Tool detail
TxGuard
Explains and preflights an unsigned Base transaction, EIP-712 typed data or an x402 payment authorization before signing, checking it against a claimed quote.
Categories: Crypto risk, Onchain data
Use when
- check what an unsigned Base transaction actually does before signing
- verify an x402 payment authorization matches its quoted recipient, amount and asset
- decode an EIP-3009 authorization or EIP-712 typed-data payload before approving it
Not for
- not a signer or wallet — never submits or signs anything itself
- not a safety or profitability guarantee; returns 'unknown' on ambiguous selectors
Inputs
POST JSON body: exactly one of unsigned_tx, tx_hash, typed_data or authorization (EIP-3009); optional expected_quote, simulate (boolean, default false).
Inputs undocumented: unsupported schema construct: oneOf
Endpoint
- Method
POST- URL
https://txguard.schemasure.com/v1/tx/preflight
Payment
- Protocol
- x402
- Listed price
- 0.01 USDC per call on Base (0.015 if simulate=true, per docs)
- Payment method
- exact
- Network
- eip155:8453
- Asset
- 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.
Source
- Directory
- Coinbase x402 Bazaar
- Record
- POST https://txguard.schemasure.com/v1/tx/preflight
- Retrieved
- 2026-09-30T20:37:07.382Z
- Catalog file SHA-256
6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524- Catalog built
- 2026-09-30T22:31:58.034Z