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api.tx.balances.transfer(recipient, new BN(txAmount)).paymentInfo(sender) When I call paymentinfo to get a transaction fee, I got this error. Error: The transactionPaymentApi.queryInfo runtime call is not available in your environment

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    What chain are you querying?
    – Tarik Gul
    Mar 21 at 11:38
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    which version of polkadot.js are you using?
    – pepoviola
    Mar 21 at 11:59

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I used 9.6.2, just upgraded the @polkadot/api to the latest version and it worked as expected. Thank you @Tarik Gul and @pepoviola

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