Proxy API with auto switch on AWS lambda

I am creating an API that will act as a proxy for n base APIs that will all do the same. It will use a breaker to detect when one of the underlying API is not available, so the proxy API will have state. One solution is to run the API on AWS lambda and save the state of the circuit breaker to AWS ElastiCache.

Is there an even more economical solution that doesn't require me to run an always-on service like ElasticCache?