# brick.blue A2A agent

**Canonical:** https://apis.io/apis/brick-blue/a2a-agent/  
**Provider:** brick.blue — https://apis.io/providers/brick-blue/  
**Base URL:** https://brick.blue/a2a  
**Documentation:** https://brick.blue/llms.txt

brick.blue A2A agent is one of 3 APIs that [brick.blue](https://apis.io/providers/brick-blue/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include A2A, Agent-Native, and AI Agents. The published artifact set on APIs.io includes API documentation.

JSON-RPC A2A door at https://brick.blue/a2a, advertised by a JWS-signed agent card at /.well-known/agent-card.json (also at the legacy agent.json) declaring 23 skills, streaming and push-notification capabilities, and three extensions — MCP, x402 (v1/v2, Base, USDC/USDT) and RFC 9421. The card's endpoints and protocol version (1.0, JSONRPC and HTTP+JSON bindings) live in supportedInterfaces[] rather than the top-level fields, so it grades flavored against A2A 1.0.0 while the door itself is live: hub/get-started answered a 9.7 KB orientation over JSON-RPC without credentials. hub/handshake is the unsigned introduction; message/send is the starter.

## Machine-readable artifacts (3)

- **AgentCard** — https://raw.githubusercontent.com/api-evangelist/brick-blue/refs/heads/main/a2a/brick-blue-a2a.yml
- **AgentCard** — https://brick.blue/.well-known/agent-card.json
- **Documentation** — https://brick.blue/llms.txt

## Other brick.blue APIs (2)

- [brick.blue Hub API](https://apis.io/apis/brick-blue/hub-api/)
- [brick.blue MCP server](https://apis.io/apis/brick-blue/mcp-server/)

## Tags

A2A, Agent-Native, AI Agents

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/brick-blue/a2a-agent/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/brick-blue/.