# AlgoVoi RFC 9421 Clinic (Verifiable-Comms Agent) API

**Canonical:** https://apis.io/apis/algovoi-co-uk/algovoi-rfc9421-clinic-api/  
**Provider:** AlgoVoi — https://apis.io/providers/algovoi-co-uk/  
**Base URL:** https://agents.algovoi.co.uk  
**Documentation:** https://agents.algovoi.co.uk/clinic/guide

AlgoVoi RFC 9421 Clinic (Verifiable-Comms Agent) API is one of 6 APIs that [AlgoVoi](https://apis.io/providers/algovoi-co-uk/) publishes on the [APIs.io](https://apis.io/) network, described by a machine-readable OpenAPI specification. Tagged areas include Digital Signature, Verification, A2A, MCP, and Agent-Native. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, and authentication docs.

Free, anonymous, verify-only service at agents.algovoi.co.uk (OpenAPI 3.1.0 "AlgoVoi Verifiable-Comms Agent" 0.1.0, 9 operations): verify an RFC 9421 HTTP message signature with RFC 9530 Content-Digest offline against a supplied Ed25519 key or did:key, get a diagnosis with the exact canonical signature base, or fetch a known-good signed request from an ephemeral demo key. Reachable over plain HTTP, A2A JSON-RPC (/a2a; message/send for 0.3.0 and SendMessage for 1.0.1) and an anonymous Streamable HTTP MCP server (/mcp) exposing the same tools. Backed by the shipped algovoi-rfc9421-verifier 0.4.4 package.

## Operations (9)

| Method | Path | Summary |
|---|---|---|
| GET | `/.well-known/agent-card.json` | Agent Card |
| GET | `/.well-known/agent.json` | Agent Card Legacy |
| GET | `/health` | Health |
| POST | `/verify/rfc9421` | Verify |
| POST | `/verify/rfc9421/explain` | Explain |
| POST | `/verify/rfc9421/sign` | Sign Demo |
| GET | `/a2a` | A2A Hint |
| POST | `/a2a` | A2A |
| GET | `/` | Landing |

## Machine-readable artifacts (14)

- **OpenAPI** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/openapi/algovoi-co-uk-clinic-openapi.yml
- **OpenAPI** — https://agents.algovoi.co.uk/openapi.json
- **Documentation** — https://agents.algovoi.co.uk/clinic/guide
- **Documentation** — https://docs.algovoi.co.uk/rfc9421-verifier
- **APIReference** — https://agents.algovoi.co.uk/docs
- **AgentCard** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/a2a/algovoi-co-uk-a2a.yml
- **AgentCard** — https://agents.algovoi.co.uk/.well-known/agent-card.json
- **MCPServer** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/mcp/algovoi-co-uk-mcp.yml
- **MCPServer** — https://agents.algovoi.co.uk/mcp
- **LLMsTxt** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/llms/algovoi-co-uk-clinic-llms.txt
- **LLMsTxt** — https://agents.algovoi.co.uk/llms.txt
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/authentication/algovoi-co-uk-authentication.yml
- **Overlay** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/overlays/algovoi-co-uk-clinic-overlay.yaml
- **AgentSkill** — https://raw.githubusercontent.com/api-evangelist/algovoi-co-uk/refs/heads/main/skills/algovoi-co-uk-rfc9421-clinic.md

## Other AlgoVoi APIs (5)

- [AlgoVoi Pay (Payable Core) API](https://apis.io/apis/algovoi-co-uk/algovoi-pay-payable-core-api/)
- [AlgoVoi Gateway API](https://apis.io/apis/algovoi-co-uk/algovoi-gateway-api/)
- [AlgoVoi Agent Trust Bench API](https://apis.io/apis/algovoi-co-uk/algovoi-agent-trust-bench-api/)
- [AlgoVoi Audit Verifier API](https://apis.io/apis/algovoi-co-uk/algovoi-audit-verifier-api/)
- [AlgoVoi MCP Server](https://apis.io/apis/algovoi-co-uk/algovoi-mcp-server/)

## Tags

Digital Signature, Verification, A2A, MCP, Agent-Native

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/algovoi-co-uk/algovoi-rfc9421-clinic-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/algovoi-co-uk/.