Pay-per-call smart-contract security: scans, tx simulation, and token risk via x402 (USDC on Base).
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Scan Solidity source and return a security verdict. This is a paid call ($0.01 USDC on Base mainnet) that flows through x402; in dev mode (DEV_MODE=1) no payment is required.
This tool isn't marked read-only, so it may change something on the server or in an account you connected.
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
Run in a terminal
claude mcp add --transport http preflight https://preflight--preflight-api-mcp.modal.run/mcp
Scan Solidity source and return a security verdict. This is a paid call ($0.01 USDC on Base mainnet) that flows through x402; in dev mode (DEV_MODE=1) no payment is required.
| Argument | Type | Description |
|---|---|---|
| source* | string | |
| contract_name | any |
{
"type": "object",
"title": "preflight_checkArguments",
"required": [
"source"
],
"properties": {
"source": {
"type": "string",
"title": "Source"
},
"contract_name": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Contract Name",
"default": null
}
}
}Return the Preflight service info and price list (free).
No arguments.
{
"type": "object",
"title": "preflight_pricingArguments",
"properties": {}
}Simulate a transaction against a contract and return revert reason, gas used, balance deltas, and severity-scored findings. mode='quick' costs $0.05 (eth_call); mode='deep' costs $0.25 (anvil local fork with gas, balance_delta_wei, and internal_calls). Paid in USDC on Base mainnet via x402; DEV_MODE=1 skips payment.
| Argument | Type | Description |
|---|---|---|
| to* | string | |
| data | any | |
| mode | string | |
| value_wei | any |
{
"type": "object",
"title": "preflight_simArguments",
"required": [
"to"
],
"properties": {
"to": {
"type": "string",
"title": "To"
},
"data": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Data",
"default": null
},
"mode": {
"type": "string",
"title": "Mode",
"default": "quick"
},
"value_wei": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
],
"title": "Value Wei",
"default": null
}
}
}Check a token contract before trading it. Returns a honeypot transfer verdict, transfer tax percentage, and owner privileges as a severity-scored ScanReport. Paid call ($0.05 USDC on Base mainnet) via x402; DEV_MODE=1 skips payment.
| Argument | Type | Description |
|---|---|---|
| address* | string |
{
"type": "object",
"title": "preflight_token_riskArguments",
"required": [
"address"
],
"properties": {
"address": {
"type": "string",
"title": "Address"
}
}
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 13, 2026.
No readOnlyHint / destructiveHint annotations, so clients can't tell a read from a write without asking.
Fix: Add annotations to each tool, e.g. { readOnlyHint: true } for tools that only read.