How to Monitor Third-Party API Dependencies with Vigilmon (Stripe, Twilio, SendGrid)

Your application reliability is not just about your own servers. If Stripe goes down, your users cannot pay. If SendGrid goes down, your welcome emails stop. If Twilio goes down, your SMS OTP flow breaks.

External API dependencies are a hidden source of downtime that most teams only discover when users start complaining.

Why Monitor Third-Party APIs

When a critical external service degrades:

• Your users experience failures that look like your fault
• Your on-call engineer gets paged for something they cannot fix
• Without monitoring, you waste time debugging your own code before realizing it is an external issue

With third-party API monitoring, you can respond correctly from the start: check the provider's status page, communicate to users that you are aware, and wait for the external resolution.

The Two Approaches

Approach 1: Monitor the Provider's Status Endpoint

Most major API providers expose a public status URL:

Provider	Status URL
Stripe	https://status.stripe.com/api/v2/status.json
Twilio	https://status.twilio.com/api/v2/status.json
SendGrid	https://status.sendgrid.com/api/v2/status.json
GitHub	https://www.githubstatus.com/api/v2/status.json
Cloudflare	https://www.cloudflarestatus.com/api/v2/status.json

Set up Vigilmon monitors for each of these. They return HTTP 200 when the service is healthy.

Approach 2: Build a Wrapper Health Endpoint

For more precise monitoring, build a health endpoint in your own API that pings the external service and reports its status:

// Express.js example
app.get('/health/dependencies', async (req, res) => {
  const checks = await Promise.allSettled([
    checkStripe(),
    checkSendGrid(),
    checkDatabase()
  ]);

  const results = {
    stripe: checks[0].status === 'fulfilled' ? 'ok' : 'error',
    sendgrid: checks[1].status === 'fulfilled' ? 'ok' : 'error',
    database: checks[2].status === 'fulfilled' ? 'ok' : 'error'
  };

  const allHealthy = Object.values(results).every(v => v === 'ok');
  res.status(allHealthy ? 200 : 503).json(results);
});

Setting Up Vigilmon Monitors

For each third-party service:

1. Go to vigilmon.online and click New Monitor
2. Set URL to the status endpoint
3. Set Check interval: 2 minutes
4. Set Expected status: 200
5. Configure Slack or email alerts

Grouping Monitors by Criticality

• Critical: Stripe (payments), your main database, your auth service
• High: SendGrid (email), Twilio (SMS), Cloudflare
• Medium: Analytics providers, logging services

Configure different alert channels per group: Critical goes to PagerDuty, Medium sends a Slack notification.

What to Do When a Dependency Goes Down

1. Check the provider's status page for estimated resolution time
2. Add a user-facing status update (in-app banner or status page)
3. Implement graceful degradation where possible (queue emails for retry)
4. Do not reopen an incident as your own if it is clearly the upstream provider

Summary

Monitoring third-party API dependencies immediately tells you when an upstream provider is causing user-facing failures, saves investigation time, and enables accurate status communication to your users.

Most teams set this up in 10 minutes and are glad they did when the first external outage hits.

Start monitoring your API dependencies with Vigilmon - free