# Nullary (nullary.ai)

Searches a citable archive of failed drug compounds, terminated trials and failed screens, served through an MCP server or REST API.

- Atlas card: https://inite.ai/en/atlas/nullary.ai
- Site: https://nullary.ai
- For: Drug discovery researchers and teams who want structured failed-experiment data before starting new work
- Categories: health
- Use 0/100 · alive 100/100

## Used for

- Search failed compounds and terminated trials by target
- Check whether a target's inhibitors previously failed
- Review failed CRISPR screens before repeating experiments

## Price

- from 49 USD/month, free plan (read 2026-10-23 on https://nullary.ai/pricing)

## For developers

- MCP server: ai.nullary/nullary (namespace; open on 2026-10-23, 35 tools)
- Read 2026-10-23

## MCP server, measured daily

Server: https://mcp.nullary.ai/mcp, checked every day since 2026-10-24 (4 checks).

- Answered: measuring, 4 daily checks so far
- Median first answer: 151 ms
- Sign-in: none
- Context its tool definitions take: about 7304 tokens (35 tools)
- Tool definitions: A, 100/100
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: gdpr, hipaa
- Read 2026-10-23

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Source: INITE Atlas, https://inite.ai/en/atlas/nullary.ai. JSON: https://inite.ai/api/atlas/nullary.ai. MCP: https://inite.ai/api/mcp (atlas_lookup).