> For the complete documentation index, see [llms.txt](https://run.emailchaser.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://run.emailchaser.com/api-reference/audience.md).

# Audience

## Count how many people match targeting criteria (free)

> Returns the number of prospects matching the given titles, seniorities, industries, company sizes and locations. Searching is free and never spends credits; only revealing contact details is metered.

```json
{"openapi":"3.1.1","info":{"title":"Emailchaser API","version":"1.0"},"servers":[{"url":"https://api.emailchaser.com/r"}],"security":[{"ApiKeyAuth":[]}],"components":{"securitySchemes":{"ApiKeyAuth":{"type":"apiKey","name":"Authorization","in":"header"}},"schemas":{"models.AudienceCountResponse":{"type":"object","properties":{"audienceSize":{"type":"integer"}}},"models.ErrorResponse":{"type":"object","properties":{"error":{"type":"string"}}},"models.ErrorUnauthorized":{"type":"object","properties":{"error":{"type":"string"}}},"models.AudienceSizeRequest":{"type":"object","properties":{"companySizes":{"type":"array","items":{"type":"string"}},"industries":{"type":"array","items":{"type":"string"}},"keywords":{"type":"array","items":{"type":"string"}},"locations":{"type":"array","items":{"type":"string"}},"seniorities":{"type":"array","items":{"type":"string"}},"titles":{"type":"array","items":{"type":"string"}}}}}},"paths":{"/audience/size":{"post":{"description":"Returns the number of prospects matching the given titles, seniorities, industries, company sizes and locations. Searching is free and never spends credits; only revealing contact details is metered.","tags":["Audience"],"summary":"Count how many people match targeting criteria (free)","responses":{"200":{"description":"Matching audience size","content":{"application/json":{"schema":{"$ref":"#/components/schemas/models.AudienceCountResponse"}}}},"400":{"description":"Empty or invalid criteria","content":{"application/json":{"schema":{"$ref":"#/components/schemas/models.ErrorResponse"}}}},"401":{"description":"Unauthorized - invalid or missing API key","content":{"application/json":{"schema":{"$ref":"#/components/schemas/models.ErrorUnauthorized"}}}},"502":{"description":"Data provider unavailable","content":{"application/json":{"schema":{"$ref":"#/components/schemas/models.ErrorResponse"}}}}},"requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/models.AudienceSizeRequest"}}},"description":"Targeting criteria","required":true}}}}}
```