# Whisper API

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

Whisper API is one of 5 APIs that [Whisper Security](https://apis.io/providers/whisper-online/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Agent Identity, Transparency Log, A2A, IPv6, and DNSSEC. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, and a getting-started guide.

The keyless half of the platform as an OpenAPI 3.1.0 contract (info.version 1.1.0, 13 operations, served at https://whisper.online/openapi.json and byte-identically on agents. and endpoint.whisper.online): the single Cypher endpoint POST /api/query (keyless graph reads; with X-API-Key the whole control plane via CALL whisper.agents), the A2A JSON-RPC endpoint POST /a2a, GET /verify-identity, the RFC 6962 transparency ledger (checkpoint, key, status-list, OpenTimestamps anchor, tiles, inclusion and consistency proofs), the live service catalogue GET /menu, and the two discovery documents. The spec deliberately excludes surfaces another standard already specifies (DoH, RDAP, geofeed, security.txt, SSF, SCITT, the agent card, MCP) and points at those standards instead.

## Operations (13)

| Method | Path | Summary |
|---|---|---|
| POST | `/api/query` | The one Cypher endpoint: graph reads, and the entire control plane |
| POST | `/a2a` | A2A JSON-RPC endpoint |
| GET | `/verify-identity` | Verify an address is a real Whisper agent identity |
| GET | `/checkpoint` | Signed checkpoint of the identity transparency ledger |
| GET | `/checkpoint/key` | The public key the checkpoint is signed with |
| GET | `/checkpoint/status-list` | Revocation status list for issued identities |
| GET | `/checkpoint/ots/latest-confirmed` | Latest OpenTimestamps-confirmed checkpoint |
| GET | `/tile/{level}/{index}` | A Merkle tile of the ledger |
| GET | `/inclusion` | Inclusion proof for one ledger leaf |
| GET | `/consistency` | Consistency proof between two checkpoints |
| GET | `/menu` | Every service that is live right now |
| GET | `/.well-known/agent-card.json` | A2A Agent Card |
| GET | `/.well-known/agent-onboarding.json` | Machine-readable onboarding manifest |

## Machine-readable artifacts (10)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/whisper-online/refs/heads/main/openapi/whisper-online-openapi.json
- **OpenAPI** — https://whisper.online/openapi.json
- **Documentation** — https://whisper.online/docs
- **APIReference** — https://whisper.online/docs/graph-api
- **GettingStarted** — https://whisper.online/docs/quickstart
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/whisper-online/refs/heads/main/overlays/whisper-online-openapi-overlay.yaml
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/whisper-online/refs/heads/main/errors/whisper-online-problem-types.yml
- **Conventions** — https://raw.githubusercontent.com/api-evangelist/whisper-online/refs/heads/main/conventions/whisper-online-conventions.yml
- **AgenticAccess** — https://raw.githubusercontent.com/api-evangelist/whisper-online/refs/heads/main/agentic-access/whisper-online-agentic-access.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/whisper-online/refs/heads/main/apis.yml

## Other Whisper Security APIs (4)

- [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 A2A Agent](https://apis.io/apis/whisper-online/whisper-a2a-agent/)
- [Whisper RDAP and Identity Verification](https://apis.io/apis/whisper-online/whisper-rdap/)

## Tags

Agent Identity, Transparency Log, A2A, IPv6, DNSSEC

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