POST
/
auth
/
challenge
curl -X POST https://api.stableyard.fi/v2/auth/challenge \
  -H "Content-Type: application/json" \
  -d '{
    "wallet": "0x742d35Cc6634C0532925a3b844Bc9e7595f4fA9",
    "chainType": "evm"
  }'

{
  "challenge": "Sign this message to authenticate with Stableyard.\n\nNonce: 4f7d1a8c2b3e9d10\nTimestamp: 2026-03-18T10:20:30.000Z\nURI: https://api.stableyard.fi/v2",
  "nonce": "4f7d1a8c2b3e9d10",
  "expiresAt": 1773829530
}
Create a challenge message that the user must sign with their wallet to authenticate. No authentication required for this endpoint.
​
wallet
string
required
The user’s wallet address (e.g., 0x742d...4fA9 for EVM, base58 for Solana)
​
chainType
string
required
The wallet’s chain type. One of: evm, solana, movement
curl -X POST https://api.stableyard.fi/v2/auth/challenge \
  -H "Content-Type: application/json" \
  -d '{
    "wallet": "0x742d35Cc6634C0532925a3b844Bc9e7595f4fA9",
    "chainType": "evm"
  }'

{
  "challenge": "Sign this message to authenticate with Stableyard.\n\nNonce: 4f7d1a8c2b3e9d10\nTimestamp: 2026-03-18T10:20:30.000Z\nURI: https://api.stableyard.fi/v2",
  "nonce": "4f7d1a8c2b3e9d10",
  "expiresAt": 1773829530
}
​
challenge
string
required
The message the user must sign with their wallet
​
nonce
string
required
Unique nonce to include in the verify request
​
expiresAt
number
required
Unix timestamp when the challenge expires