# 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 support prediction markets?**
Yes — that is the flagship vertical: bring your own trade-scoped Polymarket
credential (verified live, sealed write-only), set hard risk rules
(per-market caps, daily loss stops, resolution-exposure limits) that are
enforced server-side against a ledger-derived exposure floor, and journal
fills into auditable books. Order transmission is dev-gated today;
pre-flight checks, credentials, onboarding, and fill
journaling are live.

**Do you ever hold funds or keys?**
Keys: no wallet key for the core treasury product — on-chain authority comes
from scoped, revocable session-key delegations enforced by the agent's own
ERC-4337 account, and Cofferline never holds your connected account's
owner key. Funds: it does not custody your wallet, but two things are held —
a **prepaid fee balance** is real USDC you transfer to the
platform treasury for service credit (platform-held), and the platform runs its
own **treasury/relay wallet** (its own funds). Then there are opt-in **venue
trade credentials**: a Polymarket signer is, by the venue's own design, the owner
key of your funder wallet — its orders-only use is enforced by our application
policy (audited per use, anomaly-alerted), not by cryptography. Credentials are sealed at rest, never
returned by any endpoint, zeroed on revocation, and rotatable
(`GET /v1/pm/credentials/{id}/rotation`); keep only working trading balances in
the funder and use a dedicated signer. The full breakdown of what is held on
every surface is the [authority & custody matrix](/docs/custody).

**What does it cost?**
Pricing is published machine-readably in the manifest — the same source
renders this site's pricing and the 402 payment requirements. Early-stage pricing: rates may change as the platform matures; the manifest is always the current truth.
Currently discovery, quotes, pre-flight checks, and reads are free, and
metered execution is payable in USDC via x402 or prepaid balance — no cards,
no invoices.

**Which chains?**
Base (8453) in production, Base Sepolia (84532) in the dev environment;
Polymarket surfaces read Polygon (137). Quotes run against Base mainnet
markets, where the venues actually operate.

**Where do the numbers come from?**
Quotes call live venue APIs on every request. Benchmarks publish only
measured aggregates from real completed intents with sample sizes attached;
an empty bucket reports n: 0.

**Where do the humans hang out?**
The [community Discord](https://discord.gg/He3GGJxSy) — questions, integration help, and
platform news. Security reports go to `security@cofferline.com`
(see `/.well-known/security.txt`).