DEX Token Swap Quote

x402

DEX Token Swap Quote is a paid API for AI agents from 138-197-15-135.sslip.io, paid per call via x402, $0.0045/call, status unknown (last checked 2026-10-31).

Returns a real-time DEX swap quote (price, output amount, venue, gas estimate) for a given token pair and input amount on EVM chains.

Price / call$0.0045

Seller volume →—

Success—

StatusUnknown

How this service works

Best Uniswap v3 single-hop quote for swapping amountIn of tokenIn to tokenOut on Base, Ethereum, Arbitrum or Optimism, checking all fee tiers (0.01/0.05/0.3/1%). Returns amountOut, effective price, best fee tier, gas estimate. Tokens: ETH, USDC, USDT or 0x address. Read-only quote; no swap is executed. Deterministic, no LLM.

Output

Returns a JSON object with the chain, trading venue (e.g. uniswap-v3), fee tier, tokenIn symbol and amount, tokenOut symbol and estimated output amount, the effective price (tokenOut per tokenIn unit), and a gas estimate in gas units for the swap transaction.

Example use cases

Pre-trade price check before swap

“Before I swap 2 ETH to USDC on Base, can you get me a DEX quote showing how much USDC I'd receive and which venue like Uniswap v3 is offering that price?”

Arbitrage opportunity scanning

“Check the on-chain swap price for 1000 USDC to WETH on both Base and Arbitrum — I want to compare the amountOut and see which chain gives a better rate.”

Gas cost estimation for DeFi transaction

“I'm planning to swap 0.5 WETH to USDT on Ethereum — can you get me a quote including the gas estimate so I can decide if the timing makes sense?”

Technical details

Endpoint

GEThttps://138-197-15-135.sslip.io/v1/dex/quote?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a real-time on-chain DEX swap quote for EVM-compatible chains (Base, Ethereum, Arbitrum, Optimism) without executing a trade. It is ideal for pre-trade price checks, arbitrage scanning, DeFi portfolio tooling, and gas estimation. Prefer this over CEX price feeds when you specifically need on-chain DEX venue and fee tier data. It charges per call via x402 USDC micropayments, making it suitable for agent-driven, pay-as-you-go workflows.

Side effects

Unsupported token address returns null fields or error
Invalid amountIn format (non-numeric string) may cause a 400 error
Unsupported chain value returns an error or defaults to Base
Low liquidity pairs may return null amountOut or stale price
Payment failure via x402 results in 402 response before any data is returned

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "chain": "base",
    "price": 2325.41,
    "venue": "uniswap-v3",
    "feeTier": 500,
    "tokenIn": "WETH",
    "amountIn": "1",
    "tokenOut": "USDC",
    "amountOut": "2325.41",
    "gasEstimate": "90000"
  }
}

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