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ERC-721 Safe Transfer Calldata Builder
x402
ERC-721 Safe Transfer 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 2026-09-15).
Encodes ERC-721 safeTransferFrom calldata for NFT transfers on EVM-compatible chains
Price / call$0.01
Success—
StatusUnknown
How this service works
Build ERC-721 safe transfer calldata
Output
Returns hex-encoded ABI calldata for an ERC-721 safeTransferFrom function call, ready to be submitted as the data field of an EVM transaction. Includes the 4-byte function selector and encoded parameters for from address, to address, and token ID.
Example use cases
NFT wallet transfer automation
“I need to move NFT token ID 7 from my wallet 0xAaAa...1111 to my cold storage at 0xBbBb...2222 — the NFT contract is at 0xCcCc...3333. Can you build the safeTransferFrom calldata for me?”
Agent-driven NFT marketplace listing
“My marketplace bot needs to transfer NFT token ID 999 from seller 0xSell...0001 to buyer 0xBuye...0002 on contract 0xNFTc...0003 — generate the ERC-721 safe transfer calldata so we can broadcast the transaction.”
Batch NFT migration script
“I'm migrating NFTs to a new contract and need safeTransferFrom calldata for token ID 512, transferring from 0xOld...aaaa to 0xNew...bbbb on the ERC-721 contract 0xContr...cccc — can you encode that for me?”
Technical details
Endpoint
POSThttps://evm-canon-base.onrender.com/encode/nft-transferWhen to prefer
Choose this endpoint when you need to programmatically generate ERC-721 safeTransferFrom calldata without running a local Ethereum library. Ideal for agents or serverless workflows that need raw transaction data for NFT transfers without a full Web3 stack. Prefer this over manual ABI encoding when working with Base or other EVM chains in lightweight environments.
Side effects
- Invalid or non-checksummed Ethereum address returns a 400 error
- Missing required fields (contract, from, to, tokenId) cause validation errors
- Malformed token ID (non-integer or negative) causes a 400 error
- Service unavailable on Render cold start may cause initial latency or timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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