# ProviderSignal DSO Affiliation Lookup

> ProviderSignal DSO Affiliation Lookup is a paid API for AI agents from providersignal.com, paid per call via x402, $1/call, status unknown (last checked 2026-09-14).

Given a 10-digit NPI, returns whether the dental provider is affiliated with a Dental Service Organization (DSO), the DSO name, cluster size, co-located peers, and inferred practice name.

## Facts

- Endpoint: GET https://providersignal.com/api/v1/agent/dso/affiliation
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/providersignal-dso-affiliation-lookup-4e7054b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WbpHWq0Z6a0WsLfY3BMOF

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-dso-affiliation-lookup-4e7054b5
```

Example prompt: Can you check whether NPI 1376155820 is affiliated with a DSO, and if so, tell me the DSO name, how big their network is, and the inferred practice name?

## When to prefer this

Use this endpoint when you need a fast, single-provider DSO affiliation signal with source-cited provenance and a known per-call cost. It is purpose-built for dental market intelligence workflows — superior to generic NPI registries that lack DSO clustering, affiliation labels, or co-location data. Prefer it over manual board lookups when you need machine-readable DSO network size and sibling providers in a single call.

## Known failure modes

- Invalid or non-existent NPI returns error object with code and message
- NPI exists but belongs to a non-dental provider — DSO fields may be null
- Payment failure (402) if x402 USDC payment or MPP token is invalid or insufficient
- Rate limiting or auth failure if Bearer token is expired or missing
- Data may lag by days if underlying NPI or state board sources haven't refreshed recently

## 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 JSON object with: is_dso (boolean), dso_label (string or null), dso_cluster_size (integer or null indicating total network size), co_located_count (peers at the same address), inferred_practice_name, a siblings_sample array of co-located provider NPIs with state and name, plus a meta envelope with source attribution, data freshness timestamps, and billing details.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "npi"
     ],
     "properties": {
      "npi": {
       "type": "string",
       "pattern": "^\\d{10}$",
       "description": "10-digit NPI"
      }
     }
    }
   },
   "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"
        },
        "is_dso": {
         "type": "boolean"
        },
        "dso_label": {
         "type": [
          "string",
          "null"
         ]
        },
        "siblings_sample": {
         "type": "array",
         "items": {
          "type": "object",
          "properties": {
           "npi": {
            "type": "string"
           },
           "state": {
            "type": [
             "string",
             "null"
            ]
           },
           "last_name": {
            "type": [
             "string",
             "null"
            ]
           },
           "first_name": {
            "type": [
             "string",
             "null"
            ]
           }
          }
         }
        },
        "co_located_count": {
         "type": [
          "integer",
          "null"
         ]
        },
        "dso_cluster_size": {
         "type": [
          "integer",
          "null"
         ]
        },
        "inferred_practice_name": {
         "type": [
          "string",
          "null"
         ]
        }
       },
       "additionalProperties": true
      },
      "meta": {
       "type": "object",
       "required": [
        "envelope_version"
       ],
       "properties": {
        "request": {
         "type": "object",
         "properties": {
          "id": {
           "type": "string"
          },
          "endpoint": {
           "type": "string"
          },
          "billed_credits": 
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {
   "npi": "1376155820",
   "is_dso": true,
   "dso_label": "Heartland Dental",
   "siblings_sample": [
    {
     "npi": "1234567890",
     "state": "AL",
     "last_name": "DOE",
     "first_name": "JOHN"
    }
   ],
   "co_located_count": 3,
   "dso_cluster_size": 2847,
   "inferred_practice_name": "Smile Dental of Baytown"
  },
  "meta": {
   "envelope_version": "1.0"
  },
  "error": null
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/providersignal-dso-affiliation-lookup-4e7054b5/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)