What is a SKALE Calypso Hub Testnet RPC?
An RPC endpoint connects wallets and applications to SKALE Calypso Hub Testnet. Use the endpoints above for JSON-RPC requests, and keep alternatives available for regional endpoint failures or rate limits.
testnetChain ID 974399131 · sFUEL
SKALE Calypso Hub Testnet
Public RPC endpoints and wallet configuration for SKALE Calypso Hub Testnet.
Network endpoints
Add SKALE Calypso Hub Testnet to MetaMask
Use “Add to wallet” to request the network configuration. Always verify chain ID 974399131, currency sFUEL, 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.
SKALE Calypso Hub Testnet RPC FAQ
What is the RPC URL for SKALE Calypso Hub Testnet?+
https://testnet.skalenodes.com/v1/giant-half-dual-testnet is the recommended endpoint in this directory. Multiple alternatives are listed above in case an endpoint is unavailable from your region.
What is the SKALE Calypso Hub Testnet chain ID?+
SKALE Calypso Hub Testnet uses chain ID 974399131 (0x3a14269b in hexadecimal).
How do I add SKALE Calypso Hub 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.