# Developer Discussion **URL:** https://community.fireblocks.com/c/discuss/4.md?page=1 [Latest](https://community.fireblocks.com/latest.md) · [Categories](https://community.fireblocks.com/categories.md) · [Tags](https://community.fireblocks.com/tags.md) **Page:** 2 --- ## [Twofa Problem after signing in Sandbox](https://community.fireblocks.com/t/twofa-problem-after-signing-in-sandbox/3010)
**Author:** [@Deenadhayalan](https://community.fireblocks.com/u/Deenadhayalan)\ **Replies:** 1\ **Last updated:** [November 13, 2025, 5:37am UTC](https://community.fireblocks.com/t/twofa-problem-after-signing-in-sandbox/3010 "2025-11-13T05:37:04Z")
After login my sanbox account I scanned QR code for Twofa in google authenticator extension in website, but I paste 2fa code it shows above as ‘Something went wrong. Try again’. I tried many times even though I clear … --- ## [Signing doesnt work after 5 minutes](https://community.fireblocks.com/t/signing-doesnt-work-after-5-minutes/3009)
**Author:** [@fireblocks2](https://community.fireblocks.com/u/fireblocks2)\ **Replies:** 0\ **Last updated:** [November 5, 2025, 10:59pm UTC](https://community.fireblocks.com/t/signing-doesnt-work-after-5-minutes/3009 "2025-11-05T22:59:51Z")
Hello! I ran into a problem when using WalletConnect v2. Scenario: I connect a crypto wallet through WalletConnect v2 (scan QR, a pairing and a session are created). At first, transaction signing works normally. Afte… --- ## [BTC\_TEST network fee is increased very high (starting from 0.0002691 based on request amount 0.0001)](https://community.fireblocks.com/t/btc-test-network-fee-is-increased-very-high-starting-from-0-0002691-based-on-request-amount-0-0001/3005)
**Author:** [@night](https://community.fireblocks.com/u/night)\ **Replies:** 0\ **Last updated:** [October 28, 2025, 7:03pm UTC](https://community.fireblocks.com/t/btc-test-network-fee-is-increased-very-high-starting-from-0-0002691-based-on-request-amount-0-0001/3005 "2025-10-28T19:03:39Z")
Recently fireblocks sandbox has increased the network fee for BTC\_TEST coin dynamically based on the amount: { “asset”: “BTC”, “originalAmount”: “0.0001”, “networkFee”: “0.0002691”, “netAmount”: “-0.0001691” } { … --- ## [Custom Smart Contract Integration Question](https://community.fireblocks.com/t/custom-smart-contract-integration-question/2995)
**Author:** [@anskp](https://community.fireblocks.com/u/anskp)\ **Replies:** 1\ **Last updated:** [October 22, 2025, 7:15am UTC](https://community.fireblocks.com/t/custom-smart-contract-integration-question/2995 "2025-10-22T07:15:48Z")
Subject: Custom Smart Contract Integration Question Hi Fireblocks Team, I’m building an RWA marketplace and need to understand: Can I use Fireblocks Tokenization Engine to mint tokens? Can those tokens interact with … --- ## [Request for Testnet Account and Guidance on Required Production Settings](https://community.fireblocks.com/t/request-for-testnet-account-and-guidance-on-required-production-settings/2990)
**Author:** [@dung.nguyen.trung](https://community.fireblocks.com/u/dung.nguyen.trung)\ **Replies:** 1\ **Last updated:** [October 22, 2025, 6:39am UTC](https://community.fireblocks.com/t/request-for-testnet-account-and-guidance-on-required-production-settings/2990 "2025-10-22T06:39:09Z")
Hi Fireblocks team :waving\_hand:, I’ve been testing my integration successfully on the Fireblocks Sandbox environment, and everything is working as expected. In my sandbox setup: I created separate vaults for each n… --- ## [I am not able to create wallets of type NCW , however that correct since my API admins does not have that access but the issue is I didn't find any such role in my workspace?](https://community.fireblocks.com/t/i-am-not-able-to-create-wallets-of-type-ncw-however-that-correct-since-my-api-admins-does-not-have-that-access-but-the-issue-is-i-didnt-find-any-such-role-in-my-workspace/2997)
**Author:** [@Abhishek1](https://community.fireblocks.com/u/Abhishek1)\ **Replies:** 0\ **Last updated:** [October 17, 2025, 6:35pm UTC](https://community.fireblocks.com/t/i-am-not-able-to-create-wallets-of-type-ncw-however-that-correct-since-my-api-admins-does-not-have-that-access-but-the-issue-is-i-didnt-find-any-such-role-in-my-workspace/2997 "2025-10-17T18:35:49Z")
{ "error": "Unauthorized", "details": { "message": "Unauthorized" }, "type": "NCWWalletCreationError" } --- ## [Oauth config in sandbox console](https://community.fireblocks.com/t/oauth-config-in-sandbox-console/2996)
**Author:** [@Abb](https://community.fireblocks.com/u/Abb)\ **Replies:** 0\ **Last updated:** [October 16, 2025, 3:27pm UTC](https://community.fireblocks.com/t/oauth-config-in-sandbox-console/2996 "2025-10-16T15:27:01Z")
I am unable to find the section to setup Oauth config in the sandbox console. --- ## [How to do a transaction with data on non-evm chains?](https://community.fireblocks.com/t/how-to-do-a-transaction-with-data-on-non-evm-chains/2994)
**Author:** [@shubhamsharma0040](https://community.fireblocks.com/u/shubhamsharma0040)\ **Replies:** 0\ **Last updated:** [October 15, 2025, 1:10pm UTC](https://community.fireblocks.com/t/how-to-do-a-transaction-with-data-on-non-evm-chains/2994 "2025-10-15T13:10:01Z")
I have a platform in which I am creating a platform based swap system. I have about 10 different chains and need to do swap on all. I have used bridgers for my swap, and the code is something like this: const txPar… --- ## [Device Setup Incomplete & Max Device Limit Issue During MPC Key Generation](https://community.fireblocks.com/t/device-setup-incomplete-max-device-limit-issue-during-mpc-key-generation/2986)
**Author:** [@priya1092](https://community.fireblocks.com/u/priya1092)\ **Replies:** 0\ **Last updated:** [October 13, 2025, 6:51am UTC](https://community.fireblocks.com/t/device-setup-incomplete-max-device-limit-issue-during-mpc-key-generation/2986 "2025-10-13T06:51:32Z")
Hello Fireblocks Team, I have encountered a problem while working with device and MPC key setup using your SDK: I initialised the SDK and completed device setup for a wallet. When trying to generate MPC keys, I re… --- ## [Midnight Glacier claim on Cardano issue raw signing](https://community.fireblocks.com/t/midnight-glacier-claim-on-cardano-issue-raw-signing/2981)
**Author:** [@benj](https://community.fireblocks.com/u/benj)\ **Replies:** 0\ **Last updated:** [October 8, 2025, 7:30pm UTC](https://community.fireblocks.com/t/midnight-glacier-claim-on-cardano-issue-raw-signing/2981 "2025-10-08T19:30:11Z")
Alright I’m about to give up. I have full set up the AWS system for raw signing on Cardano and can’t get the final claim button on the midnight glacier claim to go through. I’m using the Fireblocks python SDK for signatu… --- ## [Raw Signing Tokens XRPL](https://community.fireblocks.com/t/raw-signing-tokens-xrpl/2514)
**Author:** [@Andy8](https://community.fireblocks.com/u/Andy8)\ **Replies:** 4\ **Last updated:** [October 7, 2025, 1:54pm UTC](https://community.fireblocks.com/t/raw-signing-tokens-xrpl/2514 "2025-10-07T13:54:45Z")
I’m working on activating the RLUSD token on the XRP Ledger within a sandbox environment. I attempted to raw sign a trustline for RLUSD on the devnet but encountered an error with the sub-status: “The asset is not suppor… --- ## [Bridge (Stripe) or alfred Integration with FireBlocks](https://community.fireblocks.com/t/bridge-stripe-or-alfred-integration-with-fireblocks/2977)
**Author:** [@Anton](https://community.fireblocks.com/u/Anton)\ **Replies:** 1\ **Last updated:** [October 7, 2025, 11:59am UTC](https://community.fireblocks.com/t/bridge-stripe-or-alfred-integration-with-fireblocks/2977 "2025-10-07T11:59:11Z")
Hi FireBlocks Team, We’re integrating fiat off-ramp for clinical trial patient payouts and need guidance on choosing between Bridge (Stripe) and alfred - both show LIVE status on FireBlocks Network. Integration Example… --- ## [Failed to generate MPC keys: B2: Max devices per wallet reached](https://community.fireblocks.com/t/failed-to-generate-mpc-keys-b2-max-devices-per-wallet-reached/2963)
**Author:** [@priya1092](https://community.fireblocks.com/u/priya1092)\ **Replies:** 2\ **Last updated:** [October 6, 2025, 6:29am UTC](https://community.fireblocks.com/t/failed-to-generate-mpc-keys-b2-max-devices-per-wallet-reached/2963 "2025-10-06T06:29:39Z")
when trying to generate MPC keys using the Fireblocks SDK. I understand this happens when a wallet already has the maximum number of devices linked. My question is: :backhand\_index\_pointing\_right: Is there any SDK meth… --- ## [Fiat off-ramp solution for bulk payouts to multiple recipients](https://community.fireblocks.com/t/fiat-off-ramp-solution-for-bulk-payouts-to-multiple-recipients/2975)
**Author:** [@Anton](https://community.fireblocks.com/u/Anton)\ **Replies:** 0\ **Last updated:** [October 3, 2025, 12:36pm UTC](https://community.fireblocks.com/t/fiat-off-ramp-solution-for-bulk-payouts-to-multiple-recipients/2975 "2025-10-03T12:36:55Z")
Hi FireBlocks Community, We’re building a payment platform that needs to convert USDC from FireBlocks custody to USD and send payments to hundreds of individual bank accounts (third-party beneficiaries). Requirements: … --- ## [Swap API Endpoint](https://community.fireblocks.com/t/swap-api-endpoint/2909)
**Author:** [@george.monroyo](https://community.fireblocks.com/u/george.monroyo)\ **Replies:** 5\ **Last updated:** [October 2, 2025, 2:45pm UTC](https://community.fireblocks.com/t/swap-api-endpoint/2909 "2025-10-02T14:45:54Z")
Based on the documentation, response for createswap operation, the error field is an object but on the sample response, it is a string. What should we follow? --- ## [What endpoints to use if building a ledger to track all balance changes per vault?](https://community.fireblocks.com/t/what-endpoints-to-use-if-building-a-ledger-to-track-all-balance-changes-per-vault/2951)
**Author:** [@nicolaisingh-maya](https://community.fireblocks.com/u/nicolaisingh-maya)\ **Replies:** 2\ **Last updated:** [October 2, 2025, 1:20am UTC](https://community.fireblocks.com/t/what-endpoints-to-use-if-building-a-ledger-to-track-all-balance-changes-per-vault/2951 "2025-10-02T01:20:05Z")
Hi, I need to build a ledger where each balance change to all vaults gets tracked so we could query the balance at a point in time. I’ve utilized the getTransactions() SDK function in ts-sdk (ts-sdk/docs/apis/Transactio… --- ## [“Help: Fireblocks Vault + Escrow Contract Integration Errors”](https://community.fireblocks.com/t/help-fireblocks-vault-escrow-contract-integration-errors/2961)
**Author:** [@anskp](https://community.fireblocks.com/u/anskp)\ **Replies:** 1\ **Last updated:** [September 30, 2025, 8:45am UTC](https://community.fireblocks.com/t/help-fireblocks-vault-escrow-contract-integration-errors/2961 "2025-09-30T08:45:26Z")
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 a… --- ## [How Convert USDC from Fireblocks wallets to USD fiat and Send payments to multiple patients' bank accounts](https://community.fireblocks.com/t/how-convert-usdc-from-fireblocks-wallets-to-usd-fiat-and-send-payments-to-multiple-patients-bank-accounts/2950)
**Author:** [@ikaborda](https://community.fireblocks.com/u/ikaborda)\ **Replies:** 1\ **Last updated:** [September 29, 2025, 8:41am UTC](https://community.fireblocks.com/t/how-convert-usdc-from-fireblocks-wallets-to-usd-fiat-and-send-payments-to-multiple-patients-bank-accounts/2950 "2025-09-29T08:41:57Z")
Withdraw USDC from Fireblocks wallets Convert to USD fiat Send payments to multiple patients’ bank accounts Fiat Payment Simulation in Sandbox How do we simulate fiat off-ramping (USDC → USD) in Sandbox? Can w… --- ## [How can I delegate signing of my Smart Contract Wallet to Fireblocks while keeping all assets and transactions within the SCA?](https://community.fireblocks.com/t/how-can-i-delegate-signing-of-my-smart-contract-wallet-to-fireblocks-while-keeping-all-assets-and-transactions-within-the-sca/2965)
**Author:** [@Abhi\_07](https://community.fireblocks.com/u/Abhi_07)\ **Replies:** 0\ **Last updated:** [September 29, 2025, 12:34am UTC](https://community.fireblocks.com/t/how-can-i-delegate-signing-of-my-smart-contract-wallet-to-fireblocks-while-keeping-all-assets-and-transactions-within-the-sca/2965 "2025-09-29T00:34:49Z")
I’ve built a smart contract wallet (SCA) where I want to retain custody of all assets inside the contract itself — My requirement is that all transactions continue to be executed from the SCA, but the signing/authorizat… --- ## [Question: Setting issues of Gas Station in the sandbox environment](https://community.fireblocks.com/t/question-setting-issues-of-gas-station-in-the-sandbox-environment/2942)
**Author:** [@rainbow](https://community.fireblocks.com/u/rainbow)\ **Replies:** 0\ **Last updated:** [September 18, 2025, 10:46am UTC](https://community.fireblocks.com/t/question-setting-issues-of-gas-station-in-the-sandbox-environment/2942 "2025-09-18T10:46:10Z")
How can the funds from this Gas Station be transferred? Directly through an external wallet? I used the Console and found that addresses can be arbitrarily added to the Gas Station. How does this enable gas fee sponsorsh… --- ## [Privatization deployment](https://community.fireblocks.com/t/privatization-deployment/2941)
**Author:** [@xcy](https://community.fireblocks.com/u/xcy)\ **Replies:** 0\ **Last updated:** [September 18, 2025, 10:42am UTC](https://community.fireblocks.com/t/privatization-deployment/2941 "2025-09-18T10:42:34Z")
Does fireblocks support privatization deployment, and how are private keys managed? --- ## [Error is reported using USDC to convert to ETH (Sepolia)](https://community.fireblocks.com/t/error-is-reported-using-usdc-to-convert-to-eth-sepolia/2932)
**Author:** [@xcy](https://community.fireblocks.com/u/xcy)\ **Replies:** 6\ **Last updated:** [September 17, 2025, 3:17am UTC](https://community.fireblocks.com/t/error-is-reported-using-usdc-to-convert-to-eth-sepolia/2932 "2025-09-17T03:17:05Z")
--- ## [MPC signing failed for Embedded Wallets (NCW) sandbox enviroment](https://community.fireblocks.com/t/mpc-signing-failed-for-embedded-wallets-ncw-sandbox-enviroment/2934)
**Author:** [@namtran163](https://community.fireblocks.com/u/namtran163)\ **Replies:** 0\ **Last updated:** [September 16, 2025, 3:02pm UTC](https://community.fireblocks.com/t/mpc-signing-failed-for-embedded-wallets-ncw-sandbox-enviroment/2934 "2025-09-16T15:02:50Z")
Hi, I’m integrating Embedded Wallets. Things is working fine so far and I could generate mpc keys and sign transactions. But suddenly it stops working since yesterday with all provisioned embedded wallets on both andro… --- ## [Unable to access APIs](https://community.fireblocks.com/t/unable-to-access-apis/2894)
**Author:** [@omerhayatgill](https://community.fireblocks.com/u/omerhayatgill)\ **Replies:** 1\ **Last updated:** [September 10, 2025, 4:42am UTC](https://community.fireblocks.com/t/unable-to-access-apis/2894 "2025-09-10T04:42:11Z")
Hi, I am using postman collection and trying to call /vault/asset\_wallets API but receiving 404 Not found with following error message. Error Cannot GET /vault/asset\_wallets --- ## ["Problems querying the status of a token"](https://community.fireblocks.com/t/problems-querying-the-status-of-a-token/2793)
**Author:** [@Zoran](https://community.fireblocks.com/u/Zoran)\ **Replies:** 2\ **Last updated:** [September 9, 2025, 5:44pm UTC](https://community.fireblocks.com/t/problems-querying-the-status-of-a-token/2793 "2025-09-09T17:44:21Z")
I’m using the sandbox environment to test my API, and I’m encountering the same error from the API on both of these endpoints. Without them, I can’t complete any token Issuance or Minting operations. Base URL: https://s… --- ## [Using Custom Gas Vaults in Gas Station – Auto-Fuel Issue & Tron Support](https://community.fireblocks.com/t/using-custom-gas-vaults-in-gas-station-auto-fuel-issue-tron-support/2903)
**Author:** [@dung.nguyen.trung](https://community.fireblocks.com/u/dung.nguyen.trung)\ **Replies:** 0\ **Last updated:** [September 5, 2025, 2:06am UTC](https://community.fireblocks.com/t/using-custom-gas-vaults-in-gas-station-auto-fuel-issue-tron-support/2903 "2025-09-05T02:06:12Z")
Hi Fireblocks team & community, I’m currently testing in Sandbox using the account registered under: dung.nguyen.trung+1@cozuchi.com I ran into a few issues and questions: 1. Auto-Fuel Not Working with Custom Gas Va… --- ## [How do I connect Fireblocks via WalletConnect to perform staking on the Tron Shasta testnet?](https://community.fireblocks.com/t/how-do-i-connect-fireblocks-via-walletconnect-to-perform-staking-on-the-tron-shasta-testnet/2896)
**Author:** [@bearfly](https://community.fireblocks.com/u/bearfly)\ **Replies:** 0\ **Last updated:** [September 4, 2025, 7:48am UTC](https://community.fireblocks.com/t/how-do-i-connect-fireblocks-via-walletconnect-to-perform-staking-on-the-tron-shasta-testnet/2896 "2025-09-04T07:48:11Z")
I am currently on Tron’s Shasta testnet and have built a staking dapp. I use WalletConnect to connect to Fireblocks, but a prompt pops up saying: “The dApp didn’t respond to the connection attempt. Try using the Firebloc… --- ## [Using Custom Gas Vaults in Gas Station – Auto-Fuel Issue & Tron Support](https://community.fireblocks.com/t/using-custom-gas-vaults-in-gas-station-auto-fuel-issue-tron-support/2830)
**Author:** [@noreplyteacher](https://community.fireblocks.com/u/noreplyteacher)\ **Replies:** 2\ **Last updated:** [September 3, 2025, 9:39am UTC](https://community.fireblocks.com/t/using-custom-gas-vaults-in-gas-station-auto-fuel-issue-tron-support/2830 "2025-09-03T09:39:48Z")
Hi Fireblocks team & community, I’m currently testing in Sandbox using the account registered under: dung.nguyen.trung+1@cozuchi.com I ran into a few issues and questions: 1. Auto-Fuel Not Working with Custom Gas Va… --- ## [Authorized page redirects back to login after successful login | Fireblocks console | sandBox | auth issue](https://community.fireblocks.com/t/authorized-page-redirects-back-to-login-after-successful-login-fireblocks-console-sandbox-auth-issue/2722)
**Author:** [@aman](https://community.fireblocks.com/u/aman)\ **Replies:** 1\ **Last updated:** [August 28, 2025, 3:28am UTC](https://community.fireblocks.com/t/authorized-page-redirects-back-to-login-after-successful-login-fireblocks-console-sandbox-auth-issue/2722 "2025-08-28T03:28:19Z")
after signup for sandbox account for testing purpose when ever i try to login i got error and cant logged in ! see attachment i got this error --- ## [I've Lost Access to Authenticator App](https://community.fireblocks.com/t/ive-lost-access-to-authenticator-app/2703)
**Author:** [@bilal4598](https://community.fireblocks.com/u/bilal4598)\ **Replies:** 3\ **Last updated:** [August 26, 2025, 3:42am UTC](https://community.fireblocks.com/t/ive-lost-access-to-authenticator-app/2703 "2025-08-26T03:42:27Z")
I’ve lost access to my authenticator app, and I cannot access it, I tried creating a ticket here: https://support.fireblocks.io/hc/en-us/requests/new?ticket\_form\_id=360003372200&tf\_360023089139=user\_operations&tf\_360023… [Previous page](https://community.fireblocks.com/c/discuss/4.md) [Next page](https://community.fireblocks.com/c/discuss/4.md?page=2)