Add Codex third-party docs quickstart

[Nealo]

Summary

• Adds a quickstart page for Codex under docs/for-devs/third-party-docs/Codex/codex.mdx
• Codex is a blockchain data API providing real-time and historical DeFi data across 100+ networks via GraphQL

PR questions

1. Audience: Arbitrum developers looking for blockchain data APIs (token prices, DEX trades, wallet analytics)
2. Problem: They need access to real-time and historical DeFi data on Arbitrum for building trading bots, portfolio trackers, token explorers, and dashboards
3. Discovery: Searching for "Arbitrum data API", "Arbitrum token prices API", "Arbitrum DEX data", "blockchain data GraphQL"
4. Document type: Quickstart
5. Policy acknowledgment: Yes, I agree to the third-party content policy outlined within "Contribute docs"

[vercel]

@Nealo is attempting to deploy a commit to the Offchain Labs - AF Billed Team on Vercel.

A member of the Team first needs to authorize it.

[CLAassistant]

All committers have signed the CLA.

[pete-vielhaber]

To include your content your project needs to be validated. To do that, you need to submit your project to Arbitrum portal by filling out this form).

[Nealo]

Thanks Pete. I started going through it and discovered that the form asks for where the project is deployed and smart contract addresses. We don't have a token or a smart contract as we're a blockchain indexer + data API that indexes all Arbitrum token and wallet transactions (as well as 100+ other chains). Coinbase, Rainbow, etc are customers. If being a decentralized app deployed on Arbitrum is a requirement, let me know :) Sent via Superhuman ( https://superhuman.com/refer/gt43cx4l?utm_medium=signature&utm_source=product )

…

On Fri, Feb 27, 2026 at 12:51 PM, Pete < ***@***.*** > wrote: *pete-vielhaber* left a comment (OffchainLabs/ arbitrum-docs#3138) ( #3138 (comment) ) To include your content your project needs to be validated. To do that, you need to submit your project to Arbitrum portal ( https://portal.arbitrum.io/ ) by filling out this form ( https://forms.gle/Vzzz39VLakHJ57ib7 ) ). — Reply to this email directly, view it on GitHub ( #3138 (comment) ) , or unsubscribe ( https://github.com/notifications/unsubscribe-auth/AAYXLMYNMZLLAKISOZYEIOT4OCU3NAVCNFSM6AAAAACWCEO7S6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTSNZVGAZTEMZYGI ). You are receiving this because you were mentioned. Message ID: <OffchainLabs/arbitrum-docs/pull/3138/c3975032382 @ github. com>

[Jason-W123]

Thanks Pete. I started going through it and discovered that the form asks for where the project is deployed and smart contract addresses. We don't have a token or a smart contract as we're a blockchain indexer + data API that indexes all Arbitrum token and wallet transactions (as well as 100+ other chains). Coinbase, Rainbow, etc are customers. If being a decentralized app deployed on Arbitrum is a requirement, let me know :) Sent via Superhuman ( https://superhuman.com/refer/gt43cx4l?utm_medium=signature&utm_source=product )
…
On Fri, Feb 27, 2026 at 12:51 PM, Pete < @.*** > wrote: pete-vielhaber left a comment (OffchainLabs/ arbitrum-docs#3138) ( #3138 (comment) ) To include your content your project needs to be validated. To do that, you need to submit your project to Arbitrum portal ( https://portal.arbitrum.io/ ) by filling out this form ( https://forms.gle/Vzzz39VLakHJ57ib7 ) ). — Reply to this email directly, view it on GitHub ( #3138 (comment) ) , or unsubscribe ( https://github.com/notifications/unsubscribe-auth/AAYXLMYNMZLLAKISOZYEIOT4OCU3NAVCNFSM6AAAAACWCEO7S6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTSNZVGAZTEMZYGI ). You are receiving this because you were mentioned. Message ID: </pull/3138/c3975032382 @ github. com>

Hey, Nealo
We notice that it is not reasonable to have this question (contract address related qs) for infra team like yours, we will change the form and let you know once we done.

[Jason-W123]

We just set that question as optional, @Nealo

[Nealo]

Awesome, appreciate you doing that, Jason!

I just filled out and submitted the form. Let me know if you have any questions or if I did anything wrong on it