Alchemy vs ChainPending
Both platforms provide blockchain infrastructure, but they serve different purposes. Here's how they compare for pending transaction access.
The Key Difference
ChainPending delivers pre-simulated transactions. You receive pending transactions with event logs already included — no need to run your own simulation. With Alchemy, you'd need to simulate each transaction yourself using their Simulation API.
| Feature | Alchemy | ChainPending |
|---|---|---|
| Pending Transaction Access | Via Mempool API (separate product) | Core feature |
| Pre-Simulated Event Logs | Not included | Included with every TX |
| Simulation Required | Yes, via separate API calls | No, already done |
| WebSocket Streaming | Yes | Yes |
| Ethereum Support | Yes | Yes |
| BNB Chain Support | Yes | Yes (350ms delay on Pro) |
| Base (Flashblocks) | Standard node access | Real-time (all tiers) |
| Primary Use Case | General blockchain infrastructure | MEV, arbitrage, DeFi monitoring |
| Pricing Model | Compute units + add-ons | Simple subscription tiers |
What is Alchemy?
Alchemy is a comprehensive blockchain development platform that provides node infrastructure, APIs, and developer tools. They offer a wide range of services including standard RPC endpoints, enhanced APIs, NFT APIs, and their Mempool API for pending transaction access.
While Alchemy is excellent for general blockchain development, accessing simulated pending transactions requires combining multiple products: their Mempool API for raw pending transactions, plus their Simulation API to get event logs — each billed separately.
What is ChainPending?
ChainPending is purpose-built for one thing: delivering pending transactions with simulated event logs in real-time. We handle the complex simulation infrastructure so you don't have to.
Every transaction you receive includes the simulated logs showing what events would be emitted — token transfers, swaps, liquidity changes, and more. This makes it ideal for MEV strategies, arbitrage detection, and DeFi monitoring where knowing the transaction outcome before confirmation is critical.
When to Use Each
Choose Alchemy if:
- •You need general blockchain infrastructure
- •You're building dApps that need RPC endpoints
- •You need NFT-specific APIs
- •You want to manage simulation yourself
Choose ChainPending if:
- ✓You need pre-simulated pending transactions
- ✓You're building MEV or arbitrage bots
- ✓You want event logs without extra API calls
- ✓You need simple, predictable pricing
Ready to Get Pre-Simulated Transactions?
Stop paying for separate simulation API calls. Get pending transactions with event logs included from the start.