ARIA Protocol vs Kairos

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

ARIA Protocol compared with Kairos
Detail	ARIA Protocol	Kairos
What it does	Open protocol for AI agent identity, DNS-anchored and post-quantum native, governed by a nonprofit	The transaction layer for AI agents
Stage	Startup	MVP
Founded	2026	Not given
Based in	MX	US
Pricing model	Open source	Contact for pricing
Pricing	Free to use. L0 credentials issued today. L1 enabled in agent.bar demonstration. L2 and L3 specified but not yet issued.	Per-execution pricing: one fee per execution that returns proof, charged only when proof comes back. Failed or cancelled runs cost nothing. Planning and approvals are free.
Key features	W3C Verifiable Credentials (AID format) Four trust levels (L0-L3) with progressive verification DNS anchoring starting at L1 ML-DSA-65 + Ed25519 composite signatures ARIA AP for signed requests and receipts Append-only Trust Ledger with credential lifecycle events Revocation capability with signed status lists Public REST API verification endpoint TypeScript SDK for credential verification	Boundary approval system for controlled execution Checkpoint-based resumable execution Verifiable proof of completion Composable proof for multi-agent workflows Per-execution pricing model Integration with multiple agent frameworks
What makes it different	Post-quantum native from launch, not a migration plan Governed by nonprofit to prevent capture Complements existing protocols without replacing them L0 credentials issued and verifiable today	Pay only for verified results, not for attempts or planning Human-approved boundaries ensure agent actions stay within limits Interruptible checkpoints allow pausing and resuming executions Proof is built into results for auditability and composability
Community votes	0	0
DR (Domain Rating by Ahrefs)	23 no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	7	0
Citation Flow (Majestic)	20	10
Referring domains (Majestic)	10	1

7 details filled in for both companies.

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