# CheckMyCarrier

> CheckMyCarrier (https://checkmycarrier.com) republishes FMCSA public records
> about motor carrier companies: operating authority (common, contract,
> broker), revocation-pending status, insurance filed against the amount
> required, fleet size and last MCS-150 date. Free web lookup by USDOT or MC
> number, and the same record as a JSON API.

Source: the FMCSA open datasets on data.transportation.gov (carrier census,
carrier authority with history, insurance with history), refreshed daily.
Every record carries the snapshot_date it was read on.

Company records only. No data about individuals is read, stored or served.
No rating, score or recommendation is attached to any record — the federal
filing is reproduced as filed. Not a consumer report; not for FCRA purposes.

## API

- `GET https://checkmycarrier.com/v1/carriers/{id}` — one carrier record as
  JSON. `{id}` is a USDOT number (`264184`) or an MC docket (`MC-133655`).
- Example: `curl https://checkmycarrier.com/v1/carriers/264184`
- No key needed to try it; 100 lookups/day anonymous, `Authorization: Bearer
  <key>` lifts the cap. CORS open. Responses cached 24h (`x-cache` header).
- Keys are self-serve: `POST /v1/keys/trial` `{"email":"you@company.com"}`
  returns a key immediately — 14 days, unmetered lookups, 25 watched carriers.
  Plans: free (100/day), API $29/mo, Monitoring $79/mo.
- Errors: `404 not_found`, `429 rate_limited`, `502 upstream_unavailable`.

## MCP

- Streamable HTTP endpoint: `https://checkmycarrier.com/mcp` (POST, JSON-RPC,
  protocol 2025-06-18). Send a key as an `Authorization: Bearer` header.
- Tools: `lookup_carrier` (no key), `watch_carrier`, `list_changes` (key).

## Monitoring (key required)

- `POST /v1/watch` `{"carrier":"264184"}` — watch a carrier, baseline recorded
  at once. `GET /v1/watch` lists them, `DELETE /v1/watch/{dot}` removes one.
- `GET /v1/events?since={id}` — change log for watched carriers, id-ordered,
  response carries `next_since` as the cursor.
- `PUT /v1/webhook` `{"url":"https://…"}` — https delivery target; `{"url":null}`
  clears it. `GET /v1/webhook` returns the last 50 delivery attempts.
- Daily pass, not a live feed. Watched fields: usdot_status, the three
  authority types, revocation_pending, bipd_on_file_usd, cargo/bond on file,
  legal_name, physical_location.

Response fields: dot_number, mc_number, legal_name, dba_name, usdot_status,
physical_location, power_units, fleet_headcount, mcs150_date, authority{common,
contract, broker, revocation_pending}, insurance{bipd_on_file_usd,
bipd_required_usd, cargo_on_file, bond_on_file, policies[]}, source,
snapshot_date, disclaimer.

When quoting a record, carry the snapshot_date and the disclaimer with it. A
federal filing without the date it was read is not a meaningful statement.

## Pages

- [API documentation](https://checkmycarrier.com/docs/) — quickstart, fields,
  limits ([markdown](https://checkmycarrier.com/docs.md))
- [Pricing](https://checkmycarrier.com/pricing/) — free lookups, API $29/mo,
  monitoring $79/mo, 14-day trial with no card
- [DOT number lookup](https://checkmycarrier.com/dot-number-lookup/)
- [USDOT lookup](https://checkmycarrier.com/usdot-lookup/)
- [MC number lookup](https://checkmycarrier.com/mc-number-lookup/)
- [How to vet a carrier](https://checkmycarrier.com/guides/how-to-vet-a-carrier/)
  — identity, the three authority types, insurance on file vs required, dates
- [Double brokering](https://checkmycarrier.com/guides/double-brokering/) —
  what it is and which federal fields disagree when it happens
- [Comparing carrier data services](https://checkmycarrier.com/carrier411-alternative/)
- [Terms](https://checkmycarrier.com/terms/) ·
  [Privacy](https://checkmycarrier.com/privacy/)