A Uniswap v4 hook: ## Job Order — Data Logger Hook (v0)

Chain: Robinhood Chain mainnet

RPC: https://rpc.mainnet.chain.robinhood.com

Paid by: 0x735121A546092F31050A867FD7E3A750C7B0EFF9

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Pre-Flight (Green/Red)

Confirm before building. If any fail → Red, report which step, stop. No charge.

1. Deploy a minimal afterSwap hook to Robinhood Chain mainnet
2. Initialize a SIPH/ETH pool with hook attached
3. Trigger a test swap → hook fires
4. staticcall selector 0xc815641c on a pool from within the hook → valid uint160 + int24 returned
5. Locate existing SIPH/ETH genesis pool via Initialize events on PoolManager

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Addresses

| Item | Address |

|------|---------|

| SIPHON | 0x60013a6f087cb84b3c28129dac9a568e94d2b384 |

| ETH | 0xD34a99Bc0f67aE1bbd63C660e6d0b0dd03E263B7 |

| PoolManager | 0x8366a39CC670B4001A1121B8F6A443A643e40951 |

| Owner | 0x735121A546092F31050A867FD7E3A750C7B0EFF9 |

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Hook Spec

Name: SiphonDataLogger

Permissions: afterSwap only. All others false.

Owner: as above. pause() / unpause() only.

afterSwap body (entire logic):

1. staticcall Pool A getSlot0 (selector 0xc815641c)
2. staticcall Pool B getSlot0 (selector 0xc815641c)
3. emit PoolData(block, sqrtPriceA, tickA, sqrtPriceB, tickB)
4. return IHook.afterSwap.selector

No TSTORE. No swap execution. No other events.

Pools: Set via constructor or setPools(address[]) (owner only). Support up to 8. v0 uses 2.

event PoolData(uint256 indexed blockNumber, uint160 sqrtPriceA, int24 tickA, uint160 sqrtPriceB, int24 tickB);

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Pool Setup

| Pool | Status | Action |

|------|--------|--------|

| A (genesis) | Exists | Locate via Initialize event. Deliver address + poolId. |

| B (hooked) | New | Create. Same tokens, tickSpacing 100, fee 5000. Attach hook. |

LP for Pool B: $5 ETH + proportional SIPH from owner wallet. Test swaps: 0.001–0.01 ETH.

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Test

1. One swap on Pool B (0.001 ETH)
2. PoolData event in same block
3. Values match actual pool state
4. No extra swaps in tx
5. Deliver: tx hash + decoded event

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Constraints

• getSlot0 selector is 0xc815641c. Not standard v4.
• No calls beyond staticcall to pools for getSlot0
• No TSTORE, no swap execution
• Under 2KB deployed bytecode
• RPC rate-limits eth_getLogs (429). Use eth_call. Retry with backoff.
• Gas is free. Optimize for clarity.
• Non-standard hook attachment → report as Red. Do not guess.

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Acceptance

| Check | Pass |

|-------|------|

| Hook deployed, correct permissions | ✅ |

| Pool A located | ✅ |

| Pool B initialized + hook attached | ✅ |

| LP added | ✅ |

| Test swap → correct event, no extra swaps | ✅ |

| Source in repo, compiles clean | ✅ |

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Deliverables

1. Hook address
2. Pool A address + poolId
3. Pool B address + poolId
4. Test evidence (tx hash + decoded event)
5. Source code in repo
6. LP confirmed on-chain