Countdown API for AI agents

Countdown API provides real-time eBay marketplace data, including product listings, reviews, and seller feedback, for research and ongoing price monitoring. 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 Countdown API See the 25 actions ↓

E-commerceAPI keyMCP + RESTcountdownapi.com

AUDIT LOG · COUNTDOWN APIPOLICY: acme-support

09:41:07 · claude · u_8f2read

countdown_api.list_error_logs

List Error Logs✓ allowed · 212ms

09:41:08 · claude · u_8f2read

countdown_api.get_account

Get Account Information✓ allowed · 164ms

09:41:09 · claude · u_8f2write

countdown_api.create_destination

Create Destination✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

countdown_api.delete_collection

Delete Collection✕ blocked · policy: deny

EVERY COUNTDOWN API CALL, ON THE RECORD

01 · USE CASES

What agents do in Countdown API.

Set up a product collection

Create a collection to track a set of eBay listings for price or stock changes.

Check a collection's results

Get the result set from a running collection before reporting on price trends.

Confirm before deleting a collection

Confirm before deleting a collection, since its tracked history is removed with it.

02 · ACTIONS

25 Countdown API actions, graded by risk.

Every Countdown 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.

countdown_api.get_account
Get Account Information
countdown_api.list_error_logs
List Error Logs
countdown_api.find_collection_requests
Find Collection Requests

write

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

countdown_api.create_destination
Create Destination
countdown_api.update_destination
Update Destination
countdown_api.create_collection_request
Create Collection Request
countdown_api.stop_collection
Stop Collection
countdown_api.requests_export_csv
Export Requests CSV
countdown_api.requests_export_json
Export Requests as JSON
countdown_api.stop_all_collections
Stop All Collections
countdown_api.core_api_send_request
eBay Autocomplete
countdown_api.results_get_result_set
Get Result Set
countdown_api.results_list_result_sets
List Result Sets
countdown_api.collections_get_collection
Get Collection
countdown_api.collections_list_collections
List Collections
countdown_api.collections_start_collection
Start Collection
countdown_api.collections_create_collection
Create a new collection
countdown_api.collections_update_collection
Update an existing collection
countdown_api.destinations_list_destinations
List Destinations

+ 2 MORE

destructive

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

countdown_api.delete_collection
Delete Collection
countdown_api.delete_destination
Delete Destination
countdown_api.delete_single_request
Delete Single Request
countdown_api.clear_all_requests
Clear Collection Requests

03 · HOW IT WORKS

Countdown API in three steps.

01Your users connect Countdown APIThey add their Countdown API api key on Arc0 Connect, under your brand. It goes straight into the vault.
02You set the rulesReads run, writes like “create Destination” can wait for the user, and “delete Collection” can be denied outright.
03Any agent can actYour agent calls Countdown 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('countdown_api', {
  read: 'allow',
  write: 'ask',        // create_destination
  destructive: 'deny',  // delete_collection
})

# 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 Countdown API connects.

Users add their Countdown 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 Countdown 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 Countdown API from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

More e-commerce apps.

Baselinker106 actions

Shippo95 actions

Shipengine66 actions

Proabono64 actions

ALL E-COMMERCE APPS →

07 · FAQ

Countdown API and Arc0, answered.

Q01

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

Yes. Connect Countdown 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 Countdown API actions you allow.

Q02

How do users connect Countdown API?

Users add their Countdown 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 Countdown API actions can my agent take?

25 in total: 3 read, 18 write and 4 destructive, such as “create Destination”. Your policies decide which of them each agent may call.

Q04

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

Yes. Actions like “delete Collection” 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 Countdown API too?

Yes. The same Countdown 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 Countdown API into your agent.

Your users connect Countdown API once, under your brand. Your agent gets 25 actions behind your policies, with every call on the record.

Connect Countdown API Browse all apps →

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