diff --git a/src/abi/ERC20.abi.json b/src/abi/ERC20.abi.json
new file mode 100644
index 0000000..694c759
--- /dev/null
+++ b/src/abi/ERC20.abi.json
@@ -0,0 +1,303 @@
+[
+  {
+    "inputs": [
+      {
+        "internalType": "string",
+        "name": "name_",
+        "type": "string"
+      },
+      {
+        "internalType": "string",
+        "name": "symbol_",
+        "type": "string"
+      },
+      {
+        "internalType": "uint8",
+        "name": "decimals_",
+        "type": "uint8"
+      },
+      {
+        "internalType": "uint256",
+        "name": "initialBalance_",
+        "type": "uint256"
+      },
+      {
+        "internalType": "address payable",
+        "name": "feeReceiver_",
+        "type": "address"
+      }
+    ],
+    "stateMutability": "payable",
+    "type": "constructor"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "owner",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "spender",
+        "type": "address"
+      },
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "value",
+        "type": "uint256"
+      }
+    ],
+    "name": "Approval",
+    "type": "event"
+  },
+  {
+    "anonymous": false,
+    "inputs": [
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "from",
+        "type": "address"
+      },
+      {
+        "indexed": true,
+        "internalType": "address",
+        "name": "to",
+        "type": "address"
+      },
+      {
+        "indexed": false,
+        "internalType": "uint256",
+        "name": "value",
+        "type": "uint256"
+      }
+    ],
+    "name": "Transfer",
+    "type": "event"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "owner",
+        "type": "address"
+      },
+      {
+        "internalType": "address",
+        "name": "spender",
+        "type": "address"
+      }
+    ],
+    "name": "allowance",
+    "outputs": [
+      {
+        "internalType": "uint256",
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "spender",
+        "type": "address"
+      },
+      {
+        "internalType": "uint256",
+        "name": "amount",
+        "type": "uint256"
+      }
+    ],
+    "name": "approve",
+    "outputs": [
+      {
+        "internalType": "bool",
+        "name": "",
+        "type": "bool"
+      }
+    ],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "account",
+        "type": "address"
+      }
+    ],
+    "name": "balanceOf",
+    "outputs": [
+      {
+        "internalType": "uint256",
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "decimals",
+    "outputs": [
+      {
+        "internalType": "uint8",
+        "name": "",
+        "type": "uint8"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "spender",
+        "type": "address"
+      },
+      {
+        "internalType": "uint256",
+        "name": "subtractedValue",
+        "type": "uint256"
+      }
+    ],
+    "name": "decreaseAllowance",
+    "outputs": [
+      {
+        "internalType": "bool",
+        "name": "",
+        "type": "bool"
+      }
+    ],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "spender",
+        "type": "address"
+      },
+      {
+        "internalType": "uint256",
+        "name": "addedValue",
+        "type": "uint256"
+      }
+    ],
+    "name": "increaseAllowance",
+    "outputs": [
+      {
+        "internalType": "bool",
+        "name": "",
+        "type": "bool"
+      }
+    ],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "name",
+    "outputs": [
+      {
+        "internalType": "string",
+        "name": "",
+        "type": "string"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "symbol",
+    "outputs": [
+      {
+        "internalType": "string",
+        "name": "",
+        "type": "string"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [],
+    "name": "totalSupply",
+    "outputs": [
+      {
+        "internalType": "uint256",
+        "name": "",
+        "type": "uint256"
+      }
+    ],
+    "stateMutability": "view",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "recipient",
+        "type": "address"
+      },
+      {
+        "internalType": "uint256",
+        "name": "amount",
+        "type": "uint256"
+      }
+    ],
+    "name": "transfer",
+    "outputs": [
+      {
+        "internalType": "bool",
+        "name": "",
+        "type": "bool"
+      }
+    ],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
+    "inputs": [
+      {
+        "internalType": "address",
+        "name": "sender",
+        "type": "address"
+      },
+      {
+        "internalType": "address",
+        "name": "recipient",
+        "type": "address"
+      },
+      {
+        "internalType": "uint256",
+        "name": "amount",
+        "type": "uint256"
+      }
+    ],
+    "name": "transferFrom",
+    "outputs": [
+      {
+        "internalType": "bool",
+        "name": "",
+        "type": "bool"
+      }
+    ],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  }
+]
diff --git a/src/config.rs b/src/config.rs
index a58422e..25cc841 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -13,6 +13,8 @@ pub struct Config {
     #[serde_as(as = "DisplayFromStr")]
     pub escrow_subgraph: Url,
     pub graph_env: String,
+    pub grt_contract: Address,
+    pub grt_allowance: u64,
     pub kafka: Kafka,
     #[serde_as(as = "DisplayFromStr")]
     pub network_subgraph: Url,
diff --git a/src/main.rs b/src/main.rs
index 2374813..fb931e9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -30,6 +30,7 @@ use crate::receipts::track_receipts;
 #[global_allocator]
 static ALLOC: snmalloc_rs::SnMalloc = snmalloc_rs::SnMalloc;
 
+abigen!(ERC20, "src/abi/ERC20.abi.json");
 abigen!(Escrow, "src/abi/Escrow.abi.json");
 
 const GRT: u128 = 1_000_000_000_000_000_000;
@@ -61,10 +62,14 @@ async fn main() -> anyhow::Result<()> {
             .build()?,
     ));
     let provider = Arc::new(SignerMiddleware::new(provider, sender.clone()));
-    let contract = Escrow::new(
+    let escrow = Escrow::new(
         ethers::abi::Address::from(config.escrow_contract.0 .0),
         provider.clone(),
     );
+    let token = ERC20::new(
+        ethers::abi::Address::from(config.grt_contract.0 .0),
+        provider.clone(),
+    );
 
     let http_client = reqwest::Client::builder()
         .timeout(Duration::from_secs(10))
@@ -105,7 +110,7 @@ async fn main() -> anyhow::Result<()> {
         signature.s.to_big_endian(&mut proof[32..64]);
         proof[64] = signature.v as u8;
         let proof: Bytes = proof.into();
-        let tx = contract.authorize_signer(signer.address(), deadline, proof);
+        let tx = escrow.authorize_signer(signer.address(), deadline, proof);
         match tx.send().await {
             Ok(result) => {
                 result.await.context("authorize tx provider error")?;
@@ -124,6 +129,24 @@ async fn main() -> anyhow::Result<()> {
         tracing::info!(signer = %signer.address(), "authorized");
     }
 
+    let allowance = token
+        .allowance(sender.address(), escrow.address())
+        .await
+        .context("get allowance")?;
+    let expected_allowance = U256::from(config.grt_allowance as u128 * GRT);
+    tracing::info!(allowance = allowance.as_u128() as f64 * 1e-18);
+    if allowance < expected_allowance {
+        token
+            .approve(escrow.address(), expected_allowance)
+            .await
+            .context("approve")?;
+    }
+    let allowance = token
+        .allowance(sender.address(), escrow.address())
+        .await
+        .context("get allowance")?;
+    tracing::info!(allowance = allowance.as_u128() as f64 * 1e-18);
+
     let debts = track_receipts(&config.kafka, config.graph_env)
         .await
         .context("failed to start kafka client")?;
@@ -181,7 +204,7 @@ async fn main() -> anyhow::Result<()> {
                 .collect();
             let amounts: Vec<ethers::types::U256> =
                 adjustments.iter().map(|(_, a)| U256::from(*a)).collect();
-            let tx = contract.deposit_many(receivers, amounts);
+            let tx = escrow.deposit_many(receivers, amounts);
             let pending = match tx.send().await {
                 Ok(pending) => pending,
                 Err(contract_call_err) => {
@@ -339,7 +362,7 @@ mod tests {
     fn next_balance() {
         let tests = [
             (0, MIN_DEPOSIT),
-            (1 * GRT, MIN_DEPOSIT),
+            (GRT, MIN_DEPOSIT),
             (MIN_DEPOSIT / 2, MIN_DEPOSIT),
             (MIN_DEPOSIT, MIN_DEPOSIT * 2),
             (MIN_DEPOSIT + 1, MIN_DEPOSIT * 2),