fix: ankr => thirdweb for default rpc urls

[tmm]

ankr rugging public rpc urls, thirdweb better anyway
https://x.com/ankr/status/1901666598257401881

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Name	Status	Preview	Updated (UTC)
viem	❌ Failed (Inspect)		Mar 19, 2025 3:40pm

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⚠️ No Changeset found

Latest commit: 5142ba7

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.66%. Comparing base (7f7706e) to head (778ba49).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3475   +/-   ##
=======================================
  Coverage   99.65%   99.66%           
=======================================
  Files         982      982           
  Lines       76342    76332   -10     
  Branches     3306     3306           
=======================================
- Hits        76078    76075    -3     
+ Misses        241      236    -5     
+ Partials       23       21    -2     

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
import * from 'viem' (esm)	66.97 KB (0%)	1.4 s (0%)	4.1 s (+109.29% 🔺)	5.5 s
const viem = require('viem') (cjs)	80.77 KB (0%)	1.7 s (0%)	4.2 s (-59.15% 🔽)	5.9 s
import { createClient, http } from 'viem'	4.25 KB (0%)	85 ms (0%)	1.4 s (+2054.59% 🔺)	1.5 s
import * from 'viem/account-abstraction'	47.68 KB (0%)	954 ms (0%)	3.7 s (+33.09% 🔺)	4.6 s
import * from 'viem/accounts'	82.08 KB (0%)	1.7 s (0%)	1.6 s (-53.13% 🔽)	3.3 s
import { privateKeyToAccount } from 'viem/accounts'	20.67 KB (0%)	414 ms (0%)	2.1 s (-34.15% 🔽)	2.5 s
import { mnemonicToAccount } from 'viem/accounts'	27.04 KB (0%)	541 ms (0%)	2.3 s (-18.59% 🔽)	2.8 s
import * from 'viem/actions'	52.34 KB (0%)	1.1 s (0%)	3.7 s (-6.49% 🔽)	4.7 s
import { getBlockNumber } from 'viem/actions'	318 B (0%)	10 ms (0%)	28 ms (-81.76% 🔽)	38 ms
import * from 'viem/chains'	45.47 KB (-0.13% 🔽)	910 ms (-0.13% 🔽)	5.7 s (+124.24% 🔺)	6.7 s
import { mainnet } from 'viem/chains'	325 B (0%)	10 ms (0%)	20 ms (-71.14% 🔽)	30 ms
import * from 'viem/chains/utils'	1.08 KB (0%)	22 ms (0%)	278 ms (+95.98% 🔺)	299 ms
import * from 'viem/ens'	46.16 KB (0%)	924 ms (0%)	3.1 s (+126.04% 🔺)	4 s
import { getEnsAvatar } from 'viem/ens'	22.46 KB (0%)	450 ms (0%)	1.9 s (-19.99% 🔽)	2.3 s
import * from 'viem/siwe'	31.54 KB (0%)	631 ms (0%)	2.8 s (-9.88% 🔽)	3.5 s
import { verifySiweMessage } from 'viem/siwe'	30.5 KB (0%)	610 ms (0%)	4.4 s (+8.79% 🔺)	5 s

[imornar]

Hi, thanks for handling this, any ETA when this might get in and released?

[jnsdls]

tiny nit - otherwise 🎉

[jnsdls]

Suggested change

	In a production app, it is highly recommended to pass through your authenticated RPC provider URL (Alchemy, Infura, Thirdweb, etc). If no URL is provided, viem will default to a public RPC provider. [Read more](/docs/clients/transports/http#usage).
	In a production app, it is highly recommended to pass through your authenticated RPC provider URL (Alchemy, Infura, thirdweb, etc). If no URL is provided, viem will default to a public RPC provider. [Read more](/docs/clients/transports/http#usage).

[joaquim-verges]

we shut down mumbai btw, so this rpc wont work

[jTiKey]

After this change, I'm getting cors errors:

Access to fetch at 'https://56.rpc.thirdweb.com/' from origin '--- has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.