build_transaction
Create unsigned blockchain transactions with gas estimates for sending tokens or native currency between addresses on supported networks.
Instructions
Build a transaction object ready for signing.
Args: from_address: Sender wallet address to_address: Recipient wallet address value: Amount to send (in token units or wei) chain: Blockchain network token_address: Optional ERC-20 token address (native token if not provided)
Returns: Unsigned transaction object with gas estimates.
Price: $0.15
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| from_address | Yes | ||
| to_address | Yes | ||
| value | Yes | ||
| chain | No | ethereum | |
| token_address | No |
Output Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| result | Yes |
Implementation Reference
- coinrailz_mcp/__init__.py:510-541 (handler)The handler function 'build_transaction' that builds a transaction using the 'transaction-builder' service.
async def build_transaction( from_address: str, to_address: str, value: str, chain: str = "ethereum", token_address: str = None ) -> str: """ Build a transaction object ready for signing. Args: from_address: Sender wallet address to_address: Recipient wallet address value: Amount to send (in token units or wei) chain: Blockchain network token_address: Optional ERC-20 token address (native token if not provided) Returns: Unsigned transaction object with gas estimates. Price: $0.15 """ payload = { "from": from_address, "to": to_address, "value": value, "chain": chain } if token_address: payload["tokenAddress"] = token_address result = await call_coinrailz_service("transaction-builder", payload) return json.dumps(result, indent=2)