# signupbouncer (signupbouncer.com)

Checks new Supabase signups for throwaway emails and datacenter IPs, then allows, challenges or blocks them.

- Atlas card: https://inite.ai/en/atlas/signupbouncer.com
- Site: https://signupbouncer.com
- For: App teams whose free signup credits are farmed by fake accounts, using Supabase, Firebase, Next.js or a REST API
- Use 0/100 · alive 100/100

## Used for

- refuse disposable email addresses at signup
- log would-be blocks before turning enforcement on
- spot repeat accounts from one inbox or network

## Price

- from 19 USD/month, free plan (read 2026-10-28 on https://signupbouncer.com/pricing)

## For developers

- OpenAPI: https://signupbouncer.com/openapi.json (6 paths)
- MCP server: com.signupbouncer/checker (namespace; open on 2026-10-28, 6 tools)
- Status page: https://signupbouncer.com/status
- Read 2026-10-28

## MCP server, measured daily

Server: https://signupbouncer.com/mcp, checked every day since 2026-10-28 (7 checks).

- Answered: 100% of daily checks
- Median first answer: 280 ms
- Sign-in: none
- Context its tool definitions take: about 2165 tokens (6 tools)
- Tool definitions: A, 100/100
- Warning "open_writes": update_rules
- Method: https://inite.ai/en/atlas/mcp/report

## Your data

- Certifications stated: none
- Read 2026-10-28

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