Seller Auto Reply Developer Documentation
Developer portal for Seller Auto Reply: the Listings API reference, authentication, the OpenAPI description, and the machine-readable index for AI agents.
Seller Auto Reply is an independent AI auto-reply assistant for Facebook Marketplace sellers. Most people use it through the browser extension and the dashboard — these pages are for developers who want to manage listing context programmatically or point an AI agent at the product.
Developer resources
- Seller Auto Reply Listings API reference — every endpoint, with
request and response bodies and
curlexamples. - Authentication — how the
X-Unique-Keyheader works and where to find your key. - OpenAPI 3.1 description — machine-readable schema for the Listings API, ready to import into an HTTP client or a code generator.
- llms.txt — the agent index for this site, including when to reach for Seller Auto Reply.
- sitemap.xml — every indexable page.
Markdown for agents
Every public page on https://www.fbautoreplyai.com answers Accept: text/markdown with a clean
Markdown representation of the same URL, following the
acceptmarkdown.com convention:
curl -H "Accept: text/markdown" https://www.fbautoreplyai.com/pricing
Responses carry Content-Type: text/markdown; charset=utf-8 and
Vary: Accept, so a cached HTML variant is never handed to an agent that asked
for Markdown.
Support
Questions about the API go to support@fbautoreplyai.com or the contact page.