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Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Paid plans only
Biggest pro
Provides verifiable proof of agent execution, crucial for auditing and compliance.
Biggest con
Requires integration and configuration within the agent's codebase.
TL;DR - AEVS
- Generates cryptographically signed, tamper-evident receipts for AI agent tool calls.
- Provides independent verification of agent actions via API or explorer.
- Offers flexible data visibility settings for receipts, from public to proof-only.
Pricing: Paid only
Best for: Enterprises & pros
What is AEVS?
AEVS (Agent Event Verification Service) is an SDK that provides tamper-evident, cryptographically signed receipts for every tool call made by an AI agent. It sits between the agent and its tools, capturing tool name, inputs, output, timing, and errors for each invocation. Each record is then ECDSA-signed (P-256) and linked to the previous one, forming a verifiable hash chain. This service addresses the challenge of verifying AI agent actions, where a model's text output alone isn't sufficient proof of execution. AEVS provides an independent, portable proof of agent activity, making it valuable for auditing, compliance, and debugging. It offers flexible visibility settings for receipts, allowing users to control what data is exposed publicly or kept private, including a "proof_only" mode for sensitive data that should never be persisted.
Pros & Cons
Pros
- Provides verifiable proof of agent execution, crucial for auditing and compliance.
- Simplifies debugging and reconstruction of agent actions.
- Offers granular control over data exposure for sensitive operations.
- Easy to integrate with popular AI agent frameworks.
- Open-source SDK promotes transparency and community contributions.
Cons
- Requires integration and configuration within the agent's codebase.
- Adds an additional step to the agent's execution flow, potentially introducing minimal latency.
- Relies on an external service for verification and storage of receipts.
Key Features
Automatic capture of agent tool calls (name, inputs, output, timing, errors)ECDSA P-256 cryptographic signing of each receiptHash chain linking receipts to detect alterations or skipsIndependent verification via public API or explorer UIDrop-in SDK for easy integration with existing agent frameworksConfigurable receipt visibility (public, private, proof_only)Support for LangChain and MCP frameworksKMS-backed key management for signing
Pricing
Paid
AEVS offers paid plans. Visit their website for current pricing details.
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AEVS FAQ
How does AEVS provide verifiable proof of AI agent actions?
AEVS provides tamper-evident, cryptographically signed receipts for every tool call made by an AI agent. Each record is ECDSA-signed and linked to the previous one, forming a verifiable hash chain that serves as independent proof of activity.
Which teams would benefit most from using AEVS?
Teams focused on auditing, compliance, and debugging AI agent operations would find AEVS most beneficial. It provides the necessary verifiable proof of agent execution and simplifies the reconstruction of agent actions.
How does AEVS compare to LangChain regarding agent verification?
AEVS specifically focuses on providing cryptographically signed, tamper-evident receipts for AI agent tool calls, creating a verifiable proof of execution. LangChain, while a framework for building agents, does not inherently offer this level of independent, verifiable proof for agent actions.
What kind of data does AEVS capture for each tool invocation?
For each tool invocation, AEVS captures the tool name, its inputs, the output, timing information, and any errors that occurred. This detailed record is then cryptographically signed and chained.
Does AEVS allow for control over the visibility of sensitive data in receipts?
Yes, AEVS offers flexible visibility settings for receipts, allowing users to control what data is exposed publicly or kept private. It includes a 'proof_only' mode specifically for sensitive data that should never be persisted.
How is AEVS priced?
AEVS is offered as a paid product and does not include a permanently free tier. Its pricing model is designed for commercial use.
Source: aevs.fetch.ai