How to Manage Third-Party API Quotas Across Microservices at Scale

Your Salesforce sync worker, your webhook processor, and your customer-facing AI agent are all hitting the same third-party tenant. Each thinks it has the full quota. None of them know the others exist. Then a busy Tuesday afternoon arrives, the daily API limit blows up at 2:47 PM, and every integration in your product starts returning 429 Too Many Requests simultaneously. Customer dashboards go blank. PagerDuty lights up. Because these internal microservices operate independently, they have no shared awareness of the external API’s rate limits.