stx_callContract

Requests the connected wallet to sign and broadcast a Clarity smart contract function call.

---

Usage

import { request } from '@stacks/connect';
import { Cl } from '@stacks/transactions';

const result = await request('stx_callContract', {
  contract: 'SP2JXKMSH007NPYAQHKJPQMAQYAD90NQGTVJVQ02.my-contract',
  functionName: 'transfer',
  functionArgs: [
    Cl.uint(100),
    Cl.standardPrincipal('SP2JXKMSH007NPYAQHKJPQMAQYAD90NQGTVJVQ02'),
    Cl.standardPrincipal('SP1HTBVD3JG9C05J7HBJTHGR0GGW7KXW28M5JS8QE'),
  ],
  network: 'mainnet',
});

console.log('Transaction ID:', result.txid);

import { request } from '@stacks/connect';

// Using hex-encoded function args
const result = await request('stx_callContract', {
  contract: 'SP2JXKMSH007NPYAQHKJPQMAQYAD90NQGTVJVQ02.my-contract',
  functionName: 'get-balance',
  functionArgs: [],
  postConditionMode: 'allow',
});

Notes

• The functionArgs array can contain either ClarityValue objects (from @stacks/transactions) or hex-encoded strings. Clarity values are automatically serialized before being sent to the wallet.
• Post conditions can be provided as JSON objects or hex-encoded strings.

Reference Link

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Signature

function request(
  'stx_callContract',
  params: CallContractParams
): Promise<TransactionResult>

---

Returns

TransactionResult

interface TransactionResult {
  txid?: string;
  transaction?: string;
}

Property	Type	Description
txid	string (optional)	The transaction ID of the broadcasted transaction.
transaction	string (optional)	The raw signed transaction hex.

---

Parameters

contract (required)

• Type: ContractIdString

The fully qualified contract identifier in the format address.contract-name (e.g. 'SP2JXKMSH007NPYAQHKJPQMAQYAD90NQGTVJVQ02.my-contract').

functionName (required)

• Type: string

The name of the public or read-only function to call.

functionArgs (optional)

• Type: string[] | ClarityValue[]

An array of function arguments. These can be ClarityValue objects (constructed using Cl helpers from @stacks/transactions) or hex-encoded Clarity value strings.

address (optional)

• Type: AddressString

The recommended sender address to use. Wallets may not implement this for privacy reasons.

network (optional)

• Type: NetworkString

The network to use for the transaction (e.g. 'mainnet', 'testnet', 'devnet').

fee (optional)

• Type: Integer (number | bigint | string)

A custom fee for the transaction (in microstacks).

nonce (optional)

• Type: Integer (number | bigint | string)

A custom nonce for the transaction.

sponsored (optional)

• Type: boolean

Whether the transaction should be sponsored.

postConditions (optional)

• Type: (string | PostCondition)[]

An array of post conditions to attach to the transaction. Each entry can be a hex-encoded string or a JSON PostCondition object.

postConditionMode (optional)

• Type: PostConditionModeName

The post condition mode: 'allow' or 'deny'. Defaults to 'deny' in most wallets.