OpenRouter for Agent Tools: 3 Kinds of Tool Router Compared

Quick answer: An "OpenRouter for agent tools" is one account, one key and one prepaid balance that let an AI agent call thousands of paid APIs, paying per call. Monid (monid.ai) and treg (treg.to) are the two products built on exactly that pitch. The label also gets stuck on two other things: app-integration layers like Composio, and MCP gateways.

Checked against each vendor's own pages on November 5, 2026. Prices and catalogue sizes in this category change monthly.

What is an "OpenRouter for agent tools"?

It is a marketplace your agent shops in. You give it one credential and one balance, and it can call SEO data, people search, scrapers, social data or video models from many vendors without you signing up to each one.

The name borrows from OpenRouter, which gives developers one API key for hundreds of language models and bills per token. Monid's homepage puts the idea in one line: "OpenRouter did it for models: one key, every model, pay per token. Monid does it for tools: one skill, every tool, pay per call."

If you need a refresher on what MCP and tools are, start there. This page is about the services that sit behind them.

The category is new. Monid's launch posts are dated August 20, 2026, and treg's comparison pages say they were last checked November 5, 2026. Expect new entrants and renamed features every month.

Which kind of tool router do you need?

Pick by the job, not the label. If the agent needs data you don't pay for, you want a pay-per-call router. If it has to act inside your own Gmail, Slack or GitHub, you want an app-integration layer. If you're a platform team putting rules around servers you already run, you want a gateway.

• Pick a pay-per-call router (Monid, treg) if your agent does research: keyword volumes, backlinks, contact enrichment, TikTok trends, company data. Otherwise you'd pay for a whole monthly seat to run it a few times (treg's homepage lists Moz at $99 and Semrush at $139 a month).
• Pick an app-integration layer (Composio, Pipedream, Zapier MCP, Arcade) if your agent sends email, files tickets or updates a CRM as you, or as each of your users.
• Pick an MCP gateway if you already have a dozen MCP servers and need one endpoint, sign-in, access rules and an audit log in front of them.
• Use two if you need both. A sales agent might pull enrichment through treg and write to HubSpot through Composio.

How do Monid and treg compare?

They sell the same thing: other companies' paid APIs, metered from one prepaid balance. The differences are in how your agent connects, how much you can see before signing up, and what happens to your own keys.

What we tested on November 5. treg's public catalogue search (/catalog/search?q=backlinks) returned 47 matches with no account. Each came with a listed price and a measured success rate. Monid's CLI (version 0.1.9) installed fine, but monid discover stopped at "No active API key" until you create one.

treg also publishes side-by-side pages against Monid, Composio, Smithery and others. They're useful, and they're written by a vendor.

Does a tool router pick the provider for you?

Sometimes, and you should know which calls do. OpenRouter picks and falls back between model providers for you. Tool routers mostly show you the options and let the agent choose, with a few exceptions.

treg has two kinds of call:

1. Direct calls go to the one provider you name, such as dataforseo… or moz…, at that provider's rate.
2. Routed tools, named treg.<job>, try your team's own key first, then the cheapest provider. They move to the next one on an error or an empty result, up to a default cap of $1 per call. treg's own agent guide warns that a miss can still be billed, and its routed backlinks tool lists $0.000179 to $0.024 per hit across three providers.

Monid shows the agent each source's live price and says it "routes to the cheapest one that does the job". In practice the agent reads the prices and picks.

The practical rule: set a spending cap, and read the price your router quotes before each call. Don't assume it failed over on its own.

Are Composio, Pipedream, Zapier MCP and Arcade tool routers too?

They are something else that gets the same label. These layers connect an agent to your accounts, or your users' accounts, and handle the OAuth sign-in. They don't rent you data you have no account for. If you came here looking for Composio alternatives, this is the table.

If you want the integration code in your own repository instead of a hosted catalogue, Nango is the usual alternative people name.

Disclosure: Bento's agents connect to apps through Composio. The Search Console numbers we used to research this page came through that connection.

What's the difference between a tool router, an MCP router and an MCP gateway?

An MCP router (or MCP aggregator) puts many MCP servers behind one endpoint and one combined tool list. An MCP gateway is a router plus sign-in, access rules and audit logs. Neither comes with a catalogue of paid APIs. You bring the servers.

One recent change: Smithery shut down its proxy on October 31, 2026. Its hosted server URLs, API, CLI and accounts stopped working. It now stays a public directory that links straight to each vendor's own server.

How do you add a tool router to Claude Code, ChatGPT or Claude?

Most connect as a remote MCP server, so it's one command or one settings screen. Here is what we ran in Claude Code (version 2.1.310) on November 5:

claude mcp add --transport http treg https://treg.to/mcp/
claude mcp list
# treg: https://treg.to/mcp/ (HTTP) - ! Needs authentication

"Needs authentication" is the expected next step. Inside Claude Code, run /mcp and pick the server to finish treg's OAuth sign-in. We stopped there and didn't create an account.

Watch the trailing slash. Without it (https://treg.to/mcp, the form treg's docs page shows), the health check failed with "Protected resource https://treg.to/ does not match expected https://treg.to". The slashed URL is the one in treg's llms.txt.

Monid also has a remote MCP server (https://mcp.monid.ai/v1, which we didn't test). Or you tell the agent to set up https://monid.ai/SKILL.md; it installs the CLI and asks you for an API key.

For the full per-client steps:

• Claude Code: see adding MCP servers to Claude Code.
• ChatGPT: see giving ChatGPT more tools.
• Claude on the web and desktop: see Claude connectors worth adding.

What should you check before connecting one?

Check who holds the keys and who pays when a call misses. Everything else is catalogue size.

1. Whose credentials run the call. Pay-per-call routers use theirs. Integration layers store yours. Anything holding your OAuth tokens is a target: Composio disclosed a breach in May 2026 covering about 0.3% of active connections, and says it has since added token redaction and scoped API keys.
2. What a miss costs. Fall-through routing can bill more than one provider for one answer. Find the cap setting before the agent finds it.
3. What happens to your own keys. treg runs them through unmetered. Monid's skill tells the agent to use them directly instead.
4. Spend limits in dollars. Look for budgets and per-run caps, not just a balance.
5. How the agent finds tools. A router with thousands of endpoints works through search. Claude Code now loads MCP tool definitions on demand by default ("tool search"), so one big router doesn't fill the context window the way a dozen small servers used to.
6. Lock-in. Monid and treg are open source. Composio, Pipedream, Zapier and Arcade are hosted products with free tiers.

When don't you need a tool router?

Skip it if your agent uses one or two APIs. Call them directly with your own keys, because a router adds a balance to watch and a third party in every request. Skip it too if your agent can write and run code. Often it's simpler to let the agent write code instead of wiring more tools.

And skip it if you don't want to build the agent at all. Bento isn't a router for your own agent code. It's the version where the wiring is already done.

Bento's agents work in a workspace that already browses the web, researches people and companies, and connects to "Gmail, Slack, Notion and thousands more apps" (those app connections run on Composio). You ask for the work in plain words, and the agent picks the tool. There are no per-vendor keys to collect and no separate balance to top up.

The same subscription makes the posts, videos, voiceovers and apps around that work, and Bento always picks the best AI for each job: Starter is $20 a month, Pro $50 a month and Max $200 a month, with a 7-day free trial (checked November 5, 2026). The catch: if you're shipping your own agent product, you still need a router or integration layer inside your code. See Bento's plans.

Frequently Asked Questions

Is there an OpenRouter for tools?

Yes. Monid (monid.ai) and treg (treg.to) both describe themselves that way: one account and one prepaid balance for thousands of paid APIs, billed per call. Both are open source, and both are new: Monid's launch posts are dated August 2026.

Is Composio an OpenRouter for tools?

Not in the same sense. Composio connects an agent to apps in your own accounts, or your users' accounts, and handles OAuth. Its feature once called "Tool Router" is now called Sessions. It doesn't resell other vendors' paid data.

What is an MCP router?

It's a service that sits between an AI client and several MCP servers. It exposes them as one endpoint with one combined tool list and sends each call to the right server. "MCP aggregator" means the same thing. Add sign-in, access rules and logging and it's called an MCP gateway.

Is OpenRouter itself a tool router?

No. OpenRouter routes prompts to language models from many providers. It's the model-side idea that tool routers copy, not a catalogue of third-party tools.

Are tool routers free?

Most have a free start, then charge for use. On November 5, 2026: treg gave $1.00 of free credit, Composio's Hobby plan included 100,000 tool calls a month, and Arcade's free plan 2,000. Monid has no subscription; you top up a wallet from $5.

Is Smithery still an MCP proxy?

No. Smithery shut down its proxy and managed identity on October 31, 2026. It remains a public directory of MCP servers that links to each vendor's own server URL.