Fidel API for AI agents

Fidel API links payment cards to mobile and web applications for real-time transaction monitoring and card-linked offers, used by fintechs building rewards and loyalty 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.

Connect Fidel API See the 39 actions ↓

Developer toolsAPI keyMCP + RESTfidel.uk

AUDIT LOG · FIDEL APIPOLICY: acme-support

09:41:07 · claude · u_8f2read

fidel_api.list_mids

List MIDs✓ allowed · 212ms

09:41:08 · claude · u_8f2read

fidel_api.get_mid

Get MID✓ allowed · 164ms

09:41:09 · claude · u_8f2write

fidel_api.create_brand

Create Brand✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

fidel_api.delete_offer

Delete Offer✕ blocked · policy: deny

EVERY FIDEL API CALL, ON THE RECORD

01 · USE CASES

What agents do in Fidel API.

Check a transaction record

Get a transaction to confirm it matched a card-linked offer before crediting a reward.

List locations under a brand

List the locations tied to a brand to confirm coverage before launching an offer.

Confirm before deleting an offer

Require approval before deleting an offer, since it stops rewards for every linked location.

02 · ACTIONS

39 Fidel API actions, graded by risk.

Every Fidel API action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

Look things up. Allowed by default.

fidel_api.get_mid
Get MID
fidel_api.get_brand
Get Brand
fidel_api.get_offer
Get Offer
fidel_api.list_mids
List MIDs
fidel_api.list_cards
List Cards
fidel_api.get_program
Get Program
fidel_api.get_webhook
Get Webhook
fidel_api.list_brands
List Brands
fidel_api.list_offers
List Offers
fidel_api.get_location
Get Location
fidel_api.list_programs
List Programs
fidel_api.list_locations
List Locations
fidel_api.get_mid_request
Get MID Request
fidel_api.get_transaction
Get Transaction
fidel_api.list_mid_requests
List MID Requests
fidel_api.list_transactions
List Transactions

+ 6 MORE

write

Create and change things. Allow, or ask the user first.

fidel_api.create_brand
Create Brand
fidel_api.create_offer
Create Offer
fidel_api.update_brand
Update Brand
fidel_api.update_offer
Update Offer
fidel_api.create_program
Create Program
fidel_api.update_program
Update Program
fidel_api.update_webhook
Update Webhook
fidel_api.create_location
Create Location
fidel_api.create_mid_request
Create MID Request
fidel_api.create_brand_webhook
Create Brand Webhook
fidel_api.create_program_webhook
Create Program Webhook
fidel_api.link_location_to_offer
Link Location to Offer
fidel_api.unlink_location_from_offer
Unlink Location From Offer
fidel_api.link_all_program_locations_to_offer
Link All Program Locations to Offer

destructive

Delete, cancel or archive. Ask first, or deny outright.

fidel_api.delete_offer
Delete Offer
fidel_api.delete_location
Delete Location
fidel_api.delete_program_webhook
Delete Program Webhook

03 · HOW IT WORKS

Fidel API in three steps.

01Your users connect Fidel APIThey add their Fidel API api key on Arc0 Connect, under your brand. It goes straight into the vault.
02You set the rulesReads run, writes like “create Brand” can wait for the user, and “delete Offer” can be denied outright.
03Any agent can actYour agent calls Fidel API through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.

POLICY.TS

await arc0.policies.set('fidel_api', {
  read: 'allow',
  write: 'ask',        // create_brand
  destructive: 'deny',  // delete_offer
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2

04 · AUTH AND DATA

How Fidel API connects.

Users add their Fidel API 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 Fidel API 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

05 · WORKS WITH

Use Fidel API from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

More developer tools apps.

Addressfinder17 actions

Addresszen2 actions

Alchemy36 actions

ALL DEVELOPER TOOLS APPS →

07 · FAQ

Fidel API and Arc0, answered.

Q01

Can I use Fidel API with Claude, ChatGPT or Cursor?

Yes. Connect Fidel API 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 Fidel API actions you allow.

Q02

How do users connect Fidel API?

Users add their Fidel API 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.

Q03

Which Fidel API actions can my agent take?

39 in total: 22 read, 14 write and 3 destructive, such as “create Brand”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Fidel API?

Yes. Actions like “delete Offer” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Fidel API too?

Yes. The same Fidel API connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Fidel API into your agent.

Your users connect Fidel API once, under your brand. Your agent gets 39 actions behind your policies, with every call on the record.

Connect Fidel API Browse all apps →

Free to build · MCP + REST · Audit log on every plan