# FAQ

**Is Cofferline an exchange or a wallet?**
Neither. It is the policy and orchestration layer on top of the agent's own
smart account, driving existing execution venues (CoW Protocol, ParaSwap;
more behind the same interface).

**Do you ever hold funds or keys?**
No. No code path stores or receives a user private key; on-chain authority
will come from scoped, revocable session-key delegations enforced by the
agent's own ERC-4337 account.

**What does it cost?**
Discovery, quotes, pre-flight checks, and reads are free. Metered execution
is priced in the manifest (the same source renders this site's pricing) and
is payable in USDC via x402 — no cards, no invoices.

**Which chains?**
Base (8453) in production, Base Sepolia (84532) in the dev environment.
Quotes run against Base mainnet markets, where the venues actually operate.

**How do I trust your numbers?**
Quotes call live venue APIs on every request. Benchmarks (when they ship)
publish only measured aggregates from real completed intents with sample
sizes attached — an empty bucket reports n: 0, never an invented number.