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DeFi legos and protocol composability on Ethereum and L2s. Major protocols per chain — Aerodrome on Base, GMX/Pendle on Arbitrum, Velodrome on Optimism — plus mainnet primitives (Uniswap, Aave, Compound, Curve). How they work, how to build on them, and how to combine them.
Passed 20 of 22 test cases with the skill, and 16 of 22 without it.
and 3 more in the full report
4 fixed17 passed either way2 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 4 test cases the skill fixed. Same model, same prompt, with and without the skill.
Provide the verified smart contract addresses on Base L2 for the Aero Router and Aero Factory.
| Checked | Without skill | With skill |
|---|---|---|
| State the Aero Router address on Base as 0xcF77a3Ba9A5CA399B7c97c74d54e5b1Beb874E43 | Passed | Passed |
| State the Aero Factory address on Base as 0x420DD381b31aEf6683db6B902084cB0FFECe40Da | Missed | Passed |
The instructions your model reads when the skill loads.
DeFi TVL: Check DeFi Llama for current Ethereum DeFi TVL. If you're quoting numbers from 2023-2024, they're stale.
Uniswap V4 is live. Launched mainnet January 31, 2025 on 10+ chains. V4 introduced a hooks system — custom logic attached to pools (dynamic fees, TWAMM, limit orders, custom oracles). This is the biggest composability upgrade since flash loans. PoolManager addresses are different per chain (NOT deterministic like V3).
Costs changed everything: A flash loan arbitrage on mainnet costs ~$0.05-0.50 in gas now (was $5-50). This opens composability patterns that were previously uneconomical.
The dominant DEX on each L2 is NOT Uniswap. Aerodrome and Velodrome merged into Aero (November 2025, Dromos Labs) — the unified DEX dominates both Base and Optimism. Camelot is a major native DEX on Arbitrum. Don't default to Uniswap on every chain.
| Protocol | Contract | Mainnet Address |
|---|---|---|
| Uniswap V2 Router | Router | 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D |
| Uniswap V2 Factory | Factory | 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f |
| Uniswap V3 Factory | Factory | 0x1F98431c8aD98523631AE4a59f267346ea31F984 |
| Uniswap V3 SwapRouter02 | Router | 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45 |
| Uniswap V4 PoolManager | PoolManager | 0x000000000004444c5dc75cB358380D2e3dE08A90 |
| Uniswap Universal Router (V4) | Router | 0x66a9893cc07d91d95644aedd05d03f95e1dba8af |
| Aave V3 Pool | Pool | 0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2 |
See addresses/SKILL.md for complete multi-chain address list including L2-native protocols (Aerodrome, GMX, Pendle, Velodrome, Camelot, SyncSwap, Morpho).
Hooks let you add custom logic that runs before/after swaps, liquidity changes, and donations. This is the biggest composability upgrade since flash loans.
import {BaseHook} from "v4-periphery/src/utils/BaseHook.sol";
import {IPoolManager} from "v4-core/interfaces/IPoolManager.sol";
import {PoolKey} from "v4-core/types/PoolKey.sol";
import {BeforeSwapDelta, BeforeSwapDeltaLibrary} from "v4-core/types/BeforeSwapDelta.sol";
contract DynamicFeeHook is BaseHook {
constructor(IPoolManager _manager) BaseHook(_manager) {}
test cases passed, vs 16 / 22 without
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