# ProviderSignal License Events Historical

> ProviderSignal License Events Historical is a paid API for AI agents from providersignal.com, paid per call via x402, $1.5/call, status unknown (last checked 2026-09-14).

Retrieves the full historical log of license status changes, disciplinary actions, and address changes for a specific US healthcare provider by NPI number.

## Facts

- Endpoint: GET https://providersignal.com/api/v1/agent/license/events/historical
- Price: $1.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/providersignal-license-events-historical-7de204ec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8s_ST1Q3LtMvlK5cEd1AP

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 providersignal-license-events-historical-7de204ec
```

Example prompt: Pull the full license event history for the dentist with NPI 1376155820 — I want to see any status changes or disciplinary actions across all states.

## When to prefer this

Use this endpoint when you need the complete auditable timeline of license changes for a specific provider identified by NPI — particularly for due diligence, credentialing, compliance auditing, or acquisition workflows. It is preferable to point-in-time license lookups when you need historical context, trend analysis, or need to detect past disciplinary actions that may no longer be visible in current state.

## Known failure modes

- Invalid NPI format (must be exactly 10 digits) returns a validation error
- Unknown NPI with no records returns an empty events array with total_events: 0
- Payment failure via x402 or MPP returns HTTP 402 with payment requirements
- Rate limiting or quota exhaustion returns HTTP 429
- Source data temporarily unavailable may result in stale or partial citation envelope

## How this service works

Healthcare market intelligence API. Unified provider directory + acquisition signals + license-events feed across all 50 US states, derived from NPI + state dental boards + CMS Medicare + OIG LEIE + state Medicaid + HRSA HPSA designations. All responses ship a citation envelope (`meta.envelope_version`, `meta.source_attribution`, `meta.request`) so agents can verify source freshness without out-of-band validation. Paid `/api/v1/agent/*` endpoints accept two per-call rails on a single 402: x402 (USDC on Base mainnet) and MPP (Stripe card via a Shared Payment Token), plus Bearer-token subscription auth for existing API keys. See [/docs/agent-payments](/docs/agent-payments) for the full flow. See [/docs/fields](/docs/fields) for the field glossary and [/llms.txt](/llms.txt) for the LLM crawler index.

## Output

Returns a paginated array of license events for the specified provider, each with event type (e.g. STATUS_CHANGE, DISCIPLINARY_ACTION, ADDRESS_CHANGE), state, source system, old and new values, event date, and creation timestamp. Also includes total event count and a citation envelope with source attribution, last refresh timestamps, and schema versions for each underlying data source.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "npi"
     ],
     "properties": {
      "npi": {
       "type": "string",
       "pattern": "^\\d{10}$"
      },
      "limit": {
       "type": "integer",
       "default": 100,
       "maximum": 500,
       "minimum": 1
      },
      "event_type": {
       "type": "string",
       "description": "Optional filter — e.g. 'STATUS_CHANGE', 'DISCIPLINARY_ACTION', 'ADDRESS_CHANGE'"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "data",
      "error",
      "meta"
     ],
     "properties": {
      "data": {
       "type": "object",
       "properties": {
        "npi": {
         "type": "string"
        },
        "events": {
         "type": "array",
         "items": {
          "type": "object",
          "properties": {
           "state": {
            "type": [
             "string",
             "null"
            ]
           },
           "source": {
            "type": "string"
           },
           "new_value": {
            "type": [
             "string",
             "null"
            ]
           },
           "old_value": {
            "type": [
             "string",
             "null"
            ]
           },
           "created_at": {
            "type": "string"
           },
           "event_date": {
            "type": [
             "string",
             "null"
            ]
           },
           "event_type": {
            "type": "string"
           }
          },
          "additionalProperties": true
         }
        },
        "total_events": {
         "type": "integer"
        }
       }
      },
      "meta": {
       "type": "object",
       "required": [
        "envelope_version"
       ],
       "properties": {
        "request": {
         "type": "object",
         "properties": {
          "id": {
           "type": "string"
          },
          "endpoint": {

… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "npi": "1376155820",
   "events": [
    {
     "state": "TX",
     "source": "tsbde",
     "new_value": "Expired",
     "old_value": "Active",
     "created_at": "2025-11-01T03:14:22Z",
     "event_date": "2025-10-31",
     "event_type": "STATUS_CHANGE"
    }
   ],
   "total_events": 4
  },
  "meta": {
   "envelope_version": "1.0"
  },
  "error": null
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/providersignal-license-events-historical-7de204ec/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from providersignal.com](https://www.zero.xyz/host/providersignal.com/llms.txt)