# Business Change Intelligence API – Event Evidence Expansion

> Business Change Intelligence API – Event Evidence Expansion is a paid API for AI agents from api.businesschanges.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-15).

Expands a list of business event IDs into dated, versioned primary-source evidence records for verification before citing or acting on them.

## Facts

- Endpoint: POST https://api.businesschanges.dev/v1/events/evidence
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/business-change-intelligence-api-event-evidence-expansion-1564bbc4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lLwQiAsx5KGfFQG80XlMw

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability business-change-intelligence-api-event-evidence-expansion-1564bbc4 -d '<json body>'
```

Example prompt: I just got back a list of business change event IDs from my lead search — can you pull up the primary-source evidence and dates for these three events: '3fa85f64-5717-4562-b3fc-2c963f66afa6', 'a1b2c3d4-e5f6-7890-ab12-cd34ef56gh78', and 'deadbeef-dead-beef-dead-beefdeadbeef'? I need to verify them before I reach out.

## When to prefer this

Use this endpoint after a lead search or business change discovery step, when you have a small set of specific event IDs (1–50) that need verification with primary-source evidence before being cited, shared, or acted upon. Prefer this over a broad search API when you already know the specific event IDs and need authoritative sourcing rather than discovery.

## Known failure modes

- Invalid UUID format returns a 400 validation error
- Array with zero items or more than 50 items returns a 400 out-of-range error
- Unknown or non-existent event IDs may return empty evidence records or 404
- Payment failure (x402) blocks the request before processing
- Partial results if only some event IDs have associated evidence

## How this service works

Expand selected business event IDs into dated, versioned primary-source evidence. Use after lead search to verify a small set of results before citing or acting on them.

## Output

Returns dated, versioned primary-source evidence records for each requested event ID, including source citations and timestamps that allow the agent to verify and cite specific business changes with confidence.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "eventIds": {
   "type": "array",
   "items": {
    "type": "string",
    "format": "uuid",
    "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$"
   },
   "maxItems": 50,
   "minItems": 1
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/business-change-intelligence-api-event-evidence-expansion-1564bbc4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.businesschanges.dev](https://www.zero.xyz/host/api.businesschanges.dev/llms.txt)