Add AlgoVoi multi-chain payment gateway

[chopmob-cloud]

Adds AlgoVoi to the Projects Building on Stellar section.

Stellar integration

AlgoVoi accepts on-chain USDC on Stellar via the Circle-issued asset (`USDC:GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN`). Stellar is a first-class chain on the facilitator — not an afterthought. Notable Stellar-specific design choices:

• Short-memo binding — each payment link stores a memo_note_prefix of the form `av:{token[:20]}` designed to fit Stellar's MEMO_TEXT 28-byte limit. Most memo-based binding implementations for multi-chain gateways forget this constraint; AlgoVoi handles it in the link-creation path.
• Credit-asset support — handles the compound `CODE:ISSUER` asset identifier natively, including path_payment and fee-bump verification.
• SEP-friendly — verifier uses the public Horizon endpoint; no private anchor infrastructure required. Merchants can accept XLM or any SEP-24 credit asset.

Broader context

AlgoVoi is multi-chain (Algorand, VOI, Hedera, Stellar, Base, Solana, Tempo) so merchants don't pick just one network; all 7 can be offered on the same hosted checkout with automatic routing by tenant preference. Agents can pay via Coinbase x402, IETF MPP, or Google AP2 — all three at the same URL.

Live references

• Agent card: https://api1.ilovechicken.co.uk/.well-known/agent.json
• Hosted checkout sample: https://api1.ilovechicken.co.uk/checkout/
• Open-source MCP adapter + eCommerce plugins: https://github.com/chopmob-cloud/AlgoVoi-Platform-Adapters

Scope of change

Single-line addition to `Projects Building on Stellar`. No other sections touched.

[Copilot]

Pull request overview

Adds AlgoVoi to the “Projects Building on Stellar” section of the README.

Changes:

• Add a new “AlgoVoi” entry under “Projects Building on Stellar”.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The memo binding format in this entry (av:{token}) doesn’t match the PR description’s stated av:{token[:20]} truncation to ensure it fits Stellar’s 28-byte MEMO_TEXT limit. Please align the README wording with the actual on-chain format (including any truncation/encoding rules) to avoid misleading integrators.

[Copilot]

This list item is substantially longer and more marketing-dense than the surrounding entries in this section, which are generally 1–2 concise sentences. Consider trimming to a short description focused on Stellar relevance (and optionally a single link), to keep the directory scannable and consistent with nearby items (e.g., README.md:307–347).

Suggested change

- [AlgoVoi](https://algovoi.co.uk/) - Multi-chain, multi-protocol crypto payment gateway. Accepts USDC on Stellar via Circle-issued assets with SEP-friendly memo binding (`av:{token}` short-memo format to fit MEMO_TEXT's 28-byte limit). Also spans Algorand, VOI, Hedera, Base, Solana, and Tempo on a single endpoint. Implements Coinbase x402, IETF MPP, and Google AP2 agent-commerce protocols. Hosted checkout pages + on-chain verification + open-source adapters for 17+ eCommerce platforms.

- [AlgoVoi](https://algovoi.co.uk/) - Crypto payment gateway supporting USDC on Stellar with SEP-friendly memo binding.

[chopmob-cloud]

Thanks for the review @copilot-pull-request-reviewer — both points addressed in 71e77e8:

1. Trimmed the entry to a single sentence matching the brevity of surrounding listings (Skyhitz, Tangem, etc.)
2. Aligned the memo format to av:{token[:20]} to reflect the actual on-chain truncation rule (3 prefix bytes + 20 token bytes = 23 bytes, safely under the 28-byte MEMO_TEXT limit)

Happy to trim further if it's still too long for the section.

[chopmob-cloud]

Quick milestone update — fresh today (2026-05-05):

xChain mainnet for Stellar shipped. EVM USDC (Base, Arbitrum, Polygon, Optimism, Ethereum, BNB, Avalanche) settles to canonical Stellar USDC (Circle issuer GA5ZSEJ…) on the merchant's G… address in ~60–120s end-to-end. Allbridge Core's swap-and-bridge route invokes a Soroban swap pool that auto-converts so the merchant receives the classic Circle asset directly — no Soroban-aware wallet required, any Stellar wallet works. First mainnet bridge settled cleanly.

Backing this in the AlgoVoi listing makes Stellar the third destination (alongside Algorand and Solana) reachable from MetaMask without the user installing a Stellar wallet. CCTP V2 will be added as a second protocol on the same pipeline once Circle ships Stellar mainnet contracts publicly.

Listing edits already addressed both review points (71e77e8) — happy to land whenever the maintainer team has a moment.