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EVM ERC-20 transferFrom Calldata Builder
x402
EVM ERC-20 transferFrom Calldata Builder is a paid API for AI agents from evm-canon-base.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Encodes delegated ERC-20 transferFrom calldata for on-chain execution, spending a previously granted allowance to move tokens from one address to another.
Price / call$0.01
Success—
StatusUnknown
How this service works
Build delegated ERC-20 transferFrom calldata
Output
A hex-encoded ABI calldata string representing the transferFrom(address from, address to, uint256 amount) function call, ready to be submitted as the 'data' field of an EVM transaction to the relevant ERC-20 token contract.
Example use cases
DeFi protocol spending user allowance
“Encode a transferFrom call to move 1000 USDT from 0xUser123 to my vault contract at 0xVaultABC, using the approved spender 0xProtocolXYZ — give me the raw calldata hex.”
Automated payroll from pre-approved wallet
“I need the transferFrom calldata to pull 250 DAI from 0xEmployerWallet to 0xEmployeeWallet — the payroll contract at 0xPayrollContract has the allowance.”
Agent-executed token sweep
“Generate transferFrom calldata to sweep 750 WETH from 0xSourceWallet to 0xTreasuryWallet using the spender approval already granted to 0xSweeperBot.”
Technical details
Endpoint
POSThttps://evm-canon-base.onrender.com/encode/transfer-fromWhen to prefer
Choose this endpoint when you need to programmatically build ERC-20 transferFrom calldata without running a local ABI encoder or Web3 library. It is especially useful for agents operating in environments without EVM tooling, or when constructing transactions for delegated token transfers where a spender allowance has already been approved via approve() or permit().
Side effects
- Invalid or non-checksum Ethereum address returns a 400 error
- Amount not parseable as a uint256 returns encoding error
- Missing required fields (from, to, amount, token) returns validation error
- Network or service unavailability returns 5xx
- Payment not provided or insufficient returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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