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GET
https://starknet.api.avnu.fi
/
swap
/
v3
/
quotes
curl "https://starknet.api.avnu.fi/swap/v3/quotes?sellTokenAddress=0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7&buyTokenAddress=0x4718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d&sellAmount=0x2386f26fc10000"

[
  {
    "quoteId": "69ee30c9-5051-479e-9366-bde0584a2614",
    "sellTokenAddress": "0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
    "sellAmount": "0x2386f26fc10000",
    "sellAmountInUsd": 28.2265,
    "buyTokenAddress": "0x4718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d",
    "buyAmount": "0xd005a71ea99678000",
    "buyAmountInUsd": 28.25618,
    "fee": {
      "feeToken": "0x4718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d",
      "avnuFees": "0xda475abf000",
      "avnuFeesInUsd": 0.000002,
      "avnuFeesBps": "0xf",
      "integratorFees": "0x0",
      "integratorFeesInUsd": 0.0,
      "integratorFeesBps": "0x0"
    },
    "chainId": "0x534e5f4d41494e",
    "blockNumber": "0x3ca1b4",
    "expiry": null,
    "routes": [
      {
        "name": "Nostra",
        "address": "0x49ff5b3a7d38e2b50198f408fa8281635b5bc81ee49ab87ac36c8324c214427",
        "percent": 0.55,
        "sellTokenAddress": "0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
        "buyTokenAddress": "0x4718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d",
        "routes": [],
        "alternativeSwapCount": 0
      },
      {
        "name": "Ekubo",
        "address": "0x5dd3d2f4429af886cd1a3b08289dbcea99a294197e9eb43b0e0325b4b",
        "percent": 0.45,
        "sellTokenAddress": "0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
        "buyTokenAddress": "0x4718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d",
        "routes": [],
        "alternativeSwapCount": 0
      }
    ],
    "gasFees": "0x19b1b3cb5956130",
    "gasFeesInUsd": 0.013633,
    "priceImpact": 10.51,
    "sellTokenPriceInUsd": 2825.618,
    "buyTokenPriceInUsd": 0.117692,
    "estimatedSlippage": 0.00032
  }
]

​
Overview

The quotes endpoint returns the best available swap routes with unique quote IDs for execution. Each quote includes:
  • Optimized routing across multiple DEXs
  • Gas estimation and fees
  • Slippage protection

​
Request

​
sellTokenAddress
string
required
Token address to sell (hex format)
​
buyTokenAddress
string
required
Token address to buy (hex format)
​
sellAmount
string
The amount of token user wants to sell. Either sellAmount or buyAmount required
​
buyAmount
string
The exact amount of token user wants to buy. Either sellAmount or buyAmount required
​
takerAddress
string
Address that will execute the swap
​
size
integer
Maximum number of quotes to return (range: 1-5)
​
integratorFees
string
Fee in basis points (e.g., “30” for 0.3%). When specified, integratorFeeRecipient and integratorName are required.
​
integratorFeeRecipient
string
Address to receive integrator fees. Required when integratorFees is specified.
​
integratorName
string
Your integration identifier for tracking
​
onlyDirect
boolean
If true, only return direct swap routes (no multi-hop)

​
Response

​
quoteId
string
required
Unique identifier for executing this quote (UUID)
​
sellTokenAddress
string
required
Token address being sold
​
sellAmount
string
required
Amount of token to sell (hex format)
​
sellAmountInUsd
number
required
USD value of sell amount
​
buyTokenAddress
string
required
Token address being purchased
​
buyAmount
string
required
Amount of token to receive (hex format). Already includes all fees.
​
buyAmountInUsd
number
required
USD value of buy amount
​
fee
object
required
Fee breakdown for the swap
​
chainId
string
required
Network identifier (e.g., “0x534e5f4d41494e”)
​
blockNumber
string
Block at which quote was generated (hex format)
​
expiry
number
Unix timestamp when quote expires in seconds
​
routes
array
required
Swap routing paths with protocol details
​
gasFees
string
required
Estimated gas cost in STRK (hex format)
​
gasFeesInUsd
number
Gas fees converted to USD
​
priceImpact
number
required
Price impact in USD and in bps
​
sellTokenPriceInUsd
number
Current market price of sell token in USD
​
buyTokenPriceInUsd
number
Current market price of buy token in USD
​
estimatedSlippage
number
Projected slippage percentage
curl "https://starknet.api.avnu.fi/swap/v3/quotes?sellTokenAddress=0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7&buyTokenAddress=0x4718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d&sellAmount=0x2386f26fc10000"

[
  {
    "quoteId": "69ee30c9-5051-479e-9366-bde0584a2614",
    "sellTokenAddress": "0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
    "sellAmount": "0x2386f26fc10000",
    "sellAmountInUsd": 28.2265,
    "buyTokenAddress": "0x4718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d",
    "buyAmount": "0xd005a71ea99678000",
    "buyAmountInUsd": 28.25618,
    "fee": {
      "feeToken": "0x4718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d",
      "avnuFees": "0xda475abf000",
      "avnuFeesInUsd": 0.000002,
      "avnuFeesBps": "0xf",
      "integratorFees": "0x0",
      "integratorFeesInUsd": 0.0,
      "integratorFeesBps": "0x0"
    },
    "chainId": "0x534e5f4d41494e",
    "blockNumber": "0x3ca1b4",
    "expiry": null,
    "routes": [
      {
        "name": "Nostra",
        "address": "0x49ff5b3a7d38e2b50198f408fa8281635b5bc81ee49ab87ac36c8324c214427",
        "percent": 0.55,
        "sellTokenAddress": "0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
        "buyTokenAddress": "0x4718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d",
        "routes": [],
        "alternativeSwapCount": 0
      },
      {
        "name": "Ekubo",
        "address": "0x5dd3d2f4429af886cd1a3b08289dbcea99a294197e9eb43b0e0325b4b",
        "percent": 0.45,
        "sellTokenAddress": "0x49d36570d4e46f48e99674bd3fcc84644ddd6b96f7c741b1562b82f9e004dc7",
        "buyTokenAddress": "0x4718f5a0fc34cc1af16a1cdee98ffb20c31f5cd61d6ab07201858f4287c938d",
        "routes": [],
        "alternativeSwapCount": 0
      }
    ],
    "gasFees": "0x19b1b3cb5956130",
    "gasFeesInUsd": 0.013633,
    "priceImpact": 10.51,
    "sellTokenPriceInUsd": 2825.618,
    "buyTokenPriceInUsd": 0.117692,
    "estimatedSlippage": 0.00032
  }
]

​
Best Practices

With Starknet’s block time of ~2 seconds, quotes become stale after just 1 block. Refresh quotes every 2-3 blocks before execution.
Handle cases where no routes are available due to insufficient liquidity.