Coil solver

ELI5: Off-chain program that collects signed intents, finds a fair clearing price, and sends one transaction to Coil to settle the batch.

What you can do

Component	Role
coil-solver (Rust)	Match intents, compute clearing
coil-cli	Submit execute_batch
Whitelist	Only approved solver addresses

Users do not run the solver — you sign intents; solver operates infrastructure.

Flywheel fit

Solver includes CoilMakerStrategy EIP-1271 intents alongside user orders — proprietary flow + retail flow in same batch.

Architecture

From Coil-DEX/solver/README.md:

coil-types    — intent structs, EIP-712 helpers
coil-book     — order book / aggregation
coil-solver   — matching engine
coil-settle   — on-chain calldata builder
coil-cli      — operator CLI

Contract vector tests in repo validate solver output against Coil.vy.

flowchart TD
    API[Intent pool] --> Book[coil-book]
    Book --> Solver[coil-solver]
    Solver --> Settle[coil-settle]
    Settle --> Chain[Coil.execute_batch]

What can go wrong

Risks

• Solver trust — malicious solver could censor or reorder off-chain (not steal CDP collateral).
• Liveness — no solver → intents expire unfilled.
• Operator key compromise → bogus batches revert on-chain guards.

Deep dive: testing

mox test — 103 tests on-chain; solver has separate Rust tests + vector tests against Vyper.

Source: Coil-DEX/solver/README.md