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Agents tracked: 444 Releases (7d): 644 Agent status: 3 with issuesSince last limit reset: Claude 31d · Codex 3d Updated Oct 23, 2026
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App and agent security · by Fetch.ai

AEVS (Agent Execution Verification System)

A Python SDK plus hosted backend that records every tool call a LangChain/LangGraph or MCP agent makes as a signed, hash-chained receipt, which anyone with the receipt ID can check through a public API or explorer.

A model saying it refunded a customer is not proof; AEVS gives you a checkable record of which tool ran, with what inputs and output, without changing your tools.

APIOpen sourceLicense unclear

Open aevs.fetch.ai ↗ agent.md

For your project

Official API
Official API Beta; APIs and explorer may change. SDK truncates receipt payloads above 1 MB by default
“Returns receipt metadata, hash-chain status, and KMS signature info.” aevs.fetch.ai/llms.txt
Key
Needed
“Credentials from the dashboard at https://aevs.fetch.ai (sign up, register an agent)” aevs.fetch.ai/llms.txt
Formats
JSON
Data download
Not stated
Price
No free tier stated
Open source
fetchai/AEVS-sdk
License
Apache License 2.0 (SDK); no service terms page found The Python SDK is Apache 2.0; terms for the hosted receipt backend and dashboard are not published on the site
Commercial use
Commercial use unclear
Credit
Not stated
Embedding
Embedding unclear
Using the website
Free
“Verify via API or explorer No account required. Same signed proof either way.” aevs.fetch.ai/

Read on AEVS (Agent Execution Verification System)'s own pages on Oct 24, 2026 · license or terms · API docs · source code. Check the license page before you ship.

For your agent

A request your code or agent can make (add your key):

https://api.aevs.fetch.ai/v1/public/receipts/stats
  • pip install "aevs[langchain]" or "aevs[mcp]" (Python 3.10+), set AEVS_API_KEY and AEVS_AGENT_ID from the dashboard, call aevs.configure() then aevs.enable(), and aevs.flush() before exit; verify a receipt with GET https://api.aevs.fetch.ai/v1/receipts/verify/<reference_id>, no auth.
  • Use receipt_visibility "private" or "proof_only" for personal or regulated data; "public" exposes full inputs and outputs to anyone with the reference_id
  • Call aevs.flush() before a short-lived script exits or recent receipts may not be sent
  • A receipt proves the SDK recorded the call, not that the external system performed it

llms.txt: aevs.fetch.ai/llms.txt

Paste into your agent: Read https://agentgid.com/resources/aevs/agent.md before using AEVS (Agent Execution Verification System).

Quick answers

Does AEVS (Agent Execution Verification System) have an API?

Yes. AEVS (Agent Execution Verification System) has an official API documented at https://github.com/fetchai/AEVS-sdk/tree/main/docs.

Does the AEVS (Agent Execution Verification System) API need a key?

Yes, you need an API key. Limits: Beta; APIs and explorer may change. SDK truncates receipt payloads above 1 MB by default

What you can build

  • A payments or refunds agent that shows the user a receipt link for every action it took
  • An audit page for an internal agent that lists signed tool-call receipts per run, using proof_only mode for sensitive data
  • A CI check that replays an agent task and fails if any receipt's hash chain status is broken or has gaps

Alternatives in App and agent security

All 5 →

ClawSecure Before you let a third-party skill or MCP server touch your files and keys, you can look up or run an audit and have your agent check a clearance verdict and content hash in one API call. API, no keyFree tierLicense unclear Arcjet You add bot blocking, rate limits and prompt-injection checks as a few lines inside a route handler or agent tool call instead of putting a proxy or WAF in front of the app. APIFree tierCommercial: conditions DCP (Delegated Custody Protocol) Agents can sign, pay or call an API without ever reading the raw key from a .env file, and anything over a limit waits for your approval on desktop, Telegram or phone. Open sourceFree tierCommercial OK MonoCloud You add login, sessions and API token checks to an app with an SDK instead of building password storage, social providers and passkeys yourself, and the free plan covers up to 50,000 monthly active users. APIFree tierCommercial OK

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