# Ophis Docs

> Developer documentation for Ophis: an intent-based, MEV-protected DEX aggregator (a CoW Protocol fork) built for the agent era. Describe a swap in natural language; a competitive solver auction fills it across the deepest on-chain liquidity, MEV-protected, settled in one batch. Agents integrate via a hosted MCP server or a single REST call.

## Build with Ophis

- [AI agent integration](https://docs.ophis.fi/ai-agents): hosted MCP server at https://mcp.ophis.fi/mcp (tools: parse_intent, get_quote, build_order, submit_order, lookup_tier, list_chains), plus Intent-API recipes for LangChain / AutoGPT / function-calling agents. The human always signs: the signature is the trust boundary.
- [Intent API](https://docs.ophis.fi/intent-api): `POST https://ophis.fi/api/intent` with `{"text": "swap 100 USDC for ETH on Base"}` returns `{ok, data: {intent, entities}}`. OpenAPI spec: https://ophis.fi/openapi.json

## Fees

Ophis charges a flat 0.10% (10 bps) fee on trade volume, applied to every trade. Same-chain stablecoin-to-stablecoin swaps pay a reduced 0.01% (1 bp). The fee is on volume, not surplus: 100% of any price improvement a solver wins beyond your signed quote stays with you. See [How it works](https://docs.ophis.fi/fees#how-it-works) and [Surplus stays with you](https://docs.ophis.fi/fees#surplus-stays-with-you).

Worked examples:
- Swap $10,000 USDC to ETH (a volatile pair): fee is 0.10% = $10. See [Volatile pair](https://docs.ophis.fi/fees#volatile-pair-eg-usdc-to-eth-010-flat).
- Swap $10,000 USDC to USDT on the same chain (a stablecoin pair): fee is 0.01% = $1. See [Same-chain stablecoin pair](https://docs.ophis.fi/fees#same-chain-stablecoin-pair-eg-usdc-to-usdt-001-flat).
- A large share of the fee comes back monthly in WETH rebates. See [Monthly WETH rebates](https://docs.ophis.fi/fees#what-you-get-back-monthly-weth-rebates).

## Reference

- [Introduction](https://docs.ophis.fi/)
- [Getting started](https://docs.ophis.fi/getting-started): the three-step flow, [Intent](https://docs.ophis.fi/getting-started#1--intent-parse-the-request), [Auction](https://docs.ophis.fi/getting-started#2--auction-solver-competition), [Settle](https://docs.ophis.fi/getting-started#3--settle-on-chain-mev-protected).
- [Architecture](https://docs.ophis.fi/architecture)
- [Fees & rebates](https://docs.ophis.fi/fees)
- [Audits](https://docs.ophis.fi/audits): non-custodial [Custody](https://docs.ophis.fi/audits#custody) and [MEV protection by construction](https://docs.ophis.fi/audits#mev-protection-by-construction).
- [Status](https://docs.ophis.fi/status)
- [FAQ](https://docs.ophis.fi/faq)

## More

- App: https://swap.ophis.fi
- Source: https://github.com/ophis-fi/ophis