Sounds good. But according to https://blog.logrocket.com/fetch-api-node-js/, both node 18 and 20 do not have a stable fetch implementation yet

Aw, bummer. It looks like the blockers for stable were something with cookie and some perf,

• Stable Fetch nodejs/undici#1737

If those aren't blockers for Tendermint RPC (they aren't in my case) then this could proceed.

Relevant historical commit: #1240 / 182b1e7

Sounds good. But according to https://blog.logrocket.com/fetch-api-node-js/, both node 18 and 20 do not have a stable fetch implementation yet

It wasn't officially marked 'stable' in 18, but it didn't require an experimental feature flag anymore either.

The blog also recommends just using a polyfill:

Additionally, for legacy projects where upgrading Node.js isn’t an option, you can use a library like node-fetch to add Fetch support to your project.

So migrating from axios to minipass-fetch, node-fetch or cross-fetch (all less than 5% of the unpacked size of axios) for now would make sense if 18's fetch is unuseable. (18 is EOL as of April 30, though.)