AEVS by Fetch.ai

AEVS by Fetch.ai is an open-source SDK and verification layer that records signed, tamper-evident receipts for AI agent tool calls. It is aimed at teams that need proof of what an agent executed rather than relying only on model replies or fragile logs.

• Tool-call receipts — captures tool name, inputs, outputs, timing, status, and errors for each agent action • Cryptographic verification — official site describes ECDSA P-256 signatures and a hash chain to detect altered or skipped receipts • Framework support — official page lists LangChain 0.2+, MCP 1.20+, and Python 3.10–3.13 • Independent verification — receipts can be checked through a public API or explorer using a reference_id • Privacy controls — visibility modes include public, private, and proof_only for different payload exposure needs