--- category: Chain Interactions description: How to query on-chain data, send transactions, communicate across chains, and manage tokens and accounts on Polkadot-based chains. page_count: 12 token_estimate: 1773 updated: '2026-06-25T12:38:13.291384+00:00' --- ## Calculate Transaction Fees https://docs.polkadot.com/chain-interactions/send-transactions/calculate-transaction-fees.md Learn how to calculate transaction fees on Polkadot using Polkadot-API, Polkadot.js API, and the Polkadot.js Apps UI to estimate transfer costs. ### Sections - Introduction `#introduction` - Prerequisites `#prerequisites` - Polkadot-API (PAPI) `#polkadot-api-papi` - Polkadot.js API `#polkadotjs-api` - Polkadot.js Apps Interface `#polkadotjs-apps-interface` - Estimate Fees via Transfer Interface `#estimate-fees-via-transfer-interface` - Where to Go Next `#where-to-go-next` --- ## Chain Interactions Overview https://docs.polkadot.com/chain-interactions.md Learn how to query data, send transactions, enable cross-chain communication, and manage accounts across the Polkadot ecosystem. ### Sections - Introduction `#introduction` - Core Interaction Patterns `#core-interaction-patterns` - Query On-Chain Data `#query-on-chain-data` - Send Transactions `#send-transactions` - Send Cross-Chain Transactions `#send-cross-chain-transactions` - Manage Tokens `#manage-tokens` - Manage Accounts `#manage-accounts` - Development Tools and SDKs `#development-tools-and-sdks` --- ## Convert Assets on Asset Hub https://docs.polkadot.com/chain-interactions/token-operations/convert-assets.md A guide detailing the step-by-step process of converting assets on Asset Hub, helping users efficiently navigate asset management on the platform. ### Sections - Introduction `#introduction` - Prerequisites `#prerequisites` - Create a Liquidity Pool `#create-a-liquidity-pool` - Add Liquidity to a Pool `#add-liquidity-to-a-pool` - Swap Assets `#swap-assets` - Swap from an Exact Amount of Tokens `#swap-from-an-exact-amount-of-tokens` - Swap to an Exact Amount of Tokens `#swap-to-an-exact-amount-of-tokens` - Withdraw Liquidity from a Pool `#withdraw-liquidity-from-a-pool` - Test Environment Setup `#test-environment-setup` --- ## Create an Account https://docs.polkadot.com/chain-interactions/accounts/create-account.md Step-by-step guide to creating Polkadot accounts using different programming languages and libraries, including JavaScript, Python, and Rust examples. ### Sections - Introduction `#introduction` - Prerequisites `#prerequisites` - Use JavaScript/TypeScript `#use-javascripttypescript` - Python `#python` - Rust `#rust` - Where to Go Next `#where-to-go-next` --- ## Pay Transaction Fees with Different Tokens https://docs.polkadot.com/chain-interactions/send-transactions/pay-fees-with-different-tokens.md Learn how to send a DOT transfer transaction while paying the fees using a different token on Polkadot Hub using multiple SDKs. ### Sections - Introduction `#introduction` - Prerequisites `#prerequisites` - Local Polkadot Hub Setup `#local-polkadot-hub-setup` - Set Up Your Project `#set-up-your-project` - Implementation `#implementation` - Import Dependencies and Define Constants `#import-dependencies-and-define-constants` - Create a Signer and Connect `#create-a-signer-and-connect` - Create the Transaction `#create-the-transaction` - Sign and Submit with Alternative Fee Payment `#sign-and-submit-with-alternative-fee-payment` - Full Code `#full-code` - Run the Script `#run-the-script` - Expected Output `#expected-output` - Conclusion `#conclusion` - Where to Go Next `#where-to-go-next` --- ## Query Account Information with SDKs https://docs.polkadot.com/chain-interactions/accounts/query-accounts.md Learn how to query account information using five popular SDKs—Polkadot API (PAPI), Polkadot.js API, Dedot, Python Substrate Interface, and Subxt. ### Sections - Introduction `#introduction` - Prerequisites `#prerequisites` - Query Account Information `#query-account-information` - Understanding Account Data `#understanding-account-data` - Where to Go Next `#where-to-go-next` --- ## Query On-Chain State with SDKs https://docs.polkadot.com/chain-interactions/query-data/query-sdks.md Learn how to query on-chain storage data on Polkadot Hub using PAPI, Polkadot.js, Dedot, Python Substrate Interface, and Subxt. ### Sections - Introduction `#introduction` - Query On-Chain Data `#query-on-chain-data` - Where to Go Next `#where-to-go-next` --- ## Query On-Chain State with Sidecar REST API https://docs.polkadot.com/chain-interactions/query-data/query-rest.md Learn how to query on-chain state on Polkadot using the Sidecar REST API with curl, including account balances, asset data, and block information. ### Sections - Introduction `#introduction` - Prerequisites `#prerequisites` - Running Sidecar Locally `#running-sidecar-locally` - Public Sidecar Endpoints `#public-sidecar-endpoints` - Query Account Balance `#query-account-balance` - Query Asset Balances `#query-asset-balances` - Query Asset Metadata `#query-asset-metadata` - Query Asset Details `#query-asset-details` - Query Foreign Asset Balances `#query-foreign-asset-balances` - Query Block Information `#query-block-information` - API Reference `#api-reference` - Where to Go Next `#where-to-go-next` --- ## Register a Local Asset https://docs.polkadot.com/chain-interactions/token-operations/register-local-asset.md Learn how to register a local asset on Polkadot Hub, including prerequisites, deposits, and step-by-step instructions using Polkadot.js Apps. ### Sections - Introduction `#introduction` - Prerequisites `#prerequisites` - Register a Local Asset `#register-a-local-asset` - Verify Asset Registration `#verify-asset-registration` - Test Setup Environment `#test-setup-environment` --- ## Send Transactions with SDKs https://docs.polkadot.com/chain-interactions/send-transactions/with-sdks.md Learn how to construct, sign, and submit transactions using PAPI, Polkadot.js, Dedot, Python Substrate Interface, and Subxt. ### Sections - Introduction `#introduction` - Prerequisites `#prerequisites` - Send Transactions `#send-transactions` - Where to Go Next `#where-to-go-next` --- ## Store and Retrieve Data on the Bulletin Chain https://docs.polkadot.com/chain-interactions/store-data/bulletin-chain.md Learn how to store and retrieve an image on the Polkadot Bulletin Chain using the Console UI or PAPI, with step-by-step instructions. ### Sections - Prerequisites `#prerequisites` - Get Authorization `#get-authorization` - Store Your Image `#store-your-image` - Verify Your Stored Image `#verify-your-stored-image` - Retrieve Your Data `#retrieve-your-data` - Renew Your Data `#renew-your-data` - Where to Go Next `#where-to-go-next` --- ## XCM Fee Estimation https://docs.polkadot.com/chain-interactions/send-transactions/interoperability/estimate-xcm-fees.md This tutorial demonstrates how to estimate the fees for teleporting assets from the Polkadot Hub TestNet to the Paseo People Chain. ### Sections - Introduction `#introduction` - Fee Mechanism `#fee-mechanism` - Environment Setup `#environment-setup` - Client and API Setup `#client-and-api-setup` - Fee Estimation Function `#fee-estimation-function` - Complete Implementation `#complete-implementation` - Full Code `#full-code` - Running the Script `#running-the-script` - Conclusion `#conclusion`