UserGems is a San Francisco-based sales intelligence platform that tracks champion job changes and surfaces buying signals so sales and marketing teams can prioritize outbound and ABM motions. The platform packages 30+ native signals (job changes, contact-level intent, M&A, hiring, web visits), Gem-E AI agents for prospect list building and email personalization, and custom AI scoring trained on 600+ closed-won patterns. UserGems exposes a public REST API at api.usergems.com/v1 that lets customers programmatically add and remove contacts to track for job changes, add and remove target accounts, and honor data-subject deletion requests. That API is deliberately write-only — there are no read or GET endpoints — authenticates with a single company-wide X-Api-Key header, is capped at 20 requests per second with one record per request, and acknowledges enqueueing rather than completion. UserGems also ships a hosted remote MCP server at app.usergems.com/mcp/usergems, in gated early access as of August 2026, that lets agents in Claude or ChatGPT search accounts and prospects, pull signal and score history, run research, draft Gem-E messages, and build and run campaigns including CRM writes, sequence enrollment and ad-audience sync — authorized with OAuth 2.0, dynamic client registration, PKCE S256 and a single mcp:use scope. Native integrations include Salesforce, HubSpot, Microsoft Dynamics, Outreach, Salesloft, Gong Engage, Marketo, LinkedIn Ads, Meta Ads, and Google Ads.
UserGems publishes 4 API contracts indexed on the APIs.io network, including Accounts API, Contacts API, Privacy API, and 1 more. Tagged areas include Sales Intelligence, Outbound, Account Based Marketing, Champion Tracking, and Job Changes.
The UserGems catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 2 Spectral governance rulesets.
UserGems’ developer surface includes authentication, API reference, getting-started guide, developer portal, documentation, signup flow, pricing, and 47 more developer resources.
The questions people put to an LLM, and the jobs they hand an agent, that UserGems's APIs answer — each one linked to the operation that does it.
Generated by API Evangelist
Regulatory Posture applies to this provider. Its tags matched the
Horizontal (data, software, accessibility, platform) regime, so
Regulatory Posture carries 15 points of the composite.
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applicability map is public and we will correct it.
Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it
carries 10 points of the composite. It is scored from the published contracts
themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already
holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in
front of it, and the first time that check is skipped a duplicate record is created.
Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet,
not penalised by it.
The six quality facets above are damped to 75 points between them,
because the conditional facet above carries the other
25. That is why each facet's contribution is shown against a damped
maximum: raising a quality facet moves the composite by 75% of its nominal
weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/usergems: open an issue to ask a question, or submit a pull request to add artifacts.
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Markets this provider is in provisional
The Kin Score Market layer reads a provider inside its market:
its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted:
not part of the Kin Score or agent readiness.
Registered MCP server and declares compatibility are report only — not weighted.
Undeclared means we found nothing we can read, so there is no number: we never infer integrations.
Hosted remote MCP server that lets an agent in Claude, ChatGPT or any MCP-compatible client work against the customer's own UserGems workspace — searching accounts and prospects...
UserGems ships a hosted, remote MCP server — "UserGems MCP" — that lets an agent build and run GTM campaigns against the customer's own UserGems workspace and CRM from Claude or...
Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.
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