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Achievement: Pair ExtraordinaireAchievement: YOLOAchievement: Pull Shark

Achievements

Achievement: Pair ExtraordinaireAchievement: YOLOAchievement: Pull Shark

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Loop-XXI/README.md

LoopXXI

Systems that compound. LoopXXI builds and holds paid infrastructure for the agent economy — services that AI agents can discover, call, and pay for without accounts or API keys.

Live products

loop-mcp

L402-native MCP server. Agents pay 10–25 sats per tool call over Bitcoin Lightning, or use prepaid fiat credits via Stripe. Five live tools: Bitcoin price, send-or-wait fee decisions, Lightning Address resolution, transaction analysis, and send-window timing. Payment is the credential.

Loop Gateway

OpenAI-compatible API proxy that charges per prompt. Pay in sats over Lightning (L402) or preload fiat credits — no subscriptions, no accounts. 300+ models.

How agents pay

# Call a paid tool with no auth → HTTP 402 + a real Lightning invoice
curl -i https://mcp.loopxxi.com/l402/btc_price

# Pay the invoice in any Lightning wallet, retry with the preimage
curl -i https://mcp.loopxxi.com/l402/btc_price -H "Authorization: L402 <token>:<preimage>"

Contact

business@loopxxi.com · loopxxi.com

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