Workers JSRPC Pricing

Hello, after searching through a good deal of the documentation and blogs concerning workers, there's one piece of information that's missing, but I think it's due to its very recent nature.
The pricing on workers is really clear and on this point I have no worries. But I'd like to know more about JS RPC.
When a worker makes an RPC call to another worker, does this count as several requests or just one?
If I were to create a microservice for CORS management, one for token management and other uses, I could easily come up with a request that counts as 3 if that's the case. This can quickly become quite substantial if badly managed, and could make me think entirely about my microservices architecture.

Thanks in advance for your reply.
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