Fireblocks Testnet – Limited Asset Support Issue (BTC_TEST & USDC_NOBLE_TEST only)

Developer Discussion
1

Hi everyone,

We’re currently integrating with Fireblocks testnet environment and running into a limitation that we’re unable to resolve.

Issue Summary

In our testnet workspace, only the following assets are working:

BTC_TEST

USDC_NOBLE_TEST

However, all other assets are failing with “asset not supported” errors, including:

  • ETH (e.g., ETH_TEST, ETH_TESTNET)

  • USDT (ERC20/TRC20 variants)

  • SOLANA

  • BSC / Arbitrum / other chains

We’ve tried multiple combinations like:

  • ETH_TEST

  • ETH_TESTNET

  • USDT_ETH_TEST

  • USDT_TRX_TEST

  • SOL_TEST

  • BSC_TEST

  • ARBITRUM_TEST

All of them return:

“The asset is not supported by Fireblocks”

Questions

  1. Is Fireblocks testnet restricted to only a few assets (like BTC + Noble USDC)?

  2. Is there a way to enable additional testnet assets in sandbox?

  3. Are we missing any:

    • Workspace configuration?

    • Feature flags?

    • Asset enablement steps via API or console?

  4. Is full asset testing only possible in production workspace?

  5. Any recommended approach for testing multi-chain flows (ETH, USDT, SOL) before going live?

  • Best practices for multi-asset testing in Fireblocks

  • Workarounds (mocking, simulation, hybrid approach)

  • Confirmation if this is a known sandbox limitation

Any guidance or confirmation from others who faced this would be really helpful :folded_hands:

Thanks in advance!