-record SaaS billing.
Payments and licensing for digital products.
Subscription management and recurring billing.
Mobile in-app purchase and subscription management.
GPT, embeddings, and assistants.
Claude family of LLMs.
Don't see your vendor? Request an integration ↗
No credit card. No expiring trial. Good for solo projects and kicking the tires on a real codebase.
Production-grade API intelligence for small teams. Flat rate — no per-seat math, no surprises.
Per-seat billing for larger orgs. Unlimited repos, vendors, and alert rules — scales with the team.
No. The CLI scanner runs entirely on your machine (or CI runner). Only API surface metadata — endpoint paths, HTTP methods, and vendor identifiers — is sent to Relion. Your source code never leaves your environment.
Any runner that can execute a Node.js binary. GitHub Actions, GitLab CI, CircleCI, Jenkins, Buildkite, and Railway deploy hooks all work out of the box. Add `relion predeploy` as a pipeline step and it returns a non-zero exit code when a breaking change intersects your diff.
Relion's scanner uses pattern matching to detect API calls regardless of vendor. If you use a REST or GraphQL API, the scanner will likely detect it. You can also upload OpenAPI specs manually. Request specific vendor support via the dashboard.
Uptime monitors tell you an API is down. Relion tells you an API has changed in a way that will break your specific code — before you deploy. It's structural contract diffing at the field level, not a ping.
Yes. Relion ships an MCP server that connects to Claude Desktop, Cursor, and other AI editors. Your AI assistant can query which APIs are at risk, check scan history, and flag breaking changes — all inside your editor.
One command to scan. One flag to gate deploys. One MCP tool for your AI editor. Free for one repo.
Free forever for 1 repo. No credit card required.