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EVM Collection-Wide NFT Approval Calldata Encoder (High Risk)
x402
EVM Collection-Wide NFT Approval Calldata Encoder (High Risk) 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).
Builds EVM calldata for setApprovalForAll NFT operations, flagging the transaction as high risk before any signing occurs
Price / call$0.01
Success—
StatusUnknown
How this service works
Build collection-wide NFT approval calldata, flagged as high risk
Output
Returns encoded EVM calldata for a setApprovalForAll function call along with a high-risk flag indicating that this operation grants an operator unrestricted access to an entire NFT collection. The agent receives the hex-encoded transaction data ready to be signed and broadcast, plus risk metadata warning of the broad permissions being granted.
Example use cases
NFT marketplace listing approval
“I want to list my entire CryptoPunks collection on a marketplace — can you encode the setApprovalForAll calldata to approve the marketplace contract 0xDEF...456 as operator for my NFT contract at 0xABC...123, and make sure the high-risk flag is included so I know what I'm signing?”
DeFi protocol NFT collateral setup
“I need to approve a lending protocol at 0x789...ABC to manage all NFTs in my ERC-721 contract 0x111...222 — please build the collection-wide approval calldata and flag it as high risk before I submit it.”
Revoking operator access across a collection
“Can you encode the calldata to revoke setApprovalForAll for operator 0xBAD...999 on my NFT collection contract 0x333...444, setting approval to false, and include the high-risk warning in the output?”
Technical details
Endpoint
POSThttps://evm-canon-base.onrender.com/encode/approve-allWhen to prefer
Use this endpoint when you need to encode setApprovalForAll calldata for NFT contracts (ERC-721 or ERC-1155) and want a built-in high-risk warning surfaced before the transaction is signed. Prefer this over generic calldata encoders when working specifically with collection-wide NFT approvals and you want the risk flag to be part of the encoded output metadata rather than a separate audit step.
Side effects
- Invalid contract address format returns a 400 error
- Invalid operator address returns a validation error
- Missing required fields (contract, operator, approved boolean) returns a 400 bad request
- Malformed request body returns a parsing error
- Service unavailable on Render cold start returns a 503 or timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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