Jupiter Quotes X402 MCP Server

Jupiter Solana Swap Quote API

Solana swap quotes via Jupiter aggregator -- best route, price impact, slippage, priority fees included. 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": {
    "jupiter-quotes": {
      "url": "https://jupiter-quotes.api.klymax402.com/mcp"
    }
  }
}

Quickstart -- HTTP (x402)

curl "https://jupiter-quotes.api.klymax402.com/api/quote?inputMint=...&outputMint=...&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

jupiter_get_swap_quote

Use this when you need a swap quote on Solana. Returns the best route via Jupiter aggregator across all Solana DEXes with price impact and fee analysis.

Parameters

Returns

• inputToken -- input token symbol and mint address
• outputToken -- output token symbol and mint address
• inAmount -- input amount in raw units
• outAmount -- expected output amount in raw units
• priceImpact -- price impact percentage (e.g. 0.12 = 0.12%)
• minimumReceived -- minimum output after slippage tolerance
• route -- array of DEX hops used (e.g. Raydium -> Orca)
• priorityFee -- recommended priority fee in lamports

Example response:

{"inputToken":{"symbol":"SOL","mint":"So111..."},"outputToken":{"symbol":"USDC","mint":"EPjF..."},"inAmount":"1000000000","outAmount":"67450000","priceImpact":0.05,"minimumReceived":"67112750","route":["Raydium V4"],"priorityFee":5000}

When to use: executing any Solana token swap. Essential for getting the best price, understanding slippage, and choosing the optimal route.

Example agent prompts

• "A swap quote on Solana"

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