On-Chain Analysis Skill

Analyze any verified EVM smart contract by pasting its address. The skill runs a full analysis pipeline:

1. ABI Fetching — Retrieves the verified ABI from Etherscan (or accepts a manual ABI)
2. Usage Discovery — Queries Dune to find which methods are most called, by whom, and with what value
3. Decoded Data Tables — AI generates DuneSQL queries using decode_evm_function_call() to build raw decoded data tables on Dune
4. Analytics Generation — A second AI pass generates 6-10 visualization queries (stats, time series, bar charts, pie charts) from the decoded tables
5. Execution — All queries are executed on Dune and results returned as structured JSON

When to Use

• User asks "analyze this contract" or "what does this contract do"
• User wants on-chain analytics, usage stats, or dashboards for a smart contract
• User provides a contract address and wants to understand its activity
• User asks about transaction patterns, caller behavior, or function usage
• User wants to compare function usage or identify top callers
• User asks "who uses this contract" or "how popular is this contract"

How to Call

POST https://esraarlhpxraucslsdle.supabase.co/functions/v1/onchain-analysis

Request Body

{
  "contractAddress": "0x00000000009726632680FB29d3F7A9734E3010E2",
  "chain": "base",
  "abi": "(optional — raw ABI JSON string if contract is unverified)"
}

Parameters

Supported Chains

Response

{
  "contractAddress": "0x...",
  "chain": "base",
  "tldr": "## TLDR\n\n- **Key insight 1** ...\n- **Key insight 2** ...",
  "abiSummary": "Events (5):\n  - Transfer(...)\nWrite Functions (8):\n  - swap(...)",
  "dashboardUrl": "https://onchainwizard.ai/shared/abc123-uuid",
  "topMethods": [
    {
      "function_name": "swap",
      "call_count": 142000,
      "unique_callers": 5200,
      "total_eth": 1234.5678
    }
  ],
  "rawTables": [
    {
      "function_name": "swap",
      "query_id": 12345,
      "dune_url": "https://dune.com/queries/12345",
      "execution_state": "QUERY_STATE_COMPLETED"
    }
  ],
  "queryResults": [
    {
      "id": "total_swaps",
      "title": "Total Swaps",
      "type": "stat",
      "sql": "SELECT COUNT(*) AS value FROM query_12345",
      "rows": [{ "value": 142000 }]
    },
    {
      "id": "daily_swaps",
      "title": "Daily Swap Volume",
      "type": "timeseries",
      "sql": "SELECT DATE_TRUNC('day', block_time) AS date, COUNT(*) AS value FROM query_12345 GROUP BY 1 ORDER BY 1",
      "rows": [
        { "date": "2026-01-01", "value": 500 },
        { "date": "2026-01-02", "value": 620 }
      ]
    }
  ]
}

Query Result Types

How to Present Results

1. Start with the TLDR — display it as markdown to give the user a quick overview
2. Dashboard link — always include the dashboardUrl so the user can view the full interactive dashboard: "📊 View full dashboard"
3. Stat queries (type: "stat") — show as headline metrics (e.g., "Total Swaps: 142,000")
4. Time series (type: "timeseries") — describe trends ("Daily swaps peaked at X on date Y")
5. Bar/Pie charts (type: "bar" / type: "pie") — summarize distributions ("Top 5 callers account for 60% of swaps")
6. Link to Dune — provide dune_url links for raw tables so users can explore further
7. Failed queries — if a query has error instead of rows, mention it briefly but don't block the rest

Example Conversations

Basic: "Analyze this contract"

User: Analyze 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D on ethereum

Action: Call the skill with { "contractAddress": "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D", "chain": "ethereum" }

Present: TLDR → Stats → Trends → Distributions → Dune links

Missing chain

User: What does 0xABC...DEF do?

Action: Ask which chain before calling. "Which chain is this contract on? I support Ethereum, Polygon, BSC, Arbitrum, Optimism, Base, and Avalanche."

Unverified contract

User: Analyze 0xABC...DEF on base

API returns: "Could not fetch ABI"

Action: Ask user for the ABI JSON, then retry with { "contractAddress": "...", "chain": "base", "abi": "" }

Follow-ups after analysis

• "Tell me more about the top callers" → Expand on bar/pie data from queryResults
• "What does the swap function do?" → Use abiSummary to explain
• "Can I see the raw data?" → Link to rawTables[].dune_url

Important Notes

• The analysis takes 2-5 minutes due to Dune query execution and materialization — set user expectations
• Only works for contracts with verified ABIs (unless a manual ABI is provided)
• The AI selects the most interesting functions automatically based on usage data
• Raw decoded tables are saved as named queries on Dune for future reference
• Query results may be empty if the contract has very little on-chain activity

Error Handling