Deposit/Withdrawal Service

Move assets between supported blockchains and NEAR Intents

The Passive Deposit/Withdrawal Service provides an API for moving assets between supported blockchain networks and NEAR Intents. Use it to deposit tokens into the protocol and withdraw them to external chains.

JSON-RPC Endpoint

POST: https://bridge.chaindefuser.com/rpc

There is an SDK for integrating this service: Intents SDK on GitHub. This SDK is under active development and may introduce breaking changes.

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How it works

1. Get supported assets

   Query the service for the list of supported tokens and networks.

2. Get a deposit address

   Request a deposit address for your target chain and NEAR account.

3. Transfer tokens

   Send tokens to the deposit address. They will appear in your NEAR Intents account.

4. Monitor status

   Check deposit and withdrawal status via the API.

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API Reference

supported_tokens

Returns a list of tokens supported by the service for each network.

chains · string[]

Optional chain filter (e.g., ["eth:1", "btc:mainnet"])

Response fields

For each token:

• defuse_asset_identifier - Unique asset ID (format: CHAIN_TYPE:CHAIN_ID:ADDRESS)
• near_token_id - Token ID in the NEAR blockchain
• decimals - Token precision
• asset_name - Token name
• min_deposit_amount - Minimum amount to trigger transfer
• min_withdrawal_amount - Minimum amount for withdrawal
• withdrawal_fee - Fee charged for withdrawals

Request

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "supported_tokens",
  "params": [
    {
      "chains": ["eth:8453"]
    }
  ]
}

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "tokens": [
      {
        "defuse_asset_identifier": "eth:8453:0x123",
        "near_token_id": "...",
        "decimals": 18,
        "asset_name": "PEPE",
        "min_deposit_amount": "100000",
        "min_withdrawal_amount": "10000",
        "withdrawal_fee": "1000"
      }
    ]
  }
}

deposit_address

Returns the address for depositing supported tokens or native currency.

account_id · string · required

Your NEAR Intents account (e.g., user.near)

chain · string · required

Network type and chain ID (e.g., eth:42161 for Arbitrum, btc:mainnet for Bitcoin)

Request

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "deposit_address",
  "params": [
    {
      "account_id": "user.near",
      "chain": "eth:42161"
    }
  ]
}

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "address": "0x...",
    "chain": "eth:42161"
  }
}

recent_deposits

Returns information on recent deposits for an account.

account_id · string · required

Your NEAR Intents account

chain · string · required

Network type and chain ID

Response fields

For each deposit:

• tx_hash - Transaction hash (EVM networks only)
• chain - Network type and chain ID
• defuse_asset_identifier - Token identifier
• decimals - Token decimals
• amount - Asset amount
• account_id - NEAR Intents account
• address - Deposit address
• status - COMPLETED, PENDING, or FAILED

Request

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "recent_deposits",
  "params": [
    {
      "account_id": "user.near",
      "chain": "eth:42161"
    }
  ]
}

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "deposits": [
      {
        "tx_hash": "0x...",
        "chain": "eth:42161",
        "defuse_asset_identifier": "eth:42161:0x123",
        "decimals": 18,
        "amount": "10000000000",
        "account_id": "user.near",
        "address": "0x123",
        "status": "COMPLETED"
      }
    ]
  }
}

withdrawal_status

Returns the status of a withdrawal.

withdrawal_hash · string · required

Hash of the NEAR transaction where ft_burn event occurred

Response fields

• status - COMPLETED, PENDING, FAILED, NOT_FOUND, AWAITING, REJECTED, RETURNING, or RETURNED
• data.tx_hash - Burn transaction hash on NEAR
• data.transfer_tx_hash - Transfer transaction hash on destination chain
• data.chain - Network type and chain ID
• data.defuse_asset_identifier - Token identifier
• data.decimals - Token decimals
• data.amount - Asset amount
• data.account_id - User account
• data.address - Withdrawal address

Request

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "withdrawal_status",
  "params": [
    {
      "withdrawal_hash": "8yFNEk7GmRcM3NMJihwCKXt8ZANLpL2koVFWWH1MEEj"
    }
  ]
}

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "status": "COMPLETED",
    "data": {
      "tx_hash": "8yFNEk7GmRcM3NMJihwCKXt8ZANLpL2koVFWWH1MEEj",
      "transfer_tx_hash": "0x...",
      "chain": "eth:42161",
      "defuse_asset_identifier": "eth:42161:0x123",
      "decimals": 18,
      "amount": "10000000000",
      "account_id": "user.near",
      "address": "0x123"
    }
  }
}

notify_deposit

Optional method to notify the service about your deposit for faster processing.

deposit_address · string · required

Address you received from the API

tx_hash · string · required

Hash of your deposit transaction

Request

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "notify_deposit",
  "params": [
    {
      "deposit_address": "0x...",
      "tx_hash": "0x..."
    }
  ]
}

withdrawal_estimate

Estimate fees for a withdrawal transaction.

chain · string · required

Blockchain network (e.g., eth:1)

token · string · required

Token identifier (e.g., eth.omft.near)

address · string · required

Recipient address

Response fields

• tokenAddress - Token contract address
• userAddress - User’s address
• withdrawalFee - Estimated fee
• withdrawalFeeDecimals - Fee decimal precision
• token - Token information

Request

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "withdrawal_estimate",
  "params": [
    {
      "chain": "eth:1",
      "token": "eth.omft.near",
      "address": "0x456def..."
    }
  ]
}

Response

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "tokenAddress": "0x123abc...",
    "userAddress": "0x456def...",
    "withdrawalFee": "12500000000000000",
    "withdrawalFeeDecimals": 18,
    "token": {
      "defuse_asset_identifier": "0x123abc...",
      "near_token_id": "eth.omft.near",
      "decimals": 18,
      "asset_name": "ETH",
      "min_deposit_amount": "0.001"
    }
  }
}