What is an Agent Denylist?

1 min read Updated

A denylist blocks an agent from transacting with specific addresses, contracts, or services. Any denylisted recipient is immediately blocked regardless of other policy conditions.

WHY IT MATTERS

Denylists define where agents absolutely cannot send. Useful for known malicious addresses, sanctioned entities, and compromised contracts.

Often organization-wide, shared across the fleet. When a scam address is identified, adding it protects all agents immediately.

Sources include threat intelligence feeds, OFAC sanctions, on-chain security providers, and custom rules.

HOW POLICYLAYER USES THIS

PolicyLayer enforces denylists with highest priority — a denylisted recipient always blocks, even if the transaction would otherwise pass.

FREQUENTLY ASKED QUESTIONS

Auto-update?
PolicyLayer integrates with external threat feeds for automatic updates. Manual entries via API/dashboard.
Override other policies?
Yes. Denylist is absolute — always blocks regardless of amount, allowlist, or other conditions.
Block categories?
Yes — pattern-based denylists can block entire contract types like mixers.

FURTHER READING

Enforce policies on every tool call

Intercept is the open-source MCP proxy that enforces YAML policies on AI agent tool calls. No code changes needed.

npx -y @policylayer/intercept
github.com/policylayer/intercept →
// GET IN TOUCH

Have a question or want to learn more? Send us a message.

Message sent.

We'll get back to you soon.