Summary
This gives Claude direct access to DEX aggregation across Uniswap, SushiSwap, and Aerodrome on Base and Ethereum networks. It's built around the x402 USDC micropayment protocol, so each quote request costs a small amount but routes through a dedicated API endpoint rather than requiring your own RPC infrastructure. Reach for this when you're building trading tools or portfolio management agents that need real-time swap pricing without maintaining DEX integrations yourself. The SSE transport keeps quote streams live, and the micropayment model means you pay per call rather than dealing with API keys or rate limits.
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Public tool metadata for what this MCP can expose to an agent.
1 tools
dex_get_swap_quoteUse this when you need a swap quote before trading tokens on-chain. Returns the best price across multiple DEXes in JSON. 1. bestDex: which DEX offers the best rate (Uniswap, SushiSwap, Aerodrome) 2.4 params
Use this when you need a swap quote before trading tokens on-chain. Returns the best price across multiple DEXes in JSON. 1. bestDex: which DEX offers the best rate (Uniswap, SushiSwap, Aerodrome) 2.
Parameters* required
chainstringBlockchain network: base or ethereum (default: base)one of
base · ethereumamountstringAmount of input token in raw units (wei/smallest unit, e.g. 1000000 for 1 USDC)
tokenInstringContract address of input token (e.g. 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 for USDC on Base)
tokenOutstringContract address of output token (e.g. 0x4200000000000000000000000000000000000006 for WETH on Base)
DEX Swap Quotes API
Best swap quotes across Uniswap, SushiSwap, Aerodrome -- price impact, route, slippage. Pre-trade essential. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
{
"mcpServers": {
"dex-quotes": {
"url": "https://dex-quotes.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
curl "https://dex-quotes.api.klymax402.com/api/quote?tokenIn=...&tokenOut=...&amount=..."
# -> 402 Payment Required, with an x402 payment challenge in the response body
Any x402-aware client (@x402/fetch, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.
Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
dex_get_swap_quote | GET | /api/quote | $0.005 | Get the best swap quote across multiple DEXes |
dex_get_swap_quote
Use this when you need a swap quote before trading tokens on-chain. Returns the best price across multiple DEXes in JSON.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
tokenIn | string | yes | Contract address of input token (e.g. 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 for USDC on Base) |
tokenOut | string | yes | Contract address of output token (e.g. 0x4200000000000000000000000000000000000006 for WETH on Base) |
amount | string | yes | Amount of input token in raw units (wei/smallest unit, e.g. 1000000 for 1 USDC) |
chain | string | no | Blockchain network: base or ethereum (default: base) |
Returns
bestDex-- which DEX offers the best rate (Uniswap, SushiSwap, Aerodrome)amountOut-- expected output token amountpriceImpact-- percentage price impact of the trademinimumReceived-- minimum output after slippage toleranceroute-- swap path (e.g. USDC -> WETH -> TOKEN)gasEstimateUsd-- estimated gas cost in USD
Example response:
{"bestDex":"Uniswap V3","amountOut":"0.3215","priceImpact":"0.12%","minimumReceived":"0.3183","route":["USDC","WETH"],"gasEstimateUsd":0.04}
When to use: executing any token swap to find the best rate and estimate slippage. Essential for trade sizing and DEX comparison.
Not for: gas estimation only (use gas_get_current_price), yield opportunities (use defi_find_best_yields), wallet balance (use wallet_get_portfolio).
Example agent prompts
- "A swap quote before trading tokens on-chain"
Payment
- Protocol: x402 -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (
eip155:8453) - Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via ATXP (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
License
MIT
Featured
Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Give your AI agent a complete email layer—sending, inbound inboxes, and sandbox testing.
Get 4K emails/month free →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →
