# OpenNous API: accounts and signals for your apps and agents

_Last updated: 2026-10-18 · https://www.opennous.cloud/api_

**Build on your account data.** Connect your GTM stack with the REST API, MCP or the Claude Code plugin, and work with every account inside your agents.

Every account as one open-source, self-updating record, built from your own calls, email and CRM, that any agent can read.

## Infrastructure you can trust

Every fact is resolved, sourced, dated and permissioned before a person or an agent reads it.

- **Identity resolution.** One person and one company, however many systems they appear in.
- **Account signals.** Budget, authority, competitors, adoption and risk, read from what was actually said and dated to the day.
- **Sources on every fact.** Every answer returns the call, email or record behind it.
- **Permissions.** Facts inherit the visibility of the record they came from, for people and agents alike.
- **Freshness.** Each fact carries the date of its source, so a stale answer shows as stale.
- **Your data, your infrastructure.** Self-host the whole engine, or keep the raw records in a database you own.

## Every way in

REST for your code, MCP for your agents, webhooks for your workflows and a plugin for the terminal. One account record behind all four.

- **REST API: the whole account in one call.** Summary, claims with confidence and freshness, people and timeline. Look an account up by domain, email, LinkedIn URL or id.
- **MCP: context for any agent.** Gives Claude, Claude Code, Grok or your own agent the full account, on demand. Server: `https://mcp.opennous.cloud/mcp`
- **Query: ask across every account.** One question over the whole book, one ranked row per account back.
- **Webhooks: signals, pushed as they happen.** Subscribe once and every new signal lands at your endpoint, in Slack or with your agent.
- **Claude Code plugin: revenue work from the terminal.** Briefs, follow-ups and pipeline reviews as slash commands. https://github.com/NousC/revenue-plugin

## Deploy it yourself, or start now

- **Self-host OpenNous:** https://github.com/NousC/opennous
- **Start on the Free plan:** 500 credits a month, no card. https://app.opennous.cloud/signup
- Docs: https://docs.opennous.cloud/getting-started/introduction