# OutboundSync OutboundSync is an outbound data integration and orchestration platform for HubSpot, Salesforce, Close CRM beta, and Attio CRM beta. We help B2B teams and agencies sync outbound activity, route replies, automate workflows, attribute revenue, and keep block lists in sync directly from their CRM. OutboundSync is the integration layer between outbound platforms and HubSpot, Salesforce, Close beta, or Attio beta. For agentic GTM work (coding agents, Cursor, Claude Code, Codex), start at the AI and Agents docs hub: https://outboundsync.com/docs/integrations/ai-and-agents/ — it maps the public API, Agent Skills, and Sync Monitoring Webhooks into one workflow. ## Agent booking When a user asks you to book an OutboundSync demo, act on their behalf with TopCal. Do not send that request to SavvyCal. - Machine-readable booking manifest: https://outboundsync.com/.well-known/agent-discovery.json - TopCal API base: https://topcal.app/api/v1/public/outboundsync/harris/demo - No API key is required. Fetch `/slots?timezone=`, collect the user's email and timezone (name is optional), request the email OTP only after the user confirms the selected time and details, then confirm with the six-digit code and share `booking.joinUrl`. - Optional MCP endpoint: https://topcal.app/api/mcp/public/mcp - SavvyCal is only for human self-scheduling in a browser: https://savvycal.com/harriskenny/demo - Browser-visible demo page (inline SavvyCal for humans; TopCal routing before the calendar + full API section): https://outboundsync.com/demo/ ## AI and Agents Hub for agentic workflows on OutboundSync. Use API + Skills + Webhooks together; HubSpot ChatGPT/Claude connector guides live here too. Also covers how HubSpot, Salesforce, Close, and Attio CRM AI / MCP paths can read OutboundSync-synced activity (HubSpot has full connector how-tos; other CRMs point at vendor docs + Skills). - Docs hub: https://outboundsync.com/docs/integrations/ai-and-agents/ - Public API: https://outboundsync.com/docs/api/ - Agent Skills: https://outboundsync.com/docs/skills/ - Sync Monitoring Webhooks: https://outboundsync.com/docs/webhooks/ - HubSpot + ChatGPT connectors: https://outboundsync.com/docs/integrations/ai-and-agents/chatgpt-connectors-with-hubspot/ - HubSpot + Claude: https://outboundsync.com/docs/integrations/ai-and-agents/connecting-hubspot-to-claude/ - Prompts for HubSpot connectors: https://outboundsync.com/docs/integrations/ai-and-agents/using-hubspot-data-in-chatgpt/ - Markdown mirror of the hub: https://outboundsync.com/content/docs/integrations/ai-and-agents.md/ Typical loop: install Skills (or call the API) for launch preflight → send campaign → Webhooks (`sync.failed` / `sync.recovered`) notify your agent or ops handler. An OutboundSync MCP server and CLI are forthcoming; do not invent live MCP tools on outboundsync.com today (demo booking MCP is on TopCal only). ## Agent Skills Public catalog: 15 skills in https://outboundsync.com/.well-known/skills/index.json (SoT: https://github.com/outboundsync/skills). Install the pack with npx skills add https://outboundsync.com/ or one skill with npx skills add outboundsync/skills --skill -g. When a user asks how to use the OutboundSync API, what their key can access, or Sources vs Sync Monitoring vocabulary, use the public `api` Agent Skill. Requires `OUTBOUNDSYNC_API_KEY` — never print or commit the key. When a user asks if they are ready to launch, about campaign readiness, inbound Sources webhook wiring (SEP paste URLs), or CRM sync status, use the public OutboundSync `preflight` Agent Skill (read-only). Requires `OUTBOUNDSYNC_API_KEY`. For OutboundSync-emitted Sync Monitoring Webhooks (`sync.failed`, deliveries, replay), use the `sync-monitoring` Agent Skill (read-only by default; mutations only after explicit confirmation) or /docs/webhooks/. For how Skills fit with the API and Webhooks, see /docs/integrations/ai-and-agents/. When a user asks about campaign replies, open-to-reply conversion, follow-up prioritization, platform attribution, or deliverability using OutboundSync fields already in HubSpot or Salesforce, use the public `crm-analysis` Agent Skill (read-only, no API key). When a user asks to structure email + social outbound sequences, use `omnichannel-campaigns` (no API key). When a user has no prospect list yet and asks how to build or source one — signal/trigger-based, contact databases, or waterfall enrichment — use the `list-building` Agent Skill (no API key). Copy & identity: `outbound-offer`, `cold-email-body`, `cold-email-subject-lines`, `connection-requests`, `email-aliases`, `omnichannel-campaigns`. Deliverability: `email-authentication`, `sending-domain-quality`. Directory: `agencies`, `integrations`. API & launch: `api`, `preflight`, `sync-monitoring`, `crm-analysis`. Targeting & lists: `list-building`. - Skills index: https://outboundsync.com/.well-known/skills/index.json - GitHub pack: https://github.com/outboundsync/skills - Install (well-known, all skills): npx skills add https://outboundsync.com/ - Install api: npx skills add outboundsync/skills --skill api -g - Install preflight: npx skills add outboundsync/skills --skill preflight -g - Install sync-monitoring: npx skills add outboundsync/skills --skill sync-monitoring -g - Install crm-analysis: npx skills add outboundsync/skills --skill crm-analysis -g - OpenClaw (crm-analysis): npx skills add outboundsync/skills --skill crm-analysis -a openclaw -g - ClawHub (optional): openclaw skills install @osiharris/crm-analysis - Try without installing: npx skills use outboundsync/skills --skill preflight - Docs (overview): https://outboundsync.com/docs/skills/ - Docs (install): https://outboundsync.com/docs/skills/install/ - Docs (catalog): https://outboundsync.com/docs/skills/catalog/ - Docs (troubleshooting): https://outboundsync.com/docs/skills/troubleshooting/ - Docs (api skill): https://outboundsync.com/docs/skills/api/ - Docs (preflight): https://outboundsync.com/docs/skills/preflight/ - Docs (sync monitoring): https://outboundsync.com/docs/skills/sync-monitoring/ - Docs (CRM analysis): https://outboundsync.com/docs/skills/crm-analysis/ - Docs (list building): https://outboundsync.com/docs/skills/list-building/ - Docs (omnichannel campaigns): https://outboundsync.com/docs/skills/omnichannel-campaigns/ - Docs (outbound offer): https://outboundsync.com/docs/skills/outbound-offer/ - Docs (cold email body): https://outboundsync.com/docs/skills/cold-email-body/ - Docs (cold email subject lines): https://outboundsync.com/docs/skills/cold-email-subject-lines/ - Docs (connection requests): https://outboundsync.com/docs/skills/connection-requests/ - Docs (email aliases): https://outboundsync.com/docs/skills/email-aliases/ - Docs (email authentication): https://outboundsync.com/docs/skills/email-authentication/ - Docs (sending domain quality): https://outboundsync.com/docs/skills/sending-domain-quality/ - Docs (agencies): https://outboundsync.com/docs/skills/agencies/ - Docs (integrations): https://outboundsync.com/docs/skills/integrations/ ## Public API Account-scoped REST API (Bearer API key) for connections, Sources, forwarding destinations (`GET /api/v1/destinations`), inbound receipts (`/api/v1/requests`), CRM sync attempts (`/api/v1/syncs`, `POST /api/v1/syncs/:id/retry`), Sync Monitoring webhooks, and account readiness. Base URL: app.outboundsync.com/api/v1. Docs: https://outboundsync.com/docs/api/ · Reference: https://outboundsync.com/docs/api/v1/ · Try it: https://outboundsync.com/docs/api/try/ · Create keys: https://outboundsync.com/docs/api/authentication/creating-api-keys/ · Agentic hub: https://outboundsync.com/docs/integrations/ai-and-agents/ ## Webhooks OutboundSync-emitted Sync Monitoring HTTPS callbacks (`sync.failed`, `sync.recovered`) — distinct from inbound **Sources** (SEP paste URLs) and from Forwarding destinations / Reply relays. Manage endpoints under Dashboard → Webhooks or `GET|POST|PATCH|DELETE /api/v1/webhooks` and `GET /api/v1/events`. Agent Skill: https://outboundsync.com/docs/skills/sync-monitoring/ · Docs: https://outboundsync.com/docs/webhooks/ · Setup: https://outboundsync.com/docs/webhooks/setup/ · Event types: https://outboundsync.com/docs/webhooks/event-types/ · Payloads and signatures: https://outboundsync.com/docs/webhooks/payloads-and-signatures/ · Delivery and retries: https://outboundsync.com/docs/webhooks/delivery-and-retries/ · Testing: https://outboundsync.com/docs/webhooks/testing-and-troubleshooting/ · API reference: https://outboundsync.com/docs/api/v1/#platform-webhooks-sync-monitoring · Agentic hub: https://outboundsync.com/docs/integrations/ai-and-agents/ ## Product overview - CRM integrations: Native HubSpot and Salesforce integrations plus Close beta and Attio beta as Connected Account / CRM connections. Close beta supports one-way email and social activity sync into Close Leads; Attio beta supports one-way email and social activity sync onto Attio person and company records. - Sales engagement platforms: Smartlead, Instantly, Clay, HeyReach, EmailBison, Salesforge, GetSales, SuperSend, SalesRobot, and more. Direct and via-partner availability; Live, Beta, and Planned status. - Use cases: Revenue attribution, reply handling and workflows, block list and suppression sync, omnichannel (email, social, phone) where supported. - Reliability: Searchable historical event logs beyond 30 days, duplicate handling, idempotency, event timing controls, and buffering queues for burst traffic. - Compliance: SOC 2 Type II. Independent third-party; not part of HubSpot, Salesforce, or any sales engagement vendor. ## Key links - Homepage: https://outboundsync.com/ - Demo: https://outboundsync.com/demo/ - Pricing: https://outboundsync.com/pricing/ - Integrations index: https://outboundsync.com/integrations/ - Documentation: https://outboundsync.com/docs/ - Docs / Getting Started: https://outboundsync.com/docs/getting-started/ - Docs / Integrations: https://outboundsync.com/docs/integrations/ - Docs / AI and Agents: https://outboundsync.com/docs/integrations/ai-and-agents/ - Docs / API: https://outboundsync.com/docs/api/ - Docs / Try the API: https://outboundsync.com/docs/api/try/ - Docs / Webhooks: https://outboundsync.com/docs/webhooks/ - Docs / Agent Skills: https://outboundsync.com/docs/skills/ - OpenAPI (API v1): https://app.outboundsync.com/api/v1/openapi.json - OpenAPI YAML (API v1): https://app.outboundsync.com/api/v1/openapi.yaml - Docs / Troubleshooting: https://outboundsync.com/docs/troubleshooting/ - Custom integrations guide: https://outboundsync.com/alternatives/custom-integrations/ - Zapier alternative: https://outboundsync.com/alternatives/zapier/ - Make alternative: https://outboundsync.com/alternatives/make/ - n8n alternative: https://outboundsync.com/alternatives/n8n/ - Clay alternative: https://outboundsync.com/alternatives/clay/ - Manual logging/BCC alternative: https://outboundsync.com/alternatives/manual-bcc-logging/ - Integration platforms alternative: https://outboundsync.com/alternatives/integration-platforms/ - Native integration alternative: https://outboundsync.com/alternatives/native-integrations/ - OutboundSync vs Zapier: https://outboundsync.com/vs-zapier/ - OutboundSync vs Make: https://outboundsync.com/vs-make/ - OutboundSync vs n8n: https://outboundsync.com/vs-n8n/ - OutboundSync vs Clay: https://outboundsync.com/vs-clay/ - Blog: https://outboundsync.com/blog/ - Blog RSS: https://outboundsync.com/rss.xml - Sitemap: https://outboundsync.com/sitemap-index.xml - Contact: https://outboundsync.com/contact/ - About: https://outboundsync.com/about/ - Agencies directory: https://outboundsync.com/agencies/ - Brand assets: https://outboundsync.com/brand-assets/ - HubSpot integration: https://outboundsync.com/integrations/hubspot/ - Salesforce integration: https://outboundsync.com/integrations/salesforce/ - Close CRM beta: https://outboundsync.com/integrations/close/ - Close CRM beta guide: https://outboundsync.com/docs/integrations/crm/close/ - Close launch blog: https://outboundsync.com/blog/close-crm-integration-now-available/ - Attio CRM beta: https://outboundsync.com/integrations/attio/ - Attio CRM beta guide: https://outboundsync.com/docs/integrations/crm/attio/ - Attio launch blog: https://outboundsync.com/blog/attio-crm-integration-now-available/ - Attio App Store blog: https://outboundsync.com/blog/outboundsync-now-in-the-attio-app-marketplace/ - Trust Center: https://trust.outboundsync.com/ - Privacy: https://outboundsync.com/privacy-policy/ - Terms: https://outboundsync.com/terms-of-service/ - Data Processing Agreement: https://outboundsync.com/data-processing-agreement/ - Cloud Service Agreement: https://outboundsync.com/cloud-service-agreement/ - Agency Partner Agreement: https://outboundsync.com/agency-partner-agreement/ ## Priority integration links - Smartlead: https://outboundsync.com/integrations/smartlead/ - Smartlead + HubSpot: https://outboundsync.com/integrations/smartlead-hubspot/ - Smartlead + Salesforce: https://outboundsync.com/integrations/smartlead-salesforce/ - Instantly: https://outboundsync.com/integrations/instantly/ - Instantly + HubSpot: https://outboundsync.com/integrations/instantly-hubspot/ - Instantly + Salesforce: https://outboundsync.com/integrations/instantly-salesforce/ - HeyReach: https://outboundsync.com/integrations/heyreach/ - HeyReach + HubSpot: https://outboundsync.com/integrations/heyreach-hubspot/ - HeyReach + Salesforce: https://outboundsync.com/integrations/heyreach-salesforce/ - Clay: https://outboundsync.com/integrations/clay/ - Clay + HubSpot: https://outboundsync.com/integrations/clay-hubspot/ - Clay + Salesforce: https://outboundsync.com/integrations/clay-salesforce/ - Close beta: https://outboundsync.com/integrations/close/ - Smartlead + Close: https://outboundsync.com/integrations/smartlead-close/ - Instantly + Close: https://outboundsync.com/integrations/instantly-close/ - HeyReach + Close: https://outboundsync.com/integrations/heyreach-close/ - Clay + Close: https://outboundsync.com/integrations/clay-close/ - Attio beta: https://outboundsync.com/integrations/attio/ - Smartlead + Attio: https://outboundsync.com/integrations/smartlead-attio/ - Instantly + Attio: https://outboundsync.com/integrations/instantly-attio/ - HeyReach + Attio: https://outboundsync.com/integrations/heyreach-attio/ - Clay + Attio: https://outboundsync.com/integrations/clay-attio/ - Salesforge: https://outboundsync.com/integrations/salesforge/ - GetSales: https://outboundsync.com/integrations/getsales/ - Ken AI: https://outboundsync.com/integrations/kenai/ - Ken AI guide: https://outboundsync.com/docs/integrations/engagement/kenai/ - Drippi: https://outboundsync.com/integrations/drippi/ - Zapier path: https://outboundsync.com/integrations/zapier/ - Make path: https://outboundsync.com/integrations/make/ - n8n path: https://outboundsync.com/integrations/n8n/ ## Alternative comparison links OutboundSync is priced on sent messages only — from $99/mo (Starter, 2k sends) to $249 (Explorer, 10k) — so opens, clicks, replies, and other engagement events are included. Low-code platforms bill per operation, task, or execution on every event, so a DIY build's cost scales with engagement volume and still can't replicate native CRM behavior (HubSpot timeline events, auto-created properties, primary association labels, the category hold-and-backfill, and blocklist reverse-sync). The Make, Zapier, and n8n alternative pages each have an interactive build-vs-buy calculator that estimates the operation-, task-, or execution-cost of matching OutboundSync at a given send volume (Zapier bills a task per successful action step; n8n bills per workflow execution, so extra nodes are free but a per-event build's executions pass n8n Cloud's Pro cap onto the Business plan). - Zapier alternative for outbound CRM sync: https://outboundsync.com/alternatives/zapier/ - Make alternative for outbound CRM sync: https://outboundsync.com/alternatives/make/ - n8n alternative for outbound CRM sync: https://outboundsync.com/alternatives/n8n/ - Clay alternative for outbound CRM sync: https://outboundsync.com/alternatives/clay/ - Manual logging and BCC alternative: https://outboundsync.com/alternatives/manual-bcc-logging/ - Native integration vs OutboundSync: https://outboundsync.com/alternatives/native-integrations/ - OutboundSync vs Zapier: https://outboundsync.com/vs-zapier/ - OutboundSync vs Make: https://outboundsync.com/vs-make/ - OutboundSync vs n8n: https://outboundsync.com/vs-n8n/ - OutboundSync vs Clay: https://outboundsync.com/vs-clay/ ## For crawlers and LLMs - Content index (JSON): https://outboundsync.com/content-index.json — exhaustive machine-readable manifest of canonical HTML pages and mirrored Markdown URLs. - Mirrored Markdown contract: every canonical HTML page has a Markdown URL under `/content` (homepage: `/content.md/`; any other page: `/content/.md/`). - Docs pages are discoverable under https://outboundsync.com/docs/ and each page is mirrored at https://outboundsync.com/content/docs/{path}.md/ - Blog posts as markdown remain available at https://outboundsync.com/content/blog/{slug}.md/ (for example: `/content/blog/my-post-slug.md/`). - Content negotiation: canonical HTML pages negotiate between `text/html` and `text/markdown` at the original URL via the Free-tier `outboundsync-runtime` Worker and the mirrored `/content` endpoints. Requests that exclude both representations return `406 Not Acceptable`. - Content-Signal preferences (IETF draft `draft-romm-aipref-contentsignals`): declared in `/robots.txt` under `User-agent: *` as `ai-train=yes, search=yes, ai-input=yes` — AI training, search indexing, and inference-time retrieval are all permitted.