LeadMagic API + MCP vs ZeroBounce

LeadMagic API + MCP 93

OpenAPI file at leadmagic.io/openapi.json, per the 30 September check (25). llms.txt (10). MCP tools state their purpose and credit cost, and the server tells the model to report only data the tools returned (16 of 20). Typed request bodies (12 of 15). RFC 9457 problem details with a request_id on every error, and documented 400, 401, 402 and 429 cases (15). A dated changelog versioned per component, api 3.3.1 on 2026-09-17 (15).

ZeroBounce 54

No OpenAPI or other machine-readable contract found; a Postman collection is linked (5 of 25). llms.txt lists marketing pages, and the docs have no Markdown twins (5 of 10). Endpoint pages explain timing, credits and when to use batch or file APIs (14 of 20). Parameter tables and listed status and sub-status values, including the ai_agent_mailbox sub-status added in July 2026 (10 of 15). Examples per endpoint, a sandbox and an error-code page (12 of 15). v2 paths, an API migration page and dated maintenance notices on the status page, with no API changelog (8 of 15). 5+5+14+10+12+8 = 54.

LeadMagic API + MCP 52

Own status page at leadmagic.io/status listing the REST API, web app, Email Finder, Mobile Finder, Email Validation and integrations, with a live API health check but no incident history, re-read on 4 November (10 of 20). No history to read (5). Per-second and per-minute limits published, 5 or 10 requests a second for credit-free search with a fair-use ceiling of 13,333 searches a day, and 300 or 600 Email Finder and Validation lookups a minute by plan (15). 429 carries Retry-After with advice to back off, a rejected 429 consumes no credits, and 400s aren't charged. Bulk job submissions and the MCP's Tables tools write data, and no idempotency key or safe-retry guidance for writes was found, so safe-retry guidance without keys, as runway and fal-video read retries of billed jobs (12). The Service Level and Availability Policy states there's no guaranteed uptime and service credits are discretionary, per the 1 October check (0). Generally available (10). 10 + 5 + 15 + 12 + 0 + 10 = 52.

ZeroBounce 75

Hosted lines. Statuspage at status.zerobounce.net with API, API-US, API-EU, Bulk API, website and Cloudflare components (20). The incident feed for 8 August to 6 November shows a 6-minute members platform disruption on 9 September, about 3 minutes of reduced EU API availability on 1 October, and a file upload issue on 26 October resolved within 6 minutes, all minor (20). Limits published per endpoint group with numbers and block lengths (15). 429 is documented with advice to throttle, but no Retry-After, and a block can last an hour or a day (10 of 15). No SLA found (0). Generally available (10). 20+20+15+10+0+10 = 75.

LeadMagic API + MCP 20

No x402, MPP or L402 (0). Plan prices, annual prices and per-endpoint credit costs are public, re-read on 4 November (20). There are no free credits, the pricing FAQ now calls payments non-refundable except where law or a signed agreement says otherwise, and a 14-day Search trial 'with no automatic charge' covers search only, with no word on whether a card is needed (0). A person signs up and pays in a browser (0).

ZeroBounce 35

No x402, MPP or L402 (0). Per-credit prices public, from $39 for 2,000 validations (20). Freemium of 100 validations a month for business or premium domains; a card requirement isn't stated, and free webmail addresses don't qualify (15 of 20). A person signs up in a browser (0). 0+20+15+0 = 35.

LeadMagic API + MCP 80

The hosted MCP server is in the official MCP registry as io.leadmagic/server (and io.leadmagic/sheets) since 3 October 2026, with 2.23.5 published on 15 October 2026, 20 days before 4 November (30). The changelog's newest entry is api 3.3.1 on 17 September, which alone would give 20. In the 90 days from 6 August, changelog entries on 25 August (web 3.2.0 and api 3.3.0) and 17 September (api 3.3.1), and ten io.leadmagic/server versions between 3 and 15 October (20). Public changelog and support, issue handling not visible (10 of 15). In the official MCP registry under the verified io.leadmagic namespace (15). No packages to judge (5 of 10). 30 + 20 + 10 + 15 + 5 = 80. The MCP section of the changelog stops at mcp 2.5.0 (2 May 2026), while the server card reports 2.23.6, undated.

ZeroBounce 70

Closed service. The JavaScript SDK 3.0.0 was published on 25 October 2026 (30). No API changelog; the dated changes found in 90 days are that release and status-page notices, fewer than three releases (10 of 20). Support by email and 24/7 chat per the docs, a public status page; replies not tested (10 of 15). Official SDKs in many languages and an MCP server (15). Package health not checked (5 of 10). 30+10+10+15+5 = 70.