This is my code:

var sourceSecretKey = 'REDACTED';

var sourceKeypair = StellarSdk.Keypair.fromSecret(sourceSecretKey);
var sourcePublicKey = sourceKeypair.publicKey();

var server = new StellarSdk.Server('https://horizon.stellar.org');

    .then(function(account) {            
    var transaction = new StellarSdk.TransactionBuilder(account, {                
        fee: StellarSdk.BASE_FEE        
        // Add a manageOffer operation
        selling: new StellarSdk.Asset.native(),
        buying: new StellarSdk.Asset('ABC', 'GDFBWP6GYJE7PMA4HVLLSPG6346Z67XAME7C2WJIUIA5HGJEJWFWIBPI'),
        amount: '0.001',
        price: '15.6250000',
        offerId: '0'



        .then(function(transactionResult) {

         console.log(JSON.stringify(transactionResult, null, 2));
         console.log('\nSuccess! View the transaction at: ');

        .catch(function(err) {
         console.log('An error has occured:');

    .catch(function(e) {


On submit, it shows an error:

TypeError: buyAmount argument must be of type String, represent a positive number and have at most 7 digits after the decimal
at Function.manageBuyOffer (stellar-sdk.js:43384)
at [.addOperation(StellarSdk.Operation.manageBuyOffer({]

I changed manageBuyOffer to manageSellOffer. It goes through, but the order book for the pair is not updated to reflect this offer. I tried doing the same transaction on stellarx.com, and the transaction went through and the order got reflected in the order book.

I tried another transaction, this time switching the pairs. The amount was "1" and the price "0.0540000". I got an error:

Error: Request failed with status code 400
at createError (stellar-sdk.js:27374)
at settle (stellar-sdk.js:46113)
at XMLHttpRequest.handleLoad (stellar-sdk.js:27236)

I am using the JavaScript SDK and running in the browser. I did the same transaction on stellarx.com, and the transaction went through as expected, and the order got reflected in the order book. I wonder where all these errors are coming from.

1 Answer 1


You have to provide buyAmount instead of amount in manageBuyOffer operations.

The 400 error on the testnet may be cause by different reasons: no trustline, not enough funds, invalid signers, etc. Check the extras.result_codes field in the error object itself.

  • It may be a novice's question, but how do I get the {extras.result_codes} to appear in the console.log? What will I add in my code above?
    – J R
    Sep 21, 2019 at 2:35
  • 1
    Set a breakpoint in your code that handles exceptions and check the error object itself or print the error to console using JSON.stringify(). Like try { horizon.loadAccount('GAB...') } catch(e) { console.log(JSON.stringify(e, null, ' ')) }
    – Orbit Lens
    Sep 21, 2019 at 10:50
  • This part of the code is the one catching the error and it does not return extras.result_codes: .catch(function(err) { console.log('An error has occured:'); console.log(err); });
    – J R
    Sep 21, 2019 at 15:07
  • I did console.log(JSON.stringify(err, null, ' ')); and I can't quite find the extras.result_codes.
    – J R
    Sep 22, 2019 at 0:55

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