Developers and agents

# RFP Software Tools developer resources

The RFP Software Tools Public API exposes read-only directory data for agents, research tools, and software that needs a structured list of published RFP, DDQ, and security-questionnaire products. The API is available without authentication. Use the human-readable pages when you need full editorial context and source notes.

[**OpenAPI 3.1**Typed operations and response schemas](/openapi.json)[**llms.txt**When-to-use instructions and curated links](/llms.txt)[**Sitemap**Complete indexable page inventory](/sitemap-index.xml)

## Authentication and usage

No API key, cookie, or authorization header is required. Endpoints are static, cacheable, and updated with the published directory. Clients should cache responses, avoid unnecessary repeated requests, and follow the canonical URLs returned in each record when more context is required.

## Endpoints

- `GET /api/v1/site.json` returns site identity and discovery links.
- `GET /api/v1/vendors.json` returns the published vendor catalog.
- `GET /api/v1/categories.json` returns categories and member vendors.

## Example request

```
curl -sS -H "Accept: application/json" \
  https://rfp-software-tools.com/api/v1/vendors.json
```

## Markdown for agents

Public HTML pages support HTTP content negotiation. Send `Accept: text/markdown` to the same page URL to receive Markdown. Responses include `Vary: Accept` so shared caches keep HTML and Markdown separate. Start with [llms.txt](/llms.txt) to choose the most relevant profile, comparison, category, or guide.

## Error responses

Unknown API paths return `application/problem+json` with a stable error code, message, resolution hint, and documentation URL. Unknown content paths return HTTP 404\. Markdown clients receive a short Markdown recovery page with links to the sitemap, llms.txt, developer guide, and homepage.

```
{
  "error": {
    "code": "api_not_found",
    "message": "The requested API endpoint does not exist.",
    "resolution": "Use an endpoint declared in the OpenAPI document.",
    "documentation": "https://rfp-software-tools.com/developers"
  }
}
```

Questions about the data contract can be sent to [developers@rfp-software-tools.com](mailto:developers@rfp-software-tools.com).