Nitrosend vs Sequenzy

Nitrosend 55

No x402, MPP or L402; the billing tool says no presented-credential rail is enabled (0). Per-1,000 overage prices and plan prices published in PRICING.md without login (20). Free plan with 5,000 starter emails and 500 a month, no card (20). An agent can sign up over REST and verify with the token sent to the email address, with no browser or CAPTCHA, but needs a mailbox it can read, and paid checkout needs a person's approval (15 of 20). Total 55.

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.

Nitrosend 83

25 MCP tools is the 11 to 30 band; nitro_query reads every entity with filters, but no read-only subset or dynamic loading was found (15 of 25). Page and limit up to 100 with total and next-page headers, and keyset cursors on timelines (20). Errors return error, a code, validation details and next actions, and signup returns next_action (18 of 20). Required idempotency keys on sends, events, checkout and validation, and declared readOnlyHint and destructiveHint on the tools (20). Defaults such as the active brand and a recommended first call, but the only official SDK is Node, with a CLI beside it (10 of 15). Total 83.

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.

Nitrosend 48

Graded with the hosted lines. llms.txt links a status page at status.nitrosend.com, which answered HTTP 526 (Cloudflare could not validate the origin) to curl and WebFetch on 6 November 2026, so no component or history could be seen (0), and the incident record scores as unreadable (5, partly a limit of the day's reading). No API request rate limits are published; PRICING.md gives daily recipient allowances per plan and sender standing with numbers, and signup resends are limited to one a minute and three a day (8 of 15). 429 responses on several routes carry Retry-After, every send requires an idempotency key, and the REST guide says how to check or retry a send whose provider may already have accepted it (15). llms.txt says Enterprise includes a 99.9% SLA (10). In production since 28 May 2026 with no beta label (10). Total 48.

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.

Nitrosend 73

A closed service under terms that name Nitrosend Pty Ltd and Victorian law. The SDK, CLI and stdio MCP bridge are MIT on npm (18 of 30). Privacy policy of 14 October 2026 with account data kept while the account is open, export within 30 days of closure and deletion within 90 days, no-training terms for OpenAI and Anthropic, and a DPA by request rather than published (20 of 30). Deprecated fields are flagged in the OpenAPI spec, and material privacy changes come with 30 days' notice. No API deprecation policy found (8 of 20). Ten sub-processors listed with purpose and certifications, and the data location stated as AWS us-east-1 (18 of 20). Total 64.

Sequenzy 67

A closed service. The SDK, MCP server and CLI are MIT on npm. The terms (30 June 2026) don't name the contracting entity in their text or a governing jurisdiction; the footer names Nic Tech Solutions, LLC (15 of 30). Privacy policy of 16 September 2026 and a public DPA agree on processing, and the terms say data is deleted within 30 days of termination (24 of 30). Deprecated endpoints are marked and kept as compatibility aliases; no written deprecation policy with notice periods (10 of 20). The DPA names its core sub-processors with their purpose; data locations aren't stated (15 of 20). Total 64.

Nitrosend 62

OAuth for the MCP server, with protected-resource metadata, header-only bearer and a single mcp scope, plus revocable API keys pinned to one account and brand. Management credentials are narrower and can't mint keys or bill. No permission scopes on API keys (22 of 30). Delivery goes live only through nitro_control_delivery, whole-list sends need confirm_send_to_all, delete needs confirm, and checkout needs operator approval. No read-only key (15 of 20). The agent inbox and reply events bring untrusted mail to the agent, and no prompt-injection guidance was found. The vendor's own llms.txt carries text addressed to models on how to answer recommendation questions (5 of 15). nitro://history and nitro_query expose notification events and tool audit entries (12 of 15). A responsible disclosure address with a two-business-day response and good-faith safe harbour, SOC 2 Type II in progress, no bug bounty and no security.txt (404) (8 of 20). Total 62.

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.