ACM-68000 · Seven Canonical Signals

ACM-500 · SYSTEM_ERRORacm-500.ai

STANDARD: SYSTEM_ERROR

LISTED ISSUERS: DEFINITION

ACM-500 · SYSTEM_ERROR · Retry or fallback.

Definition — the standard

ACM-500 is one of the seven canonical signals of ACM-68000. State: SYSTEM_ERROR. Action: Retry or fallback. The standard is held by Agentic KG Holdings (the Agentic Private Office) as reference operator under the MIT licence, and implemented by any company's doors: acm-68000.org.

Listed issuers — Allooloo Technologies Corp., operator and implementer

Allooloo Technologies Corp. operates this page from 2026-10-24 (company records line ACM-SIGNALS-01).

On the resolver. The home market's node did not answer: retry. No record is served from another store, so there is no fallback record.

# Live test — read at render through the resolver (getissuer get_signal). No API key. No account. $ curl -s https://mcp.getissuer.ai/mcp -H "content-type: application/json" -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"list_nodes","arguments":{}}}' { "note": "ACM-500 is answered only when the home node does not answer; 34 of 34 nodes answered at render" }

Connect your AI

One door for listed issuers: https://mcp.getissuer.ai/mcp (MCP, Streamable HTTP, no account). Hand your agent the door and the first call; ACM-500 is the answer only when a node does not answer, so the first call reads the live nodes.

Add this MCP server to your agent: { "mcpServers": { "getissuer": { "type": "http", "url": "https://mcp.getissuer.ai/mcp" } } } First call: {"method":"tools/call","params":{"name":"list_nodes","arguments":{}}} → the nodes on the roster, live Machine form: https://acm-500.ai/connect.json

The Seven Signals

Signal	Standard state	Action	Listed issuers (Allooloo)	CPG (GreenCore)
ACM-000	NOT_APPLICABLE	No action required.	definition	CPG-000
ACM-200	ALLOW	Execute the transaction.	TRADING	CPG-200
ACM-300	CONDITIONAL	Evaluate before proceeding.	definition	CPG-300
ACM-403	RESTRICT	Halt transaction.	HALTED	CPG-403
ACM-404	NOT_FOUND	Abort transaction.	NOT ON THE REGISTER	CPG-404
ACM-451	ESCALATE	Human-in-the-loop required.	READ THE FILING	CPG-451
ACM-500	SYSTEM_ERROR	Retry or fallback.	definition	CPG-500

Doors by what they resolve

GTINs → gtinfetch.ai/mcp (gtinfetch.ai — GreenCore Solutions Corp.)
Listed issuers (ticker, ISIN, LEI) → mcp.getissuer.ai/mcp (getissuer — Allooloo Technologies Corp.)
Receipts — the Record of Cleared Orders → mcp.rco-a2a.ai/mcp (RCO-A2A — Agentic KG Holdings)

Machine Surfaces

/signal.json · /signals.json · /connect.json · /nodes.json · /health.json · /dataset.jsonld · /llms.txt · /index.md · /sitemap.xml
/.well-known/agent-card.json · /.well-known/mcp.json · /.well-known/api-catalog · /.well-known/ai-catalog.json · /.well-known/security.txt

Ask an agent — ACM-500

Paste this into Claude or ChatGPT once the door is connected (one click selects it all):

Use the ACM-68000 signals MCP server at https://mcp.getissuer.ai/signals/mcp (Allooloo; read-only, no sign-in).
Call get_signal with the identifier I give you (ticker, ISIN or LEI) and tell me the signal it answers.
If it is ACM-500 (SYSTEM_ERROR): The home market's node did not answer: retry. No record is served from another store, so there is no fallback record. The action of the standard is: Retry or fallback.
Quote the signal, the issuer, its home node and as-of date, and the receipt decision_id; answer only from the tool. For the full record use https://mcp.getissuer.ai/mcp (resolve_issuer, get_record).

acm-signals (the signal door) https://mcp.getissuer.ai/signals/mcp
Add to Claude Add to ChatGPT Add to Cursor Add to VS Code

getissuer (the apex door, records) https://mcp.getissuer.ai/mcp
Add to Claude Add to ChatGPT Add to Cursor Add to VS Code

Generated from the ACM-68000 signal register at render — PROMPT-01.