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Send USD over Lightning

The GraphQL endpoint to connect to:
A valid authentication token is required in the header as a bearer token:

Get the wallet IDs and check the balances​

Can run this query at any stage to confirm the change in the balances.
The "BTC" wallet balance is denominated in satoshis.
The "USD" wallet balance is in cents.

The body of the GraphQL request

query Me {
  me {
    defaultAccount {
      wallets {
        id
        walletCurrency
        balance
      }
    }
  }
}
curl command to get the USD wallet ID
Estimate the payment fee (probe)​
Estimate the cost of paying a lightning invoice. 

Payments to an other Blink user and to nodes with a direct channel are free.
The body of the GraphQL request
mutation lnUsdInvoiceFeeProbe($input: LnUsdInvoiceFeeProbeInput!) {
  lnUsdInvoiceFeeProbe(input: $input) {
    errors {
      message
    }
    amount
  }
}
Set the variables
curl command to probe invoice fee
Pay a lightning invoice​
Pay a BOLT11 invoice from your USD balance.
The body of the GraphQL request
mutation LnInvoicePaymentSend($input: LnInvoicePaymentInput!) {
  lnInvoicePaymentSend(input: $input) {
    status
    errors {
      message
      path
      code
    }
  }
}
Set the variables
curl command to pay an invoice
tip
To test the GraphQL requests further use the GraphQL playground at api.blink.sv/graphql for mainnet or api.staging.galoy.io/graphql for staging.

Check out the Galoy API Postman collection to find examples in multiple programming languages.