# TxGuard x402 Base API – Risk-Lite Pre-Signing Inspection

> TxGuard x402 Base API – Risk-Lite Pre-Signing Inspection is a paid API for AI agents from 50-7-41-26.sslip.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Performs fail-closed risk inspection on a transaction before signing, blocking high-risk transactions without ever signing, broadcasting, or bridging assets.

## Facts

- Endpoint: POST https://50-7-41-26.sslip.io/v1/risk-lite
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/txguard-x402-base-api-risk-lite-pre-signing-inspection-1a6c3486
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_blU2uXdCgfxVR1KHWHxst

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 txguard-x402-base-api-risk-lite-pre-signing-inspection-1a6c3486 -d '<json body>'
```

Example prompt: Before I sign this transaction, run a fail-closed risk inspection on it — check the contract address 0xAbC...123 on Base chain with this calldata and tell me if it's safe or should be blocked.

## When to prefer this

Choose this endpoint when you need a fast, lightweight, fail-closed risk gate before any transaction is signed by a wallet or agent — especially when operating on Base chain and paying per-call via x402. Prefer it over on-chain simulation tools when you want a security-first verdict without executing any code, and over general-purpose AML tools when the focus is pre-signing transaction safety rather than address-level compliance.

## Known failure modes

- Malformed transaction payload returns a 400 validation error
- Unsupported chain ID results in an error or unknown verdict
- Network timeout or service unavailability triggers fail-closed behavior (defaults to block)
- Missing required transaction fields cause inspection to fail with an error response
- Ambiguous or incomplete calldata may result in a low-confidence or inconclusive risk score

## How this service works

Fail-closed pre-signing risk inspection. This service never signs, broadcasts, or bridges assets.

## Output

Returns a risk verdict (block or allow) along with risk flags and scores identifying the nature and severity of detected threats in the inspected transaction. The service never modifies, signs, or broadcasts the transaction — it is a read-only, fail-closed inspection result.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/txguard-x402-base-api-risk-lite-pre-signing-inspection-1a6c3486/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 50-7-41-26.sslip.io](https://www.zero.xyz/host/50-7-41-26.sslip.io/llms.txt)