Stringer Grounded Synthesizer for ChatGPT

app.getstringer/synthesizer

Grounded synthesis from public sources. 3 free calls total; then $0.10 brief or $0.25 deep via x402.

client:ChatGPT transport:streamable-http tools:1

Install Stringer Grounded Synthesizer in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://synthesis.getstringer.app/mcp

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs