Build an FT post-condition

Create post-conditions for fungible token transfers to ensure exact amounts are transferred as expected

import { Pc } from '@stacks/transactions';



// Create a post-condition for fungible token transfers

const postCondition = Pc.principal("ST1PQHQKV0RJXZFY1DGX8MNSNYVE3VGZJSRTPGZGM")

  .willSendGte(500) // Amount in token's smallest unit

  .ft("ST1HTBVD3JG9C05J7HBJTHGR0GGW7KXW28M5JS8QE.token-ft", "my-token");



// Use in transaction options

const txOptions = {

  // ... other transaction options

  postConditions: [postCondition],

  postConditionMode: PostConditionMode.Deny,

};

Use cases

  • Securing fungible token transfers with amount validation
  • Protecting users from unexpected token transfers in DeFi protocols
  • Ensuring token swaps happen with expected amounts

Key concepts

The Pc builder for fungible tokens accepts:

  • .ft() - Takes two parameters:
    • Contract address with asset name (e.g., "contract.asset-name")
    • Token name as defined in the contract

Contents

Use casesKey concepts