A13: DeFi Builder

7-8 points: Both ERC-20 tokens deployed successfully with custom names/symbols. Tokens have correct totalSupply, balanceOf works, approve and transferFrom functional.

5-6 points: Both tokens deployed and mostly functional. Minor issues (e.g. forgot custom name, used default values) but tokens work for DEX operations.

3-4 points: Only one token deployed successfully, or both deployed but with functional issues (e.g. approve not working properly).

1-2 points: Tokens deployed but cannot be used with the DEX (missing approve/transferFrom).

0 points: No tokens deployed or tokens do not compile.

9-10 points: SimpleDEX deployed with correct token addresses. Liquidity added successfully (both tokens transferred to DEX). Reserves show correct values. Student can explain each deployment step.

7-8 points: DEX deployed and liquidity added, but minor issues (e.g. uneven initial liquidity, needed multiple attempts).

5-6 points: DEX deployed but liquidity addition had problems (e.g. forgot to approve first, only partial liquidity added).

2-4 points: DEX deployed but could not add liquidity. Student understands the concept but has technical difficulties.

0-1 points: DEX not deployed or does not compile.

10-12 points: Completed 3+ swaps with varying sizes (small, medium, large). At least one reverse swap. All swaps execute without errors. Student can read transaction logs and explain output amounts.

• 4 pts per swap type: small swap (1000), medium swap (10000), large swap (50000)
• Bonus consideration for reverse swap and additional experiments

7-9 points: Completed 2-3 swaps successfully. May be missing the reverse swap or one size category.

4-6 points: Completed 1-2 swaps. May have had reverts or needed significant instructor help.

1-3 points: Attempted swaps but most reverted. Shows understanding of the process but cannot execute reliably.

0 points: No successful swaps.

5-6 points: All rows of the worksheet completed:

• Initial reserves recorded correctly
• After-swap reserves for each swap
• Output amounts match transaction logs
• Data is consistent and clearly organised

4 points: Most rows filled in but minor gaps or inconsistencies (e.g. missing one swap's data).

2-3 points: Partial data recorded. Some key values missing or clearly incorrect (not matching actual transaction results).

0-1 points: Worksheet mostly empty or data is fabricated.

5 points: For each swap:

• Effective price calculated correctly (amount out / amount in)
• k = reserveA × reserveB computed and shown to be approximately constant
• Price impact noted (deviation from initial 1:1 ratio)

4 points: Calculations mostly correct with minor arithmetic errors. k verification attempted but may have small discrepancies.

2-3 points: Some calculations attempted but with errors. k verification missing or incorrect.

0-1 points: No calculations or fundamentally wrong approach.

4 points: Thoughtful answers to all analysis questions demonstrating understanding of:

• Why larger swaps have worse effective prices (price impact)
• Why k stays approximately constant
• Connection to real-world DEXes and slippage

3 points: Answers most questions correctly with reasonable depth.

2 points: Answers are superficial or partially incorrect.

0-1 points: Analysis questions unanswered or completely incorrect.

7-8 points: Presentation demonstrates:

• Correct explanation of AMM pricing mechanics
• Accurate description of price impact from their swap data
• Valid connection between their experiment and real DEXes
• Answers questions correctly and confidently

5-6 points: Mostly accurate content with minor technical errors. Covers all required sections but some explanations lack depth.

3-4 points: Basic understanding shown but significant gaps (e.g. cannot explain why price changed, incorrect formula reference).

1-2 points: Major technical errors or fundamental misunderstanding of how the DEX works.

0 points: Did not present or completely incorrect.

4 points:

• Clear, well-organised presentation flow
• Uses concrete numbers from their worksheet to illustrate points
• All group members contribute
• Screen shared effectively to show Remix results

3 points: Generally clear communication with minor organisation issues.

2 points: Somewhat unclear or disorganised. Uneven participation.

1 point: Difficult to follow or single member dominates.

0 points: Incomprehensible or unprofessional presentation.

3 points: Completes presentation within 3-minute window (+/- 15 seconds), well-rehearsed, smooth transitions.

2 points: Slightly over/under time (+/- 30 seconds) but shows preparation.

1 point: Significantly over/under time or appears under-prepared.

0 points: Grossly inappropriate time usage or clearly unprepared.

5 points: Modified swap function includes _minOut parameter with working require(amountOut >= _minOut) check. Demonstrated a swap that succeeds when minOut is reasonable and one that reverts when minOut is set too high.

3-4 points: Slippage parameter added and mostly works but missing the demonstration of a reverted transaction.

1-2 points: Attempted modification but it does not compile or function correctly. Shows understanding of the concept.

5 points: Escrow contract from L11 deployed alongside DEX. Demonstrated a complete escrow flow: deposit, confirm delivery or dispute. Can explain how escrow complements DEX trading.

3-4 points: Escrow deployed and partially demonstrated. Some steps missing but concept understood.

1-2 points: Escrow deployed but could not complete the flow. Shows effort and conceptual understanding.