With Traffic Policy, you can rate limit requests to your endpoints based on a variety of criteria. This page demonstrates a few example rules that do so. See the rate-limit Traffic Policy action docs for more information.

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By endpoint

This rule applies rate limiting of 30 requests per second to the endpoint /api/videos. 
on_http_request:
  -     expressions:
      - req.url.contains('/api/specific_endpoint')
    actions:
      -         type: rate-limit
        config:
          name: Only allow 30 requests per minute
          algorithm: sliding_window
          capacity: 30
          rate: 60s
          bucket_key:
            - conn.client_ip

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Based on authentication status

This rule creates a lower rate limit for unauthenticated (likely free) users, while allowing authenticated users a higher level of capacity. 
on_http_request:
  -     expressions:
      - !('Authorization' in req.headers)
    name: Unauthorized rate limiting tier
    actions:
      -         type: rate-limit
        config:
          name: Allow 10 requests per minute
          algorithm: sliding_window
          capacity: 10
          rate: 60s
          bucket_key:
            - conn.client_ip
  -     expressions:
      - ('Authorization' in req.headers)
    name: Authorized rate limiting tier
    actions:
      -         type: rate-limit
        config:
          name: Allow 100 requests per minute
          algorithm: sliding_window
          capacity: 100
          rate: 60s
          bucket_key:
            - conn.client_ip

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Based on pricing tiers

Using a naming scheme in your upstream servers with API calls using a tier header, you can quickly customize access to your API based on any number of pricing tiers. This rule checks for a Tier header in the request and applies rate limiting based on the value of that header. 
on_http_request:
  -     expressions:
      - !('Tier' in req.headers)
    name: Free rate limiting tier
    actions:
      -         type: rate-limit
        config:
          name: Allow 10 requests per minute
          algorithm: sliding_window
          capacity: 10
          rate: 60s
          bucket_key:
            - conn.client_ip
  -     expressions:
      - getReqHeader('tier').exists(v, v.matches('(?i)bronze'))
    name: Bronze rate limiting tier
    actions:
      -         type: rate-limit
        config:
          name: Allow 100 requests per minute
          algorithm: sliding_window
          capacity: 100
          rate: 60s
          bucket_key:
            - conn.client_ip
  -     expressions:
      - getReqHeader('tier').exists(v, v.matches('(?i)silver'))
    name: Bronze rate limiting tier
    actions:
      -         type: rate-limit
        config:
          name: Allow 1000 requests per minute
          algorithm: sliding_window
          capacity: 1000
          rate: 60s
          bucket_key:
            - conn.client_ip
  -     expressions:
      - getReqHeader('tier').exists(v, v.matches('(?i)gold'))
    name: Gold rate limiting tier
    actions:
      -         type: rate-limit
        config:
          name: Allow 10000 requests per minute
          algorithm: sliding_window
          capacity: 10000
          rate: 60s
          bucket_key:
            - conn.client_ip