Merge fee, fix links

SUMMARY.md

@@ -21,6 +21,7 @@
   * [DApp](wallet-connect/dapp.md)
 * [Assets](assets/add_new_asset.md)
   * [DApps](assets/add-dapp.md)
+  * [Pull Request Fee](assets/pr-fee.md)
 * [Deep Linking](deeplinking/deeplinking.md)
 * [Staking](platform/staking.md)
 * [Roadmap](roadmap/roadmap.md)

assets/add_new_asset.md

@@ -20,7 +20,7 @@ Token repository [https://github.com/trustwallet/assets](https://github.com/trus
 
 4. [coins](https://github.com/satoshilabs/slips/blob/master/slip-0044.md) integrated in [Wallet Core](https://developer.trustwallet.com/wallet-core)
 
-5. DApp images available in `Browser` section in Trust Wallet and at https://dapps.trustwallet.com and bookmarks icons. [read requirments](/assets/dapps)
+5. DApp images available in `Browser` section in Trust Wallet and at https://dapps.trustwallet.com and bookmarks icons. [read requirments](assets/add-dapp.md)
 
 6. Staking validators info available on [Trust Wallet Staking Platform](https://github.com/trustwallet/developer/blob/master/platform/staking.md)
 
@@ -33,6 +33,7 @@ Token repository [https://github.com/trustwallet/assets](https://github.com/trus
 1. Prepare image [requirements](#image-requirements)
 2. Get familiar with [folder strcture](#repository-structure), will give you understanding where asset image should be placed
 3. [Add asset guide](#how-to-add-asset)
+4. Pay a [Pull Reqest Fee](assets/pr-fee.md)
 
 ## Image Requirements
 - file extension: `png`. Uppercase `PNG` considered invalid.

assets/pr-fee.md

@@ -0,0 +1,63 @@
+# Pull Request Fee -- FAQ
+
+**Someone is asking for cypto payment for processing my Pull Request.  Is this a scam?**
+
+Always be cautious when someone asks you for payment.
+Check that there is a description about it under Trust Wallet Developers' doucmentation (this page).
+Check that the app is under the *trustwallet* github account, or that its owner belong to the trustwallet group.
+So no, this is not a scam.
+
+**Why?**
+
+Trust Wallet supports an insane number of tokens and coins.
+We are committed to supporting the tokens used by our users.
+But supporting so many assets has a high cost, in terms of running the infrastructure, ensuring continuous integrations,
+handling a massive number of requests to the assets info, etc. A lot of spam/scam coins also find us.
+
+We have introduced this crypto contribution in order to filter requests, so we have more time to handle genuine ones.
+
+We were partly insipred by [Token Curated Registry](https://medium.com/@tokencuratedregistry/a-simple-overview-of-token-curated-registries-84e2b7b19a06).
+
+**What do I have to pay attention to?**
+
+* Double check the [contribution guidelines](/add_new_asset), to minimize the risk of your PR being rejected.
+* Make sure to set the correct memo on your transfer.
+
+**How does a Fee fit with Open Source?**
+
+We believe in the power of open-source software, and essential parts of Trust Wallet are open source to contribute to the community
+([Wallet-Core](https://developer.trustwallet.com/wallet-core), [Blockatlas](https://developer.trustwallet.com/blockatlas)).
+But Trust Wallet is a branded product and running its backend infrastructure, support, marketing, etc. 
+Has costs (done by a non-volunteer based team).
+
+The `assets` repository is open source. You are free to use it and free to create your version (fork).  But we choose to ask for a contribution for requests to include/change the information in the Trust Wallet product.  See also *Why* question.
+
+**What is Trust Wallet Token TWT?**
+
+TWT is a token used in the
+[Referral Program](https://community.trustwallet.com/t/invite-a-friend-earn-trust-wallet-token-twt/4125).
+Currently, it is only possible to obtain it through referrals.  But if you are a token with a serious user base, getting a referral for ten new users should not be a problem.
+
+**When is my payment evaluated?**
+
+Payment is handled by [`merge-fee-bot`](https://github.com/settings/apps/merge-fee-bot), a GitHub app by us.
+Currently, payment is checked only when there is some action on the PR, such as a comment.
+So after your transfer, create a comment about it.  The payment should be detected within seconds.
+(Technical background: being notified when the payment happens is not a problem, but interacting with a PR
+when there is no action on it is difficult for the GitHub app.)
+
+**What happens after I pay?  Is merging automatic?**
+
+When the `merge-fee-bot` detects payment, it automatically places an Accept review on the PR.
+This is a precondition for merge.
+But merging is currently not automatic, it is done by the maintainers.
+
+**I have forgot to set a memo in my transfer**
+
+You know crypto, how transactions are final and irreversible.  We warned, provided QR code with memo, sorry.
+Pay again with correct memo.
+
+**If you decide not to merge my PR, do I get my payment back?**
+
+If a PR is rejected, it must have a reason.  Double check the contribution guide before paying.
+The fee is for processing a pull request, not necessarily merging it.