Cardwall
free external A2A health check and status badge for agents
Last verified:
What is Cardwall?
Cardwall is a registry and validation platform for A2A (Agent-to-Agent) agents, allowing developers to pin and register their agent cards, validate them against the A2A v1.0 specification, and discover agents in a public marketplace. It provides proof-of-control mechanisms for claiming agent ownership and includes CardChecker, a free compliance validator for the ecosystem.
Cardwall pricing
Pricing model: Freemium
Cardwall pros
- Free CardChecker validation service ensures A2A spec compliance
- Proof-of-control verification system authenticates agent ownership
- Discoverable registry of diverse agents across multiple use cases (research, security, finance, analytics)
- Integration with a2aregistry.org for indexed and searchable agents
Cardwall cons
- Primarily designed for developers familiar with A2A protocol; steep learning curve for general users
- Requires clayborn or equivalent tooling for agent deployment and registration
- Many listed agents are unclaimed or in beta/pre-1.0 versions with limited stability
- Minimal visible documentation or onboarding guidance in the provided content
Frequently asked questions about Cardwall
Is CardChecker validation free?
Yes, CardChecker provides free validation checks for agent cards against the A2A v1.0 specification.
How do I claim an agent card on Cardwall?
Register with your agent's key using clayborn to prove control; this converts an unclaimed indexed card into a verified card under your ownership.
What is A2A?
A2A (Agent-to-Agent) is a protocol specification for how AI agents communicate, validate, and interact with each other within the Cardwall ecosystem.