treg.to / Catalog / The Companies API
5 tools · 4 platform + BYOK · 1 BYOK only

The Companies API: 5 tools, platform or your own key

Firmographics and technology-stack detection across ~50M companies. 4 tools support treg's platform key. All 5 support your own The Companies API key; 1 require it. Your own key always wins and treg does not meter those calls.
Start freeSee all 5 toolsAPI docs ↗
$1.00 of free credit once per new verified account · no card · platform tools need no provider signup
works in
ChatGPTClaudeClaude CodeCodexCursorGrokGemini CLI
What your agent can now do

The Companies API, one prompt away

AGENT
ChatGPTClaudeClaude CodeCodexCursorGrokGemini CLI
enrich a company from its domain or name✓
search companies by industry, size or tech — account lists for lead generation✓
find a company's work-email format✓
→
▚ treg
$ treg call thecompaniesapi.companies.enrich
✓ 200 · $0.0019/success
$ treg call thecompaniesapi.companies.search
✓ 200 · $0.0019/result
$ treg call thecompaniesapi.companies.email_pattern
✓ 200 · $0.0019/success
$ _
→
The Companies APIPLATFORM + BYOK
Firmographics and technology-stack detection across ~50M companies.
⚒ 5 TOOLS · platform + BYOK

Enrichment · https://api.thecompaniesapi.com/v2

Set up

Set up The Companies API in Claude Code, Codex or any agent

1Give this to your agent
in your agent's chat
set up treg — https://treg.tracea.online/llms.txt
2Or add the MCP server yourself
claude code
claude mcp add --transport http treg https://treg.tracea.online/mcp

ChatGPT

Settings → Connectors → add https://treg.tracea.online/mcp as a custom connector.

Grok bot

Add https://treg.tracea.online/mcp as a remote MCP connector in its tool settings.

Claude Desktop

Settings → Connectors → Add custom connector → https://treg.tracea.online/mcp.

Cursor, Codex, any MCP client

Point it at https://treg.tracea.online/mcp (HTTP transport).

CLI

curl -fsSL https://treg.tracea.online/install.sh | sh

Plain HTTP

LangChain, CrewAI or any code: /call/<tool-id> + X-Treg-Token: <token>. No SDK.

Try it

What's the best way to ask?

the prompt
Using treg, enrich a company from its domain or name. Show me the price first.

Run one directly

a call
treg call thecompaniesapi.companies.enrich --query domain=stripe.com
Why treg.to

Why call The Companies API through treg.to

No The Companies API signup

Eligible tools run on treg.to's key, metered per call from a prepaid balance.

Price before the call

The provider's own rate, $0.000 markup. How billing works.

No subscription, no seats

Platform calls are charged per call. $1.00 free per new team, no card to start.

Your own The Companies API key is free

Register it and those calls are never metered. Your key always wins.

Switch by changing a word

Another provider is a different word in the prompt, not a new integration.

One key, the whole catalog

The same token calls AI Ark, Akta by Wokelo, Apollo.io and 3,276 other tools.

The shelf

All 5 The Companies API tools

Company data · 4 tools
  • A company's email address patterns by domain · Platform + BYOK · $0.0019/success
    Find which email-address formats a company uses, and how common each one is thecompaniesapi.companies.email_pattern
    1 credit per request.
  • Enrich a company by domain — 80+ datapoints · Platform + BYOK · $0.0019/success
    Enrich a company from its domain — 80+ datapoints: industry, size, revenue, socials thecompaniesapi.companies.enrich
    1 credit per company found; nothing when not found. `simplified=true` is free; `refresh=true` adds 10 credits. Dollar value depends on plan (500 free credits on signup).
  • Enrich the company behind an email address · Platform + BYOK · $0.0019/success
    Identify and enrich the company behind an email address thecompaniesapi.companies.enrich_by_email
    1 credit per company found. VERIFIED live 2026-08-13: the response body reports its own accounting — a by-email enrich returned meta.cost 1 (with meta.credits showing the remaining balance), confirming 1 credit per matched company.
  • Search companies by industry, size, location or tech · Platform + BYOK · $0.0019/result
    Search companies by industry, size, location, technology or any other attribute filter thecompaniesapi.companies.search
    1 credit PER COMPANY RETURNED, so `size` is the price. `simplified=true` makes the whole call free.
The provider account itself — usage, quota, balance (not a content platform) · 1 tools
  • Check API token validity · BYOK only · helper · No treg charge; upstream free
    Check the Companies API token works, without spending a credit thecompaniesapi.account.usage
    free because of simplified=true; auth is still required, so a bad token is rejected

Reliability badges come from live traffic through treg.to. Live-verified means a successful provider check; it does not verify every request variant.

Used in

Jobs The Companies API does, compared with the other providers

Company enrichment API: domain to firmographics, providers compared on price and fill

Every provider that does this job, side by side: price per billing unit, measured success rate and speed.

Company email format finder: the pattern a domain uses, so a name becomes an address

Every provider that does this job, side by side: price per billing unit, measured success rate and speed.

Companies by industry: build a company list by industry, size, location or tech stack through one key

Every provider that does this job, side by side: price per billing unit, measured success rate and speed.

Related

Same jobs, other providers

These providers answer some of the same capabilities as The Companies API. The platform pages show them on one row with rate and coverage; choosing is yours, treg.to does not route between providers automatically.

also on the catalog
AI ArkAkta by WokeloApollo.ioAviatoContext.devBright DataCompanyEnrichContactOutCoresignalCrunchbaseCrustdataDatagma
Questions

Before you start

Do I need a The Companies API account?

For 4 platform tools, no. The other 1 require your own The Companies API key. All 5 accept your own key, and treg never meters BYOK calls.

What does a call cost?

Each tool on this page shows its rate; the cheapest is $0.0019/success. The rate is the provider's own and treg.to adds no markup; it is billed per call from a prepaid balance. It is not The Companies API's subscription pricing, which is on their own site. New teams start with $1.00 of free credit.

How do I add The Companies API to Claude Code?

Run: claude mcp add --transport http treg https://treg.tracea.online/mcp. One MCP server carries The Companies API and the rest of the catalog.

Which frameworks does it work with?

Anything that speaks MCP (Claude Code, Claude Desktop, ChatGPT, Codex, Cursor, Grok) and anything that can make an HTTP request (LangChain, CrewAI, LlamaIndex, plain code).

Is this the official The Companies API MCP server?

No. treg.to serves The Companies API's real API through its own metered proxy: the request is the provider's own, the credential is injected server-side, and the answer is relayed verbatim. The official The Companies API channels are linked above.