{ "schema_version": "2.4", "provider": { "name": "Loop XXI", "legal_name": "Loop XXI LLC", "website": "https://loopxxi.com", "contact": "business@loopxxi.com", "description": "Loop XXI builds infrastructure for autonomous commerce on Bitcoin and Lightning rails, and publishes research and public packages." }, "updated": "2026-10-08", "catalog_url": "https://loopxxi.com/products.json", "products": [ { "id": "loop-gateway", "name": "Loop Gateway", "status": "under-review", "purchasing": { "open": true, "status": "open", "since": "2026-10-08", "reason": "Loop XXI paid both rails on production with its own Lightning wallet on 2026-10-08: a 5,000-sat prepaid top-up settled and served a chat completion, and a 1-sat L402 challenge was paid, redeemed once and refused on replay.", "instruction": "Check this field before paying. If it reports open: false, do not create a top-up invoice or pay an L402 challenge." }, "kind": "api", "audience": [ "agent", "human" ], "operator": "Loop XXI LLC", "contact": "business@loopxxi.com", "support": [ "business@loopxxi.com" ], "description": "OpenAI-compatible, metered AI inference operated by Loop XXI. Preferred purchase is prepaid Bitcoin Lightning top-up: POST /v1/topup with amount_sats (min 5000 sats) \u2192 pay BOLT11 \u2192 use loop_ bearer. Humans top up at https://gateway.loopxxi.com/buy. Per-call L402 is advertised as available: unauthenticated POST /v1/chat/completions returns HTTP 402 L402. Paying that challenge with the published BoltHub L402Client was verified on production on 2026-10-08 by Loop XXI's own wallet; lnget is not yet tested. Credit pays for API usage only; Loop XXI does not take custody of customer wallets.", "one_line": "Prepaid sats credit for OpenAI-compatible inference. POST /v1/topup, pay BOLT11, use loop_ bearer.", "api_base": "https://api.loopxxi.com/v1", "endpoint": "https://api.loopxxi.com/v1", "inference_url": "https://api.loopxxi.com/v1/chat/completions", "details_url": "https://loopxxi.com/businesses", "purchase_url": "https://gateway.loopxxi.com/buy", "health_url": "https://api.loopxxi.com/health", "docs_url": "https://api.loopxxi.com/llms.txt", "discovery_example_url": "https://loopxxi.com/tools/gateway-discovery", "quickstart_url": "https://loopxxi.com/businesses#quickstart", "openapi_url": "https://loopxxi.com/openapi/gateway.json", "payment_discovery_url": "https://api.loopxxi.com/.well-known/agent-payments.json", "pricing_url": "https://api.loopxxi.com/v1/pricing", "models_url": "https://api.loopxxi.com/v1/models", "balance_url": "https://api.loopxxi.com/v1/balance", "pricing": { "type": "metered", "unit": "sat", "pointer": "https://api.loopxxi.com/v1/pricing", "requires_subscription": false, "basis": "Current model prices at GET /v1/pricing. Do not cache a price or model count." }, "payment_rails": [ { "id": "lightning-topup", "name": "Bitcoin Lightning top-up", "method": "POST", "url": "https://api.loopxxi.com/v1/topup", "content_type": "application/json", "example_body": { "amount_sats": 5000 }, "min_amount_sats": 5000, "returns": "BOLT11 invoice and a prepaid loop_ bearer token. Pay the invoice from a Bitcoin Lightning wallet you control, then call the API with Authorization: Bearer .", "flow": "POST /v1/topup with amount_sats \u2192 pay BOLT11 \u2192 use loop_ bearer", "style": "NWC / Alby Hub prepaid invoice then bearer", "analogy": "BoltHub buyCredit: Gateway topup is prepaid sats credit for OpenAI-compatible inference.", "primary": true }, { "id": "l402", "name": "L402", "method": "POST", "url": "https://api.loopxxi.com/v1/chat/completions", "available": true, "min_amount_sats": 1, "tools": [ "lnget", "L402" ], "challenge": "Unauthenticated POST /v1/chat/completions returns HTTP 402 with WWW-Authenticate: L402 (macaroon and Lightning invoice).", "note": "Unauthenticated POST /v1/chat/completions returns an HTTP 402 L402 challenge. Challenge amount is the estimated request cost (minimum 1 sat). Paying it with the published BoltHub L402Client was verified on production on 2026-10-08 by Loop XXI's own wallet; lnget is not yet tested. Preferred first purchase is still prepaid POST /v1/topup (min 5000 sats).", "preferred": false, "primary": false } ], "agent_purchase": { "job_to_be_done": "Buy OpenAI-compatible inference with prepaid Bitcoin sats.", "preferred": "prepaid-topup", "support": "business@loopxxi.com", "prepaid": { "style": "NWC / Alby Hub prepaid invoice then bearer", "flow": "POST /v1/topup with amount_sats \u2192 pay BOLT11 \u2192 use loop_ bearer", "method": "POST", "url": "https://api.loopxxi.com/v1/topup", "example_body": { "amount_sats": 5000 }, "min_amount_sats": 5000, "analogy": "BoltHub buyCredit: Gateway topup is prepaid sats credit for OpenAI-compatible inference. Usage credit only; not custody of a customer wallet." }, "l402": { "available": true, "tools": [ "lnget", "L402" ], "url": "https://api.loopxxi.com/v1/chat/completions", "min_amount_sats": 1, "challenge": "Unauthenticated POST /v1/chat/completions returns HTTP 402 with WWW-Authenticate: L402 (macaroon and Lightning invoice).", "note": "Per-call L402 is advertised as available. Paying the challenge with the published BoltHub L402Client was verified on production on 2026-10-08 by Loop XXI's own wallet; lnget is not yet tested. Preferred first purchase is still prepaid Lightning top-up (POST /v1/topup, min 5000 sats) or the human purchase page https://gateway.loopxxi.com/buy." } }, "payment_discovery": { "lightning": { "method": "POST", "url": "https://api.loopxxi.com/v1/topup", "min_amount_sats": 5000, "preferred": true, "note": "Prepaid Lightning credit. POST /v1/topup with amount_sats (min 5000). Pay BOLT11, then use loop_ bearer." }, "l402": { "available": true, "method": "POST", "url": "https://api.loopxxi.com/v1/chat/completions", "min_amount_sats": 1, "preferred": false, "note": "Unauthenticated POST /v1/chat/completions returns HTTP 402 L402. Paying that challenge with the published BoltHub L402Client was verified on production on 2026-10-08 by Loop XXI's own wallet; lnget is not yet tested. Preferred first purchase is still prepaid POST /v1/topup (min 5000 sats)." }, "stripe": { "available": false, "method": "GET", "url": "https://api.loopxxi.com/v1/credits/packs", "note": "Unavailable per live payment discovery: card checkout to credited balance is not verified end-to-end. This catalog does not create a new Stripe product. Use prepaid Lightning POST /v1/topup." }, "x402": { "available": false, "method": "GET", "url": "https://api.loopxxi.com/v1/x402/payment-required", "note": "Optional USDC wallet rail. Unavailable per live payment discovery: settlement is not configured and the URL returns HTTP 503. Do not send funds to an address inferred from memory. Use prepaid Lightning POST /v1/topup." } }, "requires_subscription": false, "delivery": "Documented prepaid inference flow; independent live paid end-to-end delivery remains unverified.", "safety": "Non-custodial of customer wallets. Prepaid bearer credit only. Keep tokens private. Never send seeds, operator macaroons, or Stripe secret keys to Loop XXI.", "status_note": "Under review as of 2026-10-08. Buying is open. Loop XXI paid both rails on production with its own Lightning wallet on 2026-10-08: a 5,000-sat prepaid top-up settled and served a chat completion, and a 1-sat L402 challenge was paid, redeemed once and refused on replay. Independent live paid end-to-end operation and external customer revenue remain unverified. Public API documentation is not a commercial readiness guarantee." } ], "notice": "Gateway is under review. Independent live paid end-to-end operation and external customer revenue remain unverified. Read the dated public record at https://loopxxi.com/updates. Other human offers remain paused; historical downloads do not indicate an active paid service. Loop Scope is an unpaid experiment; payment is not open for the auditor API.", "toolkits": [] }