docs: remove references to deprecated gasless-approval-tokens endpoint

fern/docs/pages/gasless-api/guides/get-started-with-gasless-api.mdx

@@ -461,7 +461,7 @@ If liquidity is available, 2 objects may be returned:
 - `approval`: This is the “approval” object which contains the necessary information to process a gasless approval. See the [quote response](/api-reference/evm-ap-is/gasless/getquote#option-1) for an example.
   - If a gasless approval is possible, this object includes all the required information to process it.
   - If a gasless approval is **not** possible, this object will be `null`, and you must use the [standard approval flow](/evm/gasless-api/guides/understanding-gasless-api#technical-flow-charts) to [set a token allowance](/evm/0x-swap-api/additional-topics/how-to-set-your-token-allowances). NEVER SET AN ALLOWANCE ON THE SETTLER CONTRACT.
-  - You can also see all the token addresses that support gasless approvals with the [`/gasless-approval-tokens`](/api-reference/evm-ap-is/gasless/getgaslessapprovaltokens) endpoint.
+  - Gasless approvals work only for tokens that support [EIP-2612](https://eips.ethereum.org/EIPS/eip-2612). Check the `approval` object in the [quote](https://docs.0x.org/api-reference/evm-ap-is/gasless/getquote) response — if it's not `null`, gasless approval is available for that token.
 
 - `trade`: This is the "trade" object which contains the necessary information to process a gasless trade. See the quote response [here](/api-reference#tag/Gasless/operation/gasless::getQuote).
 
@@ -558,8 +558,8 @@ Once the trade is successful, you can display the transaction confirmation to yo
 
 ## Gasless Approval Tokens
 
-Use [`/gasless/gasless-approval-tokens`](/api-reference/evm-ap-is/gasless/getgaslessapprovaltokens) to get token addresses that support gasless approvals on each chain.
+Gasless approvals work only for tokens that support [EIP-2612](https://eips.ethereum.org/EIPS/eip-2612). Check the `approval` object in the [quote](https://docs.0x.org/api-reference/evm-ap-is/gasless/getquote) response — if it's not `null`, gasless approval is available for that token.
 
 ## Gasless Chains
 
-Use [`/gasless/chains`](/api-reference/evm-ap-is/gasless/getgaslessapprovaltokens) to get a list of supported chains for gasless.
+Use [`/gasless/chains`](/api-reference/evm-ap-is/gasless/getchains) to get a list of supported chains for gasless.

fern/docs/pages/gasless-api/understanding-gasless-api.mdx

@@ -41,7 +41,7 @@ Once these steps are complete, the Gasless API will execute the transaction with
 
 Gasless API provides a gasless experience at two points of the trade experience where the user normally needs to pay gas:
 
-- **Gasless approvals** work only for tokens listed in our [Gasless Approval Token endpoint](https://docs.0x.org/api-reference/evm-ap-is/gasless/getgaslessapprovaltokens). These are tokens that support [EIP-2612](https://eips.ethereum.org/EIPS/eip-2612).
+- **Gasless approvals** work only for tokens that support [EIP-2612](https://eips.ethereum.org/EIPS/eip-2612). Check the `approval` object in the [quote](https://docs.0x.org/api-reference/evm-ap-is/gasless/getquote) response — if it's not `null`, gasless approval is available for that token.
 
 - **Gasless swaps** work for selling any non‑native token (anything that’s an ERC‑20 or similar).
 

fern/docs/pages/introduction/faq.mdx

@@ -445,7 +445,7 @@ Read more about the contracts [here](/docs/core-concepts/contracts).
 
     Gasless API provides a gasless experience at two points of the trade flow where users normally pay gas:
     <ul>
-        <li><strong>Gasless approvals</strong> work only for tokens listed in our <a href="/api-reference/evm-ap-is/gasless/getgaslessapprovaltokens">Gasless Approval Token endpoint</a> (tokens that support <a href="https://eips.ethereum.org/EIPS/eip-2612">EIP-2612</a>).</li>
+        <li><strong>Gasless approvals</strong> work only for tokens that support <a href="https://eips.ethereum.org/EIPS/eip-2612">EIP-2612</a>. Check the <code>approval</code> object in the <a href="/api-reference/evm-ap-is/gasless/getquote">quote</a> response — if it's not <code>null</code>, gasless approval is available for that token.</li>
         <li><strong>Gasless swaps</strong> work for selling any non-native token (ERC-20 or similar).</li>
     </ul>
 
@@ -537,9 +537,11 @@ https://api.0x.org/gasless/quote                          # Request a firm quote
 <AccordionGroup>
 
 <Accordion title="What tokens work with gasless approvals?">
-  Gasless approvals are supported only for tokens listed in the [gasless
-  approval token
-  endpoint](https://docs.0x.org/api-reference/evm-ap-is/gasless/getgaslessapprovaltokens).
+  Gasless approvals work only for tokens that implement
+  [EIP-2612](https://eips.ethereum.org/EIPS/eip-2612) (`permit`). Check the
+  `approval` object in the
+  [quote](https://docs.0x.org/api-reference/evm-ap-is/gasless/getquote) — if
+  it's not `null`, the token supports gasless approval.
 </Accordion>
 
 <Accordion title="How do I know if an approval is required?">

fern/docs/pages/upgrading/upgrading-to-gasless-v2.mdx

@@ -427,7 +427,7 @@ With the introduction of the `issues.allowance` field in Gasless API v2, some fi
 
 ### Standard Token Approval Flow
 
-In v2, for [tokens that do not support gasless approvals](/api-reference/evm-ap-is/gasless/getgaslessapprovaltokens), use the [standard token approval flow](/evm/0x-swap-api/additional-topics/how-to-set-your-token-allowances).
+In v2, for tokens that do not support gasless approvals (i.e. `approval` is `null` in the quote response), use the [standard token approval flow](/evm/0x-swap-api/additional-topics/how-to-set-your-token-allowances).
 
 <Warning>
 When using the [Standard Approval Flow](/evm/0x-swap-api/additional-topics/how-to-set-your-token-allowances) (aka Gasless Approvals are not supported)