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DEX Swap Quotes API

Registre officiel Finance et paiements

Best swap quotes across DEXes (Uniswap, SushiSwap, Aerodrome). Base & Ethereum. x402.

Code source Site web Documentation

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

Remote (sse)
Claude Code 
claude mcp add --transport sse dex-swap-quotes-api 'https://dex-quotes.api.klymax402.com/mcp'
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "dex-swap-quotes-api": {
            "type": "sse",
            "url": "https://dex-quotes.api.klymax402.com/mcp"
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. DEX Swap Quotes API
  2. Quickstart -- MCP
  3. Quickstart -- HTTP (x402)
  4. Tools
  5. Example agent prompts
  6. Payment
  7. Part of klymax402
  8. License

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

ToolMethodPathPriceDescription
dex_get_swap_quoteGET/api/quote$0.012Get the best swap quote across multiple DEXes
dex_get_swap_quotePOST/api/quote$0.012Get the best swap quote across multiple DEXes (POST variant)
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

NameTypeRequiredDescription
tokenInstringyesContract address of input token (e.g. 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 for USDC on Base)
tokenOutstringyesContract address of output token (e.g. 0x4200000000000000000000000000000000000006 for WETH on Base)
amountstringyesAmount of input token in raw units (wei/smallest unit, e.g. 1000000 for 1 USDC)
chainstringnoBlockchain network: base or ethereum (default: base)

Returns

  • bestDex -- which DEX offers the best rate (Uniswap, SushiSwap, Aerodrome)
  • amountOut -- expected output token amount
  • priceImpact -- percentage price impact of the trade
  • minimumReceived -- minimum output after slippage tolerance
  • route -- 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).

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. POST variant of dex_get_swap_quote -- same params passed as JSON body instead of query string.

Parameters

NameTypeRequiredDescription
tokenInstringyesContract address of input token (e.g. 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 for USDC on Base)
tokenOutstringyesContract address of output token (e.g. 0x4200000000000000000000000000000000000006 for WETH on Base)
amountstringyesAmount of input token in raw units (wei/smallest unit, e.g. 1000000 for 1 USDC)
chainstringnoBlockchain network: base or ethereum (default: base)

Returns

  • bestDex -- which DEX offers the best rate (Uniswap, SushiSwap, Aerodrome)
  • amountOut -- expected output token amount
  • priceImpact -- percentage price impact of the trade
  • minimumReceived -- minimum output after slippage tolerance
  • route -- 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"
  • "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.

License

MIT

Questions fréquentes

Qu'est-ce que DEX Swap Quotes API ?

Best swap quotes across DEXes (Uniswap, SushiSwap, Aerodrome). Base & Ethereum. x402.

Comment installer DEX Swap Quotes API ?

Il fonctionne comme serveur distant. Dans Claude Code : claude mcp add --transport sse dex-swap-quotes-api 'https://dex-quotes.api.klymax402.com/mcp'. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour DEX Swap Quotes API ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

DEX Swap Quotes API est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient DEX Swap Quotes API ?

Il est publié par Br0ski777. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.