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Ressl gives you fake but realistic SaaS APIs (CRM, tickets, chat, IT tools, and more) that your agents and evals can call like the real thing. You pick a provider your org has access to, create a short-lived snapshot, and get a normal HTTPS base URL. Point your agent at that URL. When the time-to-live ends, the snapshot goes away.

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Two hosts

Create and manage snapshots on simulation.ressl.ai. Call the mock itself on *.mock.ressl.cc.

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How it works

  1. Create an API key in the console (Settings).
  2. Ask the API which providers your org can use.
  3. Create a snapshot for one provider (optional starting data + TTL).
  4. Use the returned url as the API base until it expires.

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For people and agents

Quickstart

API key → list providers → create a snapshot → call the mock URL.

Salesforce

Seed, describe config, and REST examples for the Salesforce mock.

LinkedIn UI clone

Launch a browser-ready LinkedIn clone with deterministic built-in data.

Gmail Business UI clone

Launch a browser-ready business inbox with synthetic built-in data.

Continuous evals

Score your agent against mock worlds on every push and fail the build on a regression.

API reference

Auth, list providers, and create-snapshot endpoints.
Use Copy skill in the top bar (left of Console) to copy the agent skill, or load it from /skill.md (npx skills add with your docs URL).