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Skills@432/meta-dex-aggregator

@432/meta-dex-aggregator

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Updated 10-16 10:18

About this skill

Meta DEX Aggregator - Multi-Source Quote Comparison with Safety Layer

Aggregator of aggregators. Queries 5 DEX aggregators in parallel (ParaSwap, Odos, KyberSwap, Matcha/0x, CowSwap), plus 1inch via agent tool call. Ranks by gas-adjusted net output with per-chain live gas prices, and runs safety checks before execution.

Getting Started (First-Time Users)

Do these steps ONCE before your first swap:

Step 1: Get your wallet address

wallet_info()
# Returns: { wallet_address: "0x...", chain_type: "ethereum" }
# Save this - you'll need it as --wallet parameter for all commands

Step 2: Check your balance

wallet_balance(chain="arbitrum")  # or whichever chain you're swapping on
# Confirm you have the source token AND enough ETH/native for gas

Step 3: Set up wallet policy

The wallet needs permission to send transactions. Use wallet_propose_policy:

wallet_propose_policy(
  chain_type="ethereum",
  title="Allow DEX Swaps",
  description="Allow the meta-dex-aggregator to execute swaps and token approvals on EVM chains.",
  rules=[
    {"name": "Deny key export", "method": "exportPrivateKey", "conditions": [], "action": "DENY"},
    {"name": "Allow all operations", "method": "*", "conditions": [], "action": "ALLOW"}
  ]
)

⚠️ Do NOT use "method": "eth_sendTransaction" with empty conditions - Privy rejects this with a 400 error. Always use "method": "*" for broad access.

The user must approve this in the UI before any swaps will work.

Step 4: You're ready

Now follow the Quote → Approve → Execute → Verify workflow below.

Features

  • 5 aggregators queried in parallel (ParaSwap, Odos, KyberSwap, CowSwap, Matcha/0x) + 1inch via agent tool
  • Market orders via 1inch for instant execution (--market-order)
  • Auto-verify post-swap balance checking (--auto-verify)
  • Retry logic with fallback to next best aggregator on failure
  • CowSwap polling for MEV-protected batch auction orders
  • Cross-chain swaps via LI.FI and 1inch Fusion+
  • Historical logging to JSONL for trend analysis
  • Analytics - winner stats, price trends, slippage analysis, CSV export
  • Quote monitoring with alerts when target price is reached

Safety Features

  1. Price Impact - Fetches fair market price from DefiLlama coins API (+ DexScreener fallback), compares vs quote output. Thresholds: 3% warning, 5% high, 10% critical (blocks swap).
  2. Gas-Adjusted Ranking - netOut = amountUsd - gasUsd. Best route ≠ most tokens.
  3. MEV Protection Flags - CowSwap and 0x Gasless are flagged isMEVSafe. Recommends MEV-safe route when within 0.5% of best price.
  4. Slippage Warnings - Sandwich risk >1%, stablecoin pairs >0.05%, too-low revert risk.
  5. Outlier Detection - Quotes >5% worse than best are flagged as outliers.
  6. Post-Swap Verification - Mandatory balance checks, flags >2% deviation.

Aggregators

Adapter API Key Status Notes
ParaSwap None needed ✅
Odos None needed ✅
KyberSwap None needed ✅
CowSwap None needed ⚠️ Rate limited Batch auction - MEV protected, may skip when rate limited
1inch Native tool (platform-proxied) ✅ Call oneinch_quote() separately, merge manually
Matcha/0x OX_API_KEY in .env ✅

MEV Protection: CowSwap uses off-chain batch auctions (solvers compete, no mempool exposure). The safety layer flags it when available. All aggregators are safe - CowSwap just has extra protection.

Note: CowSwap's public API is rate limited. The script gracefully skips it when rate limited (429). 1inch requires an API key, so the agent calls the platform's oneinch_quote tool (proxied, no user key needed) and merges the result into the comparison table.

CowSwap specifics: Gasless for the user (solvers pay gas). Supported on Ethereum, Arbitrum, Gnosis, Base. Uses wrapped native tokens (WETH) internally - raw ETH is auto-converted. Execution is order-based (EIP-712 signed intent), not raw transaction.

Wallet Policy

See Getting Started → Step 3 above. Policy must be approved by the user before any swap can execute.

Workflow: Quote with Safety Check

Step 1 & 2 run in PARALLEL (no dependency between them):

# 1. Get 4 aggregator quotes (ParaSwap, Odos, KyberSwap, Matcha/0x + safety)
cd skills/meta-dex-aggregator/scripts && \
  python3 meta_dex.py quote --chain base --from ETH --to USDC --amount 0.5 --slippage 0.5

# 2. Get 1inch quote via native tool (proxied, no API key needed)
oneinch_quote(chain="base", src="<from_addr>", dst="<to_addr>", amount="<amount_in_wei>")
# Returns: { "dstAmount": "<raw_amount>" }
# Convert: dstAmount / 10^decimals = human amount

Step 3 - Merge & present:

  • Script returns quotes with: aggregator, amountOutHuman, amountUsd, gasUsd, netOut, vsbestPct
  • 1inch native tool returns dstAmount (raw wei) - convert to human amount using token decimals
  • Insert 1inch into the ranked table, recalculate vsbestPct if 1inch is the new winner
  • The script's safety block (priceImpact, slippageWarnings, recommendation) applies to all quotes
  • If priceImpact.severity is "high"/"critical" - WARN and block the swap
  • Execute via oneinch_swap if 1inch wins, or wallet_transfer with tx data for others (see Execution section below for exact param mapping)

Pre-Swap: Token Approval (REQUIRED for ERC-20 source tokens)

Before executing ANY swap where the source token is an ERC-20 (not native ETH), you MUST check and approve the token allowance.

Native ETH (0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE) does NOT need approval. All other tokens do.

# Step 1: Check if the 1inch router has allowance to spend your source token
oneinch_check_allowance(chain="arbitrum", token_address="0xaf88d065e77c8cC2239327C5EDb3A432268e5831")
# Returns: { "allowance": "0", "needs_approval": true }

# Step 2: If needs_approval is true, approve the token
oneinch_approve(chain="arbitrum", token_address="0xaf88d065e77c8cC2239327C5EDb3A432268e5831")
# Returns: { "tx_hash": "0x..." }

# Step 3: Now proceed with the swap

When to check:

  • Swapping USDC → ETH? Check USDC allowance first.
  • Swapping ETH → USDC? No approval needed (ETH is native).
  • Swapping USDC → WBTC? Check USDC allowance first.
  • Any ERC-20 as source = check allowance → approve if needed → then swap.

For non-1inch aggregators (ParaSwap, Odos, KyberSwap, etc.): Some aggregators handle approval internally in the tx calldata. However, if the swap tx reverts, check allowance for the aggregator's router address (returned as tokenApprovalAddress in the quote). Only 1inch market orders via oneinch_swap use the explicit oneinch_check_allowance / oneinch_approve flow above.

Workflow: Execute Swap

  • --market-order flag for instant 1inch execution (no limit order failures)
  • --auto-verify flag for automatic balance fetching (no manual args)
  • Retry logic with fallback to next best aggregator on failure

Option A: Market Order (Recommended for < $100 swaps)

# Instant execution via 1inch market order
cd skills/meta-dex-aggregator/scripts && \
  python3 meta_dex.py execute --chain arbitrum --from ETH --to USDC --amount 0.005 \
    --market-order --wallet 0x... --slippage 2.0

# Response:
# {
#   "step": "market_order_ready",
#   "mode": "market_order",
#   "instruction": "Execute via oneinch_swap(chain='arbitrum', src='0x...', dst='0x...', amount='...', slippage=2.0)"
# }

# Agent executes:
oneinch_swap(chain="arbitrum", src="0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE", dst="0xFF970A61A04b1cA14834A43f5dE4533eBDDB5CC8", amount="5000000000000000", slippage=2.0)

# Auto-verify after execution:
python3 meta_dex.py execute --chain arbitrum --from ETH --to USDC --amount 0.005 \
  --market-order --wallet 0x... --auto-verify --expected-out <actual_received_wei>

Option B: Limit Order with Auto-Verification

# Get quote and execute
python3 meta_dex.py execute --chain arbitrum --from ETH --to USDC --amount 0.005 \
  --aggregator kyberswap --wallet 0x... --slippage 1.0

# Execute tx via wallet_transfer...

# Auto-verify (no manual balance args needed):
python3 meta_dex.py execute --chain arbitrum --from ETH --to USDC --amount 0.005 \
  --aggregator kyberswap --wallet 0x... --verify --auto-verify --expected-out 10770000

Option B: Manual swap (legacy)

# Get swap tx data
python3 meta_dex.py swap --chain base --from ETH --to USDC --amount 0.5 \
  --aggregator odos --wallet 0x... --slippage 0.5

# Execute and verify manually (see Post-Swap Verification section)

Executing via wallet_transfer (ParaSwap, Odos, KyberSwap, Matcha/0x)

The execute command returns a tx object. Map it to wallet_transfer like this:

# Script returns:
# { "tx": { "to": "0xRouterAddr", "data": "0xCalldata...", "value": "500000000000000", "gas": "300000" }, "chainId": 42161 }

# Agent calls:
wallet_transfer(
  to="0xRouterAddr",           # tx.to
  amount="500000000000000",    # tx.value (in wei - "0" if selling ERC-20, not native)
  data="0xCalldata...",        # tx.data (the swap calldata)
  chain_id=42161,              # chainId from the result
  gas_limit="300000"           # tx.gas (optional but recommended)
)

Chain ID reference: ethereum=1, arbitrum=42161, base=8453, optimism=10, polygon=137, bsc=56, avalanche=43114, gnosis=100

Executing CowSwap orders (EIP-712 signing)

CowSwap is order-based, not transaction-based. When the execute command returns orderType: "cowswap_order":

  1. The result contains eip712Data with the order to sign
  2. Sign it with wallet_sign_typed_data(domain=..., types=..., primaryType=..., message=...)
  3. Submit the signed order to CowSwap API via bash curl
  4. Poll with the built-in cowswap_poll_order function or check the pollEndpoint URL
  5. CowSwap orders are filled by solvers asynchronously (up to 2 minutes)

If CowSwap seems complex, prefer --market-order for simplicity - it uses 1inch and executes instantly.

Post-Swap Verification (MANDATORY)

Use the execute --verify command for automatic verification.

Manual verification workflow (if not using execute command):

# 1. Record balances BEFORE the swap
wallet_balance(chain="base", asset="eth")   → pre_from_balance
wallet_balance(chain="base", asset="usdc")  → pre_to_balance

# 2. Execute the swap (wallet_transfer or oneinch_swap)

# 3. For CowSwap: poll until fulfilled
# Use cowswap_poll_order(chain, order_uid) function
# Poll every 5s for up to 180s

# 4. Verify balances AFTER the swap
wallet_balance(chain="base", asset="eth")   → post_from_balance
wallet_balance(chain="base", asset="usdc")  → post_to_balance

# 5. Verify with CLI
python3 meta_dex.py execute --verify \
  --chain base --from ETH --to USDC --amount 0.5 --aggregator kyberswap \
  --wallet 0x... \
  --pre-from-balance <pre_eth> --pre-to-balance <pre_usdc> \
  --post-from-balance <post_eth> --post-to-balance <post_usdc> \
  --expected-out <expected_out_wei>

# Returns: {"verification": "PASSED"|"FAILED", "deviationPct": 0.5, ...}

Rules:

  • Never report success without checking post-swap balances - tx confirmed ≠ expected outcome
  • Compare actual received vs quoted amount - if deviation >2%, flag it to the user
  • For CowSwap orders: Orders are filled asynchronously by solvers (can take up to 2 minutes). Use cowswap_poll_order(chain, order_uid) to poll until status == "fulfilled".
  • For 1inch via oneinch_swap: The tool returns a tx hash. Wait for confirmation, then check balances.
  • Include in confirmation: tx hash, actual amounts spent/received, price achieved (received/spent)

Cross-Chain Swaps

When src_chain ≠ dst_chain, use xquote to compare cross-chain routes:

python3 skills/meta-dex-aggregator/scripts/meta_dex.py xquote \
  --src-chain arbitrum --dst-chain polygon \
  --from ETH --to USDC --amount 0.5 \
  --wallet $WALLET --slippage 3

Cross-chain sources:

  • LI.FI - aggregates 20+ bridges (Relay, Stargate, Across, Hop, etc.). Returns ready-to-sign tx data. Execute via wallet_transfer(to, amount=value, data, chain_id, gas_limit). Track status with curl -s "https://li.quest/v1/status?txHash={hash}&fromChain={src_id}&toChain={dst_id}".
  • 1inch Fusion+ - intent-based atomic swaps (gasless, resolver handles both chains). The script returns a needsToolCall: true marker. Complete with oneinch_cross_chain_quote tool for the quote, then oneinch_cross_chain_swap for execution.

Cross-chain workflow:

  1. Run xquote → get LI.FI routes + 1inch Fusion+ marker
  2. Call oneinch_cross_chain_quote tool to fill in the 1inch quote
  3. Compare all routes: output amount, total fees (gas + bridge + protocol), estimated time
  4. Present table to user with clear winner
  5. For execution: LI.FI routes → wallet_transfer with tx data; 1inch → oneinch_cross_chain_swap
  6. Cross-chain is non-atomic - track status and confirm delivery on destination chain

Safety notes for cross-chain:

  • Default slippage 3% (bridges need more than same-chain swaps)
  • Always show estimated delivery time (4s to 10min depending on bridge)
  • Always show fee breakdown (gas + bridge fees + protocol fees)
  • After execution, track until funds arrive on destination chain
  • LI.FI DONE/PARTIAL means bridge delivered but not the final token - may need a manual swap

Historical Quote Logging

Every quote is automatically logged to skills/meta-dex-aggregator/logs/{chain}_{FROM}_{TO}.jsonl.

What's logged:

  • Timestamp, chain, tokens, amount
  • All aggregator quotes (amount, gas, netOut, vsBest)
  • Winner aggregator
  • Net output in USD

Log retention: Unlimited (append-only JSONL). Manually prune old logs if needed.

Analytics Commands

Winner Statistics

python3 meta_dex.py stats --chain arbitrum --from ETH --to USDC --days 7

Shows which aggregator wins most often, win rates, and average net output per aggregator.

Price Trends

python3 meta_dex.py trend --chain arbitrum --from ETH --to USDC --days 7 --bucket-hours 4

Shows net output over time in 4-hour buckets (avg, min, max, count).

Slippage Analysis

python3 meta_dex.py slippage --chain arbitrum --from ETH --to USDC --days 7

Analyzes competitive spreads between top 2 aggregators. Low spread = highly competitive.

CSV Export

python3 meta_dex.py export --chain arbitrum --from ETH --to USDC --days 30 --output /tmp/quotes.csv

Exports all quotes to CSV for external analysis (Excel, Python, etc.).

Quote Monitoring

Monitor for a target net output and alert when reached:

python3 meta_dex.py monitor --chain arbitrum --from ETH --to USDC --amount 1.0 \
  --target-net-out 2050 --interval 60 --max-runs 10
  • Polls every 60 seconds
  • Stops when net output ≥ $2050
  • Max 10 polls (omit for unlimited)
  • Returns immediately when target is met

Use case: "Alert me when ETH→USDC on Arbitrum nets >$2050 after gas"

Run this as a background task with sessions_spawn for non-blocking monitoring.

Token Resolution - Smart Confirmation

Token resolution is tiered to avoid bothering the user for obvious tokens while protecting against picking the wrong contract for ambiguous ones.

Confidence levels returned by resolve_token:

Confidence Meaning Action
trusted Hardcoded canonical address (USDC, WETH, WBTC, etc.) ✅ Auto-use, no confirmation
exact User provided a 0x address directly ✅ Auto-use, no confirmation
single Only one token matches the symbol on this chain ✅ Auto-use, no confirmation
high Multiple matches but top has >10x volume of runner-up ✅ Auto-use, no confirmation
ambiguous Multiple plausible matches, none dominant ⚠️ MUST confirm with user

When confidence == "ambiguous":

The result includes a candidates list. Present them to the user:

I found multiple tokens matching "XYZ" on Arbitrum:

1. XYZ (XYZ Protocol) - 0x1234...5678 - $2.3M 24h vol
2. XYZ (XYZ Finance) - 0xabcd...ef01 - $180K 24h vol
3. XYZ (Old XYZ) - 0x9876...5432 - $12K 24h vol

Which one did you mean? (or paste the contract address directly)

Once the user picks, re-call with the address directly to bypass resolution.

Trusted token coverage:

Ethereum, Arbitrum, Base, Optimism, Polygon, BSC, Avalanche, Gnosis - all major tokens (WETH, USDC, USDT, DAI, WBTC, LINK, UNI, AAVE, stETH, plus chain-specific tokens like ARB, OP, AERO, GMX, etc.)

Chain Support

ethereum, bsc, polygon, optimism, arbitrum, avalanche, gnosis, fantom, zksync, base, linea, scroll, sonic, unichain

Safety Response Format

The quote command returns a safety block:

{
  "recommendation": "✅ All checks passed. Best route looks safe.",
  "priceImpact": {"value": 0.02, "severity": "ok"},
  "slippageWarnings": [],
  "marketPrices": {"gas_token_price": 2170, "from_token_price": 2170, "to_token_price": 1.0}
}

Severity levels: ok | warning (3%) | high (5%) | critical (10%)

CRITICAL: If severity is "high" or "critical", BLOCK the swap and warn the user explicitly.