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I want to approve token spending on Uniswap for a token I don't own. Uniswap UI won't let me do that (instead it displays a gray out button "insufficient balance").

Seems the only option would be to manually approve the token using Etherscan.

Which Uniswap contract should I interact with? (v2) What are the required parameters and what is the uint for infinite approval?

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  • You want to approve before getting the token? why not just do it once you have it?
    – Markus - soliditydeveloper.com
    Commented Oct 5, 2020 at 6:54
  • Because i need to dump it as fast as possible once i have it.
    – Pm Rivière
    Commented Oct 5, 2020 at 7:13

1 Answer 1

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  1. Get the pool address

Go to the Uniswap UI at https://app.uniswap.org/. Choose the token pair you want and then click the View pair analytics ↗. This will take you to a link like https://uniswap.info/pair/<poolAddress>. Note down poolAddress.

  1. Approve via Etherscan

Go to https://etherscan.io/token/<tokenAddress>#writeContract where tokenAddress is the one you want to approve. Go to the approve tab and now enter poolAddress + amount.

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  • Thx @markus just a few questions: (1) I want to approve the token for swapping, but still need the pool address right? (2) What value should i give to amount should i fill for infinite approval?
    – Pm Rivière
    Commented Oct 5, 2020 at 7:31
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    @PmRivière (1) Yeah, what did you think? (2) Go for infinite sure. I think even the Uniswap UI does this.
    – Markus - soliditydeveloper.com
    Commented Oct 5, 2020 at 7:53
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    Infinite would mean 2^256 - 1.
    – Markus - soliditydeveloper.com
    Commented Oct 5, 2020 at 7:54
  • Just how do i key in 256^-1? it's a UINT256 expected. That would mean i just key in -1?
    – Pm Rivière
    Commented Oct 5, 2020 at 8:53
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    @PmRivière "115792089237316195423570985008687907853269984665640564039457584007913129639935"
    – Markus - soliditydeveloper.com
    Commented Oct 5, 2020 at 21:13

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