What is a Callisto Testnet RPC?
An RPC endpoint connects wallets and applications to Callisto Testnet. Use the endpoints above for JSON-RPC requests, and keep alternatives available for regional endpoint failures or rate limits.
testnetChain ID 20729 · CLO
Callisto Testnet
Public RPC endpoints and wallet configuration for Callisto Testnet.
Network endpoints
Add Callisto Testnet to MetaMask
Use “Add to wallet” to request the network configuration. Always verify chain ID 20729, currency CLO, and the selected RPC before approving.
Public RPC safety
Public endpoints are third-party infrastructure. They may log requests, enforce limits, or become unavailable. Never place private keys, seed phrases, or secrets in an RPC request.
Common RPC errors
Rate limits, browser CORS rules, network mismatch, and temporary provider failures are common. Try another listed endpoint and verify the returned chain ID.
Callisto Testnet RPC FAQ
What is the RPC URL for Callisto Testnet?+
https://testnet-rpc.callisto.network is the recommended endpoint in this directory. Multiple alternatives are listed above in case an endpoint is unavailable from your region.
What is the Callisto Testnet chain ID?+
Callisto Testnet uses chain ID 20729 (0x50f9 in hexadecimal).
How do I add Callisto Testnet to my wallet?+
Use the Add to wallet button above. Your wallet will ask you to review and approve the network details.
Are public RPC endpoints safe?+
Treat public RPCs as infrastructure operated by third parties. They can observe requests, rate-limit traffic, or be unavailable. Never send private keys or seed phrases to an RPC.
Found an issue?
Report a broken RPC →Help keep network data current through a community contribution.