Add estimate fee tx #1279
Add estimate fee tx #1279
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Pull request overview
This PR adds comprehensive documentation and code examples for calculating transaction fees on Polkadot-based chains. It provides practical examples using both Polkadot-API (PAPI) and Polkadot.js API, along with instructions for the Polkadot-JS Apps UI.
Key Changes:
- Complete tutorial documentation covering fee calculation concepts and prerequisites
- TypeScript code examples for both PAPI and Polkadot.js API with detailed explanations
- Expected output samples demonstrating fee estimation results
Reviewed changes
Copilot reviewed 5 out of 6 changed files in this pull request and generated 5 comments.
Show a summary per file
| File | Description |
|---|---|
.chain-interactions/send-transactions/calculate-transaction-fees.md |
Main tutorial document explaining transaction fee calculation with three different approaches (PAPI, Polkadot.js API, and UI) |
.snippets/code/chain-interactions/send-transactions/calculate-transaction-fees/polkadotjs-fee-calculator.ts |
Polkadot.js API implementation for fee estimation |
.snippets/code/chain-interactions/send-transactions/calculate-transaction-fees/polkadotjs-fee-calculator-output.html |
Expected terminal output for the Polkadot.js API example |
.snippets/code/chain-interactions/send-transactions/calculate-transaction-fees/papi-fee-calculator.ts |
PAPI implementation for fee estimation |
.snippets/code/chain-interactions/send-transactions/calculate-transaction-fees/papi-fee-calculator-output.html |
Expected terminal output for the PAPI example |
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| const bobAddress = "INSERT_BOB_ADDRESS"; | ||
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| // Amount to transfer (1 DOT = 10^10 plancks) | ||
| const amount = 1_000_000_000_000n; // 1 DOT |
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The comment states "1 DOT = 10^10 plancks" and the amount is set to 1_000_000_000_000n (1 trillion), but 10^10 is 10 billion, not 1 trillion. The value should be 10_000_000_000n to represent 1 DOT, or the comment should state "1 DOT = 10^12 plancks" if 1 trillion is correct.
| const amount = 1_000_000_000_000n; // 1 DOT | |
| const amount = 10_000_000_000n; // 1 DOT |
| const bobAddress = "INSERT_BOB_ADDRESS"; | ||
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| // Amount to transfer (1 DOT = 10^10 plancks) | ||
| const amount = 1_000_000_000_000n; // 1 DOT |
There was a problem hiding this comment.
The comment states "1 DOT = 10^10 plancks" and the amount is set to 1_000_000_000_000n (1 trillion), but 10^10 is 10 billion, not 1 trillion. The value should be 10_000_000_000n to represent 1 DOT, or the comment should state "1 DOT = 10^12 plancks" if 1 trillion is correct.
| const amount = 1_000_000_000_000n; // 1 DOT | |
| const amount = 10_000_000_000n; // 1 DOT |
| To see fees before submitting a transfer: | ||
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| 1. Navigate to **Accounts** > **Accounts** in the top menu | ||
| 2. Choice an account and click **send** |
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Typo: "Choice" should be "Choose".
| 2. Choice an account and click **send** | |
| 2. Choose an account and click **send** |
| <span data-ty>Transaction amount: 100 DOT</span> | ||
| <span data-ty>Total deducted: 100.0014668864 DOT</span> |
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The output shows "Transaction amount: 100 DOT", but the code sets the amount to 1_000_000_000_000n which, based on the conversion factor used (/ 1e10), would output 100 DOT. However, the comment in the code states this is "1 DOT". Either the comment should say "100 DOT" or the amount should be 10_000_000_000n for 1 DOT (assuming 10^10 plancks per DOT).
| <span data-ty>Transaction amount: 100 DOT</span> | |
| <span data-ty>Total deducted: 100.0014668864 DOT</span> | |
| <span data-ty>Transaction amount: 1 DOT</span> | |
| <span data-ty>Total deducted: 1.0014668864 DOT</span> |
| <span data-ty>Transaction amount: 100 DOT</span> | ||
| <span data-ty>Total deducted: 100.0014668864 DOT</span> |
There was a problem hiding this comment.
The output shows "Transaction amount: 100 DOT", but the code sets the amount to 1_000_000_000_000n which, based on the conversion factor used (/ 1e10), would output 100 DOT. However, the comment in the code states this is "1 DOT". Either the comment should say "100 DOT" or the amount should be 10_000_000_000n for 1 DOT (assuming 10^10 plancks per DOT).
| <span data-ty>Transaction amount: 100 DOT</span> | |
| <span data-ty>Total deducted: 100.0014668864 DOT</span> | |
| <span data-ty>Transaction amount: 1 DOT</span> | |
| <span data-ty>Total deducted: 1.0014668864 DOT</span> |
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