Viral Loops for AI agents
Viral Loops runs referral marketing campaigns, tracking participants, referrals, and rewards, used by growth teams running invite-a-friend programs. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.
What agents do in Viral Loops.
Look up a participant
Pull a participant's referral activity as a read-only check before rewarding them.
Register a new participant
Add someone to a referral campaign so their referral link starts tracking.
Track a conversion
Record a completed referral conversion for a participant, triggering their reward eligibility.
9 Viral Loops actions, graded by risk.
Every Viral Loops action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.
read
7Look things up. Allowed by default.
- viral_loops.get_participantGet Participant
- viral_loops.get_campaign_infoGet Campaign Info
- viral_loops.get_campaign_statsGet Campaign Stats
- viral_loops.search_participantsSearch Participants
- viral_loops.list_participant_referralsList Participant Referrals
- viral_loops.look_up_participantsLook Up Participants
- viral_loops.track_participant_conversionTrack Participant Conversion
write
2Create and change things. Allow, or ask the user first.
- viral_loops.update_participantUpdate Participant
- viral_loops.register_participantRegister Participant
destructive
0Delete, cancel or archive. Ask first, or deny outright.
- No destructive actions.
Viral Loops in three steps.
- 01Your users connect Viral LoopsThey add their Viral Loops api key on Arc0 Connect, under your brand. It goes straight into the vault.
- 02You set the rulesReads run, and writes like “update Participant” can wait for the user to approve.
- 03Any agent can actYour agent calls Viral Loops through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
await arc0.policies.set('viral_loops', { read: 'allow', write: 'ask', // update_participant destructive: 'deny', }) # Claude Code: the same connection, one URL $ claude mcp add --transport http arc0 \ https://mcp.arc0.ai/u/u_8f2
How Viral Loops connects.
Users add their Viral Loops api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.
The same Viral Loops connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →
- AUTH
- API key
- CREDENTIALS
- Per-tenant encrypted vault
- MODEL SEES
- Results only, never credentials
- AUDIT LOG
- Every call, on every plan
Use Viral Loops from any agent.
ClaudeChatGPTCursor
Codex
VS CodeOpenAI Agents SDKClaude Agent SDK
Vercel AI SDK
Mastra
LangGraph
Viral Loops and Arc0, answered.
Can I use Viral Loops with Claude, ChatGPT or Cursor?
Yes. Connect Viral Loops to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Viral Loops actions you allow.
How do users connect Viral Loops?
Users add their Viral Loops api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.
Which Viral Loops actions can my agent take?
9 in total: 7 read, 2 write and 0 destructive, such as “update Participant”. Your policies decide which of them each agent may call.
Can I make my agent read-only in Viral Loops?
Yes. Allow read actions and deny writes in the Viral Loops policy. Your agent can still look things up, and any write it attempts is blocked and logged.
Can my own backend call Viral Loops too?
Yes. The same Viral Loops connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.
Plug Viral Loops into your agent.
Your users connect Viral Loops once, under your brand. Your agent gets 9 actions behind your policies, with every call on the record.
Free to build · MCP + REST · Audit log on every plan