Glossary Entry

What is Fast-Path Execution?

Fast-Path Execution enables sub-100ms signing for pre-authorised AI agent transactions using session key credentials, while remaining within the authorised policy context.

Overview

Fast-Path Execution enables sub-100ms signing for pre-authorised AI agent transactions using session key credentials, while remaining within the authorised policy context.

Fast-Path Execution is DeAgenticAI’s policy-governed performance optimisation that allows a pre-authorised, low-risk transaction to bypass the full multi-party computation (MPC) signing ceremony while remaining bound to the same policy enforcement context. The full MPC signing ceremony requires coordination across multiple distributed nodes — the right approach for high-value or novel operations, but unnecessary overhead for repetitive, pre-cleared transactions.

Fast-Path Execution operates as Layer 5 of the Agentic Control Plane. DeAgenticAI’s Agentic Control Plane enforces cryptographic policy over AI agent authority — separating what an agent can do from what it is authorized to do — in Web3 and enterprise financial environments. Within that stack, Layer 5 activates only after an intent has cleared intent validation, policy evaluation, and behavioural fraud detection upstream.

How does it work?

  1. 1

    Transaction type is pre-cleared

    The operation type must be explicitly included in the agent's fast-path allowlist.

  2. 2

    Risk score is below the fast-path threshold

    Policy DSL assigns a risk classification to each transaction type; fast-path applies only to operations scored within the configured limit.

  3. 3

    Counterparty and method are on the allowlist

    The destination address and contract method must appear in the policy's approved counterparty list.

  4. 4

    Transaction value falls within the fast-path envelope

    Per-transaction and cumulative spend caps govern what an agent can process without triggering a full signing ceremony.

  5. 5

    No behavioural anomalies are present

    Layer 4 must return a clean signal. Any detected anomaly routes the transaction to the full Intent-Evaluated MPC signing ceremony.

Why does this matter?

The term "fast path" can suggest a security trade-off. The whitepaper addresses this directly: "The fast-path is not a security bypass — it is a policy-governed operational optimization. Any transaction that does not satisfy every fast-path criterion falls back automatically."

The session key credential that powers Fast-Path is not an unconstrained authorisation token. It is scoped to a specific set of actions, expires within a bounded time window, and carries a cumulative spend ceiling — all defined in Policy DSL rules. The authorisation standard does not change in fast-path mode; what changes is whether the full distributed node coordination is required to enforce it. For transactions already policy-cleared and carrying no elevated risk profile, that coordination is optimised away without relaxing any governance constraint.

Fast-Path applies to high-frequency, predictable operations: agent-to-API payments via x402, routine portfolio rebalancing within pre-approved value bounds, or recurring protocol interactions with a fixed counterparty. High-value, novel, or anomaly-flagged operations always route to the full ceremony.

Frequently Asked Questions

What is fast-path execution in MPC signing for AI agents?

Fast-Path Execution is DeAgenticAI's mechanism for sub-100ms transaction signing for pre-authorised AI agent operations. Instead of assembling the full distributed MPC signing quorum for every transaction, fast-path uses session key credentials — ephemeral, policy-bounded tokens — to authorise signing for operations that meet all five eligibility conditions. Any transaction that does not satisfy every condition falls back automatically to the full MPC signing ceremony.

How does Fast-Path Execution maintain security while reducing latency?

The session keys powering Fast-Path are scoped credentials, not unconstrained authorisations. Each is bounded to a specific set of actions, a time window, and a cumulative spend ceiling — all defined in Policy DSL. The authorisation standard does not change; what changes is whether full distributed node coordination is required. Transactions that are policy-cleared and anomaly-free qualify; all others route to the full signing ceremony.

What are the five conditions a transaction must meet to qualify for fast-path?

All five must be satisfied simultaneously: (1) the transaction type is pre-cleared in the agent's fast-path allowlist; (2) the risk score falls below the Policy DSL threshold; (3) the counterparty address and contract method are on the approved allowlist; (4) the transaction value is within the fast-path spend envelope; (5) Behavioural Fraud Detection returns no anomaly signal. Any single failed condition routes the transaction to the full Intent-Evaluated MPC ceremony.

How does a session key differ from a standard MPC signing credential?

A standard MPC signing operation requires the distributed node quorum to assemble, verify independently, and contribute partial signatures. A session key is an ephemeral credential issued in advance for a bounded scope — specific actions, a time window, and a spend ceiling. It allows signing to proceed without the quorum assembly step while remaining bound to the same policy context governing full MPC ceremonies.

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