> For the complete documentation index, see [llms.txt](https://docs.definitive.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.definitive.fi/developers/existing-client-api.md).

# Existing Client API

> 💡 **Looking for Flash API, our new Advanced Orders API? See Flash Docs** [**here**](https://flash.definitive.fi/docs) 

### <mark style="color:orange;">**Who is the Existing Client API For?**</mark>

Existing institutional and other clients of Definitive's trading platform can use this REST API to:

* Incorporate Definitive's trading capabilities into internal trading tools
* Access Post-Trade Reporting data directly via API
* Build internal products and tools leveraging existing Definitive trading vault wallet infra

### <mark style="color:orange;">**Welcome to Definitive's Existing Client API**</mark>

This API gives **existing clients** access to all of the **institutional-grade execution** and **automated post-trade analytics** found in your account on our advanced trading terminal.

This API lets you leverage our existing Definitive account to execute trades across 200+ liquidity venues, access advanced order types, and retrieve post-trade data — without the headache of building execution logic, routing algorithms, or parsing block explorer data yourself.

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### ⚙️ <mark style="color:orange;">Features</mark>

### **Deep Liquidity Aggregation**

When you place an order on Definitive we ensure institutional-grade, **multi-venue** execution by automatically routing orders across 100+ DEXs, PMMs, Liquidity Pools, Contracts, and Aggregators.

Our API provides instant quotes and breakdowns of execution venues for the fills involved.

### **Advanced Order Types**

Definitive supports onchain Market, Limit, TWAP, and Stop order types. Build advanced execution strategies through a unified, low-friction API.

### **Intent Masking**

Definitive is the only platform that offers onchain Market, Limit, TWAP, and Stop orders while keeping intent off-chain.

Unlike traditional protocols that expose strategy details onchain )risking frontrunning and MEV) Definitive separates order creation from execution. This architecture allows you to express complex trading logic without leaking sensitive intent to the network, preserving alpha and improving execution quality.

### **Gasless Execution**

With Definitive, users never worry about gas fees. By leveraging account-abstraction we are able to remove the friction of gas-sponsorship so you can focus fully on trading.

### **Post-Trade Reporting Analytics**

Every trade routed through Definitive returns:

* **Fill Time**
* **Fill Size**
* **Detailed Price Breakdown**
* **Execution Venues**
* **Fee Details**

Skip hours of parsing block explorers with Definitive’s automated post-trade data.

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### 💡 <mark style="color:orange;">Why Integrate Definitive?</mark>

* **Save Months of Dev Time**

  No need to build complex execution engines, slippage logic, or multi-chain liquidity routing from scratch.
* **Transparent Post-Trade Data**

  Instantly access trade fill data for compliance, reconciliation, or internal PnL dashboards.
* **Unified Access Across Chains**

  One integration unlocks **all major EVM chains + Solana**.
* **Built for AI Agents**

  Real-time trading APIs ready for integration with automated models and intelligent agents.
* **Battle-Tested Infra**

  Over $1.3B in notional volume executed on Definitive since March 2024 and [multiple security audits ](/what-is-definitive.md)from Tier 1 firms.
* **Chain-agnositc Execution**

  We're fully integrated across 10 chains (and more coming), seamlessly bridge and trade cross-chain.

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### 🔗 <mark style="color:orange;">Installation Developer Links</mark>

* [REST API Reference](https://ddp.definitive.fi/overview) (full API documentation)
* [Join Discord](https://discord.gg/definitive)