cross-l2

name	cross-l2
description	Cross-layer and cross-chain swap guidance for Bitcoin ecosystem assets. Use when the user wants to move BTC or RGB assets between Lightning Network, Spark, and on-chain Bitcoin, or asks about cross-L2 strategies. This skill provides step-by-step guidance; execution uses kaleidoswap and wallet-assistant skills. Requires kaleido-mcp.
license	Apache-2.0
metadata	{"author":"kaleidoswap","version":"1.0","networks":"bitcoin-lightning, bitcoin, spark, rgb"}

Cross-L2 Skill

You guide users through moving assets between Bitcoin layers:

• Bitcoin Lightning Network (LN)
• RGB Lightning (RGB assets on LN channels)
• Bitcoin on-chain
• Spark (a Bitcoin L2 using statechains/virtual UTXOs)

Available Paths

From	To	Method	Speed	Trust
BTC Lightning	USDT Lightning	Atomic swap (KaleidoSwap)	~15s	Trustless
BTC Lightning	BTC on-chain	Close channel / loop-out	Minutes–hours	Varies
USDT Lightning	USDT on-chain	Not directly available	N/A	N/A
BTC Spark	BTC Lightning	Spark → LN gateway (if available)	Minutes	LSP
BTC Spark	USDT Lightning	Spark → LN → KaleidoSwap	2 steps	Partial
BTC Lightning	BTC Spark	LN → Spark gateway	Minutes	LSP

Path 1: BTC Lightning → USDT (RGB) — Most Common

This is the core KaleidoSwap flow. Both assets stay on Lightning Network.

1. Get a quote: kaleidoswap_get_quote({ from: BTC/lightning, to: USDT/lightning })
2. Execute atomic swap (see kaleidoswap skill)
3. Receive USDT in your RGB channel

Result: USDT is now in your RLN Lightning channel, spendable via RGB invoices. Time: ~15–30 seconds Fee: Maker spread (~0.1–0.3%) + Lightning routing fee

Path 2: USDT (RGB) → BTC Lightning — Inverse

1. Quote: kaleidoswap_get_quote({ from: USDT/lightning, to: BTC/lightning })
2. Execute atomic swap
3. Receive BTC in your Lightning channel

Result: BTC in Lightning. Can be spent, withdrawn on-chain, or used for channel fees.

Path 3: BTC Lightning → BTC On-chain

KaleidoSwap does not currently offer loop-out (LN → on-chain). Options:

1. Close a channel: Use rln_list_channels() to find a channel, then ask the peer to cooperatively close. BTC returns on-chain. This is destructive — avoid unless necessary.

2. External loop-out service: Use a separate loop-out service (Lightning Loop, Boltz, etc.) if available. KaleidoSwap does not provide this natively.

3. Move BTC to Spark first: If your workflow ends at Spark, you may prefer keeping on Spark for cheaper on-chain interactions.

Advise the user accordingly. Do NOT promise on-chain withdrawal via KaleidoSwap.

Path 4: BTC Spark → USDT Lightning (2-step)

Spark is a Bitcoin L2 using virtual UTXOs (statechains). To get USDT on Lightning:

Step 1: Spark → Lightning (requires a Spark-LN bridge or gateway)
  - This step is external to KaleidoSwap
  - The user needs a Spark wallet with a bridge capability
  - Result: BTC arrives in a Lightning channel

Step 2: BTC Lightning → USDT (KaleidoSwap atomic swap)
  - Quote and execute as in Path 1 above

Note: Spark support in KaleidoSwap may evolve. Check kaleidoswap_get_pairs() for current supported layers.

Path 5: BTC Lightning → BTC Spark

Step 1: BTC Lightning → on-chain (via loop-out, if available)
Step 2: On-chain BTC → Spark (using a Spark deposit)

This is a 2-step process involving external services. KaleidoSwap facilitates step 1 (if loop-out is available) or advise the user on external tools.

How to Guide Users

When a user asks about cross-L2:

1. Ask what they have and where they want to end up. Example: "I have BTC on Spark and want USDT I can spend."
2. Identify the best path from the table above.
3. Explain the steps clearly — especially multi-step flows where external tools are needed.
4. Execute the KaleidoSwap-native steps using the kaleidoswap and wallet-assistant skills.
5. Advise on external steps clearly — do not pretend to handle them if they're outside KaleidoSwap.

Common User Questions

"Can I get USDT on-chain?" RGB USDT currently lives on Lightning Network channels, not on-chain Bitcoin. To get USDT on-chain (Ethereum/Tron), you would need a bridge to another network — this is out of scope for KaleidoSwap today.

"Is this cross-chain or cross-layer?" KaleidoSwap operates within the Bitcoin ecosystem (BTC L1 + Lightning L2 + RGB L2). It does not bridge to other blockchains (Ethereum, Solana, etc.).

"How fast are cross-L2 swaps?" Atomic swaps on Lightning complete in ~15–30 seconds. On-chain-touching flows (closing channels, Spark moves) take minutes to hours depending on mempool and block confirmation needs.

"What are the fees?"

• Atomic swap: ~0.1–0.3% maker spread + Lightning routing (~10–100 sats)
• Channel open/close: On-chain fee (varies with mempool)
• LSP channel buy: Fixed fee (~2,000–15,000 sats depending on size)