ApexAPIUsageMonitor.apxc

public class ApexAPIUsageMonitor {
    
	public static void fetchApiUsage() {
        String endpoint = System.Url.getOrgDomainUrl().toExternalForm() + '/services/data/v62.0/limits';
        
        // Set up HTTP request
        Http http = new Http();
        HttpRequest req = new HttpRequest();
        req.setEndpoint(endpoint);
        req.setMethod('GET');
        req.setHeader('Authorization', 'Bearer ' + UserInfo.getSessionId());

        try {
            HttpResponse res = http.send(req);
            if (res.getStatusCode() == 200) {
                // Parse the API response
                Map<String, Object> result = (Map<String, Object>) JSON.deserializeUntyped(res.getBody());
                System.debug('API Usage Details: ' + result.get('DailyApiRequests'));
            } else {
                System.debug('Failed to fetch API usage. Status: ' + res.getStatusCode());
            }
        } catch (Exception e) {
            System.debug('Error fetching API usage: ' + e.getMessage());
        }
    }
}