Reply.io

• ▸Multichannel sequences across email, LinkedIn, calls, SMS, and WhatsApp (semi-automation)
• ▸Audience discovery and B2B contact database with intent signals (hiring activity, LinkedIn engagement, tech stack changes)
• ▸LinkedIn and Sales Navigator prospecting with native filters
• ▸Contact enrichment and scoring
• ▸Website visitor tracking/identification
• ▸AI-generated sequences, AI variables for personalization, and AI-generated response handling
• ▸Jason: an AI SDR agent that researches prospects and manages outbound end-to-end
• ▸Unified inbox across channels
• ▸Meeting scheduling synced to calendar, plus Calendly/CRM (HubSpot, Salesforce, Pipedrive, Copper, Close) integrations
• ▸REST API (v3) and an official hosted MCP server exposing 70 tools

Authentication

Bearer token in the Authorization header (API key), per-request

Base URL

https://api.reply.io (all endpoints under /v3)

Rate limits

100 requests/minute and 3,000 requests/hour per user; reporting/statistics endpoints have stricter limits; exceeding limits returns 429 with a Retry-After header

Notable endpoints

• GET /v3/whoami (confirm credentials)
• /v3/sequences (multichannel sequences)
• /v3/background-jobs/{id} (poll long-running operations, e.g. bulk imports/email validation)
• Contacts, contact lists, custom fields, and blacklist rules
• Unified Inbox replies
• Sending schedules and holiday calendars
• Webhooks for real-time events

MCP tools exposed

reply_search_sequencesreply_get_sequence_stepsreply_get_sequence_step_variantsreply_get_sequence_statsreply_compare_sequence_performancereply_start_sequencereply_pause_sequencereply_add_contact_to_sequencereply_change_status_in_sequencereply_assign_email_account_to_sequencereply_assign_linkedin_account_to_sequencereply_assign_schedule_to_sequencereply_attach_offer_to_sequencereply_attach_playbook_to_sequencereply_attach_knowledge_base_to_sequencereply_set_sequence_reply_modereply_search_contactsreply_filter_contactsreply_create_contactreply_update_contactreply_get_contact_activityreply_mark_contacts_as_repliedreply_change_contact_ownerreply_blacklist_contactreply_get_inbox_emailsreply_send_inbox_replyreply_change_inbox_categoryreply_list_pending_approvalsreply_approve_messagereply_bulk_approve_messagesreply_reject_messagereply_regenerate_messagereply_list_knowledge_basesreply_get_knowledge_basereply_create_knowledge_basereply_update_knowledge_basereply_add_knowledge_base_sourcereply_delete_knowledge_base_sourcereply_list_reply_handlersreply_get_reply_handlerreply_create_reply_handlerreply_update_reply_handlerreply_delete_reply_handlerreply_list_reengagement_cardsreply_get_reengagement_cardreply_create_reengagement_cardreply_update_reengagement_cardreply_delete_reengagement_cardreply_list_offersreply_get_offerreply_create_offerreply_update_offerreply_generate_offer_from_websitereply_list_playbooksreply_get_playbookreply_create_playbookreply_update_playbookreply_duplicate_playbookreply_list_my_tasksreply_create_taskreply_complete_taskreply_list_email_accountsreply_list_linkedin_accountsreply_list_schedulesreply_search_listsreply_search_team_membersreply_search_knowledge_basereply_get_knowledge_base_articlereply_get_app_mapreply_report_unsupported_request

Machine-readable spec

No OpenAPI link

Checked 2026-08-03 against their pricing page. Vendors change pricing without notice.

Beyond sequence automation, it sells "Jason," a fully automated AI SDR add-on priced separately from the core platform, and exposes the platform programmatically through a REST API (v3, Bearer-token auth) and an official remote MCP server for AI clients like Claude and Cursor.

Businesses, founders, solopreneurs, and sales/SDR teams that want to scale multichannel cold outreach (email, LinkedIn, calls, SMS) from a single platform, per the vendor's own FAQ framing.

The entry Email Volume plan is priced by active contacts/month (starting at 1,000) rather than by unlimited sending, so high-volume outbound teams will need to size up quickly; LinkedIn automation and Calls/SMS are unbundled add-ons at $69/mo and $29/mo per account on top of the base seat price, so a team wanting true all-channel coverage on the cheap plan will pay more than the advertised $49/user headline. Teams of 20+ are explicitly routed to a custom/contact-sales tier for the API/whitelabel features, so the self-serve pricing does not apply once you scale past that.

Platforms that send outbound email at volume, manage inbox rotation and warm-up, and track replies.

Category: Cold email and sequencing. Membership is decided by 3 stated tests, not by category tags — see them and the full comparison.

• An official video from Reply's own YouTube channel demonstrating a specific feature (channel identity was confirmed, but no specific video was verified as vendor-produced during this pass)
• Confirmation of a machine-readable OpenAPI/Swagger specification
• A machine-readable OpenAPI specification was not included in the reviewed source set.