Not a wallet, not a custodian, not a policy setting. An independent verifier that checks every payment against your rules and co-signs it, or the payment never exists.
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EXCHAIN_×_MASUMI
Guarded wallets for Masumi agents
Fund your Masumi agents from a guarded wallet. A runaway loop, a prompt injection, a hallucinated spending spree: each one stops at the rules you wrote.
WITH_EXCHAIN_YOU_CAN
Give agents a real budget
The downside is capped, so the budget can be real.
Take humans out of the loop
Every payment is checked in about a second. Nobody signs off by hand.
Put a number on the worst case
Hacked, tricked or buggy, the agent cannot lose more than you set.
Prove every decision
Every yes and every no, recorded in a log nobody can edit.
HOW_IT_WORKS
Write the rules once
Who gets paid, how much, how often. Signed with a cold key.
Rules
Max per payment
Max per day
Pay only
Signed with the cold keyLocked
We verify and sign
Inside the rules, Exchain co-signs. Outside them, no signature, so the payment never exists.
Every payment request, checked
Research agent $120Signed
Design agent $60Signed
Same seller, 41st time $199Not signed
No signature, no payment
Agent pays on its own
No human approves. Every payment needs two signatures: the agent’s and Exchain’s.
PROTECTED_BY_EXCHAIN