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ChainK9 Transaction Preview & Token Risk Check
x402
ChainK9 Transaction Preview & Token Risk Check is a paid API for AI agents from api.chaink9.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Simulates a blockchain transaction on a forked chain sandbox to detect honeypots, balance changes, and token risks before execution on BNB Smart Chain, Ethereum, or Base.
Price / call$0.02
Success—
StatusUnknown
How this service works
Token risk checks for BNB Smart Chain, Ethereum and Base, for AI agents and trading bots. ChainK9 forks the chain and really buys and sells a token in a sandbox before you do, so a honeypot is caught by what it does, not by what its code looks like.
Output
Returns a JSON object with: transaction status (succeeded/failed), balance changes for tracked native and ERC-20 assets (before/after/delta), gas used, any token approval data, fork execution metadata (elapsed time, RPC calls, fork transaction count), block number simulated, chain ID, coverage notes, and any limits applied (e.g. fork-only constraints).
Example use cases
Honeypot check before token purchase
“I'm about to ape into this new BSC token at 0x4B0F1812e5Df2A09796481Ff14017e6005508003 — can you fork the chain and actually try buying and selling it from my wallet 0xDeaDbeefdEAdbeefdEadbEEFdeadbeEFdEaDbeeF with calldata 0xa9059cbb and tell me if it's a honeypot or if I can get my BNB back out?”
DeFi swap simulation on Ethereum
“Before I submit this Uniswap swap on Ethereum, simulate it on a forked chain using my wallet 0xAbCdEf0123456789AbCdEf0123456789AbCdEf01, target contract 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D, calldata 0x38ed1739, and 0.5 ETH value — show me the expected balance changes for ETH and USDC.”
Trading bot pre-trade risk screen
“My trading bot is about to execute a buy on a Base token — run a transaction preview on Base for wallet 0x1111111111111111111111111111111111111111, target 0x2222222222222222222222222222222222222222, calldata 0x095ea7b3, tracking the tokens 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 — confirm the transaction will succeed and tell me the exact balance changes before we go live.”
Technical details
Endpoint
GEThttps://api.chaink9.com/transaction-preview?utm_source=zero.xyzWhen to prefer
Choose ChainK9 Transaction Preview when you need behavioral honeypot detection — not just static code analysis — because it actually executes a buy and sell in a sandboxed fork, catching honeypots that pass code-level audits. Prefer this over static analyzers like Token Sniffer or Go+ Security when you need ground-truth simulation of balance changes and sell-ability. Ideal for trading bots and AI agents that need a pre-flight check before committing funds on BSC, Ethereum, or Base.
Side effects
- Invalid wallet or contract address format returns a schema validation error
- Unsupported chain identifier returns an enum mismatch error
- Calldata that exceeds 16384 bytes is rejected
- Simulation may fail if the forked node cannot replicate mainnet state accurately at current block
- Token tracking list exceeding 10 addresses is rejected
- Network or RPC issues during fork simulation may cause timeouts
- x402 payment failure or insufficient USDC balance prevents the request from being processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"cost": {
"elapsed_ms": 1000,
"local_rpc_calls": 10,
"fork_transactions": 1
},
"data": {
"status": "succeeded",
"approval": null,
"coverage": "Only supplied assets inspected.",
"gas_used": 21000,
"balance_changes": [
{
"after": "99",
"asset": "BNB",
"delta": "-1",
"before": "100"
}
]
},
"tool": "transaction-preview",
"block": 1,
"limits": [
"Fork only."
],
"chain_id": 56
}
}Tags
x402
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