> **For AI agents:** this page is a focused, LLM-optimized view of a
> single Fiber AI operation. Before calling it, fetch the routing
> instructions at [`https://api.fiber.ai/llms.txt`](https://api.fiber.ai/llms.txt) and the full operation
> index at [`https://api.fiber.ai/ai-docs/index.md`](https://api.fiber.ai/ai-docs/index.md).

# buildAudience

`POST /v1/audiences/{audienceId}/build`

**Tags:** `Audiences`

Build audience from search parameters

**Endpoint:** `https://api.fiber.ai/v1/audiences/{audienceId}/build`

## Description

Triggers the audience building process. This runs a company and prospect search based on the configured search parameters and saves results to the database. The build runs asynchronously - use the get-audience-status endpoint to poll for completion. Status transitions: DRAFT → BUILDING → NORMAL (success) or FAILED (error).

⚡ Rate limit: 30 requests per 1 minute

💰 Cost: Credits are charged after the build completes based on results: 1 credits per company and 1 credits per profile found. ⓘ

## Parameters

| Name | In | Required | Description |
| --- | --- | --- | --- |
| `audienceId` | path | yes | The unique ID of the audience. |

## Request body (JSON Schema)

```json
{
  "type": "object",
  "properties": {
    "apiKey": {
      "type": "string",
      "description": "Your Fiber API key"
    }
  },
  "required": [
    "apiKey"
  ]
}
```

## Response — success (JSON Schema)

```json
{
  "type": "object",
  "properties": {
    "output": {
      "type": "object",
      "properties": {
        "audienceId": {
          "type": "string",
          "description": "The unique ID of the audience."
        },
        "status": {
          "type": "string",
          "description": "The status indicating the build has started.",
          "enum": [
            "BUILDING"
          ]
        },
        "message": {
          "type": "string",
          "description": "A human-readable message about the build status."
        }
      },
      "required": [
        "audienceId",
        "status",
        "message"
      ]
    },
    "chargeInfo": {
      "oneOf": [
        {
          "type": "object",
          "properties": {
            "method": {
              "type": "string",
              "enum": [
                "charged-now"
              ]
            },
            "creditsCharged": {
              "type": "number"
            },
            "lowCreditAlert": {
              "type": [
                "object",
                "null"
              ],
              "properties": {
                "getMoreCreditsUrl": {
                  "type": "string",
                  "format": "uri",
                  "description": "URL to top up credits or restart billing cycle to get fresh credits."
                },
                "message": {
                  "type": "string",
                  "description": "Human-readable credits warning."
                },
                "availableCredits": {
                  "type": "number",
                  "description": "Number of credits remaining in the current billing period."
                }
              },
              "required": [
                "getMoreCreditsUrl",
                "message",
                "availableCredits"
              ],
              "description": "Contains a link to get more credits, a warning message, and the remaining credit count."
            }
          },
          "required": [
            "method",
            "creditsCharged"
          ],
          "description": "Credits were charged immediately for this operation"
        },
        {
          "type": "object",
          "properties": {
            "method": {
              "type": "string",
              "enum": [
                "charging-later"
              ]
            },
            "message": {
              "type": "string"
            },
            "lowCreditAlert": {
              "type": [
                "object",
                "null"
              ],
              "properties": {
                "getMoreCreditsUrl": {
                  "type": "string",
                  "format": "uri",
                  "description": "URL to top up credits or restart billing cycle to get fresh credits."
                },
                "message": {
                  "type": "string",
                  "description": "Human-readable credits warning."
                },
                "availableCredits": {
                  "type": "number",
                  "description": "Number of credits remaining in the current billing period."
                }
              },
              "required": [
                "getMoreCreditsUrl",
                "message",
                "availableCredits"
              ],
              "description": "Contains a link to get more credits, a warning message, and the remaining credit count."
            }
          },
          "required": [
            "method",
            "message"
          ],
          "description": "Credits will be charged after the operation completes"
        },
        {
          "type": "object",
          "properties": {
            "method": {
              "type": "string",
              "enum": [
                "charged-for-async-process"
              ]
            },
            "creditsCharged": {
              "type": "number"
            },
            "message": {
              "type": "string"
            },
            "lowCreditAlert": {
              "type": [
                "object",
                "null"
              ],
              "properties": {
                "getMoreCreditsUrl": {
                  "type": "string",
                  "format": "uri",
                  "description": "URL to top up credits or restart billing cycle to get fresh credits."
                },
                "message": {
                  "type": "string",
                  "description": "Human-readable credits warning."
                },
                "availableCredits": {
                  "type": "number",
                  "description": "Number of credits remaining in the current billing period."
                }
              },
              "required": [
                "getMoreCreditsUrl",
                "message",
                "availableCredits"
              ],
              "description": "Contains a link to get more credits, a warning message, and the remaining credit count."
            }
          },
          "required": [
            "method",
            "creditsCharged",
            "message"
          ],
          "description": "Credits that were charged for an asynchronous operation"
        },
        {
          "type": "object",
          "properties": {
            "method": {
              "type": "string",
              "enum": [
                "free"
              ]
            },
            "message": {
              "type": "string"
            },
            "lowCreditAlert": {
              "type": [
                "object",
                "null"
              ],
              "properties": {
                "getMoreCreditsUrl": {
                  "type": "string",
                  "format": "uri",
                  "description": "URL to top up credits or restart billing cycle to get fresh credits."
                },
                "message": {
                  "type": "string",
                  "description": "Human-readable credits warning."
                },
                "availableCredits": {
                  "type": "number",
                  "description": "Number of credits remaining in the current billing period."
                }
              },
              "required": [
                "getMoreCreditsUrl",
                "message",
                "availableCredits"
              ],
              "description": "Contains a link to get more credits, a warning message, and the remaining credit count."
            }
          },
          "required": [
            "method",
            "message"
          ],
          "description": "No credits were charged for this operation"
        },
        {
          "type": "object",
          "properties": {
            "method": {
              "type": "string",
              "enum": [
                "credits-refunded"
              ]
            },
            "creditsRefunded": {
              "type": "number"
            },
            "message": {
              "type": "string"
            },
            "lowCreditAlert": {
              "type": [
                "object",
                "null"
              ],
              "properties": {
                "getMoreCreditsUrl": {
                  "type": "string",
                  "format": "uri",
                  "description": "URL to top up credits or restart billing cycle to get fresh credits."
                },
                "message": {
                  "type": "string",
                  "description": "Human-readable credits warning."
                },
                "availableCredits": {
                  "type": "number",
                  "description": "Number of credits remaining in the current billing period."
                }
              },
              "required": [
                "getMoreCreditsUrl",
                "message",
                "availableCredits"
              ],
              "description": "Contains a link to get more credits, a warning message, and the remaining credit count."
            }
          },
          "required": [
            "method",
            "creditsRefunded",
            "message"
          ],
          "description": "Credits were refunded for this operation"
        }
      ]
    },
    "warnings": {
      "type": [
        "array",
        "null"
      ],
      "items": {
        "type": "object",
        "properties": {
          "field": {
            "type": "string",
            "description": "Full path to extraneous field (e.g., 'searchParams.ExtraField')"
          },
          "message": {
            "type": "string",
            "description": "Warning message"
          }
        },
        "required": [
          "field",
          "message"
        ]
      },
      "description": "Warnings about extraneous fields in request"
    },
    "advice": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "default": [],
      "description": "Tips, recommendations, and suggestions for using this API effectively."
    }
  },
  "required": [
    "output",
    "chargeInfo",
    "advice"
  ],
  "additionalProperties": false
}
```

---

Canonical JSON: [`https://api.fiber.ai/openapi.json`](https://api.fiber.ai/openapi.json)
Operation index: [`https://api.fiber.ai/ai-docs/index.md`](https://api.fiber.ai/ai-docs/index.md)