Substack
Substack currently lives behind /research, which is the right fit when you are comparing writers, newsletters, or recurring posts across publications.
Example
Source-filtered Substack research
```bash
curl https://api.faircompany.ai/v1/crawl/research \
-X POST \
-H "Authorization: Bearer fc_live_xxx" \
-H "Content-Type: application/json" \
-d '{
"query": "AI agent market analysis",
"sources": ["substack"],
"limit": 10
}'
```
```ts
const results = await fc.research({
query: "AI agent market analysis",
sources: ["substack"],
limit: 10,
});
console.log(results.all.map((item) => item.url));
```
```python
results = fc.research(
"AI agent market analysis",
sources=["substack"],
limit=10,
)
print([item.url for item in results.all])
```
```json
{
"tool": "faircrawl_research",
"arguments": {
"query": "AI agent market analysis",
"sources": ["substack"],
"limit": 10
}
}
```
Notes
- use Substack for publication discovery and topical newsletter scans
- scrape one known newsletter post directly when you already have the URL