Ophis Docs

# 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, resolve_token, get_quote, build_order, submit_order, lookup_tier, list_chains, get_balances, get_portfolio, get_gas, get_token_chart, expected_surplus), 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 (0.01% on same-chain stablecoin pairs); SDK/MCP partner integrations charge a reduced 0.05% (5 bps). On the Ophis-operated chains (Optimism, Unichain) the flat Ophis fee is the all-in cost and 100% of any price improvement a solver wins beyond your signed quote stays with you. On CoW-hosted chains, CoW Protocol charges its own fees on top (0.02% volume fee, 0.003% correlated, plus 50% of quote improvement capped at 0.98% of volume), so the fixed all-in there is 0.12% / 0.013%. See [The all-in cost, per chain](https://docs.ophis.fi/fees#the-all-in-cost-per-chain). Worked examples: - Swap $10,000 USDC to ETH on Optimism (a volatile pair): fee is 0.10% = $10 all-in. On a CoW-hosted chain: 0.12% = $12 fixed all-in. 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 on Optimism/Unichain, 0.013% = $1.30 all-in on a CoW-hosted chain. 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 - Full docs as a single file (for LLM context windows): https://docs.ophis.fi/llms-full.txt - App: https://swap.ophis.fi - Source: https://github.com/ophis-fi/ophis