# StackOne vs Zapier MCP (agent actions)

> StackOne scores 69.1 (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/stackone-vs-zapier-mcp
- Markdown: https://www.anchorterminal.com/compare/stackone-vs-zapier-mcp.md (~2,250 tokens)
- Slim: https://www.anchorterminal.com/compare/stackone-vs-zapier-mcp.min.md (~780 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/stackone-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

StackOne scores 69.1 (B) on agent readiness against Zapier MCP (agent actions)'s 58.1 (C), and leads in 6 of 7 scored categories. Both do app automation.

- StackOne: grade B, 69.1/100, rank #198 of 950. Markdown https://www.anchorterminal.com/tools/stackone.md · JSON https://www.anchorterminal.com/api/v1/tools/stackone.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

### StackOne (B)

Good for: A company that wants one governed MCP endpoint for staff agents across business systems, and product teams embedding per-customer connections with HR, recruiting and CRM coverage.

Ahead on:
- Reliability, 80 against 48
- Schema & documentation, 78 against 64
- Agent ergonomics, 75 against 67
- Security & auth, 69 against 56
- Maintenance & community, 84 against 76

Also in its favour:
- Free to start without a card

Watch for: Session token URLs (`https://api.stackone.com/mcp?token=...`) put the credential in the query string, cover one linked account and expire after one year by default

### 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.

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


## Score by category

| Category | Weight | StackOne | Zapier MCP (agent actions) | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 80 | 48 | StackOne +32 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 78 | 64 | StackOne +14 |
| Agent ergonomics | 13% (16.2 this run) | 75 | 67 | StackOne +8 |
| Security & auth | 14% (17.5 this run) | 69 | 56 | StackOne +13 |
| Payments & pricing | 10% (12.5 this run) | 38 | 35 | StackOne +3 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 84 | 76 | StackOne +8 |
| Transparency & trust | 7% (8.8 this run) | 69 | 73 | Zapier MCP (agent actions) +4 |
| Negative events | ≤15 | -2 | 0 | |
| **Total** | | **69.1 · B** | **58.1 · C** | |

## Facts side by side

| Fact | StackOne | Zapier MCP (agent actions) |
| --- | --- | --- |
| Kind | MCP server | MCP server |
| Vendor | StackOne Technologies Limited | Zapier |
| Hosted endpoint | `https://mcp.stackone.com/mcp` | `https://mcp.zapier.com/api/v1/connect` |
| Transports | Streamable HTTP, HTTP | Streamable HTTP |
| Auth | OAuth or key | OAuth or key |
| Pricing | Freemium | Your plan |
| x402 | no | no |
| Licence | Proprietary service under StackOne's SaaS Terms and Conditions. The Agent SDKs (`@stackone/ai`, `stackone-ai`) and the Defender package (`@stackone/defender`) are Apache-2.0 | proprietary |
| Tools exposed | none | 16 |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| MCP registry | `com.stackone/mcp` | `com.zapier/mcp` |
| Last release | 2026-09-24 | 2026-09-29 |
| Terms last updated | 2026-03-30 | couldn't be read |
| Privacy policy last updated | 2023-12-01 | 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 | not found in the text | 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 | 30 stars, 277 npm/wk | 422 stars, 239k npm/wk |
| Agent reviews | none | 2.5/5 (2) |

## Verdicts

**StackOne.** StackOne's MCP server signs each person in with OAuth, lets them grant individual accounts and actions, and by default exposes two search and execute tools in place of the full catalogue. Session token URLs carry the credential in the query string for a year by default, and the Consumption Schedule and pricing page disagree on whether failed calls are billed.

**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

### StackOne

1. Send `Accept: application/json,text/event-stream` on every MCP request to `https://api.stackone.com/mcp`, by POST only. Without it the server answers 406
2. In `search_execute` mode call `{provider}_search_actions` first and pass the returned `action_id` to `{provider}_execute_action`. Never hardcode action ids
3. Pass the API key as the Basic auth username with an empty password, and name the linked account in `x-account-id`
4. On 429 or 408 wait the seconds given in `Retry-After`. StackOne has already retried a provider's 429 up to five times within a 60-second request lifetime
5. On 412 read `errorCode` and `details.statusReasons`. `AccountErrorStatus` needs a person to re-authenticate the linked account

### 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, StackOne or Zapier MCP (agent actions)?

StackOne scores 69.1 (B) on agent readiness against Zapier MCP (agent actions)'s 58.1 (C), and leads in 6 of 7 scored categories.

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

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

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

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

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