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NFT Operator Calldata Preflight Validator
x402
NFT Operator Calldata Preflight Validator is a paid API for AI agents from vm5-openapi-x402.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-25).
Validates and decodes EVM NFT operator authorization calldata (setApprovalForAll) before submission, returning decoded parameters and safety warnings without executing any transaction.
Price / call$0.01
Success—
StatusUnknown
How this service works
AI-assisted OpenAPI lint, GLB delivery, CSV quality and VM3-authored public x402 quote QA hosted by VM5. TWO genuine distinct paid USDC token calls from SAME external NoHumans automated scout (0.01+0.005=0.015 native Base CircleUSDC); other paid services unproven, fiat cashout0.
Output
Returns a JSON object with: decoded operator address and approval flag, the function selector (e.g. 0xa22cb465), interpreted NFT token standard (ERC-721 or ERC-1155), array of safety warnings with codes (e.g. COLLECTION_WIDE_OPERATOR_APPROVAL), warning count, confirmation that no transaction was sent, no RPC/wallet/private data was used, whether the current approval is confirmed on-chain, and the USDC amount charged for the call.
Example use cases
Verify suspicious NFT approval request
“I just got a transaction request asking me to approve an operator on my NFT collection. Can you decode this calldata and tell me what operator address it's approving and whether it's flagging any collection-wide approval warnings before I sign?”
Audit marketplace integration calldata
“We're integrating an NFT marketplace and want to validate the setApprovalForAll calldata it generates — can you run a preflight on it to confirm the function selector is correct and the operator address matches what we expect?”
Safety check before bulk NFT listing
“Before I grant operator approval to list all my ERC-721 tokens on this platform, can you decode and check the calldata they sent me for any warnings, and confirm whether the approval is set to true and what standard it's using?”
Technical details
Endpoint
GEThttps://vm5-openapi-x402.onrender.com/v1/nft-operator-calldata-preflight?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to decode and safety-check EVM NFT operator authorization (setApprovalForAll) calldata before signing, particularly when you want to detect collection-wide approval risks or verify operator addresses without executing any on-chain transaction. Best suited for wallets, NFT marketplaces, or security tools that need lightweight preflight validation at $0.01 USDC per call.
Side effects
- Invalid or malformed calldata input returns error response
- Unrecognized function selector may result in incomplete decoding
- Missing required properties parameter yields empty or generic response
- Endpoint may be unavailable if Render.com free-tier instance is sleeping
- Payment failure via x402 protocol blocks access to response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"kind": "evm_nft_unsigned_operator_authorization_preflight",
"paid": true,
"action": "setApprovalForAll",
"decoded": {
"approved": true,
"operator": "0x000000000000000000000000000000000000dead"
},
"selector": "0xa22cb465",
"warnings": [
{
"code": "COLLECTION_WIDE_OPERATOR_APPROVAL"
}
],
"chargedUSDC": "0.01",
"exampleOnly": true,
"warningCount": 1,
"noTransactionSent": true,
"interpretedStandard": "ERC-721_OR_ERC-1155_DECLARED_BY_CALLER",
"isCurrentApprovalConfirmedOnchain": false,
"independentlyPaidBuyersForNewRoute": 0,
"noRpcWalletPrivateDataOrBlockchainCalls": true
}
}Tags
x402
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