When building applications on the XRP Ledger, testing transactions before committing them to the network is critical - especially for high-value or complex operations. To address this need, we're introducing Simulate, a new way to execute a "dry run" of transactions without actually submitting them to the network.
Why Simulate?
Traditionally, developers testing transactions on the XRPL have relied on testnets or devnets. However, these environments may not always mirror mainnet conditions, particularly for transactions that involve real-time market liquidity or large-scale asset transfers. The simulate method bridges this gap by providing a realistic preview of how a transaction would behave on mainnet - without the risks of actual submission.
Key Features of Simulate
- No Actual Submission: The transaction is never broadcasted, ensuring it does not affect account balances or ledger state.
- Unsigned Transactions Only: This prevents accidental or unauthorized transactions from being executed.
- Detailed Response Format: The response includes metadata and affected ledger objects, helping users understand potential outcomes.
How It Works
To use the simulate method, users submit a transaction in the same format as a regular submission request, but instead of committing it to the XRP Ledger, the server processes it internally and returns a simulated result. This allows developers to refine their transaction structure, preview fees, and verify expected outputs before making irreversible changes. The simulation replicates the exact conditions of a real submission, offering a reliable prediction of transaction behavior at a specific point in time.
Use Cases
- Pre-flight checks for high-value transactions: Ensure that complex transactions behave as expected before execution.
- Avoiding unintended interactions with the DEX: Projects distributing tokens and executing large batches of transactions can use Simulate to verify how these will interact with the DEX, helping prevent unexpected financial losses.
- Institutional-grade reliability: Enterprises integrating XRPL into their workflows can incorporate Simulate into their transaction pipelines to ensure smooth execution and prevent failures.
- Debugging transaction failures: Instead of submitting a transaction and waiting for an error, simulate provides immediate feedback.
Looking Ahead
Simulate enhances the XRPL developer experience by offering a safe and efficient way to test transactions. As we continue improving XRPL tooling, we welcome feedback from the developer community to refine this feature further.
Watch our video demo:
Learn more: https://github.com/XRPLF/XRPL-Standards/tree/master/XLS-0069-simulate
Documentation: https://opensource.ripple.com/docs/xls-69d
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