# acm-500.ai — ACM-500 · SYSTEM_ERROR
Canonical: https://acm-500.ai/llms.txt

Doors by what they resolve:
- GTINs → https://gtinfetch.ai/mcp
- Listed issuers (ticker, ISIN, LEI) → https://mcp.getissuer.ai/mcp
- Receipts — the Record of Cleared Orders → https://mcp.rco-a2a.ai/mcp

ACM-500 · SYSTEM_ERROR · Retry or fallback. — one of the seven canonical signals of ACM-68000 (https://acm-68000.org/; Agentic KG Holdings, reference operator, MIT).
Listed issuers (Allooloo Technologies Corp., operator of this page): definition — The home market's node did not answer: retry. No record is served from another store, so there is no fallback record.
Resolver: https://mcp.getissuer.ai/mcp — get_signal(identifier) returns the signal live.
CPG application profile (GreenCore Solutions Corp.): https://cpg-500.ai/
The seven: https://acm-000.ai/ · https://acm-200.ai/ · https://acm-300.ai/ · https://acm-403.ai/ · https://acm-404.ai/ · https://acm-451.ai/ · https://acm-500.ai/
Machine surfaces: /signal.json · /signals.json · /connect.json · /nodes.json · /health.json · /dataset.jsonld · /.well-known/agent-card.json · /.well-known/mcp.json · /.well-known/api-catalog · /.well-known/ai-catalog.json
Allooloo Technologies Corp. operates this page from 2026-10-24 (company records line ACM-SIGNALS-01).