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mplementation Spike: Taproot Asset Token + L402 Payment Gate on FastAPI/Lightning
You are writing a technical implementation guide, not a market report. I need working architecture and code paths, not opinions.
I am building a local AI agent (Timmy) on FastAPI that accepts paid work requests over Lightning Network. The payment architecture:
1. User submits a request
2. A small non-refundable Lightning invoice (evaluation fee) must be paid before the agent reads the request
3. Agent evaluates the request using a cheap local model
4. If accepted, agent quotes a price and issues a second Lightning invoice
5. User pays, work is delivered
6. Optionally, users can prepay a session (batch of N requests) via a single invoice and receive a macaroon with a usage meter
I want to issue a custom Taproot Asset token (“TIMMY”) that represents one unit of the agent’s labor. This token should be transferable over Lightning channels instantly. The token is consumed on use — it is a labor credit, not an investment.
Research the following and provide concrete implementation details:
1. Taproot Asset Minting
∙ What are the exact steps to mint a custom fungible Taproot Asset on mainnet using tapd + LND?
∙ What version of LND is required? What flags/tags must be compiled?
∙ What does the gRPC call look like to mint? Provide the actual protobuf message or CLI command.
∙ What is the on-chain cost of the minting transaction?
∙ Can the entire supply be minted in a single transaction?
∙ How do you verify the asset was minted correctly?
2. Taproot Assets on Lightning Channels
∙ How do you deposit a Taproot Asset into a Lightning channel?
∙ Can a Taproot Asset channel coexist alongside a BTC channel in the same UTXO?
∙ How does routing work — can a TIMMY token payment route over existing BTC Lightning channels via edge nodes, or does it require dedicated Taproot Asset channels end-to-end?
∙ What happens if no direct Taproot Asset route exists — does the protocol fall back to BTC conversion at edge nodes?
∙ What is the current state of Taproot Asset channel support in LND (v0.20+)?
3. L402 Payment Gate with Taproot Assets
∙ Can Aperture (Lightning Labs’ L402 reverse proxy) gate access using Taproot Asset payments, or only BTC sats?
∙ If Aperture only supports sats, what is the minimum custom code needed to accept Taproot Asset payments as L402 credentials?
∙ How would a macaroon encode that payment was made in TIMMY tokens vs. sats?
∙ Is there a way to implement the “session pass” pattern (prepay N requests, get a metered macaroon) using Taproot Assets?
4. FastAPI Integration
∙ What is the most production-ready Python path to interact with tapd (Taproot Assets daemon)? gRPC stubs? REST? LNbits extension?
∙ Does LNbits support Taproot Assets as of March 2026?
∙ Provide a minimal FastAPI endpoint that: creates a Taproot Asset invoice, checks payment status, and issues a macaroon on confirmation.
∙ How do you query a user’s TIMMY token balance programmatically?
5. Hybrid Architecture: Sats + TIMMY Token
∙ If Taproot Asset Lightning support is not yet production-ready, what is the cleanest hybrid? Users pay in sats via standard Lightning, but the internal ledger tracks TIMMY credits?
∙ How do you peg TIMMY credits to sats? Fixed rate set by operator, or floating based on demand?
∙ When Taproot Asset channels mature, what is the migration path from the hybrid model to native token payments?
6. What Breaks
∙ What are the known failure modes of Taproot Assets on Lightning as of March 2026?
∙ What is NOT yet implemented in tapd that this design requires?
∙ Are there any mainnet Taproot Asset channels in production, or is this still testnet-only for asset channels?
∙ What is the risk of building on Taproot Assets today given the protocol is still evolving?
Deliverable: A structured implementation guide with exact commands, library versions, gRPC/REST call examples, and a clear flag on anything that is not yet production-ready. Prioritize what works today over what is promised. If something requires waiting, say so and provide the interim workaround