VAPI Integration

Add your Respeecher API key to VAPI

Go to https://dashboard.vapi.ai/settings/integrations/custom-credential and create a new custom credential with the following values:

• Authentication Type: Bearer Token
• Credential Name: Arbitrary, for example Respeecher API
• Token: <Your API Key>
• Header Name: X-Api-Key
• Include Bearer Prefix: No

Prepare a JSON request body

Create a text file vapi-custom-tts.json with the following content, substituting <CREDENTIAL_ID> with the ID (not the name, an ID is displayed after creation) of the custom credential from the previous step:

1
{
2
  "voice": {
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    "provider": "custom-voice",
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    "server": {
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      "url": "https://api.respeecher.com/v1/public/tts/en-rt/tts/vapi",
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      "credentialId": "<CREDENTIAL_ID>",
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      "timeoutSeconds": 30,
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      "headers": {
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        "X-Voice-JSON": "{\"id\": \"vikram\"}"
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      }
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    }
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  }
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}

Make a request to VAPI

Run the following command, substituting <ASSISTANT_ID> with the ID of your assistant and <VAPI_API_KEY> with your private VAPI API key from https://dashboard.vapi.ai/org/api-keys (not the Respeecher API key):

$
curl -X PATCH https://api.vapi.ai/assistant/<ASSISTANT_ID> \
>
     -H "Authorization: Bearer <VAPI_API_KEY>" \
>
     -H "Content-Type: application/json" \
>
     -d "$(cat vapi-custom-tts.json)"

Test and customize

At this point your VAPI assistant should have a low-latency Respeecher TTS voice. If the integration works, you can repeat steps 2 and 3 with another model (for example, substituting en-rt with ua-rt, see Models & Languages for more details) or another voice (the value of X-Voice-JSON is a JSON string that describes an object of the same format that is used in the other TTS endpoints).