Money

Sending NEAR

Transfer value by returning a Promise. Promise::new(to).transfer(amount) replaces address.call{value:} — and it runs after your method, not during it.

In Solidity you push value out mid-function with address.call{value: v}(""). On NEAR, sending NEAR is an action: you build a Promise for the recipient, attach a transfer, and return it. The transfer is scheduled to run *after* your method finishes.

Forward the attached deposit

Solidity

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

contract Payout {
    function pay(address payable to) external payable {
        (bool ok, ) = to.call{value: msg.value}("");
        require(ok, "transfer failed");
    }
}

Rust

use near_sdk::{near, env, AccountId, Promise};

#[near(contract_state)]
#[derive(Default)]
pub struct Payout {}

#[near]
impl Payout {
    #[payable]
    pub fn pay(&mut self, to: AccountId) -> Promise {
        let amount = env::attached_deposit();
        Promise::new(to).transfer(amount)
    }
}

Coming from EVM

address.call{value: v}("") / .transfer(v) ↔ Promise::new(to).transfer(amount). Returning the Promise from the method is what schedules it.

The transfer runs in a separate receipt after your code returns, so there is no re-entrancy *into the middle of* your method — the classic checks-effects-interactions reentrancy bug does not arise the same way. (Callbacks, in the cross-contract chapter, are where you handle the result.)

Amounts are NearToken. env::attached_deposit() is what the caller sent; env::account_balance() is the contract's balance. You cannot send away the NEAR that storage staking locks behind your state.