# ActiveCampaign vs Sequenzy

> Sequenzy scores 63.7 (B) to ActiveCampaign's 43.9 (E) for marketing audiences. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/activecampaign-vs-sequenzy
- Markdown: https://www.anchorterminal.com/compare/activecampaign-vs-sequenzy.md (~4,850 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-07

Sequenzy scores 63.7 (B) on agent readiness against ActiveCampaign's 43.9 (E), and leads in 6 of 7 scored categories. ActiveCampaign leads on reliability. Both do marketing audiences.

- ActiveCampaign: grade E, 43.9/100, rank #1240 of 1510. Markdown https://www.anchorterminal.com/tools/activecampaign.md · JSON https://www.anchorterminal.com/api/v1/tools/activecampaign.json
- Sequenzy: grade B, 63.7/100, rank #506 of 1510. Markdown https://www.anchorterminal.com/tools/sequenzy.md · JSON https://www.anchorterminal.com/api/v1/tools/sequenzy.json
- Best lifecycle marketing and customer engagement platforms for AI agents: https://www.anchorterminal.com/best/lifecycle-marketing/index.md
- All 66 lifecycle marketing comparisons: https://www.anchorterminal.com/compare/lifecycle-marketing/index.md
- Best email delivery APIs for AI agents: https://www.anchorterminal.com/best/email/index.md
- All 174 email comparisons: https://www.anchorterminal.com/compare/email/index.md

## Which one, for what

### ActiveCampaign (E)

Good for: Small and mid-sized teams already on ActiveCampaign that want an agent to maintain contacts, segments and campaign drafts and enrol contacts in automations.

Ahead on:
- Reliability, 52 against 38

Watch for: No readable incident history. The status page sits on ActiveCampaign's own domain, whose terms bar robots, and its earlier reading came from a data feed

### Sequenzy (B)

Good for: SaaS and ecommerce lifecycle email run from code or an agent, with billing-event triggers from Stripe, Paddle and others.

Ahead on:
- Schema & documentation, 95 against 68
- Agent ergonomics, 69 against 52
- Security & auth, 67 against 33
- Payments & pricing, 40 against 20
- Maintenance & community, 78 against 5
- Transparency & trust, 67 against 60

Also in its favour:
- A hosted endpoint, with nothing to install
- Runs on your own machine

Watch for: About 306 MCP tools, with no toolsets or dynamic loading found


## Why the edge

### Maintenance & community: Sequenzy +73

- ActiveCampaign (5): There is no changelog. On 8 October the `updatedAt` stamps on 46 of the 185 reference pages fell on 12, 13, 17 and 31 August and 2 September 2026 (per the 8 October check, not re-read on 4 November). The 8 October check recorded them as page revisions, not changelog entries, and no API change was recorded on those pages. Page dates that record no change don't set recency (as wrike, coinbase-mcp and agentweb), and the clients are years old, so no dated API change is readable (0). Page stamps aren't releases, so the 90-day line is 0. No public changelog. A community site and a developer relations email address are published, and we did not see reply times (5). The official PHP and Node.js clients are v1 wrappers last changed in December 2017 and March 2018 (0). No current package to assess (0). 0 + 0 + 5 + 0 + 0 = 5.
- Sequenzy (78): sequenzy 2.1.56, @sequenzy/mcp 0.0.246 and @sequenzy/cli 0.0.202 were all published on 6 November 2026 (30). 18 SDK, 105 MCP and 93 CLI releases in the 90 days from 8 August, and dated changelog entries on most days (20). A closed service with a public changelog and support answered by the cofounders per the about page. GitHub issues weren't read, as the GitHub API refused our requests for its rate limit (12 of 15). Listed in the official MCP registry as io.github.polnikale/sequenzy-mcp, but the entry is at 0.0.36 against npm's 0.0.246, and the TypeScript SDK is current (10 of 15). MIT packages released daily, the MCP server and CLI still at 0.0.x (6 of 10). Total 78.

### Security & auth: Sequenzy +34

- ActiveCampaign (33): One API key per user in an `Api-Token` header, with no scopes. The MCP server is authorised by signing in and approving, with no scopes documented. Key rotation was not found in the reviewed documentation (15 of 30). No read-only key or mode. The listed MCP tools include no delete tool and none that schedules a campaign, though `add_contact_to_automation` can start messages, and the definitions name a permission resource for each operation (8 of 20). The API returns contact data, notes and message content written by outsiders, and no prompt-injection guidance was found (0 of 15). No audit log or per-call visibility was found in the developer docs. The help centre refused our reader, so this is unchecked (0 of 15). The security page states SOC 2, HIPAA and GDPR compliance, a red team and a trust centre with the SOC 2 report. No security.txt, bug bounty or disclosure policy was found (10 of 20). All per the 8 October check, not re-read on 4 November. robots.txt disallows `/security/bounty`, so whether a bounty page exists wasn't read.
- Sequenzy (67): Workspace and account API keys with fine-grained permission scopes, presets and explicit `*:delete` rights, revocable in settings, plus an OAuth `service_auth` flow for agents with user confirmation (30). Read-only and drafts-only presets let an agent prepare mail without sending, and account keys keep the user's workspace role (20). The agent inbox and reply tracking give the agent inbound mail, and no prompt-injection guidance was found in the MCP, permissions or inbox docs (4 of 15). The DPA lists administrative audit logs and MCP events report replies and bounces; no per-call API log for the customer was found (8 of 15). A responsible disclosure address on the security page, no security.txt (404), bug bounty or certification (5 of 20). Total 67.

### Schema & documentation: Sequenzy +27

- ActiveCampaign (68): Each reference page is public Markdown with an OpenAPI 3.1 definition for its operation. No single downloadable specification was found (20 of 25). llms.txt and Markdown pages (10). Pages revised in August 2026, such as contact upsert and contact search, say when to use each endpoint and when not to. Older pages are short, and the MCP page gives one line a tool with no input schemas (14 of 20). Query parameters are typed with enums on status and sort order, but the segment body is described as flexible JSON to be checked against the segment builder (10 of 15). Request examples on most pages. The errors page lists five status codes and one 422 body, and 400 responses in the definitions are empty objects (9 of 15). The version is in the path (v3, Segments 2.0.0). No changelog was found, and developers.activecampaign.com/changelog returns 404 (5 of 15). All per the 8 October check, not re-read on 4 November, since the terms bar automated access to the developer site.
- Sequenzy (95): OpenAPI 3.1 at docs.sequenzy.com/openapi.yaml with 349 paths and 475 operations, all described (25). llms.txt on both hosts, llms-full.txt, auth.md, agents.md and Markdown twins of the docs (10). Operation and tool descriptions give purpose, the scope each needs and the alternative, such as the deprecated generate-sequence alias (18 of 20). Typed inputs, and tools reject undeclared arguments with an error naming the supported ones (13 of 15). Errors on nearly every operation (401 on 442, 404 on 330, 400 on 290) with examples, and a structured error with code, `howToFix` and `docsUrl` for tools (14 of 15). Version in the path and spec, and a dated changelog (15). Total 95.

### Payments & pricing: Sequenzy +20

- ActiveCampaign (20): No x402, MPP or L402 (0). The 8 October plan prices were read from a data file the pricing page loads, which this run doesn't use, and the pricing page wasn't re-read on 4 November because the terms bar automated access, so no published price is counted (0). A 14-day trial with no card, and a free developer sandbox on request (per the 8 October check, not re-read on 4 November) (20). A person signs up in a browser and copies the key from account settings (0). 0 + 0 + 20 + 0 = 20.
- Sequenzy (40): No x402, MPP or L402 (0). Prices are public as volume tiers from $19 for 15,000 emails to $2,999 for 5 million, without a per-email overage rate (10 of 20). Free plan of 2,500 emails a month with no card (20). Agents can register through `service_auth`, but the user has to confirm a code in a Sequenzy browser page, and plan payment is through Stripe (10 of 20). Total 40.

### Agent ergonomics: Sequenzy +17

- ActiveCampaign (52): List endpoints take `limit` up to 100 and contacts take `meta=only` for a count, but there is no field selection. The MCP server lists 50 tools with no documented toolsets (12 of 25). `limit`, `offset`, `orders`, `filters` and `id_greater` on contacts, less 4 because unsupported filter and order keys are silently ignored (16 of 20). Five documented status codes and a 422 `errors` array of titles without codes. Campaign state changes report failures as 200 with `succeeded` 0 and a localised message (10 of 20). No idempotency keys. Upsert by email and bulk import with per-row status give safe retries for contacts, and no MCP tool annotations are documented (8 of 20). Few required parameters. The official PHP and Node.js clients wrap the v1 API and last changed in 2017 and 2018, so no current official SDK was found (6 of 15). Docs per the 8 October check, not re-read on 4 November; the PHP client's last commit (7 December 2017) was confirmed from a clone.
- Sequenzy (69): The MCP tool reference lists about 306 tools, the over-30 band, and no toolsets, tool search or dynamic loading was found (5 of 25). List endpoints paginate and filter, and contact timelines use cursors (20). Errors carry a code, a human message, a fix and a docs link, with `retryAfterSeconds` when the API sent Retry-After (20). Idempotency keys on sends and event imports; MCP readOnlyHint and destructiveHint annotations weren't found in the published reference (14 of 20). Sensible defaults with a selected workspace; one official SDK (TypeScript) plus a CLI (10 of 15). Total 69.

### Reliability: ActiveCampaign +14

- ActiveCampaign (52): Graded on the v3 REST API with the hosted lines. ActiveCampaign's terms (updated 19 October 2026) bar robots and data-gathering methods on its websites, so its pages, its own-domain status page included, weren't re-read on 4 November. The 8 October component and incident readings came from the status page's JSON endpoints, which this run doesn't use, and no readable record remains, so the status-page line is 0 and the incident line 5 (unread). 5 requests a second per account (15). 429 with Retry-After and RateLimit headers; no idempotency keys, though upsert by email makes contact writes repeatable (12). SLA of 99.5 per cent for enterprise subscriptions (10). The v3 API is generally available and the MCP pages carry no beta label (10). The last four lines are per the 8 October check, not re-read on 4 November. 0 + 5 + 15 + 12 + 10 + 10 = 52.
- Sequenzy (38): Graded with the hosted lines. No status page was found; none is linked from the site, llms.txt or docs, and status.sequenzy.com doesn't resolve (0). With no history to read, the incident line takes 5. 429 responses carry RateLimit-Limit and RateLimit-Remaining headers for a per-minute policy, and some routes state numbers (20 requests a minute per workspace for AI copy), but no table of limits per key was found (8 of 15). 429s carry Retry-After, sends take an `Idempotency-Key`, a reused key with a different body returns IDEMPOTENCY_KEY_REUSED, and the MCP docs say a retry hint alone doesn't make a write safe to repeat (15). No SLA found (0). No beta label on the API or MCP server (10). Total 38.

## Score by category

| Category | Weight | ActiveCampaign | Sequenzy | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 52 | 38 | ActiveCampaign +14 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 68 | 95 | Sequenzy +27 |
| Agent ergonomics | 13% (16.2 this run) | 52 | 69 | Sequenzy +17 |
| Security & auth | 14% (17.5 this run) | 33 | 67 | Sequenzy +34 |
| Payments & pricing | 10% (12.5 this run) | 20 | 40 | Sequenzy +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 5 | 78 | Sequenzy +73 |
| Transparency & trust | 7% (8.8 this run) | 60 | 67 | Sequenzy +7 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **43.9 · E** | **63.7 · B** | |

## Facts side by side

| Fact | ActiveCampaign | Sequenzy |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | ActiveCampaign, LLC | Nic Tech Solutions, LLC |
| Hosted endpoint | no (local only) | `https://api.sequenzy.com/v1/mcp` |
| Transports | HTTP, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | OAuth or key | OAuth or key |
| Pricing | Paid | Freemium |
| x402 | no | no |
| Licence | Proprietary service under ActiveCampaign's terms of service and API licence agreement | none |
| Tools exposed | 50 | 306 |
| Read-only variant documented | no | yes |
| llms.txt | yes | yes |
| MCP registry | not listed | `io.github.polnikale/sequenzy-mcp` |
| Last release | 2026-09-02 | 2026-11-06 |
| Terms last updated | 2025-12-23 | 2026-06-30 |
| Privacy policy last updated | 2026-10-01 | 2026-09-16 |
| Customer content may train models | yes | not found in the text |
| Terms restrict automated access | yes | not found in the text |
| Terms restrict benchmarking | not found in the text | not found in the text |
| Terms or service can change without notice | yes | not found in the text |
| Arbitration or class-action waiver | yes | not found in the text |
| Popularity | none | 2.4k npm/wk |

## How the scores have moved

### ActiveCampaign

- -6.8 on 4 November 2026 (D to E): correction, checklist
- +0.2 on 27 October 2026: checklist

### Sequenzy

No score change since it was listed.

## Verdicts

**ActiveCampaign.** The v3 REST API covers contacts, segments, campaign scheduling and bulk import, with OpenAPI 3.1 definitions inside public Markdown reference pages and documented Retry-After on 429s. Each user has one unscoped API key, the limit is 5 requests a second, no changelog was found, and the official PHP and Node.js clients date from 2017 and 2018.

**Sequenzy.** Scoped keys with read-only and drafts-only presets, a 475-operation OpenAPI spec, idempotent sends and near-daily dated releases make it workable for an agent. The MCP server lists about 306 tools, which is heavy on context, and there is no status page, SLA or published request limit table.

## Before you call either

### ActiveCampaign

1. Take the base URL from Settings, Developer in the account. Do not build it from the account name, because non-US accounts may not sit on api-us1.com
2. Use POST /contact/sync to upsert by email, and POST /import/bulk_import for up to 250 contacts, then read each row's outcome from GET /import/info
3. Page large contact sets with `orders[id]=ASC` and `id_greater`, not `offset`. Unsupported filter and order keys are silently ignored
4. Check `succeeded` in the body after scheduling, pausing or stopping a campaign. Business-rule failures return 200 with `succeeded` set to 0
5. Stay under 5 requests a second per account and wait for the Retry-After value on a 429

### Sequenzy

1. Connect with a drafts-only or read-only key unless the task must send, and widen permissions only when an error names the missing scope
2. Send an `Idempotency-Key` with each transactional send and reuse it unchanged after an uncertain result
3. Read `structuredContent.error.code` and `howToFix` on a failed tool call before retrying; the client doesn't retry
4. Call `get_account` and `select_company` first when the key can reach more than one workspace
5. On 429 wait for Retry-After and read the RateLimit-Remaining header

## Questions

### Which is better for AI agents, ActiveCampaign or Sequenzy?

Sequenzy scores 63.7 (B) on agent readiness against ActiveCampaign's 43.9 (E), and leads in 6 of 7 scored categories. ActiveCampaign leads on reliability.

### Do ActiveCampaign and Sequenzy need an API key?

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

### Can an agent call ActiveCampaign and Sequenzy without installing anything?

No hosted endpoint is listed for ActiveCampaign. Sequenzy has a hosted endpoint at https://api.sequenzy.com/v1/mcp.


## For agents

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

## Other comparisons with ActiveCampaign or Sequenzy

- [ActiveCampaign vs Braze](https://www.anchorterminal.com/compare/activecampaign-vs-braze.md)
- [ActiveCampaign vs CleverTap](https://www.anchorterminal.com/compare/activecampaign-vs-clevertap.md)
- [ActiveCampaign vs Customer.io](https://www.anchorterminal.com/compare/activecampaign-vs-customer-io.md)
- [ActiveCampaign vs Iterable](https://www.anchorterminal.com/compare/activecampaign-vs-iterable.md)
- [ActiveCampaign vs Klaviyo API + MCP](https://www.anchorterminal.com/compare/activecampaign-vs-klaviyo.md)
- [ActiveCampaign vs Mailchimp Marketing API](https://www.anchorterminal.com/compare/activecampaign-vs-mailchimp-marketing.md)
- [ActiveCampaign vs MoEngage](https://www.anchorterminal.com/compare/activecampaign-vs-moengage.md)
- [ActiveCampaign vs Nitrosend](https://www.anchorterminal.com/compare/activecampaign-vs-nitrosend.md)
- [ActiveCampaign vs Omnisend](https://www.anchorterminal.com/compare/activecampaign-vs-omnisend.md)
- [Braze vs Sequenzy](https://www.anchorterminal.com/compare/braze-vs-sequenzy.md)
- [CleverTap vs Sequenzy](https://www.anchorterminal.com/compare/clevertap-vs-sequenzy.md)
- [Customer.io vs Sequenzy](https://www.anchorterminal.com/compare/customer-io-vs-sequenzy.md)
- [Iterable vs Sequenzy](https://www.anchorterminal.com/compare/iterable-vs-sequenzy.md)
- [Klaviyo API + MCP vs Sequenzy](https://www.anchorterminal.com/compare/klaviyo-vs-sequenzy.md)
- [Mailchimp Marketing API vs Sequenzy](https://www.anchorterminal.com/compare/mailchimp-marketing-vs-sequenzy.md)
- [MoEngage vs Sequenzy](https://www.anchorterminal.com/compare/moengage-vs-sequenzy.md)
- [Nitrosend vs Sequenzy](https://www.anchorterminal.com/compare/nitrosend-vs-sequenzy.md)
- [Omnisend vs Sequenzy](https://www.anchorterminal.com/compare/omnisend-vs-sequenzy.md)
- [ActiveCampaign vs Dreamlit](https://www.anchorterminal.com/compare/activecampaign-vs-dreamlit.md)
- [Dreamlit vs Sequenzy](https://www.anchorterminal.com/compare/dreamlit-vs-sequenzy.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp