For Agents
Programmatically validate email address, validate domain. Covers 8 operations with bearer authentication.
Install Jentic One Beta
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the UserCheck API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fusercheck.com%2Fusercheck" | shStep 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fusercheck.com%2Fusercheck" | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
What an agent can do with UserCheck API.
Validate email address
Add domain to blocklist
List blocklisted domains
Bulk add domains to blocklist
GET STARTED
Use for: I need to validate email address, I want to validate domain, Search for add domain to blocklist, Find all blocklisted domains
Not supported: Does not handle payments, crm, or developer tools - use for communications only.
An API designed to help businesses and developers detect and block disposable (temporary) email addresses. The API exposes 8 endpoints secured with bearer authentication.
Check domain blocklist status
Remove domain from blocklist
Patterns agents use UserCheck API for, with concrete tasks.
★ Communications Operations
Use the UserCheck API to perform communications operations programmatically. The API provides 8 endpoints covering core functionality including validate email address, validate domain, add domain to blocklist.
Call GET /email/{email} to validate email address
Automated blocklist Management
Automate blocklist operations by combining multiple UserCheck API endpoints. Agents can validate domain and then add domain to blocklist in a single workflow.
Call GET /domain/{domain} to validate domain, then verify the result
AI Agent Integration via Jentic
AI agents discover and call UserCheck API endpoints through Jentic without managing credentials directly. An agent searches for the required operation by intent, receives the matching endpoint schema, and executes the call with Jentic-managed authentication. This eliminates the need to read API documentation or handle bearer tokens manually.
Search Jentic for 'validate email address', load the operation schema, and execute with Jentic-managed credentials
8 endpoints — an api designed to help businesses and developers detect and block disposable (temporary) email addresses.
METHOD
PATH
DESCRIPTION
/email/{email}
Validate email address
/domain/{domain}
Validate domain
/blocklist
Add domain to blocklist
/blocklist
List blocklisted domains
/blocklist/bulk
Bulk add domains to blocklist
/blocklist/{domain}
Check domain blocklist status
/blocklist/{domain}
Remove domain from blocklist
/status
Get API status
/email/{email}
Validate email address
/domain/{domain}
Validate domain
/blocklist
Add domain to blocklist
/blocklist
List blocklisted domains
/blocklist/bulk
Bulk add domains to blocklist
What agents get from Jentic-routed access to this vendor.
Setup
Wiring the UserCheck API by hand means attaching its bearer token, encoding the email or domain into the path, and maintaining your blocklist through separate calls yourself. Through Jentic you install once, import UserCheck from the API Directory, store the token once, and your agent calls it.
Permission scoping
UserCheck puts the domain in the URL path (/blocklist/{domain}), so a rule can pin your agent to one domain's blocklist entry: it can read that entry if you allow it. You choose the operations it may call, so blocklist deletion is not included unless you add it.
Credential isolation
Your UserCheck token is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.
Intent-based discovery
Agents search Jentic by intent such as 'validate an email address' or 'check a domain', and Jentic returns the matching UserCheck operation with its input schema so the agent calls the right endpoint without browsing the reference docs.
Alternatives and complements available in the Jentic catalogue.
Specific to using UserCheck API through Jentic.
What authentication does the UserCheck API use?
The UserCheck API uses a Bearer token in the Authorization header. Through Jentic, these credentials are stored encrypted in your Jentic One instance and injected at execution time, so raw secrets never enter the agent context.
Can I validate email address with the UserCheck API?
Yes. Use the GET /email/{email} endpoint. The API returns structured JSON responses that agents can parse and act on directly.
What are the rate limits for the UserCheck API?
Rate limits are not specified in the OpenAPI spec. Check the vendor documentation for current limits. Through Jentic, rate limiting is handled automatically with retry logic built into the execution layer.
How do I validate email address through Jentic?
Install the Jentic SDK with pip install jentic, authenticate through Jentic One, the self-hosted execution layer, then search for 'validate email address'. Jentic returns the matching UserCheck API operation with its input schema. Load the schema and execute the call - credentials are injected automatically.
How many endpoints does the UserCheck API have?
The UserCheck API exposes 8 endpoints covering blocklist, domain, email operations.
/blocklist/{domain}
Check domain blocklist status
/blocklist/{domain}
Remove domain from blocklist
/status
Get API status