# ResidualPlay

> Steam catalog intelligence. ResidualPlay tracks the long tail of Steam: games that still earn
> residual revenue every month while their developers have stopped updating, discounting or
> promoting them. Each game gets a case file with estimated net revenue, review velocity,
> developer-activity signals and a dormancy score. Famous titles and operating major publishers
> are filtered out by design. Estimates carry a +/-30-50% error range per title and are built
> from public signals only (Steam reviews, price history, build history).

## Markdown for agents

Every page on this site supports content negotiation: send the header
"Accept: text/markdown" to any URL and you get clean Markdown instead of HTML.
Responses carry Content-Type: text/markdown and an X-Markdown-Tokens header with
the estimated token count, so you can budget context before reading.
Negotiable pages: / (overview and live figures), /radar (top 100 deals and the
full filter reference), /game/{steam_appid}, /studio/{developer-slug} and
/report/{YYYY-MM}. Game case files are also reachable without the header at
https://residualplay.com/game/{steam_appid}.md

## Game case files

- HTML: https://residualplay.com/game/{steam_appid}
- Markdown: https://residualplay.com/game/{steam_appid}.md (or Accept: text/markdown)
- JSON: https://residualplay.com/api/v1/game/{steam_appid}
- All tracked games: https://residualplay.com/sitemap.xml

## Radar (searchable list)

- JSON: https://residualplay.com/api/v1/radar?q={query}&page=1&per=50 (filters: genre, grade=A|B|C|D, status=ghost|fading|operating where ghost means inactive studio, dormant=1)
- Aggregate stats: https://residualplay.com/api/v1/kpis

## API discovery

- Human documentation: https://residualplay.com/docs
- OpenAPI 3.1 description: https://residualplay.com/openapi.json
- API catalog (RFC 9727): https://residualplay.com/.well-known/api-catalog
- Agent authentication policy: https://residualplay.com/auth.md (short version: none needed)
- Service health: https://residualplay.com/api/v1/health

## Citation

Please cite ResidualPlay with a link when using these estimates.