Bulk API
High-volume batch processing
POST JSON batches of domains, IPs, and URLs to https://api.ismalicious.com/bulk/check. One synchronous response with per-entity verdicts, confidence, and categories.
Database Scale
What you're checking against when you call the bulk API.
No credit card required. Instant access to full datasets.
10–100
Entities/Request
JSON
In / Out
0 call
Synchronous
Plans
Scaled limits
Key Features
Everything you need to protect your infrastructure and users
Single POST
One request returns all entity results plus processingTimeMs.
JSON body
{ entities: string[], enrichment?: string } — simple integration.
Mixed types
Domains, IPs, and URLs in the same entities array.
Plan limits
GET /bulk/check returns your max batch size and usage.
Structured results
isMalicious, confidence, sources, categories per row.
Same auth
X-API-KEY (Base64 apiKey:apiSecret) like /check.
Use Cases
How security teams use this tool
Log Enrichment
Enrich SIEM logs with threat data in batch.
List Validation
Validate blocklists and IOC lists against our intel.
Email Processing
Check all URLs and domains from email batches.
Threat Hunting
Analyze large sets of IOCs during investigations.
Batch checks in one request
POST https://api.ismalicious.com/bulk/check with { "entities": [...], "enrichment": "full" }. The API responds with success, total, processed, results[] (entity, type, isMalicious, confidence, sources, categories), optional errors[], and processingTimeMs. Authentication uses X-API-KEY with Base64(apiKey:apiSecret).
Plan limits
Maximum entities per request scales with subscription (10 on Free and 100 on Pro). Use GET /bulk/check to retrieve documentation and limit metadata for your key.
When to use bulk vs single check
Use bulk for dashboards, CSV validation, or moderate-sized lists. For deep per-entity reports or streaming progress, use GET /check or SSE /check/stream.
Larger workloads
For lists longer than your plan allows, chunk requests client-side and respect rate limits. See /api/rate-limits and your dashboard usage.
Frequently Asked Questions
How many items can I submit per request?
What input formats are supported?
Is processing synchronous?
Can I get full enrichment per entity?
Related Tools
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Learn more from our security research blog
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