# Very Basic Question about API

**URL:** <https://talk.jelurida.com/t/very-basic-question-about-api/446>\
**Category:** Ardor and Nxt Wallet Users\
**Created:** [19 July 2021 02:19 UTC](https://talk.jelurida.com/t/very-basic-question-about-api/446 "2021-07-19T02:19:38Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![KPho](https://talk.jelurida.com/letter_avatar_proxy/v4/letter/k/8491ac/32.png) [@KPho](https://talk.jelurida.com/u/KPho)\
**Post date:** [19 July 2021 02:19 UTC](https://talk.jelurida.com/t/very-basic-question-about-api/446/1 "2021-07-19T02:19:38Z")

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1. When I use server like [https://ardor.jelurida.com/nxt](https://ardor.jelurida.com/nxt) , it is safe?  
I mean if i don't use localhost, secret phrase will not leak ? right?  
Ex. [https://ardor.jelurida.com/nxt](https://ardor.jelurida.com/nxt)??chain=2&requestType=sendMoney&secretPhrase=IWontTellYou&recipient=ARDOR-4VNQ-RWZC-4WWQ-GVM8S&amountNQT=100000000&feeNQT=1000000&deadline=60

2. What api can know required time for generating next block?

3. What's the difference between ecBlockHeight and default height?  
I cannot understand economic cluster BlockHeight.

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**Author:** ![sergi](https://talk.jelurida.com/user_avatar/talk.jelurida.com/sergi/32/21_2.png) [@sergi](https://talk.jelurida.com/u/sergi)\
**Post date:** [19 July 2021 06:12 UTC](https://talk.jelurida.com/t/very-basic-question-about-api/446/2 "2021-07-19T06:12:08Z")

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1. If you are sending the secret phrase through the API don't trust any external node but yours. I recommend running your own node.
2. I'm not sure to understand your question. If you are referring about the expected time for the next block I guess your best bet would be to use the [https://ardordocs.jelurida.com/Forging#Get\_Next\_Block\_Generators](https://ardordocs.jelurida.com/Forging#Get_Next_Block_Generators) API call and check the first generator's hit time.
3. The _economic cluster_ parameters allow to make sure a given block is present at a given height on the blockchain when sending a transaction. This is useful to detect forks so your transaction won't end up on a forked blockchain.

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**Author:** ![KPho](https://talk.jelurida.com/letter_avatar_proxy/v4/letter/k/8491ac/32.png) [@KPho](https://talk.jelurida.com/u/KPho)\
**Post date:** [19 July 2021 08:39 UTC](https://talk.jelurida.com/t/very-basic-question-about-api/446/3 "2021-07-19T08:39:31Z")

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Thanks for your reply 🙂  
Ardor Lite Wallet which is made by MRV777, use external node API.  
You mean, Ardor Lite Wallet also dangerous?

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**Author:** ![sergi](https://talk.jelurida.com/user_avatar/talk.jelurida.com/sergi/32/21_2.png) [@sergi](https://talk.jelurida.com/u/sergi)\
**Post date:** [19 July 2021 08:53 UTC](https://talk.jelurida.com/t/very-basic-question-about-api/446/4 "2021-07-19T08:53:47Z")

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I didn't say that.

A proper wallet won't be sending the secret phrase to any node as the transactions should be signed locally and then just broadcasted. That's how the built-in reference wallet works. Ardor Lite claims the same on its web page and it's an open source project, so you can do your own research if you like.

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**Author:** ![KPho](https://talk.jelurida.com/letter_avatar_proxy/v4/letter/k/8491ac/32.png) [@KPho](https://talk.jelurida.com/u/KPho)\
**Post date:** [19 July 2021 09:03 UTC](https://talk.jelurida.com/t/very-basic-question-about-api/446/5 "2021-07-19T09:03:59Z")

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I didn't know that lol.  
I need more study. Thanks!!