DIP-64: Universal Checkout for Devcon[nect]

.github/pull_request_template.md

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    * [ ] Authors
    * [ ] Resources Required (optional)
    * [ ] Discussion (with link to devcon forum)
-   * [ ] Created (in the format year-month-day e.g 2020-4-20)
+   * [ ] Created (in the format year-month-day e.g 2020-04-20)
  * [ ] contains these sections:
    * [ ] Abstract
    * [ ] Rationale

DIPs/DIP-64.md

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+---
+DIP: 64
+Title: Universal Checkout for Devcon[nect]
+Status: Draft
+Themes: Ticketing, Payments
+Tags: Software, Payments
+Instances: Devconnect2025
+Authors: dc@daimo.com
+Resources Required: Tech support, Communication support
+Discussion: https://forum.devcon.org/t/dip-64-universal-checkout-for-devcon-nect/5346
+Created: 2025-02-14
+---
+
+## Abstract
+
+Use an updated Pretix payments plugin for streamlined ticket purchases on Ethereum. This plugin uses Daimo Pay for any-chain checkout and Peanut Protocol for refunds.
+
+## Rationale
+
+### Background
+
+Devcon[nect] uses Pretix for ticketing, along with the `pretix-eth-payment-plugin` to accept Ethereum payments.
+
+This plugin has gone through many iterations, most recently using 3cities for Devcon 7; see [DIP-37](https://github.com/efdevcon/DIPs/blob/master/DIPs/DIP-37.md). However, 3cities has been discontinued, so we need a new solution.
+
+Meanwhile, Ethereum is rapidly improving. We have one-cent, one-second transactions. Stablecoins are a key instrument of global permissionless commerce. Friction between the growing set of apps, chains, and coins remains a challenge.
+
+We've built Daimo Pay, an open source SDK to accept any chain on any coin. We would like to integrate Daimo Pay into Pretix to provide universal checkout for Devcon[nect].
+
+Our goals for this proposal are twofold:
+
+- Make it as easy as possible for attendees to buy a ticket. In our ideal world, everyone attending Devconnect this year would buy a ticket on Ethereum rather than fiat rails.
+- Raise the bar for real-world Ethereum UX.
+
+Finally, we want to provide a system that's simple and operationally robust for event organizers.
+
+## Implementation
+
+In the spirit of "rough consensus and running code," we've built a prototype Pretix integration. [See the code here.](https://github.com/daimo-eth/pretix-eth-payment-plugin/)
+
+Visual demo: [Pretix x Daimo Pay Integration](https://www.loom.com/share/8c71876a9d5348f6a07a8d7e687368b6?sid=5b19c2a2-7502-4cf2-9afe-a865fd04e003)
+
+The [Daimo Pay SDK and contracts](https://github.com/daimo-eth/paykit) are open source under BSD and GPLv3, respectively.
+
+Pay uses Intent Addresses to accept payment from any chain, non-custodially, in a single transfer. This allows for a clean user experience that's also operationally clean for organizers. Funds arrive immediately in a single rollup address, no manual collecting and swapping required.
+
+The underlying intent contracts ensure that any funds sent to a CREATE2 intent address will be swapped, bridged, and forwarded correctly to a specific destination. For bridging, the contracts rely on a combination of CCTP, Across and Axelar.
+
+Pay supports all liquid tokens on major EVM bytecode-compatible rollups, plus Polygon. Users can also pay directly from custodial apps including Coinbase and Binance.
+
+We want to offer a faster and more widely compatible on-chain payment flow than any past Devcon. Our mission is an Ethereum-native checkout that meets or exceeds the experience set by fiat checkouts like Apple Pay or Google Pay. Ethereum is a universal settlement system, so people should be able to pay from anywhere.
+
+## Operational Requirements & Ownership
+
+### Deliverables
+
+Daimo will deliver:
+
+- A fully integrated, open source Pretix plugin. [See our Github repo.](https://github.com/daimo-eth/pretix-eth-payment-plugin/)
+- Engineering support for setup, validation, and testing
+- Technical support before and during the event
+- Built-in support for refunds using the open source [Peanut Protocol](https://docs.peanut.to/how-to-use-peanut-links/how-do-peanut-links-work)
+
+### Cost
+
+#### Free for users
+
+The goal-state Ethereum checkout is precisely 1:1 for stablecoin payments.
+
+For example, if an item costs $100, then you can pay in a stablecoin such as DAI, USDC or USDT on any rollup by transferring exactly $100.00. Swapping, bridging and associated gas costs are paid by the merchant. This is much less than the ~3% merchants pay on fiat checkout, illustrating Ethereum's superior properties as a substrate for commerce. Users get a clean, 1:1 experience.
+
+Paying from L1 is not 1:1 --- the gas can be far higher, in some cases $5+. Thus, paying a $100 checkout might cost $105 DAI on L1.
+
+The future of Ethereum is rollups. Daimo Pay supports a wide range of chains including L1 (and, optionally at Devcon's discretion, even Bitcoin and Solana), but the destination is always an Ethereum L2 and the system is optimized for goal-state UX when paying from L2.
+
+#### Flat rate for Devcon
+
+Daimo Pay charges 1% on payments. This covers integration, running fast relayers, and all swap/bridge/gas costs described above.
+
+There will be no additional costs. Engineering and technical support are included for free.
+
+### Timeline
+
+We can have a production-ready plugin ready this month (February 2025). We have an end-to-end working prototype already. See repo above.
+
+We're integrating our plugin with other events using Pretix for ticketing. This will ensure production test mileage ahead of the Devconnect ticket launch.
+
+## Conclusion
+
+If this collaboration is successful, we will see:
+
+- A delightful and robust ticketing system for Devconnect
+- A clean and operationally smooth payment solution for future Devcons
+- Proven success, freeing future events to run entirely on-chain
+
+### Links and additional information
+
+Pretix website https://pretix.eu/about/en/
+
+Previous payment plugin https://github.com/FreePay/pretix-eth-payment-plugin/tree/switch-to-3cities
+
+Prototype Daimo Pay plugin https://github.com/daimo-eth/pretix-eth-payment-plugin
+
+Daimo Pay https://pay.daimo.com
+
+Daimo Pay SDK codebase https://github.com/daimo-eth/paykit
+
+Intent Addresses https://hackmd.io/j80aijVIQCuaLZkQefoVoA