The Next Billion Onchain Traders Won’t Be Human

Introducing Flash API, we put a professional trading desk behind one API to power the agentic economy.

Soon, millions of AI agents will trade around the clock across every chain and every market. Wallets won't just hold tokens - they’ll proactively manage risk, execute strategies, and compound returns for users. Consumer apps will add trading features. Any builder, technical or not, will be able to ship a trading agent.

That future needs execution infrastructure that's powerful, resilient and agent-first.

Today, we're launching Definitive Flash API: one API integration that lets any builder, whether agentic or human, access the power of a professional trading desk.

• DCA. Limit. Stop Buy, Stop Loss. Take Profit. TWAP, Quick Trade Sniping, Bracket, and Market orders
• 900+ DEXs and unique onchain liquidity sources
• Multi-chain, EVM and Solana

Most onchain trading APIs on the market stop at simple swaps. But the next generation of products will need the full toolkit: comprehensive advanced order suite and reliable execution across every asset and chain.

Why Flash API

Building reliable trading infrastructure in-house means managing myriad nuances in onchain trading and chain-specific edge cases. For most teams, it’s months of engineering work before users ever place a single trade. Flash can handle all of it through a single, AI agent-friendly integration, giving builders three things that are difficult to build, maintain, and scale in-house.

1. Every major order type, out of the box

Most trading APIs give you only market swaps. Flash supports a suite of advanced order types through a single API integration:

• Market
• DCA
• Limit Buy/Sell
• Stop Buy
• Stop Loss
• Take Profit
• TWAP
• Quick Trade / Token Sniping
• Bracket Orders

That means your users can access the trading tools similar to a professional trading desk, directly inside your product.

2. Any token and tokenized RWA across EVM and Solana

Flash supports any ERC-20 or SPL token across 11 major EVM chains and Solana, including tokenized equities.

To power execution across long-tail tokens, majors, stablecoins, and RWAs, Flash aggregates liquidity from 900+ DEXs, onchain liquidity venues and professional market makers to find the most competitive routes at the moment of execution. For long-running order types like TWAP, routing adjusts dynamically to adapt to real-time liquidity and market conditions.

Your product does not need to integrate liquidity sources one by one. Flash handles aggregation, routing, and execution optimization across a comprehensive liquidity landscape to offer better execution prices.

3. Managed execution from intent to settlement

Advanced orders require sophisticated execution infrastructure. Flash handles the complexity behind landing each trade, including:

• Conditional order monitoring
• Gas estimation
• Nonce management
• MEV protection
• Slippage optimization
• Transaction simulation
• Route optimization
• Retry logic
• Real-time execution management
• Post-Trade Analytics

Your users specify what they want to trade, set their price, time, and slippage parameters, and sign. Flash handles the rest with its fully managed transaction landing service.

Order intents are held offchain for privacy until execution conditions are met. At the moment of fill, Flash dynamically routes across aggregated liquidity venues to help minimize slippage and optimize execution quality.

The Definitive Pedigree

Definitive was built by a team with deep experience in institutional digital asset trading infrastructure.

Our roots go back to Tagomi and Coinbase Prime, where Definitive's cofounders helped build trading systems used by some of the world's largest financial institutions. That DNA shaped Definitive from day one: execution quality, security, reliability, and scale.

Today, Definitive is trusted by 100K+ pro traders, leading funds, DAOs, and financial institutions. Definitive has processed $3B+ in notional spot volume and landed millions of transactions onchain.

Flash API opens up that same trade engine to every builder - the execution layer we built for institutions is now available through a single AI prompt.

Non-Custodial by Design. With Security at the Core

Flash is fully non-custodial, including for conditional order types like limit and stop-loss orders. User funds remain in user wallets until execution conditions are met.

Flash's smart contracts have been fully audited by a leading security firm with no major findings. Additionally, Definitive trade engine, which also powers Flash, has a multi-year track record and has been audited multiple times with no major findings. All audits can be reviewed on our Security page.

Teams Already Shipping with Flash

• Altcoinist uses Definitive to power 55K+ trades in its Telegram bot
• EmblemAI replaced 10 APIs with one Flash integration
• rb3k shipped a fully-featured trading app with zero coding experience
• Basemate turned iMessages into live trades with Flash

Definitive Is Powerful Execution Infrastructure for the Agentic Future

Definitive started as a trading platform for professional traders and institutions. Flash API is the natural evolution of everything we've been building since day one. At Coinbase, we built institutional trading systems used by some of the world's largest financial firms. We saw firsthand what reliable execution looked like when billions of dollars were moving through markets. Then, we brought that philosophy to DeFi with the Definitive trading terminal. Now we're seeing the next shift. Flash API is how professional-grade execution scales beyond Definitive's own products

Definitive is becoming the essential execution infrastructure layer for trading, whether the user on the other side is an AI agent running a TWAP strategy autonomously, a human placing a limit order from a wallet, or a non-technical founder shipping their first trading app with an AI coding assistant.

Start Building with Flash

Builders can access advanced onchain trading using a simple AI prompt with Flash. Integrate once. Support every major order type. Route across 200+ liquidity venues. Fully non-custodial. Monetize trading through customizable fees.

We built Flash with AI workflows in mind. The API is stateless, REST-based, and supported by LLM-optimized documentation, making it easy for AI coding agents to do the heavy lifting.

Flash API docs and guides are available here.

Start building today. And when you launch, let us know — we love to hear what builders are shipping and may even feature what you build to Definitive's audience of traders.