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Custom stablecoins (xUSD) are stablecoins issued and managed by Bridge. xUSD is always backed 1:1 by the equivalent value of US dollars. xUSD can be exchanged to and from most stablecoins or fiat using Bridge Orchestration APIs (transfers, liquidation addresses and virtual accounts). When you or your end users want to swap in and out of xUSD we just use our orchestration API endpoints. We support all the same routes here.

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Configuring xUSD

When setting up a custom stablecoin there are a number of steps to complete in the onboarding process.
  • Chain: Which chain you wish to deploy your custom stablecoin. Right now we support xUSD on Solana and all all Bridge supported EVM chains.
  • Token Name: Name of the token.
  • Token ID: Ticker symbol of the token.
  • Token Logo: What image will show up in your app and tracking websites (32x32 pixels)
  • Reserves Strategy: What percentage of your assets you want to hold in cash v.s. treasuries (money market funds). We typically hold ~20% cash to start depending on the nature of your business.
  • Refundable Deposits: The dollar value of xUSD you want to hold in “inventory” so that your end users will be able to swap quickly (without additional minting/burning).
  • Open v.s. Closed Loop: We support both open and closed loop tokens. You can also opt into an interoperability network.
Custom stablecoins can be set up in as little as a day, if no new blockchain support is required.

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Cash Reserves and Refundable Deposits

Cash reserves allow for “fast offramps” because we have the liquidity on hand for users to receive fiat or other stablecoins (e.g. USDC/T) quickly. If there is not enough liquid reserves on hand, we need to sell treasuries which typically settles within a few hours (during ET business day). Refundable deposits allow for “fast onramps” because we will have an inventory of xUSD tokens on hand for users to swap to very quickly. If there are not enough tokens on hand, we perform a minting operation every hour during the busness day. Bridge guarantees real time swaps to and from custom stablecoins during banking hours.

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Interacting with xUSD

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Swapping to xUSD

To swap from fiat or other stablecoins to xUSD you can issue an API call that looks like this:
Request
curl --location --request POST 'https://api.bridge.xyz/v0/transfers' \
--header 'Api-Key: <API Key>' \
--header 'Idempotency-Key: <Unique Idempotency Key>' \
--data-raw '{
  "amount": "10.0",
  "on_behalf_of": "cust_alice",
  "developer_fee": "0.5",
  "source": {
    "payment_rail": "ach",
    "currency": "usd",
    "external_account_id": "840ac7f3-555d-49ff-8128-28709afff2a6"
  },
  "destination": {
    "payment_rail": "solana",
    "currency": "xusd",
    "to_address": "0xtodeadbeef",
  },
}'
Response
{
  "id": "transfer_123",
  "state": "awaiting_funds",
  "on_behalf_of": "cust_alice",
  "amount": "10.0",
  "developer_fee": "0.5",
  "source": {
    "payment_rail": "ach",
    "currency": "usd",
    "external_account_id": "840ac7f3-555d-49ff-8128-28709afff2a6"
  },
  "destination": {
    "payment_rail": "solana",
    "currency": "xusd",
    "to_address": "0xtodeadbeef"
  },
  "receipt": {
    "initial_amount": "10.0",
    "developer_fee": "0.5",
    "exchange_fee": "0.0",
    "gas_fee": "0.0",
    "subtotal_amount": "9.5",
    "final_amount": "9.5",
  },
  "created_at": "2023-05-05T19:39:14.316Z",
  "updated_at": "2023-05-05T19:39:15.231Z"
}

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Swapping from xUSD to Fiat

If you want to convert xUSD to fiat, you can issue an API call like this:
Request
curl --location --request POST 'https://api.bridge.xyz/v0/transfers' \
--header 'Api-Key: <API Key>' \
--header 'Idempotency-Key: <Unique Idempotency Key>' \
--data-raw '{
  "amount": "10.0",
  "on_behalf_of": "cust_alice",
  "developer_fee": "0.5",
  "source": {
    "payment_rail": "solana",
    "currency": "xUSD",
    "from_address": "0xfromdeadbeef"
  },
  "destination": {
    "payment_rail": "ach",
    "currency": "usd",
    "external_account_id": "840ac7f3-555d-49ff-8128-28709afff2a6",
  },
}'
Response
{
  "id": "transfer_123",
  "state": "awaiting_funds",
  "on_behalf_of": "cust_alice",
  "amount": "10.0",
  "developer_fee": "0.5",
  "source": {
    "payment_rail": "ethereum",
    "currency": "xusd",
    "from_address": "0xfromdeadbeef"
  },
  "destination": {
    "payment_rail": "ach",
    "currency": "usd",
    "to_address": "840ac7f3-555d-49ff-8128-28709afff2a6"
  },
  "source_deposit_instructions": {
    "payment_rail": "solana",
    "amount": "10.0",
    "currency": "xUSD",
    "from_address": "0xfromdeadbeef",
    "to_address": "0xtodeadbeef"
  },
  "receipt": {
    "initial_amount": "10.0",
    "developer_fee": "0.5",
    "exchange_fee": "0.0",
    "gas_fee": "0.0",
    "subtotal_amount": "9.5",
    "final_amount": "9.5",
  },
  "created_at": "2023-05-05T19:39:14.316Z",
  "updated_at": "2023-05-05T19:39:15.231Z"
}

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Swapping from xUSD to other stablecoins

If you want to convert xUSD to other stablecoins, like USDC, you can issue an API call like this:
Request
curl --location --request POST 'https://api.bridge.xyz/v0/transfers' \
--header 'Api-Key: <API Key>' \
--header 'Idempotency-Key: <Unique Idempotency Key>' \
--data-raw '{
  "amount": "10.0",
  "on_behalf_of": "cust_alice",
  "developer_fee": "0.5",
  "source": {
    "payment_rail": "solana",
    "currency": "xUSD",
    "from_address": "0xfromdeadbeef"
  },
  "destination": {
    "payment_rail": "ethereum",
    "currency": "usdc",
    "to_address": "0xtodeadbeef",
  },
}'
Response
{
  "id": "transfer_123",
  "state": "awaiting_funds",
  "on_behalf_of": "cust_alice",
  "amount": "10.0",
  "developer_fee": "0.5",
  "source": {
    "payment_rail": "solana",
    "currency": "xUSD",
    "from_address": "0xfromdeadbeef"
  },
  "destination": {
    "payment_rail": "ethereum",
    "currency": "usdc",
    "to_address": "0xtodeadbeef"
  },
  "source_deposit_instructions": {
    "payment_rail": "ethereum",
    "amount": "10.0",
    "currency": "xusd",
    "from_address": "0xfromdeadbeef",
    "to_address": "0xtodeadbeef"
  },
  "receipt": {
    "initial_amount": "10.0",
    "developer_fee": "0.5",
    "exchange_fee": "0.0",
    "gas_fee": "0.0",
    "subtotal_amount": "9.5",
    "final_amount": "9.5",
  },
  "created_at": "2023-05-05T19:39:14.316Z",
  "updated_at": "2023-05-05T19:39:15.231Z"
}

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Reporting and Transparency

We provide the following types of reports:
  • Real time: API endpoints that show:
    • total circulating supply of xUSD and
    • underlying reserve assets that back xUSD
    • token inventory available for swapping
  • Monthly: Summary of transaction activity, balances and earnings delivered by the 5th day of the month.
  • Quarterly: Attestations of our tokens and rewards by an independent third party are available subject to an additional fee.

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Circulating Token Supply

The total circulating supply of xUSD.
Request
curl --request GET 'https://api.bridge.xyz/v0/transparency/xUSD/supply' \ 
     --header 'Content-Type: application/json' \ 
     --header 'Api-Key: <your api key>
Response
"supply": [
    {
      "chain": "solana",
      "currency": "xUSD",
      "amount": "2.0"
    }]
}

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Reserve Assets

The reserve asset (mix of cash and treasuries) that back xUSD.
Request
curl --request GET 'https://api.bridge.xyz/v0/transparency/xUSD/reserves' \     
     --header 'Content-Type: application/json' \ 
     --header 'Api-Key: <your api key>'
Response
{
  "accounts": [
    {
      "asset_class": "cash",
      "currency": "usd",
      "amount": "1.0"
    },
    {
      "asset_class": "managed_money_market",
      "currency": "usd",
      "amount": "1.0"
    }
  ]
}

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Token Inventory

The available inventory balance of xUSD tokens for orchestration.
Request
curl --request GET 'https://api.bridge.xyz/v0/transparency/:symbol/inventory' \     
     --header 'Content-Type: application/json' \ 
     --header 'Api-Key: <your api key>'
Response
{
  "inventory": [
    {
      "chain": "solana",
      "currency": {
        "name": "xUSD",
        "address": "0xdeadbeef"
      },
      "amount": "$5.00 USD"
    }
  ]
}
If you would like to set up a custom stablecoin reach out to sales@bridge.xyz.
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