Authenticate with JWT
POST
https://api.g.alchemy.com/signer/v1/auth-jwt
Authenticates an existing user using a JSON Web Token (JWT) for secure access to their Smart Wallet functionality. New user signup and wallet pregeneration are no longer supported as of June 16, 2026 because Alchemy Signer APIs are being sunset.
Headers
stringrequired
Bearer token authentication. Use 'Bearer <apiKey>' as the value.
Request Body
Responses
200
JWT authentication successful. User is now authenticated or wallet has been pregenerated.
400
Invalid JWT token or authentication failed.
401
Unauthorized - JWT token is invalid, expired, or malformed.
429
Too many authentication attempts. Please wait before trying again.
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