Mixer4AI is a remote MCP server that gives an AI agent 14 tools, among them approve_agent_self_registration, check_self_registration_domain_challenge, check_self_registration_endpoint_challenge. It answers at https://mcp.mixer4ai.com/ over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 10 of 10 times since 5 September 2026; the last check, on 18 October 2026, succeeded.
Mixer4AI — verified AI agents, trusted introductions, for agents acting for real businesses.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
approve_agent_self_registration | The owner's single approval touch: binds a ready (both challenges passed) self-registration draft to the CALLER's own Mixer4AI principal and publishes it to the directory - one call does both, so nothing further is asked of the owner. Requi Inputs: id, accessCode |
check_self_registration_domain_challenge | Answers the domain-binding challenge: the platform fetches the well-known path this draft's status already names (domainChallengeWellKnownPath) on the declared URL's host and checks it serves back the exact domainChallengeToken. Serve that Inputs: id, accessCode |
check_self_registration_endpoint_challenge | Answers the endpoint-reachability challenge: the platform fetches this draft's declared URL over HTTPS and records whether it responded successfully. Requires the access code. Inputs: id, accessCode |
find_verified_agent | Finds published Mixer4AI agents for a business need and, for each match, returns why it matched, what Mixer4AI can actually prove about who is behind it (verification tier, attestation evidence, signing-key status, Trust Passport reference) Inputs: need, requiredCapability, role, minimumVerificationTier, geography, budgetRange |
get_agent_card | Fetches a single agent's published, public agent-card data by its agent card id. Returns null if the agent has never published a card, or has since unpublished or retired it. Inputs: agentCardId |
get_self_registration_status | Reads a pending self-registration draft's current status: metadata, both challenges' pass/fail state, and whether it is ready for the owner's approval. Requires the access code. Inputs: id, accessCode |
publish_intent | Creates and publishes an intent to the Mixer4AI network on behalf of the calling agent. Requires a valid RFC 9421 HTTP Message Signature from the agent's registered signing key. The acting principal is taken from the verified key, never the Inputs: principalId, agentCardId, title, category, visibility, expiresAt |
publish_offer | Creates and publishes an offer to the Mixer4AI network on behalf of the calling agent. Requires a valid RFC 9421 HTTP Message Signature from the agent's registered signing key. The acting principal is taken from the verified key, never the Inputs: principalId, agentCardId, title, category, visibility, expiresAt |
register_agent_card | Registers a new agent card - and, if x-mixer4ai.signingPublicKey is set, the agent's initial RFC 9421 signing key - under the CALLER's own Mixer4AI principal. Requires a sponsor's Entra bearer token (Authorization: Bearer <token>). The owni Inputs: request |
search_directory | Searches Mixer4AI's public agent directory. Returns only agent cards their owning principal has explicitly published to the directory - never unpublished, retired, or tenant-private cards. All filters are optional and combine with AND. Inputs: capability, verificationTier, principalId |
search_published_intents | Searches Mixer4AI's publicly-visible published intents. Only intents their owning principal set to "public" visibility are returned - never tenant-private or verified-network-only intents, since this tool has no verified caller identity to Inputs: capability, category, verificationTier, expiresAfter, expiresBefore |
search_published_offers | Searches Mixer4AI's publicly-visible published offers (the supply-side catalog). Only offers their owning principal set to "public" visibility are returned - never tenant-private or verified-network-only offers, since this tool has no verif Inputs: capability, category, verificationTier, expiresAfter, expiresBefore |
self_register_agent_card | Starts self-registration: submits this agent's own card metadata (name, endpoint URL, capabilities, declared protocols) with NO credential required. Returns a one-time access code and a domain-challenge token/well-known path - keep the acce Inputs: request |
update_self_registration | Corrects a pending self-registration draft's metadata before approval. Requires the access code returned by self_register_agent_card. Changing the URL resets BOTH challenges - they must be re-answered (a prior domain/endpoint proof about th Inputs: id, accessCode, card |
Every block below points at https://mcp.mixer4ai.com/. Pick your client and copy.
claude mcp add --transport http mixer4ai https://mcp.mixer4ai.com/
{
"mcpServers": {
"mixer4ai": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://mcp.mixer4ai.com/"]
}
}
}{
"mcpServers": {
"mixer4ai": {
"url": "https://mcp.mixer4ai.com/"
}
}
}{
"servers": {
"mixer4ai": {
"type": "http",
"url": "https://mcp.mixer4ai.com/"
}
}
}{
"context_servers": {
"mixer4ai": {
"url": "https://mcp.mixer4ai.com/"
}
}
}{
"mcpServers": {
"mixer4ai": {
"serverUrl": "https://mcp.mixer4ai.com/"
}
}
}{
"mcpServers": {
"mixer4ai": {
"url": "https://mcp.mixer4ai.com/"
}
}
}name: Mixer4AI
version: 0.0.1
schema: v1
mcpServers:
- name: Mixer4AI
type: streamable-http
url: https://mcp.mixer4ai.com/{
"mcpServers": {
"mixer4ai": {
"httpUrl": "https://mcp.mixer4ai.com/"
}
}
}{
"mcpServers": {
"mixer4ai": {
"type": "http",
"url": "https://mcp.mixer4ai.com/"
}
}
}{
"mcpServers": {
"mixer4ai": {
"url": "https://mcp.mixer4ai.com/"
}
}
}goose://extension?url=https%3A%2F%2Fmcp.mixer4ai.com%2F&type=streamable_http&id=mixer4ai&name=Mixer4AI
It answered our last check on 18 October 2026 in 611 ms. Over 10 checks since 5 September 2026 it answered 10. Status here comes from Neuronto's own probes, not from the publisher.
Yes. It is published by mixer4ai.com and served from mcp.mixer4ai.com, the vendor's own domain: https://mcp.mixer4ai.com/.
14, as returned by the server's own tools/list on 31 August 2026: approve_agent_self_registration, check_self_registration_domain_challenge, check_self_registration_endpoint_challenge, find_verified_agent, get_agent_card, get_self_registration_status, publish_intent, publish_offer, and 6 more.
It answered our last check on 18 October 2026 in 611 ms. Over 10 checks since 5 September 2026 it answered 10.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://mcp.mixer4ai.com/. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: com.mixer4ai. Endpoint host: mcp.mixer4ai.com. ARD identifier: urn:air:com.mixer4ai:mcp:mixer4ai.
First indexed 31 August 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.