Authentication

API keys

API keys authenticate your requests to EUrouter. Each key is tied to your account and tracks usage for billing.

Creating a key

1. Go to your Dashboard
2. Navigate to API Keys
3. Click Create New Key
4. Copy and store it securely — you won't see it again

Key format

eur_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Using your API key

Include your key in the Authorization header:

curl https://api.eurouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer $EUROUTER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "mistral-large-3",
    "messages": [{"role": "user", "content": "Hello!"}]
  }'

Environment variables

Store your key in an environment variable — never hardcode it:

export EUROUTER_API_KEY="eur_your_key_here"

Security

Keep keys secret

• Never commit keys to version control
• Don't expose keys in client-side code
• Use environment variables or secret managers

Use separate keys

Create different keys for different environments or applications. This makes it easier to rotate keys and track usage.

Rotate regularly

If a key may have been exposed, delete it immediately and create a new one.

Rate limits

API keys are subject to rate limits based on your plan:

The pricing page is the source of truth for current plan limits.

Rate limit headers

Rate-limited responses return 429 Too Many Requests. They can also include:

When rate limited

If you exceed your limit, wait for the Retry-After period when provided. Otherwise, retry with exponential backoff and jitter.

Need higher limits?

Contact us to discuss custom rate limits for your use case.

Revoking keys

To revoke a key:

1. Go to API Keys in your Dashboard
2. Find the key
3. Click Delete

Revoked keys are invalidated immediately and cannot be restored.