Enrich Layer API + MCP vs ZeroBounce

Enrich Layer API + MCP 26

Newest MCP release 0.3.0, tagged on 12 June and published to npm on 19 June 2026 per the 1 October check, 138 days before this check (10). The last commits, on 10 and 11 August 2026, haven't been released. No release or dated changelog entry found from 6 August to 4 November (0). Release dates of the enrichlayer-cli npm package couldn't be read. Four merged pull requests since March 2026 and no public changelog. We couldn't see issue replies from git (8 of 25). Not in the official MCP registry and no official SDKs found (0). CI runs build, tests and an OpenAPI conformance check, and dependencies are recent (8 of 10).

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.

Enrich Layer API + MCP 79

OpenAPI 3.0 file at enrichlayer.com/docs/api/v2/openapi.yaml, with a JSON twin and x-credits per operation. The MCP repo vendors a 408 kB copy and its CI fails any tool that drifts from it (25). llms.txt and an agents page in Markdown (10). MCP tool descriptions state what each returns, which identifier to pass and the credit cost, but not when to pick one tool over another (14 of 20). Zod schemas with enums for include and exclude flags and cache modes (13 of 15). Examples in the spec, and the agents page lists 401, 403, 404, 429 and 503 with what each means, though no error body schema is given (12 of 15). /api/v2 paths and a v3 preview, no public changelog, MCP versions 0.2.0 and 0.3.0 tagged (5 of 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.

Enrich Layer API + MCP 40

One secret key per user, sent as a bearer token. We found no scopes or key rotation docs. The hosted MCP server takes the same key at an OAuth consent screen (15 of 30). The API only reads, and the MCP marks all 25 tools read-only (18 of 20). Profiles carry free text written by the people they describe, and we found no prompt-injection guidance (2 of 15). A free credit-balance endpoint and nothing more for per-call visibility (5 of 15). No security.txt, disclosure policy, bug bounty or certification. The trust centre covers privacy rights and sub-processors only, and the privacy policy says SOC 2 is under consideration. OSV lists no advisory (0 of 20).

ZeroBounce 65

Several named keys besides a Master key, regeneration, deactivation and IP whitelists (25), less 10 because the documented calls carry the key in the api_key query string (15 of 30). Validation only reads, though file and list endpoints can delete uploads (12 of 20). Results are structured status codes with little free text (10 of 15). API usage and dashboard statistics endpoints (10 of 15). SOC 2 Type 2, ISO/IEC 27001:2022, continuous testing with Intigriti and penetration testing with BitSentinel; no public disclosure policy found (18 of 20). 15+12+10+10+18 = 65.

Enrich Layer API + MCP 40

No x402, MPP or L402 (0). Pack prices ($10 for 100 credits to $1,000 for 46,297), annual plans and per-endpoint credit costs are public (20). 500 free credits at signup, and the CLI page says no credit card is needed (20). A person signs up 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.