Simulate one unsigned Base transaction before an agent signs it
Simulate one unsigned Base transaction before an agent signs it. Runs eth_call and gas estimation on current chain state, decodes the intent (ERC-20 transfer, approve, NFT setApprovalForAll), flags unlimited approvals, calldata sent to a non-contract, zero-address targets, reverts and destination risk labels such as phishing or sanctions. Returns ALLOW, WARN, BLOCK or INCOMPLETE with findings. No key or signed transaction is requested.
Not tested: has real-world effectsour last check, 2026-10-25
0 of 0checks answered this week
n/amedian answer time
$0.001listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://kushbitx.com/api/transaction-preflight
| Category | Company and compliance |
|---|---|
| Provider host | kushbitx.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 0 from 0 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"chain": "base",
"data": "0xa9059cbb000000000000000000000000d2db751a2fdba554706fb535438d81d3a0b4297900000000000000000000000000000000000000000000000000000000000003e8",
"from": "0x0d68028d06af13379C872FEE032568B4Be712f22",
"to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"valueWei": "0"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "http://json-schema.org/draft-07/schema#",
"properties": {
"input": {
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"chain": {
"enum": [
"base"
],
"type": "string"
},
"data": {
"description": "Unsigned calldata.",
"pattern": "^0x([a-fA-F0-9]{2})*$",
"type": "string"
},
"from": {
"description": "Optional sender used for simulation.",
"pattern": "^0x[a-fA-F0-9]{40}$",
"type": "string"
},
"to": {
"description": "Transaction destination.",
"pattern": "^0x[a-fA-F0-9]{40}$",
"type": "string"
},
"valueWei": {
"description": "Native ETH value in wei.",
"pattern": "^[0-9]+$",
"type": "string"
}
},
"required": [
"chain",
"to"
],
"type": "object"
},
"bodyType": {
"enum": [
"json"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"enum": [
"http"
],
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"chain": {
"const": "base",
"type": "string"
},
"destination": {
"properties": {
"address": {
"pattern": "^0x[a-fA-F0-9]{40}$",
"type": "string"
},
"balanceWei": {
"type": [
"string",
"null"
]
},
"bytecodeBytes": {
"type": "integer"
},
"externalRiskCheckAvailable": {
"type": "boolean"
},
"externalRiskSignals": {
"items": {
"type": "string"
},
"type": "array"
},
"type": {
"type": "string"
}
},
"type": "object"
},
"findings": {
"items": {
"properties": {
"category": {
"type": "string"
},
"code": {
"type": "string"
},
"points": {
"type": "number"
},
"reason": {
"type": "string"
},
"severity": {
"enum": [
"critical",
"high",
"medium",
"low",
"info"
],
"type": "string"
}
},
"required": [
"code",
"severity",
"reason"
],
"type": "object"
},
"type": "array"
},
"generatedAt": {
"format": "date-time",
"type": "string"
},
"intent": {
"properties": {
"amountAtomic": {
"type": "string"
},
"approved": {
"type": "boolean"
},
"operator": {
"pattern": "^0x[a-fA-F0-9]{40}$",
"type": "string"
},
"selector": {
"type": "string"
},
"spender": {
"pattern": "^0x[a-fA-F0-9]{40}$",
"type": "string"
},
"type": {
"enum": [
"native_transfer",
"contract_call",
"erc20_approve",
"nft_set_approval_for_all",
"erc20_transfer",
"erc20_transfer_from"
],
"type": "string"
},
"unlimitedApproval": {
"type": "boolean"
}
},
"required": [
"selector",
"type"
],
"type": "object"
},
"limitations": {
"items": {
"type": "string"
},
"type": "array"
},
"receipt": {
"description": "Added by the paid endpoint: saved report ID, amount, network and settlement transaction.",
"properties": {
"amountUsdc": {
"type": "string"
},
"createdAt": {
"format": "date-time",
"type": "string"
},
"expiresAt": {
"format": "date-time",
"type": "string"
},
"network": {
"const": "base",
"type": "string"
},
"reportId": {
"type": "string"
},
"service": {
"type": "string"
},
"transaction": {
"type": [
"string",