Tool detail
presign-guard
Returns a green/orange/red pre-sign verdict for an EVM transaction, approval or signature, screening for sanctions and scam spenders.
Categories: Crypto risk
Use when
- check if a transaction is safe before an agent signs it
- screen a token approval spender for sanctions or scams
- verify a Permit, Permit2 or Seaport signature before signing
Not for
- not a block explorer - safety verdict only, not full transaction details
- not post-send monitoring - pre-sign check only
Inputs
POST JSON body: type (enum approval|transaction|signature, required); chainId (enum 1,10,56,137,8453,42161, required); plus type-specific fields (spender/token/amount, to/data/value, or typedData)
Inputs undocumented: type union outside Onelayer's profile
Endpoint
- Method
POST- URL
https://presign-guard.onrender.com/v1/check
Payment
- Protocol
- x402
- Listed price
- 0.01 USDC per call on Base
- 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://presign-guard.onrender.com/v1/check
- Retrieved
- 2026-09-30T20:37:07.382Z
- Catalog file SHA-256
6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524- Catalog built
- 2026-09-30T22:31:58.034Z