Solana swap quote (Jupiter)

Executable swap quote on Solana from Jupiter's aggregator: input and output mint, amount in base units, slippage in bps - returns out amount, minimum out after slippage, price impact percent, the routed DEX labels in hop order with split percentages, the USD value of the swap and the context slot. Send POST /api/sol-swap-quote with the required fields inputMint, outputMint and amount and pay $0.003 per call over x402 or MPP (there is no free tier). It returns a JSON object with inputMint, outputMint, inAmount, outAmount, minOutAmount and 9 more.

A real multi-hop route across Solana DEX liquidity, so the number reflects depth, not a spot price. Quote only - nothing is signed or sent. Keyless.

Category: Crypto & onchain data · Tags: solana swap quote jupiter dex price-impact spl · Also found as: solana-swap-quote-jupiter solana-swap-quote jupiter-quote

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Parameters

Example request

curl -i -X POST https://agent402.tools/api/sol-swap-quote \
  -H "Content-Type: application/json" \
  -d '{"inputMint":"So11111111111111111111111111111111111111112","outputMint":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","amount":"1000000000","slippageBps":50}'

Without payment this returns HTTP 402 Payment Required with the exact price for sol-swap-quote; any x402 v2 or MPP client pays it and retries.

Example response

{
  "inputMint": "So11111111111111111111111111111111111111112",
  "outputMint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
  "inAmount": "1000000000",
  "outAmount": "93708783",
  "minOutAmount": "93240240",
  "slippageBps": 50,
  "priceImpactPct": 0,
  "swapUsdValue": 93.7,
  "swapMode": "ExactIn",
  "hops": 2,
  "route": [
    {
      "label": "BisonFi",
      "percent": 100,
      "inputMint": "So11111111111111111111111111111111111111112",
      "outputMint": "Es9v...",
      "inAmount": "1000000000",
      "outAmount": "93720054"
    },
    {
      "label": "SolFi V2",
      "percent": 100,
      "inputMint": "Es9v...",
      "outputMint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
      "inAmount": "93720054",
      "outAmount": "93708783"
    }
  ],
  "contextSlot": 440919041,
  "source": "jupiter",
  "fetchedAt": "2026-08-22T12:00:00.000Z"
}

From an MCP client

catalog.call {
  "slug": "sol-swap-quote",
  "params": {
    "inputMint": "So11111111111111111111111111111111111111112",
    "outputMint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000000000",
    "slippageBps": 50
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for sol-swap-quote; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• inputMint, outputMint and amount are required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/sol-swap-quote returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/sol-swap-quote", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "inputMint": "So11111111111111111111111111111111111111112",
    "outputMint": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000000000",
    "slippageBps": 50
  }),
});

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