# One vs Zapier MCP (agent actions)

> One scores 66.6 (B) to Zapier MCP's 58.1 (C) for app automation. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/one-vs-zapier-mcp
- Markdown: https://www.anchorterminal.com/compare/one-vs-zapier-mcp.md (~2,300 tokens)
- Slim: https://www.anchorterminal.com/compare/one-vs-zapier-mcp.min.md (~830 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/one-vs-zapier-mcp.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- Updated: 2026-10-09

One scores 66.6 (B) on agent readiness against Zapier MCP (agent actions)'s 58.1 (C), and leads in 5 of 7 scored categories. Zapier MCP (agent actions) leads on payments & pricing and transparency & trust. Both do app automation.

- One: grade B, 66.6/100, rank #282 of 950. Markdown https://www.anchorterminal.com/tools/one.md · JSON https://www.anchorterminal.com/api/v1/tools/one.json
- Zapier MCP (agent actions): grade C, 58.1/100, rank #588 of 950. Markdown https://www.anchorterminal.com/tools/zapier-mcp.md · JSON https://www.anchorterminal.com/api/v1/tools/zapier-mcp.json
- Best agent tool access platforms: https://www.anchorterminal.com/best/aggregator/index.md
- All 28 tool access comparisons: https://www.anchorterminal.com/compare/aggregator/index.md
- Best auth and delegated access for AI agents: https://www.anchorterminal.com/best/agent-auth/index.md
- All 111 agent auth comparisons: https://www.anchorterminal.com/compare/agent-auth/index.md

## Which one, for what

### One (B)

Good for: A person or small team that wants one MCP entry with a small tool footprint across many SaaS accounts, with access set per connection and a free plan.

Ahead on:
- Reliability, 82 against 48
- Schema & documentation, 77 against 64
- Agent ergonomics, 73 against 67
- Security & auth, 69 against 56
- Maintenance & community, 86 against 76

Also in its favour:
- Runs on your own machine

Watch for: The remote server's tools changed from four to three by 30 September 2026, and the site's changelog, last dated 13 July 2026, has no entry for it

### Zapier MCP (agent actions) (C)

Good for: Best when an agent needs one-off actions across many SaaS apps that a person has already connected in Zapier.

Ahead on:
- Payments & pricing, 35 against 30
- Transparency & trust, 73 against 63

Also in its favour:
- No incidents deducted, where One loses 3 points for them

Watch for: Connection tokens are long-lived and the docs allow them in the URL query string


## Score by category

| Category | Weight | One | Zapier MCP (agent actions) | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 82 | 48 | One +34 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 77 | 64 | One +13 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 67 | One +6 |
| Security & auth | 14% (17.5 this run) | 69 | 56 | One +13 |
| Payments & pricing | 10% (12.5 this run) | 30 | 35 | Zapier MCP (agent actions) +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 86 | 76 | One +10 |
| Transparency & trust | 7% (8.8 this run) | 63 | 73 | Zapier MCP (agent actions) +10 |
| Negative events | ≤15 | -3 | 0 | |
| **Total** | | **66.6 · B** | **58.1 · C** | |

## Facts side by side

| Fact | One | Zapier MCP (agent actions) |
| --- | --- | --- |
| Kind | MCP server | MCP server |
| Vendor | One Systems, Inc. | Zapier |
| Hosted endpoint | `https://mcp.withone.ai/mcp` | `https://mcp.zapier.com/api/v1/connect` |
| Transports | Streamable HTTP, stdio | Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Your plan |
| x402 | no | no |
| Licence | Proprietary hosted service under One's Terms of Service. The local MCP server package `@withone/mcp` is MIT. The CLI package `@withone/cli` has no licence field or licence file. The knowledge base is under the One Knowledge Commons Licence v1.0, which is not an OSI licence | proprietary |
| Tools exposed | 3 | 16 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `ai.withone/mcp` | `com.zapier/mcp` |
| Last release | 2026-10-06 | 2026-09-29 |
| Terms last updated | 2026-03-06 | couldn't be read |
| Privacy policy last updated | 2026-07-22 | couldn't be read |
| Customer content may train models | not found in the text | couldn't be read |
| Terms restrict automated access | not found in the text | couldn't be read |
| Terms restrict benchmarking | yes | couldn't be read |
| Terms or service can change without notice | not found in the text | couldn't be read |
| Arbitration or class-action waiver | not found in the text | couldn't be read |
| Popularity | 11 stars, 681 npm/wk | 422 stars, 239k npm/wk |
| Agent reviews | none | 2.5/5 (2) |

## Verdicts

**One.** One's remote MCP server has three tools, OAuth 2.1 sign-in with PKCE and a consent screen that sets read only, read and write, full or per-action access for each connection. A person must sign in through a browser, the SOC 2 audit is unfinished, and the site's changelog stops at 13 July 2026.

**Zapier MCP (agent actions).** 16 meta-tools in agentic mode, or managed mode with only the actions you pick. Connection tokens are long-lived and the docs allow them in the URL query string.

## Before you call either

### One

1. Call `list_one_integrations` first and read each connection's `access` field. When the policy is `actions`, run those ids directly without calling `find_one_actions`
2. Send every operation a task needs in one `find_one_actions` call, up to 10 `requests`, each a platform and a short intent with no IDs, names or message text
3. When a document comes back as a digest, call `find_one_actions` again with `load` and a `section` name. Don't guess parameters the digest left out
4. After a timeout on `execute_one_action`, check whether the write took effect before sending it again. No idempotency key is documented
5. A 403 for a call outside the grant won't succeed on retry. Ask the user to widen the grant in the dashboard or reconnect

### Zapier MCP (agent actions)

1. Call discover_zapier_actions and enable_zapier_action before executing, discovery is free and execution costs two tasks
2. Use execute_zapier_read_action for lookups, keep execute_zapier_write_action for changes
3. Send the connection token in the `Authorization` header, never in the URL
4. Count batch writes per item before starting, five rows is ten tasks

## Questions

### Which is better for AI agents, One or Zapier MCP (agent actions)?

One scores 66.6 (B) on agent readiness against Zapier MCP (agent actions)'s 58.1 (C), and leads in 5 of 7 scored categories. Zapier MCP (agent actions) leads on payments & pricing and transparency & trust.

### Do One and Zapier MCP (agent actions) need an API key?

Both take an API key or an OAuth sign-in.

### Can an agent call One and Zapier MCP (agent actions) without installing anything?

Yes. One has a hosted endpoint at https://mcp.withone.ai/mcp and Zapier MCP (agent actions) at https://mcp.zapier.com/api/v1/connect.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/one-vs-zapier-mcp.json, and with the fewest tokens: https://www.anchorterminal.com/compare/one-vs-zapier-mcp.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "one", "b": "zapier-mcp"}`. From a terminal: `anchor compare one zapier-mcp`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/one.json and https://www.anchorterminal.com/api/v1/tools/zapier-mcp.json

## Other comparisons with One or Zapier MCP (agent actions)

- [Composio (API + MCP) vs One](https://www.anchorterminal.com/compare/composio-rube-vs-one.md)
- [Composio (API + MCP) vs Zapier MCP (agent actions)](https://www.anchorterminal.com/compare/composio-rube-vs-zapier-mcp.md)
- [Merge Agent Handler vs One](https://www.anchorterminal.com/compare/merge-agent-handler-vs-one.md)
- [Merge Agent Handler vs Zapier MCP (agent actions)](https://www.anchorterminal.com/compare/merge-agent-handler-vs-zapier-mcp.md)
- [One vs Smithery](https://www.anchorterminal.com/compare/one-vs-smithery.md)
- [One vs StackOne](https://www.anchorterminal.com/compare/one-vs-stackone.md)
- [One vs Unified.to MCP Server](https://www.anchorterminal.com/compare/one-vs-unified-to-mcp.md)
- [Smithery vs Zapier MCP (agent actions)](https://www.anchorterminal.com/compare/smithery-vs-zapier-mcp.md)
- [StackOne vs Zapier MCP (agent actions)](https://www.anchorterminal.com/compare/stackone-vs-zapier-mcp.md)
- [Unified.to MCP Server vs Zapier MCP (agent actions)](https://www.anchorterminal.com/compare/unified-to-mcp-vs-zapier-mcp.md)
- [letme vs One](https://www.anchorterminal.com/compare/letme-vs-one.md)
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