# Whisper A2A Agent

**Canonical:** https://apis.io/apis/whisper-online/whisper-a2a-agent/  
**Provider:** Whisper Security — https://apis.io/providers/whisper-online/  
**Base URL:** https://whisper.online/a2a  
**Documentation:** https://whisper.online/docs/a2a-trust

Whisper A2A Agent is one of 5 APIs that [Whisper Security](https://apis.io/providers/whisper-online/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include A2A, agent-native, and Agent Identity. The published artifact set on APIs.io includes API documentation.

Agent2Agent surface: an A2A 1.0-shaped card at https://whisper.online/.well-known/agent-card.json (version 0.219.2, provider Whisper Security, JSONRPC binding, capabilities object, 37 skills — 15 keyless cognition and signup skills, 22 key-gated skills including every whisper.agents control-plane op) and a legacy 0.3.0-shaped twin at /.well-known/agent.json, both served on six hosts. The JSON-RPC 2.0 endpoint https://whisper.online/a2a answers GET with -32600 pointing back at the card; skills are a binding over the same Cypher call the REST endpoint runs.

## Machine-readable artifacts (3)

- **AgentCard** — https://raw.githubusercontent.com/api-evangelist/whisper-online/refs/heads/main/a2a/whisper-online-a2a.yml
- **AgentCard** — https://whisper.online/.well-known/agent-card.json
- **Documentation** — https://whisper.online/docs/a2a-trust

## Other Whisper Security APIs (4)

- [Whisper API](https://apis.io/apis/whisper-online/whisper-api/)
- [WhisperGraph and Control Plane (Cypher API)](https://apis.io/apis/whisper-online/whispergraph-control-plane/)
- [WhisperGraph MCP Server](https://apis.io/apis/whisper-online/whispergraph-mcp-server/)
- [Whisper RDAP and Identity Verification](https://apis.io/apis/whisper-online/whisper-rdap/)

## Tags

A2A, agent-native, Agent Identity

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