“Help: Fireblocks Vault + Escrow Contract Integration Errors”

Developer Discussion
1

Hi Fireblocks Community,

We’re building a marketplace that uses an escrow smart contract with a Fireblocks vault/wallet.

Flow:

  • Issuer mints tokens via Fireblocks (custom token).

  • Both the escrow contract address and the token address are already whitelisted in Fireblocks.

  • Issuer sends tokens from the Fireblocks wallet into the escrow contract.

  • When an investor tries to buy from the marketplace (i.e. redeem escrowed tokens), we’re still seeing multiple errors.

Questions:

  1. Given that both the escrow contract and token address are already whitelisted, what other Fireblocks settings or permissions could block transfers or redemptions?

  2. Are there special steps or parameters required when moving Fireblocks-managed tokens into a smart contract for escrow?

  3. What are the most common causes of investor purchase/redemption errors in this type of escrow setup?

Any insights or best practices would be greatly appreciated.

Thanks,

Anas KP

2

Hi @anskp ,

Thanks for reaching out to us.

If your workspace has policy rules restricting contract interactions, the transaction can be blocked at the policy layer. Following the guide here, you can configure TAP rules with the Contract call operation type to control which users can call smart contract functions and under which circumstances.

Ensure your transaction is created as a contract call with the correct ABI and method parameters. Also, ensure you have a sufficient base asset balance in your vault to cover the transaction fee.

A few common causes of contract call failures could be,

  • The blocked tx when the transfer is made to the whitelisted address during the cool-off period.
  • If the Fireblocks Transaction Authorization Policy does not allow TYPED_MESSAGE or CONTRACT_CALL transactions, the transaction will be blocked.
  • Incorrect contract parameters used.
  • Insufficient funds for gas