CofferlineCofferline
The treasury + risk layer for prediction-market agents. Trading on Polymarket? Bring your own trade-scoped credentials (sealed write-only), set hard risk policies — per-market caps, daily loss stops — enforced server-side from your real books, and journal every fill into double-entry books. One API.
Authentication is SIWE — Sign-In-With-Ethereum. The agent signs a challenge with its wallet and gets a session. There is no account to create, no email, and no personal data: access to a wallet is the whole of what an agent needs to use the service on its own.
And for any autonomous agent: treasury infrastructure that keeps a machine wallet funded, gassed, converted, controlled, and accounted for — non-custodially, entirely via API. No CAPTCHA. No human required.
Why we exist. We believe the internet's next form is agent-native: sites and services built to be discovered, evaluated, and operated by software — humans providing intent, agents orchestrating everything else autonomously. Cofferline is that thesis applied to money: the treasury a machine can run by itself, under rules a human sets once.
llms.txt · Agent manifest · Agent quickstart · Docs · OpenAPI · Explained for humans · Community Discord
5 WETH → USDC on Base, quoted live from venue APIs.
The slicing line is the same planner that executes intents, run against those quotes — including when it says slicing would not help. Slicing pays on size; at this size it often does not.
The manifest's capabilities array is the source of truth for what is live today vs roadmap.
Identity is the wallet: SIWE challenge → signature (EOA, EIP-1271, ERC-6492) → session → scoped API keys. The OpenAPI document is generated from the same schemas that validate requests. Metered surfaces settle in USDC via x402 or prepaid balance — no cards, no invoices.
Cofferline is non-custodial of your wallet and its keys: it never holds the owner key of, or takes custody of, your connected smart account, and executes only within a scoped, revocable on-chain session-key delegation — revocation works directly on-chain and never requires Cofferline's cooperation. Some modes are enumerated exceptions where the platform does hold funds or authority (prepaid fee balances; optional venue trade credentials). The full authority & custody matrix states what the platform holds on every surface and how you revoke it; it is also machine-readable at /legal/custody.json. Terms are hash-referenced in the manifest.
Early-stage pricing: rates may change as the platform matures; the manifest is always the current truth. These are the current published rates, rendered from the same source as the machine-readable manifest and 402 responses.