Daffy for AI agents
Daffy is a donor-advised fund platform for charitable giving, letting people set money aside tax-free and donate it to registered charities over time. 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 Daffy.
Check a fund's balance
Check the current balance in a donor-advised fund before recommending a donation.
Search for a nonprofit
Search for a registered nonprofit by name before directing a donation to it.
Confirm before creating a gift
Confirm before creating a gift to a charity, since a donation can't be undone once sent.
12 Daffy actions, graded by risk.
Every Daffy action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.
read
11Look things up. Allowed by default.
- daffy.get_giftsGet Gifts
- daffy.get_balanceGet Balance
- daffy.get_donationsGet Donations
- daffy.get_user_causesGet User Causes
- daffy.get_gift_by_codeGet Gift by Code
- daffy.get_user_profileGet User Profile
- daffy.get_contributionsGet Contributions
- daffy.get_user_donationsGet User Donations
- daffy.search_non_profitsSearch Non-Profits
- daffy.get_user_by_usernameGet User by Username
- daffy.get_non_profit_by_ein2Get Non-Profit by EIN (v2)
write
1Create and change things. Allow, or ask the user first.
- daffy.create_giftCreate Gift
destructive
0Delete, cancel or archive. Ask first, or deny outright.
- No destructive actions.
Daffy in three steps.
- 01Your users connect DaffyThey add their Daffy api key on Arc0 Connect, under your brand. It goes straight into the vault.
- 02You set the rulesReads run, and writes like “create Gift” can wait for the user to approve.
- 03Any agent can actYour agent calls Daffy through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.
await arc0.policies.set('daffy', { read: 'allow', write: 'ask', // create_gift destructive: 'deny', }) # Claude Code: the same connection, one URL $ claude mcp add --transport http arc0 \ https://mcp.arc0.ai/u/u_8f2
How Daffy connects.
Users add their Daffy 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 Daffy 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 Daffy from any agent.
ClaudeChatGPTCursor
Codex
VS CodeOpenAI Agents SDKClaude Agent SDK
Vercel AI SDK
Mastra
LangGraphMore finance and accounting apps.
Daffy and Arc0, answered.
Can I use Daffy with Claude, ChatGPT or Cursor?
Yes. Connect Daffy 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 Daffy actions you allow.
How do users connect Daffy?
Users add their Daffy 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 Daffy actions can my agent take?
12 in total: 11 read, 1 write and 0 destructive, such as “create Gift”. Your policies decide which of them each agent may call.
Can I make my agent read-only in Daffy?
Yes. Allow read actions and deny writes in the Daffy policy. Your agent can still look things up, and any write it attempts is blocked and logged.
Can my own backend call Daffy too?
Yes. The same Daffy connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.
Plug Daffy into your agent.
Your users connect Daffy once, under your brand. Your agent gets 12 actions behind your policies, with every call on the record.
Free to build · MCP + REST · Audit log on every plan