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Base Chain Call Simulator & Risk Analyzer
x402
Base Chain Call Simulator & Risk Analyzer is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).
Simulates and risk-analyzes one or more Ethereum/Base smart contract calls, returning gas estimates, transfer breakdowns, balance changes, and a SAFE/UNSAFE verdict before broadcasting.
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
Returns a JSON object with: overall success boolean, SAFE_TO_SEND/UNSAFE verdict, decoded function name, gas used and fee in ETH/USD, list of token transfers with amounts and symbols, per-address balance changes, any detected approvals, revert reason if failed, current block number, and suggested next endpoints.
Example use cases
Safe-send check for USDC transfer
“I'm about to send 50 USDC from my wallet 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 to 0xa587d73489f8f09d1975f1ddbb1c61c93e8fa9d7 on Base — simulate it and tell me if it's safe, what the gas cost will be in USD, and whether any unexpected approvals are triggered.”
DeFi multicall sequence dry-run
“Dry-run these three chained calls on Base for me — approve, swap, and deposit — encoded as a calls array, sender is 0xe4be4d0bd82d8e68203deff81f79ede0529f2617. Tell me if all three succeed, the total gas, and how my token balances change at each step.”
Unknown calldata decode and risk check
“Someone sent me this calldata to sign: 0x095ea7b3000000000000000000000000[redacted]ffffffff — can you simulate what it does on Base from my address 0xe4be4d0bd82d8e68203deff81f79ede0529f2617 and flag if it grants any dangerous approvals?”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/api/chain/call?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to pre-flight a Base chain transaction before broadcasting — especially to check safety, decode unknown calldata, preview balance changes, or detect malicious approvals. Prefer over generic gas estimators when you need decoded semantics (function name, token transfers, approval detection) rather than just a gas number. Ideal for onchain agents that must autonomously validate transactions before signing.
Side effects
- Invalid address format returns schema validation error
- Reverted simulation returns success:false with revert_reason populated
- Malformed calldata returns decode error
- Call array exceeding 5 items rejected
- Payment (x402 USDC) failure blocks the call
- Network congestion may cause stale block data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"from": "0xe4be4d0bd82d8e68203deff81f79ede0529f2617",
"next": [
"/crypto/base-gas",
"/crypto/tx-status?hash="
],
"block": 53272234,
"calls": [
{
"to": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"index": 0,
"success": true,
"function": "transfer(address,uint256)",
"gas_used": 45047,
"revert_reason": null
}
],
"chain": "base",
"flags": [],
"fee_eth": 5e-7,
"fee_usd": 0.0019,
"success": true,
"summary": "1 call succeeds; sender sends 0.001 USDC",
"verdict": "SAFE_TO_SEND",
"approvals": [],
"transfers": [
{
"to": "0xa587d73489f8f09d1975f1ddbb1c61c93e8fa9d7",
"from": "0xe4be4d0bd82d8e68203deff81f79ede0529f2617",
"token": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"amount": 0.001,
"symbol": "USDC"
}
],
"gas_used_total": 45047,
"sender_changes": {
"USDC": -0.001
},
"balance_changes": {
"0xa587d73489f8f09d1975f1ddbb1c61c93e8fa9d7": {
"USDC": 0.001
},
"0xe4be4d0bd82d8e68203deff81f79ede0529f2617": {
"USDC": -0.001
}
}
}
}Tags
x402
Reviews
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