diff --git a/config/example.paraswap.toml b/config/example.paraswap.toml
index b026716..32ffbcc 100644
--- a/config/example.paraswap.toml
+++ b/config/example.paraswap.toml
@@ -8,3 +8,4 @@ exclude-dexs = ["ParaSwapPool","ParaSwapLimitOrders"] # which dexs to ignore as
 address = "0xdd2e786980CD58ACc5F64807b354c981f4094936" # public address of the solver
 endpoint = "https://apiv5.paraswap.io" # paraswap API URL to use
 partner = "$YOUR_PARTNER_ID"
+chain-id = 1
diff --git a/src/domain/eth/chain.rs b/src/domain/eth/chain.rs
index 08aa75c..c4e4a02 100644
--- a/src/domain/eth/chain.rs
+++ b/src/domain/eth/chain.rs
@@ -6,6 +6,7 @@ pub enum ChainId {
     Mainnet = 1,
     Goerli = 5,
     Gnosis = 100,
+    ArbitrumOne = 42161,
 }
 
 impl ChainId {
@@ -21,6 +22,7 @@ impl ChainId {
             1 => Ok(Self::Mainnet),
             5 => Ok(Self::Goerli),
             100 => Ok(Self::Gnosis),
+            42161 => Ok(Self::ArbitrumOne),
             _ => Err(UnsupportedChain),
         }
     }
@@ -31,6 +33,7 @@ impl ChainId {
             ChainId::Mainnet => "1",
             ChainId::Goerli => "5",
             ChainId::Gnosis => "100",
+            ChainId::ArbitrumOne => "42161",
         }
     }
 
diff --git a/src/infra/config/dex/paraswap/file.rs b/src/infra/config/dex/paraswap/file.rs
index 468c741..2905e38 100644
--- a/src/infra/config/dex/paraswap/file.rs
+++ b/src/infra/config/dex/paraswap/file.rs
@@ -1,6 +1,6 @@
 use {
     crate::{
-        domain::eth,
+        domain::eth::{self, ChainId},
         infra::{config::dex::file, dex::paraswap},
     },
     serde::Deserialize,
@@ -25,6 +25,9 @@ struct Config {
 
     /// Which partner to identify as to the paraswap API.
     pub partner: String,
+
+    /// Which chain the solver is serving.
+    pub chain_id: u64,
 }
 
 /// Load the ParaSwap solver configuration from a TOML file.
@@ -43,6 +46,7 @@ pub async fn load(path: &Path) -> super::Config {
             exclude_dexs: config.exclude_dexs,
             address: config.address,
             partner: config.partner,
+            chain_id: ChainId::new(config.chain_id.into()).unwrap(),
         },
         base,
     }
diff --git a/src/infra/dex/paraswap/dto.rs b/src/infra/dex/paraswap/dto.rs
index dd191cd..b09ca23 100644
--- a/src/infra/dex/paraswap/dto.rs
+++ b/src/infra/dex/paraswap/dto.rs
@@ -75,7 +75,7 @@ impl PriceQuery {
             },
             amount: order.amount.get(),
             exclude_dexs: config.exclude_dexs.clone(),
-            network: "1".to_owned(),
+            network: config.chain_id.network_id().to_string(),
             partner: config.partner.clone(),
             max_impact: 100,
         })
diff --git a/src/infra/dex/paraswap/mod.rs b/src/infra/dex/paraswap/mod.rs
index b0df797..7899280 100644
--- a/src/infra/dex/paraswap/mod.rs
+++ b/src/infra/dex/paraswap/mod.rs
@@ -29,6 +29,9 @@ pub struct Config {
 
     /// Our partner name.
     pub partner: String,
+
+    /// For which chain the solver is configured.
+    pub chain_id: eth::ChainId,
 }
 
 impl ParaSwap {
@@ -98,7 +101,7 @@ impl ParaSwap {
             self.client
                 .post(util::url::join(
                     &self.config.endpoint,
-                    "transactions/1?ignoreChecks=true",
+                    &format!("transactions/{}?ignoreChecks=true", self.config.chain_id.network_id())
                 ))
                 .json(&body)
         )
diff --git a/src/tests/paraswap/mod.rs b/src/tests/paraswap/mod.rs
index c14dfad..49173dc 100644
--- a/src/tests/paraswap/mod.rs
+++ b/src/tests/paraswap/mod.rs
@@ -14,6 +14,7 @@ endpoint = 'http://{solver_addr}'
 exclude-dexs = ['UniswapV2']
 address = '0xE0B3700e0aadcb18ed8d4BFF648Bc99896a18ad1'
 partner = 'cow'
+chain-id = 1
         ",
     ))
 }