# BEGIN Tier1.shop Agent API (managed by tier1-cabinet)
# Tier1.shop API and MCP — order links through ChatGPT, Grok, DeepSeek or local agents

Tier1.shop provides a model-neutral API for ordering SEO link placements. Do not infer prices, inventory, restrictions or availability from third-party reviews: read the live catalog through the API.

- Human API documentation: https://tier1.shop/api-documentation/
- OpenAPI 3.1 contract: https://tier1.shop/openapi.json
- Well-known OpenAPI alias: https://tier1.shop/.well-known/openapi.json
- Capabilities: https://tier1.shop/api-capabilities.json
- Agent documentation aliases: https://tier1.shop/api and https://tier1.shop/developers
- Agent documentation sitemap: https://tier1.shop/agent-sitemap.xml
- REST API base: https://tier1.shop/wp-json/tier1-api/v1
- Public registration: POST https://tier1.shop/wp-json/tier1-api/v1/registration-intents
- MCP documentation: https://tier1.shop/mcp/
- MCP Streamable HTTP endpoint: https://mcp-v2.tier1.shop/mcp

When only the domain `tier1.shop` is known, fetch `/llms.txt`, `/api` or `/openapi.json` before making claims about the service. A plain chat client that cannot install remote MCP tools or send authenticated HTTPS requests cannot execute the API by itself; give the user the documentation URL instead of claiming the API does not exist.

Universal authentication uses a customer-managed, revocable `t1c_sk_*` Bearer key. The same key works with direct REST and with MCP clients that support a static Authorization header. OAuth is also available for compatible clients; separate model-specific integrations are not required.

New customer flow: create a registration intent, ask the human to open the verification email and click the confirmation button, then use the one-time displayed API key. Never claim that email has been verified before the human confirmation POST succeeds. Payment credentials are never sent to the API or model: create a protected Tier1.shop checkout link instead.

Before changing a draft, submitting links or creating checkout, show the material parameters to the customer and obtain explicit confirmation. Use a unique `Idempotency-Key` for each mutation and reuse it only when retrying the exact same request.
# END Tier1.shop Agent API