When the Sequence service encounters an error processing an SDK request, it will respond with:

  1. an HTTP status code
  2. a Sequence error code
  3. a Sequence error message
  4. a data object containing extra information (optional)

Some errors (as denoted in the table below) will instruct the SDK to auto-retry with an exponential backoff until a timeout. If it succeeds, it will not return the error, but if it reaches the timeout, it will return the error.

The SDKs manage idempotency of requests and retries. In most cases, it should not be necessary to implement your own retry logic in addition to what the SDKs provide.

If your application has an operation with multiple Sequence requests that fails partway through, it is safe to retry the step that failed and continue from there, but not necessarily safe to start over.

HTTP Status Code Sequence Error Code Sequence Error Message Auto-retry
400 SEQ008 One or more fields are missing No
400 SEQ050 Alias already exists No
400 SEQ051 Provided fields are exclusive in respect to each other No
400 SEQ052 Invalid key ID No
400 SEQ200 Quorum must be greater than 1 and less than or equal to the length of xpubs No
400 SEQ201 Invalid xpub format No
400 SEQ203 Retrieved type does not match expected type No
400 SEQ204 Root XPubs cannot contain the same key more than once No
400 SEQ600 Malformed pagination parameter after No
400 SEQ601 Incorrect number of arguments to filter No
400 SEQ602 Malformed query filter No
400 SEQ610 Invalid interval No
400 SEQ706* One or more actions had an error: see attached data Depends on the error contained in the action
400 SEQ707 No actions specified for transaction builder No
500 SEQ708 Unexpected item in transaction No
400 SEQ709 Wrong number of signatures No
400 SEQ710 Transaction unbalanced No
400 SEQ711 Transaction exceeds allowed runlimit. Use fewer actions. No
400 SEQ735 Transaction rejected No
500 SEQ739 Error retrieving transaction after submission Yes

Nested Errors

When making a transaction, errors will be returned for individual actions to make it easier to identify what went wrong. The following errors are returned as sub-errors of SEQ706 in the optional data field:

HTTP Status Code Sequence Error Code Sequence Error Message Auto-retry
400 SEQ701 Invalid action type No
400 SEQ702 Invalid ID on action No
400 SEQ703 Invalid action object No
400 SEQ704 Invalid amount in action No
400 SEQ760 Insufficient funds for transaction No
400 SEQ761 Some outputs are reserved; try again Yes
400 SEQ762 Specified asset ID does not match asset ID in output No

Here's an example of accessing action errors in the SDK:

try {
  new Transaction.Builder()
      new Transaction.Builder.Action.Issue()
} catch (APIException e) {
  APIException actionError =;

  // Code: SEQ702 Message: Invalid id on action

  // SEQ702

  // 0, index of action that failed
ledger.transactions.transact(builder => {
    flavorId: 'fake',
    amount: 1,
    destinationAccountId: 'alice',
  () => { /* success */},
  err => {
    let actionError =[0]

    // Invalid id on action

    // SEQ702

    // 0, index of action that failed
  ledger.transactions.transact do |builder|
      flavor_id: 'fake',
      amount: 1,
      destination_account_id: 'alice',
rescue Sequence::APIError => e
  action_error = JSON.parse(e.response.body)['data']['actions'][0]

  p action_error['message']
  // Invalid id on action

  p action_error['seq_code']
  // SEQ702

  p action_error['data']['index']
  // 0, index of action that failed