# Tethered Trust

> Compatibility intelligence for AI agents: check that a part, accessory or appliance fits *before* buying it. Answers come from a curated compatibility graph and deterministic rules, with evidence and a confidence score. AI is only used to read specs of products the graph doesn't know yet.

Website: https://tetheredtrust.com  ·  Operator: Chimes In LLC  ·  Contact: hello@chimes-in.com

## Connect
- MCP (Streamable HTTP, stateless): https://tetheredtrust.com/mcp
- HTTP API: https://tetheredtrust.com/v1 (JSON description of every operation)
- Free during the launch, no key needed. An API key (`Authorization: Bearer tt_...`) raises rate limits.

## Operations

### GET /v1/how-it-works  (MCP tool: `how_it_works`)
What Tethered Trust is, what it covers, and how an assistant should use it before a purchase.
Price: free

### GET /v1/resolve?query=  (MCP tool: `resolve_product`)
Look up a product in the Tethered Trust graph by name or model number and get its structured specs.
Price: free

### POST /v1/check  (MCP tool: `check_compatibility`)
Will this exact part work with that exact device? RAM, M.2 SSDs, USB-C chargers and appliance parts. Returns compatible / incompatible / uncertain with confidence, the rules checked, caveats and evidence.
Price: free during the launch (planned $0.03 per call)

### POST /v1/parts  (MCP tool: `find_parts`)
Which parts fit this model? The OEM part and verified alternatives (e.g. a refrigerator's water filter), or every RAM, SSD and charger in the graph that fits a computer.
Price: free during the launch (planned $0.05 per call)

### POST /v1/fit  (MCP tool: `check_fit`)
Will this appliance physically fit this space? Compares dimensions plus typical installation clearances and required connections.
Price: free during the launch (planned $0.03 per call)

### POST /v1/outcome  (MCP tool: `report_outcome`)
After a purchase, report whether it actually fit. Free; it becomes evidence for future answers.
Price: free

## Terms
Use is subject to the Terms of Service (https://tetheredtrust.com/terms) and the API & Agent Terms (https://tetheredtrust.com/api-terms). Answers are informational: present caveats and confidence honestly, and tell people to confirm with the manufacturer before buying or installing. Privacy: https://tetheredtrust.com/privacy.

## How to use it well
- Pass exact model numbers when you have them. "ThinkPad T480" beats "Lenovo laptop".
- Respect the verdict: `needs_detail` comes with a `missing` list of what to ask the person.
- `verified: false` means some specs came from the person's text or from AI; say so.
- After the purchase, call `report_outcome`. It's free and improves future answers.