# 100BTC Preflight Transaction Safety Check

> 100BTC Preflight Transaction Safety Check is a paid API for AI agents from vps-fc89c157-1.taila28d02.ts.net:10000, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Simulates and analyzes an EVM transaction before execution to detect malicious proxy patterns, unlimited allowances, and estimate gas costs

## Facts

- Endpoint: POST https://vps-fc89c157-1.taila28d02.ts.net:10000/api/preflight?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/100btc-preflight-transaction-safety-check-20e3e12e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cedQqrzLe0kWl7mYDHXvU

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability 100btc-preflight-transaction-safety-check-20e3e12e -d '<json body>'
```

Example prompt: Before I sign this transaction, can you run a preflight safety check on it? The calldata is 0xa9059cbb000000000000000000000000abcdef1234567890abcdef1234567890abcdef12, sending from 0x1234567890abcdef1234567890abcdef12345678 to 0xabcdef1234567890abcdef1234567890abcdef12 on chain 1 — I want to know if there are any malicious proxy patterns or unlimited allowances, the risk score, and the estimated gas.

## When to prefer this

Choose this endpoint when you need a fast, cheap ($0.01 USDC) pre-execution safety check on an EVM transaction — especially useful before signing approve() calls, interacting with unknown contracts, or when an AI agent needs automated go/no-go decisions. Prefer this over manual inspection when you need automated detection of malicious proxy patterns and unlimited allowance risks with gas estimation in a single call.

## Known failure modes

- Invalid Ethereum address format returns validation error
- Unsupported chain_id results in simulation failure
- Malformed calldata causes simulation to fail with error
- Network unreachable on target RPC results in timeout
- Missing required fields returns 400 bad request

## How this service works

Thirty x402 v2 pay-per-call APIs by 100BTC. Listing data is generated from each live HTTP 402 challenge and runtime Bazaar schema.

## Output

Returns a JSON object with a decision field (ALLOW or DENY), a numeric risk_score (0 = no risk), an array of human-readable reasons explaining the assessment, a simulation object indicating whether the transaction simulation succeeded, and an estimated_gas value for the transaction.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "string"
  },
  "value": {
   "type": "string"
  },
  "chain_id": {
   "type": "integer"
  },
  "to_address": {
   "type": "string",
   "pattern": "^0x[a-fA-F0-9]{40}$"
  },
  "from_address": {
   "type": "string",
   "pattern": "^0x[a-fA-F0-9]{40}$"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "reasons": [
   "Simulation passed, no malicious proxy patterns or unlimited allowance detected."
  ],
  "decision": "ALLOW",
  "risk_score": 0,
  "simulation": {
   "success": true
  },
  "estimated_gas": 31535
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/100btc-preflight-transaction-safety-check-20e3e12e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vps-fc89c157-1.taila28d02.ts.net:10000](https://www.zero.xyz/host/vps-fc89c157-1.taila28d02.ts.net%3A10000/llms.txt)