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feat: Spark L2 (#3715)

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Co-authored-by: blackcoffeexbt <87530449+blackcoffeexbt@users.noreply.github.com>
Co-authored-by: Vlad Stan <stan.v.vlad@gmail.com>
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Arc
2026-02-17 12:25:38 +01:00
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co-authored by blackcoffeexbt Vlad Stan
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commit 83ef05696e
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docs/guide/funding-sources-table.md
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@@ -50,6 +50,7 @@ Below is a side-by-side comparison of Lightning funding sources you can use with
| **Blink** | Custodial | ✅ | Low | ❌ | Low | Provider-managed | Easy | Low | Transaction fees apply | Medium | Third-party service; focuses on mobile integrations. |
| **ZBD** | Custodial | ✅ | Low | ❌ | Low | Provider-managed | Easy | Low | Transaction fees apply | Medium | Gaming-focused payment platform. |
| **Spark (CLN)** | Self-custodial | ❌ | Higher | ✅ | High | Manual | Moderate | High | Infrastructure cost and channel opening fees | High | Web interface for CLN; requires Spark server setup. |
| **Spark (L2)** | Self-custodial | ❌ | Medium | ❌ | Medium | Automatic | Easy | Low | Minimal fees | Medium | Runs via Spark sidecar; seed-based self-custody. |
| **Cliche Wallet** | Self-custodial | ❌ | Medium | ❌ | Medium | Manual | Moderate | Moderate | Minimal fees | Medium | Lightweight wallet; suitable for embedded systems. |
| **Strike** | Custodial | ✅ | Low | ❌ | Low | Provider-managed | Easy | Low | Transaction fees apply | Medium | Third-party service; suitable for quick setups. |
| **LNPay** | Custodial | ✅ | Low | ❌ | Low | Provider-managed | Easy | Low | Transaction fees apply | Medium | Third-party service; suitable for quick setups. |
@@ -57,7 +58,9 @@ Below is a side-by-side comparison of Lightning funding sources you can use with
| **LN.tips** | Custodial/Self-Custodial | Depends on provider | Medium | ❌ | Low | Provider-managed | Moderate | Low | Transaction fees may apply | Medium | Simple hosted service; use LN.tips API as your backend. |
| **Fake Wallet** | Testing (simulated) | ❌ | Low | ❌ | N/A | N/A | Easy | Low | None (test only) | N/A | For testing only; mints accounting units in LNbits (no real sats, unit name configurable). |
---
## Spark (L2)
Spark L2 uses a local Node.js sidecar to expose an HTTP API that LNbits can use as a funding source. It is self-custodial and secured by a standard mnemonic seed. You can let LNbits run the sidecar internally or run your own instance (see `https://github.com/lnbits/spark_sidecar`).
### Notes for readers