Choosing between products? Loop Pick does the research for you. One recommendation, one alternative, direct sources, honest tradeoffs. $10 by card or 21% less in Bitcoin. loopxxi.com/pick

Loop Chat is live. Private AI chat in your browser, running on open models. No account, no subscription. Buy credits once and pay per token. Card or Lightning, and Lightning saves 21%. loopxxi.com/chat

The LoopXXI site got a full redesign. Four product lines: consumer AI, agent tools, evidence, and data sovereignty. Every product has a clear price and a Bitcoin path. loopxxi.com

LoopXXI is building software for people and agents with a shared Vault layer. Keep an encrypted, user-controlled copy of the data each app creates, then choose what to export or sell. Notes and AI Chat are live. Sales are simulated. https://loopxxi.com/vault

LoopXXI Vault is opening three buyer integration pilot slots.

Starting at $149, AI, research, and data teams get a synthetic encrypted capsule, attestation verification, buyer-local decryption guidance, and an evidence packet.

https://loopxxi.com/vault/pilot

Evidence Report 001 is live.

We tested our own L402 route and signed the exact observation: valid 402, 10-sat price, no payment attempted.

A challenge is not settlement.

Read it or check your own route free:
https://loopxxi.com/evidence

Three ways to buy from LoopXXI:

Revenue Readiness Audit: $149 for evidence showing where a paid API loses revenue.
AI API credits: from $10.
Agent tools: 10–25 sats per call.

Choose, pay, get the result:
https://loopxxi.com

Agent-callable Bitcoin tools now have a machine-readable L402 manifest.

Discover:
https://mcp.loopxxi.com/.well-known/l402-manifest.json

Pay per request:
• BTC price: 10 sats
• send-or-wait decision: 15 sats
• optimal send window: 25 sats

No account. No API key. The 402 response returns a BOLT11 invoice; pay it, then retry with the L402 token + preimage.

Built for autonomous buyers.

Use case for loop-mcp: give agents a paid Bitcoin/Lightning toolkit.

Agents can check BTC price, decide send-now vs wait from mempool fees, resolve Lightning addresses, decode txs, and pick cheaper send windows.

Pay per call via L402 or Stripe credits: https://mcp.loopxxi.com

loop-mcp is now listed on Smithery.

Point any MCP client at mcp.loopxxi.com/mcp and your agent pays per tool call — 10-25 sats over Lightning (L402), or prepaid fiat credits. No API keys. Payment is the credential.

Five live tools: btc_price, btc_send_decision, lightning_address_resolve, tx_decode_explain, optimal_send_window.

Try the full paid flow in your browser: https://loop-xxi.github.io/loop-mcp/example/playground/

Smithery: https://smithery.ai/server/business-yukr/loop-mcp

If the mechanism is real, time becomes part of the work. We favor systems that improve with each pass. https://loopxxi.com

Two products live now, both metered by protocol instead of accounts.

Loop Gateway: 300+ AI models through one endpoint.
loop-mcp: any tool call gated by a Lightning invoice.

Pay per request in sats or fiat. No signup. https://loopxxi.com