Issue when wallet_index is not 0

Upon trying to implemnt Jupiter Ultra API using this example standalone_script_examples/ultra-api/order-and-execute/main.py. It works from SOL to USDC (So11111111111111111111111111111111111111112 -> EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v), however when I try going back USDC -> SOL, I am getting the following error

    signed_transaction = VersionedTransaction(raw_transaction.message, signers)
TypeError: argument 'keypairs': failed to extract enum Signer ('KeypairWrapper | PresignerWrapper | NullSignerWrapper')
- variant KeypairWrapper (KeypairWrapper): TypeError: failed to extract field Signer::KeypairWrapper.0, caused by TypeError: 'Signature' object cannot be converted to 'Keypair'
- variant PresignerWrapper (PresignerWrapper): TypeError: failed to extract field Signer::PresignerWrapper.0, caused by TypeError: 'Signature' object cannot be converted to 'Presigner'
- variant NullSignerWrapper (NullSignerWrapper): TypeError: failed to extract field Signer::NullSignerWrapper.0, caused by TypeError: 'Signature' object cannot be converted to 'NullSigner'

I have discovered that the issue is linked to the index of my (signer) wallet. When it's the first one (wallet_index == 0), it works. When wallet_index > 0 (aka wallet_index == 1) this issue occurs.

List of signers than looks like this

[Signature(
    1111111111111111111111111111111111111111111111111111111111111111,
), Keypair(
    Keypair(
        Keypair {
            secret: SecretKey: [...],
            public: PublicKey(CompressedEdwardsY: [...]), EdwardsPoint{
                X: FieldElement51([...]),
                Y: FieldElement51([...]),
                Z: FieldElement51([...]),
                T: FieldElement51([...])
            }),
        },
    ),
)]

Can you please advise how to swap in the opposite direction? Thanks

I have checked also the example in standalone_script_examples/ultra-api/sell-everything-back-to-sol/main.py and the issue is the same.

I have solved the error using a different approach, maybe it will help

def sign_transaction_v2(unsigned_transaction, wallet):
    # Signers are the first N account keys, where N == len(signatures)
    account_keys = unsigned_transaction.message.account_keys
    num_signers = len(unsigned_transaction.signatures)

    # Locate our wallet among all account keys
    wallet_account_index = account_keys.index(wallet.pubkey())

    # Ensure our wallet is actually a required signer
    if wallet_account_index >= num_signers:
        raise ValueError(
            f"Wallet pubkey is not in the required signers set "
            f"(wallet_index={wallet_account_index}, num_signers={num_signers})"
        )

    # Build signer list: NullSigner for everyone else, Keypair at our signer index
    signers = []
    for i in range(num_signers):
        if i == wallet_account_index:
            signers.append(wallet)
        else:
            # NullSigner needs the corresponding signer pubkey
            signers.append(NullSigner(account_keys[i]))

    signed_tx = VersionedTransaction(unsigned_transaction.message, signers)
    return base64.b64encode(bytes(signed_tx)).decode("utf-8")

Similar issue Jupiter-DevRel/jup-python-sdk#3

GM, I have made on the main branch on this script. Have a look if you can and let me know, I think this fixes the issue

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Issue when wallet_index is not 0 #3

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fniko commented on Oct 9, 2025

fniko commented on Oct 10, 2025

cmoutafidis commented on Nov 25, 2025

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