ENS integration is not usable when eth.merkle.io rate limit hits

[Cafe137]

It seems I have exhausted the eth.merkle.io requests and within a few seconds of using the app, subsequent eth.merkle.io requests are failing with HTTP errors. Either in the format of a CORS error, or a HTTP 429 "Too Many Requests".

This rate limit appears to be quite strict so it would be good to have a fallback provider.

❌ Error getting domain owner: ContractFunctionExecutionError: HTTP request failed.

URL: https://eth.merkle.io
Request body: {"method":"eth_call","params":[{"data":"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","to":"0xca11bde05977b3631167028862be2a173976ca11"},"latest"]}
 
Raw Call Arguments:
  to:    0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e
  data:  0x02571be3a1335cbfd82a30d73d02a92556c942937667381f0913354d9131d285730cf2f4
 
Contract Call:
  address:   0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e
  function:  owner(bytes32 node)
  args:           (0xa1335cbfd82a30d73d02a92556c942937667381f0913354d9131d285730cf2f4)

Docs: https://viem.sh/docs/contract/readContract
Details: Failed to fetch
Version: viem@2.26.3
    at c (7197-9e39166cdb6f5bfd.js:25:69396)
    at c (7197-9e39166cdb6f5bfd.js:1:268237)
    at async eJ (page-b740194429364dc5.js:1:28879)
    at async em (page-b740194429364dc5.js:1:42020)Caused by: CallExecutionError: HTTP request failed.

URL: https://eth.merkle.io
Request body: {"method":"eth_call","params":[{"data":"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","to":"0xca11bde05977b3631167028862be2a173976ca11"},"latest"]}
 
Raw Call Arguments:
  to:    0x00000000000C2E074eC69A0dFb2997BA6C7d2e1e
  data:  0x02571be3a1335cbfd82a30d73d02a92556c942937667381f0913354d9131d285730cf2f4

Details: Failed to fetch
Version: viem@2.26.3
    at a (7197-9e39166cdb6f5bfd.js:25:68838)
    at A (7197-9e39166cdb6f5bfd.js:1:257660)
    at async c (7197-9e39166cdb6f5bfd.js:1:268110)
    at async eJ (page-b740194429364dc5.js:1:28879)
    at async em (page-b740194429364dc5.js:1:42020)Caused by: HttpRequestError: HTTP request failed.

URL: https://eth.merkle.io
Request body: {"method":"eth_call","params":[{"data":"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","to":"0xca11bde05977b3631167028862be2a173976ca11"},"latest"]}

Details: Failed to fetch
Version: viem@2.26.3
    at Object.request (7197-9e39166cdb6f5bfd.js:25:81849)
    at async s (7197-9e39166cdb6f5bfd.js:3:21225)
    at async request (7197-9e39166cdb6f5bfd.js:3:21273)
    at async 7197-9e39166cdb6f5bfd.js:3:19184
    at async s (7197-9e39166cdb6f5bfd.js:25:79994)Caused by: TypeError: Failed to fetch
    at 7197-9e39166cdb6f5bfd.js:25:81401
    at async 7197-9e39166cdb6f5bfd.js:25:80315

[0xCardiE]

We are using wagmi library for this and what happens then is that public RPC is used for that.
So it should work better if we add fallbacks for RPCs like