feat: add MegaETH across all relevant skills

SKILL.md

@@ -46,9 +46,10 @@ Creating wallets, key safety, multisig, account abstraction.
 ### [Layer 2s](https://ethskills.com/l2s/SKILL.md)
 L2 landscape, bridging, deployment differences.
 - Base is the cheapest major L2. Arbitrum has the deepest DeFi liquidity.
+- MegaETH produces 10ms mini blocks — 100x faster than any other L2. Real-time onchain apps.
 - Celo is NOT an L1 anymore — migrated to OP Stack L2 in March 2025.
 - Polygon zkEVM is being shut down. Do not build on it.
-- The dominant DEX on each L2 is NOT Uniswap (Aerodrome on Base, Velodrome on Optimism).
+- The dominant DEX on each L2 is NOT Uniswap (Aerodrome on Base, Velodrome on Optimism, Kumbaya on MegaETH).
 
 ### [Standards](https://ethskills.com/standards/SKILL.md)
 ERC-20, ERC-721, ERC-8004, EIP-7702, x402.
@@ -148,4 +149,5 @@ Pre-ship audit checklist for a reviewer agent.
 | Auditing a smart contract | `audit/` |
 | Monitoring / analytics | `indexing/` |
 | Building AI agent infra | `standards/`, `wallets/`, `tools/` |
+| Real-time / low-latency apps | `l2s/`, `gas/`, `addresses/` |
 | Choosing a chain | `l2s/`, `gas/` |

addresses/SKILL.md

@@ -30,6 +30,7 @@ description: Verified contract addresses for major Ethereum protocols across mai
 | Arbitrum | `0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9` | ✅ Verified |
 | Optimism | `0x94b008aA00579c1307B0EF2c499aD98a8ce58e58` | ✅ Verified |
 | Base | `0xfde4C96c8593536E31F229EA8f37b2ADa2699bb2` | ✅ Verified |
+| MegaETH | `0xB8CE59FC3717ada4C02eaDF9682A9e934F625ebb` | ✅ Verified |
 
 ### DAI (MakerDAO)
 | Network | Address | Status |
@@ -49,6 +50,7 @@ description: Verified contract addresses for major Ethereum protocols across mai
 | Arbitrum | `0x82aF49447D8a07e3bd95BD0d56f35241523fBab1` | ✅ Verified |
 | Optimism | `0x4200000000000000000000000000000000000006` | ✅ Verified |
 | Base | `0x4200000000000000000000000000000000000006` | ✅ Verified |
+| MegaETH | `0x4200000000000000000000000000000000000006` | ✅ Verified |
 
 ---
 
@@ -61,6 +63,7 @@ description: Verified contract addresses for major Ethereum protocols across mai
 | Arbitrum | `0x5979D7b546E38E414F7E9822514be443A4800529` | ✅ Verified |
 | Optimism | `0x1F32b1c2345538c0c6f582fCB022739c4A194Ebb` | ✅ Verified |
 | Base | `0xc1CBa3fCea344f92D9239c08C0568f6F2F0ee452` | ✅ Verified |
+| MegaETH | `0x601aC63637933D88285A025C685AC4e9a92a98dA` | ✅ Verified |
 
 ### Lido — Staking & Withdrawal
 | Contract | Address | Status |
@@ -457,6 +460,18 @@ The leading native DEX on zkSync Era. Multiple router and factory versions.
 
 Source: [docs.syncswap.xyz](https://docs.syncswap.xyz/syncswap/smart-contracts/smart-contracts)
 
+### Kumbaya (MegaETH) — Dominant DEX
+
+The most liquid DEX on MegaETH with an integrated launchpad. Sub-cent swap costs with 10ms mini block latency.
+
+| Contract | Address | Status |
+|----------|---------|--------|
+| SwapRouter02 | `0xE5BbEF8De2DB447a7432A47EBa58924d94eE470e` | ✅ Verified |
+| QuoterV2 | `0x1F1a8dC7E138C34b503Ca080962aC10B75384a27` | ✅ Verified |
+| UniversalRouter | `0xAAB1C664CeaD881AfBB58555e6A3a79523D3e4C0` | ✅ Verified |
+
+Pool init code hash: `0x851d77a45b8b9a205fb9f44cb829cceba85282714d2603d601840640628a3da7`
+
 ### Morpho Blue (Base)
 
 Permissionless lending protocol. Deployed on Base and Ethereum, but **NOT on Arbitrum** as of February 2026 (despite the vanity CREATE2 address).

building-blocks/SKILL.md

@@ -226,7 +226,59 @@ Pendle splits yield-bearing assets into principal and yield components:
 - **Stylus:** Write smart contracts in Rust/C++/WASM alongside EVM (10-100x gas savings for compute-heavy operations)
 - **Orbit:** Launch custom L3 chains (47 live on mainnet)
 
-See `addresses/SKILL.md` for all verified protocol addresses (GMX, Pendle, Camelot, Aerodrome, Velodrome, SyncSwap, Morpho).
+See `addresses/SKILL.md` for all verified protocol addresses (GMX, Pendle, Camelot, Aerodrome, Velodrome, SyncSwap, Kumbaya, Morpho).
+
+### MegaETH DeFi
+- **Dominant DEX: Kumbaya** — most liquid DEX on MegaETH with an integrated launchpad. SwapRouter02: `0xE5BbEF8De2DB447a7432A47EBa58924d94eE470e`.
+- **10ms mini blocks** enable real-time order book DEXes and HFT strategies that aren't viable on other L2s.
+- **Sub-cent swap costs** — base fee is fixed at 0.001 gwei.
+
+### MegaETH-Specific Patterns
+
+MegaETH's 10ms mini blocks and multidimensional gas model require different patterns than other L2s.
+
+**Instant receipts — skip polling:**
+```javascript
+// eth_sendRawTransactionSync (EIP-7966) returns receipt in <10ms
+// No need for eth_getTransactionReceipt polling loops
+const receipt = await client.request({
+  method: 'realtime_sendRawTransaction',
+  params: [signedTx]
+});
+// receipt is already confirmed — no waiting
+```
+
+**WebSocket mini block streaming:**
+```javascript
+// Subscribe to mini blocks for real-time event processing
+// 100 mini blocks per EVM block — 10ms granularity
+const ws = new WebSocket('wss://mainnet.megaeth.com/ws');
+ws.send(JSON.stringify({
+  jsonrpc: '2.0', method: 'eth_subscribe',
+  params: ['miniBlocks'], id: 1
+}));
+// CRITICAL: send eth_chainId keepalive every 30 seconds
+```
+
+**Gas patterns:**
+- Base fee is fixed at 0.001 gwei — no EIP-1559 spikes. Skip `eth_maxPriorityFeePerGas` (returns 0).
+- Hardcode gas limits when possible to save an `eth_estimateGas` round-trip.
+- But always use remote `eth_estimateGas` for new contracts — MegaEVM gas costs differ from standard EVM (multidimensional: compute gas + storage gas).
+- SSTORE 0→non-zero is expensive (2M gas × multiplier). Design for storage slot reuse, not constant allocation.
+
+**Storage optimization:**
+- Max contract size is **512 KB** (vs 24 KB on Ethereum) — room for larger contracts.
+- Use Solady's `RedBlackTreeLib` instead of Solidity mappings for slot reuse.
+- Transient storage (`TSTORE`/`TLOAD`) is available and cheap.
+
+**Multicall batching:**
+- Use `Multicall3.aggregate3()` to batch read calls — 4-5x faster than sequential `eth_call`.
+- Multicall3 is at the standard address: `0xcA11bde05977b3631167028862bE2a173976CA11`.
+
+**Debugging:**
+- [mega-evme](https://github.com/megaeth-labs/mega-evm) — replay transactions with full traces, profile gas by opcode.
+
+**Deep dive:** For comprehensive MegaETH development patterns (Foundry config, Privy headless signing, ERC-7710 delegations, MegaNames, USDm, and more), see the [awesome-megaeth-ai](https://github.com/0xBreadguy/awesome-megaeth-ai) repo and the [MegaETH developer skill](https://github.com/0xBreadguy/megaeth-ai-developer-skills).
 
 ## Discovery Resources
 

gas/SKILL.md

@@ -30,13 +30,13 @@ description: Current Ethereum gas prices, transaction costs, and the real econom
 
 ## Mainnet vs L2 Costs (Early 2026)
 
-| Action | Mainnet (0.1 gwei) | Arbitrum | Base | zkSync | Scroll |
-|--------|---------------------|----------|------|--------|--------|
-| ETH transfer | $0.004 | $0.0003 | $0.0003 | $0.0005 | $0.0004 |
-| ERC-20 transfer | $0.013 | $0.001 | $0.001 | $0.002 | $0.001 |
-| Swap | $0.036 | $0.003 | $0.002 | $0.005 | $0.004 |
-| NFT mint | $0.030 | $0.002 | $0.002 | $0.004 | $0.003 |
-| ERC-20 deploy | $0.240 | $0.020 | $0.018 | $0.040 | $0.030 |
+| Action | Mainnet (0.1 gwei) | Arbitrum | Base | MegaETH | zkSync | Scroll |
+|--------|---------------------|----------|------|---------|--------|--------|
+| ETH transfer | $0.004 | $0.0003 | $0.0003 | $0.0001 | $0.0005 | $0.0004 |
+| ERC-20 transfer | $0.013 | $0.001 | $0.001 | $0.001 | $0.002 | $0.001 |
+| Swap | $0.036 | $0.003 | $0.002 | $0.001 | $0.005 | $0.004 |
+| NFT mint | $0.030 | $0.002 | $0.002 | $0.001 | $0.004 | $0.003 |
+| ERC-20 deploy | $0.240 | $0.020 | $0.018 | $0.01 | $0.040 | $0.030 |
 
 **Key insight:** Mainnet is now cheap enough for most use cases. L2s are 5-10x cheaper still.
 

l2s/SKILL.md

@@ -35,6 +35,7 @@ description: Ethereum Layer 2 landscape — Arbitrum, Optimism, Base, zkSync, Sc
 | **Linea** | ZK | $0.003-0.006 | 2s | 30-60min | 59144 |
 | **zkSync Era** | ZK | $0.003-0.008 | 1s | 15-60min | 324 |
 | **Scroll** | ZK | $0.002-0.005 | 3s | 30-120min | 534352 |
+| **MegaETH** | Optimistic (EigenDA) | $0.001 | 10ms (mini) / 1s (EVM) | 7 days | 4326 |
 | ~~Polygon zkEVM~~ | ~~ZK~~ | — | — | — | ~~1101~~ |
 
 ⚠️ **Polygon zkEVM is being discontinued (announced June 2025).** Do not start new projects there. Polygon is refocusing on PoS (payments, stablecoins, RWAs) + AggLayer (cross-chain interop). MATIC → POL token migration ~85% complete.
@@ -70,6 +71,7 @@ description: Ethereum Layer 2 landscape — Arbitrum, Optimism, Base, zkSync, Sc
 | Maximum EVM compatibility | **Scroll or Arbitrum** | Bytecode-identical |
 | Mobile / real-world payments | **Celo** | MiniPay, sub-cent fees, Africa/LatAm focus |
 | MEV protection | **Unichain** | TEE-based priority ordering, private mempool |
+| Real-time apps / HFT / gaming | **MegaETH** | 10ms mini blocks, 10B gas/block, real-time streaming API |
 | Rust smart contracts | **Arbitrum** | Stylus (WASM VM alongside EVM, 10-100x gas savings) |
 | Stablecoins / payments / RWA | **Polygon PoS** | $500M+ monthly payment volume, 410M+ wallets |
 
@@ -84,6 +86,17 @@ description: Ethereum Layer 2 landscape — Arbitrum, Optimism, Base, zkSync, Sc
   - Do NOT use gas-price bidding strategies on Unichain — they're pointless
 - **Flashblocks:** Currently 1s blocks, roadmap to 250ms sub-blocks
 
+### MegaETH
+- **Launched:** March 2025. Chain ID 4326.
+- **Type:** Real-time L2 with EigenDA for data availability.
+- **Key innovation: 10ms mini blocks.** MegaETH produces mini blocks every ~10ms and standard EVM blocks every ~1s. The fastest block production of any L2, enabling real-time onchain applications (order books, games, streaming).
+- **Realtime API:** Custom JSON-RPC extensions beyond standard Ethereum. `realtime_sendRawTransaction` returns receipts instantly. WebSocket subscriptions for mini blocks enable sub-second event streaming.
+- **Capacity:** 10 billion gas per EVM block (vs Ethereum's 60M). Max contract size 512 KB (vs Ethereum's 24 KB).
+- **MegaEVM differences:** Multidimensional gas model (compute gas + storage gas). Base intrinsic gas is 60,000 (not 21,000). Base fee is 0.001 gwei (effectively fixed — EIP-1559 adjustment is disabled).
+- **EIP-7702:** Live on MegaETH.
+- **Primary DEX:** Kumbaya — most liquid DEX on MegaETH with an integrated launchpad.
+- **Testnet:** Chain ID 6343, RPC `https://carrot.megaeth.com/rpc`, faucet at https://megaeth.com/faucet.
+
 ### Celo
 - **Was:** Independent L1 blockchain (2020-2025)
 - **Now:** OP Stack L2 on Ethereum — **migrated March 26, 2025** (block 31056500)
@@ -117,6 +130,18 @@ Members contribute **15% of sequencer revenue** to the Optimism Collective. Cros
 - Arbitrum's `block.number` returns L1 block number, not L2.
 - **Unichain:** Transactions are priority-ordered by time, not gas. Don't waste gas on priority fees.
 
+### MegaETH
+✅ EVM-compatible — standard Solidity contracts deploy without changes.
+
+**Gotchas:**
+- **Multidimensional gas:** Transactions consume both compute gas and storage gas. Base intrinsic gas is 60,000 (not 21,000). Gas estimation tools may underestimate.
+- **Base fee is 0.001 gwei** — effectively fixed, EIP-1559 adjustment is disabled. Don't hardcode gas assumptions from other chains.
+- **Max contract size is 512 KB** (vs 24 KB on Ethereum) — large contracts that don't fit on mainnet can deploy here.
+- **Mini blocks (10ms):** Use the Realtime API (`realtime_sendRawTransaction`, WebSocket mini block subscriptions) to take advantage of sub-second latency. Standard `eth_*` RPCs work normally but don't expose mini block granularity.
+- **`SELFDESTRUCT` is disabled** (not just deprecated like on Ethereum).
+
+For Foundry configuration, MegaEVM-specific testing patterns, and comprehensive development guides, see the [MegaETH developer skill](https://github.com/0xBreadguy/megaeth-ai-developer-skills) and [awesome-megaeth-ai](https://github.com/0xBreadguy/awesome-megaeth-ai).
+
 ### ZK Rollups
 - **zkSync Era:** Must use `zksolc` compiler. No `EXTCODECOPY` (compile-time error). 65K instruction limit. Non-inlinable libraries must be pre-deployed. Native account abstraction (all accounts are smart contracts).
 - **Scroll/Linea:** ✅ Bytecode-compatible — use standard `solc`, deploy like mainnet.
@@ -134,6 +159,7 @@ Members contribute **15% of sequencer revenue** to the Optimism Collective. Cros
 | Optimism | `https://mainnet.optimism.io` | https://optimistic.etherscan.io |
 | Unichain | `https://mainnet.unichain.org` | https://uniscan.xyz |
 | Celo | `https://forno.celo.org` | https://celoscan.io |
+| MegaETH | `https://mainnet.megaeth.com/rpc` | https://mega.etherscan.io |
 | zkSync | `https://mainnet.era.zksync.io` | https://explorer.zksync.io |
 | Scroll | `https://rpc.scroll.io` | https://scrollscan.com |
 | Linea | `https://rpc.linea.build` | https://lineascan.build |
@@ -181,6 +207,7 @@ forge create src/MyContract.sol:MyContract \
 | Base | Sepolia | 84532 | https://faucet.quicknode.com/base/sepolia |
 | Optimism | Sepolia | 11155420 | https://faucet.optimism.io |
 | Unichain | Sepolia | 1301 | https://faucet.unichain.org |
+| MegaETH | Testnet | 6343 | https://megaeth.com/faucet |
 
 ## Further Reading
 
@@ -191,6 +218,7 @@ forge create src/MyContract.sol:MyContract \
 - **Optimism:** https://docs.optimism.io
 - **Unichain:** https://docs.unichain.org
 - **Celo:** https://docs.celo.org
+- **MegaETH:** https://docs.megaeth.com
 - **zkSync:** https://docs.zksync.io
 - **Scroll:** https://docs.scroll.io
 - **Polygon:** https://docs.polygon.technology

ship/SKILL.md

@@ -84,6 +84,7 @@ If "what if nobody calls it?" breaks your system, you have a design problem. Fix
 | **Base** | Coinbase distribution, smart wallets, account abstraction | Consumer apps, social, onboarding non-crypto users, high-frequency micro-payments |
 | **Arbitrum** | Deepest L2 DeFi liquidity, Stylus (Rust contracts) | DeFi protocols that need to compose with existing Arbitrum liquidity |
 | **Optimism** | RetroPGF, Superchain ecosystem | Public goods, OP Stack ecosystem plays |
+| **MegaETH** | 10ms mini blocks, 10B gas/block, real-time streaming | Real-time apps, order books, games, HFT, anything needing sub-second latency |
 | **zkSync / Scroll** | ZK proofs, native account abstraction | Privacy features, ZK-native applications |
 
 **Don't pick an L2 because "mainnet is expensive." Pick an L2 because its superpower fits your app.**