Best AI Agent Integration Platforms
Short answer: there is no single best AI agent integration platform, because the five split on what you want to own. Metorial lists 500,000 free tool calls a month and Composio 100,000, against 2,000 on Arcade. Arcade centres on per-user authorization and Nango on code you own. Pipedream Connect lists 3,000+ APIs, counted differently.
This page covers five AI agent integration platforms, which some vendors call integration layers: Arcade, Composio, Metorial, Nango and Pipedream Connect, listed alphabetically, not ranked. Vendor claims are attributed, for example "per Metorial".
At a glance
AI agent integration platform features
| Tool | Catalog and MCP | Open source and hosting | Security and auth |
|---|---|---|---|
| Arcade | 8,000+ tools on its homepage; its docs say 7,500+ across 81 MCP servers (per Arcade). Tools are delivered as MCP servers. | The arcade-mcp framework is MIT licensed; the catalog is hosted. Enterprise can run in your VPC or air-gapped. | SOC 2 compliant (per Arcade). Delegated per-user authorization through your identity provider. SSO, RBAC and audit logs on Enterprise. |
| Composio | 1,500+ apps on its homepage (per Composio). Hosted MCP endpoint per session. | SDK repository is MIT licensed. Self-hosting is not listed. | SOC 2 Type II (per Composio). Managed auth with per-user connected accounts. SSO/SCIM on Enterprise. |
| Metorial | Counts vary across its own pages: 1,100+ MCP servers and 21,000+ tools on its homepage, and 1,200+ integrations on its GitHub README (per Metorial). One MCP URL works in clients. | Catalog is Apache 2.0; the engine is described as source-available. Its pages differ on whether self-hosting needs an Enterprise contract. | SOC 2 Type II and GDPR (per Metorial). Per-person OAuth, SAML SSO and SCIM; RBAC on Enterprise. |
| Nango | 1,000+ APIs on its docs (per Nango). MCP server and agent sessions. | Elastic License (source-available). Free self-hosting is limited to API auth and proxy; full self-hosting and bring-your-own-cloud on Enterprise. | SOC 2 Type II and HIPAA with a BAA (per Nango). OAuth, API keys and token refresh. |
| Pipedream Connect | 3,000+ APIs on its Connect docs (per Pipedream), 2,500+ on its managed auth page; its MCP server cites 10,000+ tools. Units differ from the others. | Components registry is source-available. Self-hosting is not mentioned. Workday says it closed its acquisition of Pipedream. | SOC 2 Type 2 and GDPR on all plans. SSO, SCIM and HIPAA on Business. |
AI agent integration platform pricing
The meters differ, so the plans do not compare directly. Arcade and Composio bill on tool calls, Composio also on trigger events, Metorial on tool calls and team seats, Nango on connections, compute hours and data transfer, and Pipedream on external users and usage credits.
| Tool | Free | Paid entry | Enterprise |
|---|---|---|---|
| Arcade | Free, $0. 2,000 tool calls a month, community support. | Team, $25 a month plus $0.01 per tool call. | Custom. Cloud, VPC or air-gapped. |
| Composio | Hobby, $0. 100,000 tool calls and 50,000 trigger events a month, 3 team members. Pauses at the cap. | Pro, $29 a month. $0.0003 per tool call and $0.003 per trigger event past the included amount. | Custom. SSO/SCIM, customer-managed keys. |
| Metorial | Dev, $0. 500,000 tool calls a month, 2 team members, 10 provider integrations. No production access. | Scale, $250 a month. 2,500,000 tool calls, 20 team members. $1 per 1,500 extra tool calls. | Custom. SOC 2 II, on-prem, RBAC and SSO (per its pricing page). |
| Nango | Free, $0. 10 connections, 10 compute hours, 10 GB a month. Hard-capped. | Pay-as-you-go, $50 a month with $50 of credits, then $0.29 per connection, $0.72 per compute hour, $0.50 per GB. | Custom. Self-hosting, bring your own cloud, SLA. |
| Pipedream Connect | Free, $0. Development only, no production environment. | Startup, $99 a month billed annually ($150 monthly). 100 external users included, then $2 each; 10,000 credits, then $0.012 each. | Business, custom. SSO, SCIM, HIPAA. |
Prices from arcade.dev/pricing, composio.dev/pricing, metorial.com/pricing, nango.dev/pricing and pipedream.com/pricing.
What it's like to use these five platforms
I found no independent head-to-head of these five, so what follows is one reviewer's read of how each is set up, priced and talked about. The quickest way to sort them is by what they ask you to own: the user's permissions, the tool catalog, the gateway, the code or the auth plumbing.
Arcade
Arcade's quickstart centres on the user. You need an account, an API key and a user ID, and a helper checks whether a tool needs authorization, prints a link for the user and waits. That is the product in miniature: agents acting for a specific person, with authorization through your identity provider (per Arcade). The open reports I found sit on the framework repository rather than the hosted service, and they involve the enterprise-flavoured parts, such as a blank Auth settings page in the dashboard and a Microsoft Entra ID authorization asking for a scope that cannot be changed, so test identity-provider setup early. The free plan's 2,000 calls a month is a small allowance for testing an agent that loops, and the pricing page does not say what happens at the limit.
Composio
Composio is the shortest path from nothing to an agent calling apps. You create a session for a user ID, and when a task needs an account the agent shares a Connect Link. You'll notice the quickstart carries a prompt for coding agents beside the human walkthrough, so expect to skim. The rough edges that show up publicly lean towards auth and connected accounts, such as an invalid-token error on valid connections for one tool and a connect error page that hides the provider's reason. They are individual reports, but it is where I would look first when something breaks. The free plan is generous at 100,000 tool calls a month, and it pauses at the cap instead of billing overage.
Metorial
Metorial's pitch is a gateway. You paste one MCP URL into a client, and it adds access policies down to single tools and a log of each call with the person's identity (per Metorial). It has JavaScript, TypeScript and Python SDKs and a CLI. The Dev plan is the most generous on calls at 500,000 a month, but it has no production access, one project, one environment and ten provider integrations, so it is for evaluating rather than shipping. Scale is $250 a month. Two things I would check before committing: its own pages give different catalog counts, and its pricing page lists on-prem self-hosting under Enterprise while its comparison page says self-hosting does not need an enterprise contract. Open reports on the repository concern error handling, with upstream rate-limit, availability and auth errors collapsed into one terminal failure and ordinary handler errors reaching the caller as a generic server error. If your agent has to retry on a rate limit, test that path.
Nango
Nango asks the most of you and gives you the most to own. The quickstart creates an agent session through POST /sessions that returns an MCP URL and a token, and the Logs tab shows each tool call, which is where I would debug. The product itself is TypeScript functions that you version like application code (per Nango), plus scheduled syncs. Self-hosting is where I would read carefully. Free self-hosting covers API auth and proxy only, full self-hosting is an Enterprise matter, and the open reports cluster there, including a connect link that sends users to Nango's cloud host and a request to clarify the self-hosted feature set. It is under the Elastic License, which is source-available, and early commenters objected to the open-source label. Feedback on its OAuth has been positive, including a report of a year of stable use, though that was about an earlier version of the product.
Pipedream Connect
Pipedream Connect's quickstart has nine steps, including a project, an OAuth client and a short-lived token for each end user. That is thorough rather than quick. The free tier is development only, so production starts at $99 a month billed annually. One public report says File Stash in development asks for an upgrade although the docs say all Connect features are available in development, so test anything you depend on. Workday says it closed its acquisition of Pipedream, and I found no hands-on reports of Connect in the public discussion of the deal, so ask about roadmap and pricing before you build on it.
Best AI agent integration platform by need
- Most free calls, hosted: Composio Hobby, or Metorial Dev (no production).
- Agents acting for real users: Arcade, for per-user authorization.
- Code you read, change and version: Nango.
- Managed auth across many APIs: Pipedream Connect, with production on a paid plan.
- MCP gateway with call logs: Metorial, after checking its self-hosting terms.
All five list a free plan, so running two on your real workload costs little.
What to check before you pick
- The billable unit. Tool calls, connections, external users and compute credits are not the same thing.
- Production access. Pipedream's free tier and Metorial's Dev plan exclude it.
- Self-hosting terms. Which plan includes it, and which features it leaves out.
- Who owns the code. Hosted catalog or functions you version yourself.
Where viaSocket fits
viaSocket also sells an integration layer; it is not part of this comparison. In short, it is an integration layer for SaaS products and AI agents with 2,300+ integrations. Your user connects through one OAuth popup, viaSocket stores and refreshes the tokens, keeps each user's connections separate, and handles monitoring, webhooks, polling and retries. Its free plan lists 100K tasks a month and unlimited connected accounts.
It suits teams that want ready-made connections and managed auth in one place. If you need to own every sync as code, Nango is the closer fit; if you need an air-gapped runtime, Arcade lists one.
Check out viaSocket →FAQ
Which AI agent integration platform has the biggest free plan?
By tool calls, Metorial's Dev plan lists 500,000 a month and Composio's Hobby plan 100,000, against 2,000 on Arcade's Free plan. Metorial's Dev plan has no production access, and Nango and Pipedream meter different things, so the plans do not compare directly.
Which ones can I self-host?
Nango's docs say free self-hosting covers API auth and proxy only, and list full self-hosting and bring-your-own-cloud on Enterprise. Arcade lists your VPC or air-gapped deployment on Enterprise. Metorial lists on-prem under Enterprise on its pricing page, while another page says no enterprise contract is needed. Composio's pricing page does not list self-hosting, and the Pipedream Connect docs do not mention it.
Do all five support MCP?
Each describes MCP support: Composio through a hosted endpoint per session, Arcade by delivering tools as MCP servers, Metorial as an MCP gateway, Nango through an MCP server, and Pipedream through an MCP server that cites 10,000+ tools.
Which ones are open source?
Composio's SDK repository and Arcade's arcade-mcp framework are MIT licensed, and Metorial's catalog is Apache 2.0. Nango is under the Elastic License, which is source-available, and Pipedream's components registry is described as source-available.
Is Pipedream owned by Workday?
Workday announced an agreement to acquire Pipedream, and its later release says Workday closed the acquisition.
Sources
- Arcade pricing, homepage, quickstart, GitHub, docs, GitHub issues
- Composio pricing, homepage, quickstart, GitHub, GitHub issues
- Metorial pricing, homepage, docs, Metorial's comparison, GitHub, GitHub issues
- Nango pricing, docs, quickstart, GitHub, GitHub issues, self-hosting docs
- Pipedream pricing, Connect docs, quickstart, Workday release, managed auth, GitHub issues
- Hacker News: Nango launch thread, Hacker News: Workday and Pipedream thread