# Developers **URL:** https://forum.klever.org/c/kleverchain/developers/9.md?page=1 [Latest](https://forum.klever.org/latest.md) · [Categories](https://forum.klever.org/categories.md) · [Tags](https://forum.klever.org/tags.md) **Page:** 2 --- ## [Klever SC invoke via Node SDK / Troubleshooting + Fix](https://forum.klever.org/t/klever-sc-invoke-via-node-sdk-troubleshooting-fix/3931)
**Author:** [@Andreas\_Hennersdorf](https://forum.klever.org/u/Andreas_Hennersdorf)\ **Replies:** 9\ **Last updated:** [July 21, 2025, 3:08pm UTC](https://forum.klever.org/t/klever-sc-invoke-via-node-sdk-troubleshooting-fix/3931 "2025-07-21T15:08:36Z")
Hey @Duka I’m currently building a Node.js backend to interact with a smart contract using @klever/sdk-node. I’m following your official documentation and explicitly setting the node and API endpoints to Testnet like yo… --- ## [Adding Metadata to TransferContract in klever/sdk-node](https://forum.klever.org/t/adding-metadata-to-transfercontract-in-klever-sdk-node/3927)
**Author:** [@Sovkosov\_Ignat](https://forum.klever.org/u/Sovkosov_Ignat)\ **Replies:** 1\ **Last updated:** [July 15, 2025, 7:41pm UTC](https://forum.klever.org/t/adding-metadata-to-transfercontract-in-klever-sdk-node/3927 "2025-07-15T19:41:34Z")
Hi team! I’m working on a Node.js script using @klever/sdk-node@2.4.1 and need to add metadata (e.g., “Reward for delegation to klv15…”) to the data field of a TransferContract transaction, so it shows as a readable str… --- ## [Epoch change - Determine epoch leader](https://forum.klever.org/t/epoch-change-determine-epoch-leader/3879)
**Author:** [@CryptoJaeger](https://forum.klever.org/u/CryptoJaeger)\ **Replies:** 5\ **Last updated:** [July 11, 2025, 2:17pm UTC](https://forum.klever.org/t/epoch-change-determine-epoch-leader/3879 "2025-07-11T14:17:38Z")
How can I determine the leader of the epoch at the start of the epoch? ( I don´t mean the blockproducer) I would prefer a solution via my own Node API. --- ## [Issues with Multisignature Transfers on Klever – Anyone Else Affected?](https://forum.klever.org/t/issues-with-multisignature-transfers-on-klever-anyone-else-affected/3905)
**Author:** [@Zeferot](https://forum.klever.org/u/Zeferot)\ **Replies:** 12\ **Last updated:** [July 4, 2025, 3:04pm UTC](https://forum.klever.org/t/issues-with-multisignature-transfers-on-klever-anyone-else-affected/3905 "2025-07-04T15:04:46Z")
Hi everyone, I’m currently experiencing problems with executing multisignature transfers on the Klever blockchain. I’m trying to determine whether this is an isolated case or if more users are facing similar issues. H… --- ## [Signature Validation via Node.js](https://forum.klever.org/t/signature-validation-via-node-js/3880)
**Author:** [@shymelon](https://forum.klever.org/u/shymelon)\ **Replies:** 3\ **Last updated:** [June 23, 2025, 1:42pm UTC](https://forum.klever.org/t/signature-validation-via-node-js/3880 "2025-06-23T13:42:06Z")
Hi, I’m trying to validate a message signed on the client side using the backend (Node.js). Specifically, I’m using utils.validateSignature, but I’m encountering the following error: Invalid byte sequence Here’s a sam… --- ## [Inconsistent error with programmly generated wallets](https://forum.klever.org/t/inconsistent-error-with-programmly-generated-wallets/3876)
**Author:** [@shymelon](https://forum.klever.org/u/shymelon)\ **Replies:** 1\ **Last updated:** [June 20, 2025, 2:25pm UTC](https://forum.klever.org/t/inconsistent-error-with-programmly-generated-wallets/3876 "2025-06-20T14:25:14Z")
Hello Klever Team, I’ve encountered a strange issue where some wallets consistently throw exceptions when attempting to send a transaction. Interestingly, switching to another wallet resolves the problem immediately — e… --- ## [Issue with simultaneous transactions in sdk-node](https://forum.klever.org/t/issue-with-simultaneous-transactions-in-sdk-node/3873)
**Author:** [@shymelon](https://forum.klever.org/u/shymelon)\ **Replies:** 4\ **Last updated:** [June 18, 2025, 3:34pm UTC](https://forum.klever.org/t/issue-with-simultaneous-transactions-in-sdk-node/3873 "2025-06-18T15:34:23Z")
Hey Klever Team, When I am trying to process 2 or more transactions simultaneously (or with delay of about 2-3 seconds), both transactions are processed and I am getting successful status, but in reality one of transact… --- ## [Multisign error on Testnet](https://forum.klever.org/t/multisign-error-on-testnet/3803)
**Author:** [@Sietse\_hoogsteen](https://forum.klever.org/u/Sietse_hoogsteen)\ **Replies:** 3\ **Last updated:** [May 27, 2025, 12:49pm UTC](https://forum.klever.org/t/multisign-error-on-testnet/3803 "2025-05-27T12:49:32Z")
Hi all, I was trying out the Multisign functionality on Testnet in combinatie with the Klever Chrome Extension but I keep getting errors even for simple transactions. Can someone help me out? Raw txn: { "hash": "… --- ## [Should we move to Discord?](https://forum.klever.org/t/should-we-move-to-discord/3823)
**Author:** [@Duka](https://forum.klever.org/u/Duka)\ **Replies:** 0\ **Last updated:** [May 20, 2025, 5:35pm UTC](https://forum.klever.org/t/should-we-move-to-discord/3823 "2025-05-20T17:35:47Z")
Do you think we should move the dev area to Discord? poll The suggestion is keep using the forum for a source of knowledge for the Klever Ecosystem. All the developers support would be migrate to a private new Klever… --- ## [🚀 New Smart Contract Live on Klever Testnet: Certificate Issuance SC](https://forum.klever.org/t/new-smart-contract-live-on-klever-testnet-certificate-issuance-sc/3730)
**Author:** [@Duka](https://forum.klever.org/u/Duka)\ **Replies:** 17\ **Last updated:** [May 4, 2025, 12:15pm UTC](https://forum.klever.org/t/new-smart-contract-live-on-klever-testnet-certificate-issuance-sc/3730 "2025-05-04T12:15:45Z")
We’re excited to announce the release of yet another powerful smart contract in the Klever Blockchain testnet: :receipt: Certificate Issuance Smart Contract This contract is a key demonstration of how Klever Block… --- ## [Problems with token creation on Testnet](https://forum.klever.org/t/problems-with-token-creation-on-testnet/3755)
**Author:** [@C\_K](https://forum.klever.org/u/C_K)\ **Replies:** 2\ **Last updated:** [May 3, 2025, 3:13pm UTC](https://forum.klever.org/t/problems-with-token-creation-on-testnet/3755 "2025-05-03T15:13:38Z")
I’m the owner of a token on KDA chain and I’m having difficulties with the test net issuing my test tokens even though I’m logged in with the Creator wallet if I could get some guidance I’d appreciate it. Thanks :+1: --- ## [Important Notice: Migration from klever.finance to klever.org – Immediate Action Required](https://forum.klever.org/t/important-notice-migration-from-klever-finance-to-klever-org-immediate-action-required/3745)
**Author:** [@Duka](https://forum.klever.org/u/Duka)\ **Replies:** 1\ **Last updated:** [April 29, 2025, 5:28am UTC](https://forum.klever.org/t/important-notice-migration-from-klever-finance-to-klever-org-immediate-action-required/3745 "2025-04-29T05:28:07Z")
Dear developers and partners, We would like to inform you that we are deactivating the domain klever.finance and migrating all services to klever.org. This change has already been fully implemented across all our int… --- ## [Multiple contract with different types error](https://forum.klever.org/t/multiple-contract-with-different-types-error/3537)
**Author:** [@Sovkosov\_Ignat](https://forum.klever.org/u/Sovkosov_Ignat)\ **Replies:** 4\ **Last updated:** [March 26, 2025, 5:40pm UTC](https://forum.klever.org/t/multiple-contract-with-different-types-error/3537 "2025-03-26T17:40:04Z")
Hello everyone, I am trying to build a multicontract in web and it gives me an error "Gt: Multiple contracts of different types are not supported yet”, but it works on kleverscan, hence I’m assuming I am doing something … --- ## [Fix API Endpoint for Accurate FPR Rewards](https://forum.klever.org/t/fix-api-endpoint-for-accurate-fpr-rewards/3664)
**Author:** [@KIRA\_Gem](https://forum.klever.org/u/KIRA_Gem)\ **Replies:** 3\ **Last updated:** [March 31, 2025, 5:03pm UTC](https://forum.klever.org/t/fix-api-endpoint-for-accurate-fpr-rewards/3664 "2025-03-31T17:03:31Z")
Hi team! Is it possible to fix the endpoint for the summary balance of available rewards? These two endpoints return different data for FPR tokens. https://api.mainnet.klever.finance/v1.0/address/klv15galqpn3sv5xxdhkd2m… --- ## [Issue with kdaFee in @klever/sdk-node for KDA fee payments](https://forum.klever.org/t/issue-with-kdafee-in-klever-sdk-node-for-kda-fee-payments/3622)
**Author:** [@Sovkosov\_Ignat](https://forum.klever.org/u/Sovkosov_Ignat)\ **Replies:** 4\ **Last updated:** [March 26, 2025, 10:10pm UTC](https://forum.klever.org/t/issue-with-kdafee-in-klever-sdk-node-for-kda-fee-payments/3622 "2025-03-26T22:10:15Z")
Hey Klever team! I’m working on a project with @klever/sdk-node and trying to pay fees in KDA (like KIRA-31QW) instead of KLV. I started with v2.3.0 and now updated to the latest version, but I still can’t get kdaFee to… --- ## [Smart Contract with Localchain possible?](https://forum.klever.org/t/smart-contract-with-localchain-possible/3603)
**Author:** [@Joseph\_RudeBoy](https://forum.klever.org/u/Joseph_RudeBoy)\ **Replies:** 7\ **Last updated:** [March 24, 2025, 2:09pm UTC](https://forum.klever.org/t/smart-contract-with-localchain-possible/3603 "2025-03-24T14:09:47Z")
Is it possible to deploy smartcontract on localchain for testing? Or is it only possible via testnet at the moment? To make sure I have a working contract, I followed the steps for the crowdfunding example. Building wor… --- ## [Smart contract and token royalties](https://forum.klever.org/t/smart-contract-and-token-royalties/3610)
**Author:** [@Bill\_Butcher](https://forum.klever.org/u/Bill_Butcher)\ **Replies:** 3\ **Last updated:** [March 21, 2025, 6:41pm UTC](https://forum.klever.org/t/smart-contract-and-token-royalties/3610 "2025-03-21T18:41:26Z")
Hey @Nicollas @Duka , When operating with “Taxed token” (Transfer Royalties) in Smart Contract, the royalties are not working, or at least i didnt see it in raw data. Token has 10% transfer royalties. When sending to S… --- ## [Testnet Kleverscan Bug](https://forum.klever.org/t/testnet-kleverscan-bug/3514)
**Author:** [@CryptoJaeger](https://forum.klever.org/u/CryptoJaeger)\ **Replies:** 19\ **Last updated:** [March 20, 2025, 6:51pm UTC](https://forum.klever.org/t/testnet-kleverscan-bug/3514 "2025-03-20T18:51:51Z")
Here is a bug in Kleverscan: I create a transaction - SmartContract, Invoke and load the ABI. Then it shows me the 2 arguments. bet\_id and result, but when I want to set the result to False, it doesn’t want to create t… --- ## [SmartContract pay with kdaFee fails](https://forum.klever.org/t/smartcontract-pay-with-kdafee-fails/3604)
**Author:** [@CryptoJaeger](https://forum.klever.org/u/CryptoJaeger)\ **Replies:** 3\ **Last updated:** [March 20, 2025, 5:24pm UTC](https://forum.klever.org/t/smartcontract-pay-with-kdafee-fails/3604 "2025-03-20T17:24:44Z")
I want to pay a transaction fee with a kda and it fails. The transaction with KLV works without any problems. let selectedkdaFee = "KONG-3UEQ"; const txOptions = selectedkdaFee ? { kdaFee: selectedkdaFee } : undefined;… --- ## [Issues with the API: 503 Service Unavailable](https://forum.klever.org/t/issues-with-the-api-503-service-unavailable/3527)
**Author:** [@Enebish](https://forum.klever.org/u/Enebish)\ **Replies:** 3\ **Last updated:** [February 28, 2025, 12:56am UTC](https://forum.klever.org/t/issues-with-the-api-503-service-unavailable/3527 "2025-02-28T00:56:29Z")
Guys, we’re experiencing issues with access to the API proxy. Could you check it? @Duka --- ## [Smart Contract inconsistency](https://forum.klever.org/t/smart-contract-inconsistency/3512)
**Author:** [@CryptoJaeger](https://forum.klever.org/u/CryptoJaeger)\ **Replies:** 5\ **Last updated:** [February 24, 2025, 11:03pm UTC](https://forum.klever.org/t/smart-contract-inconsistency/3512 "2025-02-24T23:03:25Z")
In Klever Smart Contracts, there is inconsistent behavior with view functions (functions intended to read and return data). When these functions return simple types, such as a struct with a few fields, everything works a… --- ## [Smart Contract - Testnet Deployment error](https://forum.klever.org/t/smart-contract-testnet-deployment-error/3485)
**Author:** [@Sietse\_hoogsteen](https://forum.klever.org/u/Sietse_hoogsteen)\ **Replies:** 12\ **Last updated:** [February 20, 2025, 11:15am UTC](https://forum.klever.org/t/smart-contract-testnet-deployment-error/3485 "2025-02-20T11:15:41Z")
Hi all! I’m trying to deploy a Smart Contract to the testnet but I keep getting errors. If I want to deploy it using the KleverChain IDE it just keeps loading without giving me any feedback. If I try the transaction us… --- ## [Help Needed with NFT Minter App: ITO and Transaction Issues](https://forum.klever.org/t/help-needed-with-nft-minter-app-ito-and-transaction-issues/3342)
**Author:** [@Peter\_Deri](https://forum.klever.org/u/Peter_Deri)\ **Replies:** 1\ **Last updated:** [January 14, 2025, 7:59am UTC](https://forum.klever.org/t/help-needed-with-nft-minter-app-ito-and-transaction-issues/3342 "2025-01-14T07:59:57Z")
Hi Everyone, Unfortunately a strange error occurs when I try to post into developers topic hence I post there. I’m trying to develop an NFT minter app and have created an NFT collection: View Collection I also set up… --- ## [Protobuf and FreezeContract](https://forum.klever.org/t/protobuf-and-freezecontract/3226)
**Author:** [@CryptoJaeger](https://forum.klever.org/u/CryptoJaeger)\ **Replies:** 2\ **Last updated:** [December 10, 2024, 6:19pm UTC](https://forum.klever.org/t/protobuf-and-freezecontract/3226 "2024-12-10T18:19:04Z")
The protobuf documents do not contain a BucketID for the FreezeContract. If I query the TX at Node directly, the BucketID is indeed present. Am I making a mistake? Kleverchain ProtoBuf Document message FreezeContract … --- ## [Suggestions for Improving KVM Usability and Developer Experience](https://forum.klever.org/t/suggestions-for-improving-kvm-usability-and-developer-experience/3169)
**Author:** [@XPort\_App](https://forum.klever.org/u/XPort_App)\ **Replies:** 1\ **Last updated:** [December 1, 2024, 3:57pm UTC](https://forum.klever.org/t/suggestions-for-improving-kvm-usability-and-developer-experience/3169 "2024-12-01T15:57:06Z")
Unfortunately, I didn’t pay enough attention to where discussions about the KVM should take place, so most of our interactions with the team happened primarily on Slack. Nevertheless, we’ve compiled some points that migh… --- ## [How can a users check if a SC works?](https://forum.klever.org/t/how-can-a-users-check-if-a-sc-works/3161)
**Author:** [@XPort\_App](https://forum.klever.org/u/XPort_App)\ **Replies:** 1\ **Last updated:** [November 30, 2024, 7:56am UTC](https://forum.klever.org/t/how-can-a-users-check-if-a-sc-works/3161 "2024-11-30T07:56:40Z")
Hi guys. So far, all of the SC’s I’ve encountered have no KLV and Show no transactions. Same happens to mine even though I can get some answers (in Hex) from it. (for instance { “data”: { “data”: “7b4b4952413a7b303a… --- ## [Need some JavaScript help for marketplace buy transaction](https://forum.klever.org/t/need-some-javascript-help-for-marketplace-buy-transaction/1409)
**Author:** [@marketdev](https://forum.klever.org/u/marketdev)\ **Replies:** 15\ **Last updated:** [May 29, 2024, 5:13pm UTC](https://forum.klever.org/t/need-some-javascript-help-for-marketplace-buy-transaction/1409 "2024-05-29T17:13:16Z")
Hello, so I have created a marketplace and got its ID on testnet API. I have created collections and listed NFTs. Now, I’m trying to test buy feature with a different wallet address. How can I trigger NFT buy feature w… --- ## [How to Write Benchmark Tests for Your Golang Functions](https://forum.klever.org/t/how-to-write-benchmark-tests-for-your-golang-functions/2122)
**Author:** [@Duka](https://forum.klever.org/u/Duka)\ **Replies:** 3\ **Last updated:** [October 17, 2024, 7:18pm UTC](https://forum.klever.org/t/how-to-write-benchmark-tests-for-your-golang-functions/2122 "2024-10-17T19:18:05Z")
--- ## [Ito buy gives account error](https://forum.klever.org/t/ito-buy-gives-account-error/1484)
**Author:** [@Better\_World](https://forum.klever.org/u/Better_World)\ **Replies:** 3\ **Last updated:** [June 24, 2024, 6:14pm UTC](https://forum.klever.org/t/ito-buy-gives-account-error/1484 "2024-06-24T18:14:19Z")
problem solved - thank you --- ## [How can I add my NFT assets to "assets": {} in marketplace API?](https://forum.klever.org/t/how-can-i-add-my-nft-assets-to-assets-in-marketplace-api/1393)
**Author:** [@marketdev](https://forum.klever.org/u/marketdev)\ **Replies:** 4\ **Last updated:** [May 27, 2024, 3:45pm UTC](https://forum.klever.org/t/how-can-i-add-my-nft-assets-to-assets-in-marketplace-api/1393 "2024-05-27T15:45:54Z")
Hello, I was able to create a marketplace on testnet. I created NFT asset and minted it several times but they don’t automatically show up on my marketplace API. How can I add my NFT assets to “assets”: {} section on API… [Previous page](https://forum.klever.org/c/kleverchain/developers/9.md) [Next page](https://forum.klever.org/c/kleverchain/developers/9.md?page=2)