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Castingwords for AI agents

CastingWords offers human-powered transcription, converting recorded audio into accurate text through a straightforward API rather than automated speech recognition alone. 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 CastingwordsSee the 9 actions ↓
Video and audioAPI keyMCP + RESTcastingwords.com
AUDIT LOG · CASTINGWORDSPOLICY: acme-support
09:41:07 · claude · u_8f2read
castingwords.get_webhook
Get registered webhook URL✓ allowed · 212ms
09:41:08 · claude · u_8f2read
castingwords.test_webhook
Test Webhook Call✓ allowed · 164ms
09:41:09 · claude · u_8f2write
castingwords.sku_list
List Available SKUs✓ approved · approved by user
09:41:12 · claude · u_8f2destructive
castingwords.cancel_audiofile
Cancel and Refund Audio File✕ blocked · policy: deny
EVERY CASTINGWORDS CALL, ON THE RECORD
01 · USE CASES

What agents do in Castingwords.

01

Order a transcript

Order a transcript for a recorded audio file, ready to receive once transcribers finish it.

02

Check a transcript's progress

Check the account's prepay balance before ordering another batch of audio transcripts.

03

Confirm before canceling an order

Cancel and refund an audio file's order before transcription work has started on it.

02 · ACTIONS

9 Castingwords actions, graded by risk.

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

read

4

Look things up. Allowed by default.

  • castingwords.get_webhook
    Get registered webhook URL
  • castingwords.get_transcript
    Get Transcript
  • castingwords.get_prepay_balance
    Get Prepay Balance
  • castingwords.test_webhook
    Test Webhook Call

write

4

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

  • castingwords.sku_list
    List Available SKUs
  • castingwords.order_upgrades
    Order Upgrades
  • castingwords.order_transcript
    Order Transcript
  • castingwords.register_webhook
    Register Webhook

destructive

1

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

  • castingwords.cancel_audiofile
    Cancel and Refund Audio File
03 · HOW IT WORKS

Castingwords in three steps.

  1. 01Your users connect CastingwordsThey add their Castingwords api key on Arc0 Connect, under your brand. It goes straight into the vault.
  2. 02You set the rulesReads run, writes like “list Available SKUs” can wait for the user, and “cancel and Refund Audio File” can be denied outright.
  3. 03Any agent can actYour agent calls Castingwords 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('castingwords', {
  read: 'allow',
  write: 'ask',        // sku_list
  destructive: 'deny',  // cancel_audiofile
})

# 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 Castingwords connects.

Users add their Castingwords 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 Castingwords 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 Castingwords from any agent.

Claude
ChatGPT
Cursor
Codex
VS Code
OpenAI Agents SDK
Claude Agent SDK
Vercel AI SDK
Mastra
LangGraph
06 · RELATED

More video and audio apps.

YouTube51 actionsAmara30 actionsTwitch131 actionsSoundCloud52 actionsVimeo50 actionsRev AI36 actionsListen Notes26 actionsShotstack24 actions
ALL VIDEO AND AUDIO APPS →
07 · FAQ

Castingwords and Arc0, answered.

Q01

Can I use Castingwords with Claude, ChatGPT or Cursor?

Yes. Connect Castingwords 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 Castingwords actions you allow.

Q02

How do users connect Castingwords?

Users add their Castingwords 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 Castingwords actions can my agent take?

9 in total: 4 read, 4 write and 1 destructive, such as “list Available SKUs”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Castingwords?

Yes. Actions like “cancel and Refund Audio File” 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 Castingwords too?

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

Get started

Plug Castingwords into your agent.

Your users connect Castingwords once, under your brand. Your agent gets 9 actions behind your policies, with every call on the record.

Connect CastingwordsBrowse all apps →

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