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Solidity abi.encodePacked Equivalent
x402
Solidity abi.encodePacked Equivalent is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-29).
Encodes typed Solidity values using abi.encodePacked (tight, non-padded ABI encoding), returning the packed hex result along with a payment receipt.
Price / call$0.002
Success—
StatusUnknown
How this service works
Solidity abi.encodePacked equivalent — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object with ok:true, the encoding type label 'encode-packed', the packed hex string result, and a payment receipt containing a transaction hash, amount in USD, and a unique receipt ID.
Example use cases
Off-chain keccak256 leaf for Merkle tree
“I'm building a Merkle tree for an airdrop and need abi.encodePacked on types ['address','uint256'] with values ['0xDeadBeef00000000000000000000000000000001', 500] so I can hash the leaf node off-chain.”
Signature payload for EIP-191 verification
“Help me pack the values for a signed message — types are ['bytes32','address','uint256'] and values are ['0xabc...def', '0x1234...5678', 42] — I need the packed encoding to feed into my signing script.”
Reproduce Solidity hash from backend
“My smart contract does keccak256(abi.encodePacked(uint8, address, bytes32)) — can you run encodePacked for me with types ['uint8','address','bytes32'] and values [1, '0xDead000000000000000000000000000000000001', '0xcafe...'] so I can verify the hash matches on the backend?”
Technical details
Endpoint
POSThttps://twin.unykorn.org/encode-packed?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need Solidity-compatible abi.encodePacked (tight, non-padded encoding) outside of the EVM — such as computing keccak256 hashes off-chain, verifying on-chain signatures, or building Merkle tree leaves. Prefer this over a full abi.encode when you specifically need packed (no padding) encoding, which is what Solidity's abi.encodePacked produces. It is part of the UnyKorn operator network and charges a small USDC microfee per call, making it suitable for pay-per-use agent workflows.
Side effects
- Mismatched types and values array lengths return an error
- Invalid Solidity type strings (e.g. typos like 'uint257') cause encoding failure
- Values incompatible with their declared types (e.g. passing a string for bytes32) may cause errors
- Network or payment processing failure results in no receipt returned
- Oversized or deeply nested inputs may time out
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "encode-packed",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.25,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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