# FiatDock Base Address Lookup (Who)

> FiatDock Base Address Lookup (Who) is a paid API for AI agents from fiatdock.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-19).

Looks up identity information for a given Base blockchain address — resolving who owns or controls it.

## Facts

- Endpoint: GET https://fiatdock.com/s/svc_6b3c42f7-524c-4142-b57a-ecd1e17cbaaf?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fiatdock-base-address-lookup-who-6a861f4f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kHEPYuI3E61262NHPvk9x

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 fiatdock-base-address-lookup-who-6a861f4f
```

Example prompt: Can you look up who owns the Base address 0x4838B106FCe9647Bdf1E7877BF73cE8B0BAD5f97 — I want to know the identity or profile associated with it.

## When to prefer this

Choose this endpoint when you need to identify the human or entity behind a Base blockchain address and want a pay-per-call, no-subscription approach. Prefer this over ENS/Basename reverse resolution (a sibling endpoint) when you need richer 'who' identity context rather than just a name-to-address mapping. Best suited for due diligence, transaction labeling, and wallet profiling on Base.

## Known failure modes

- Address not found or has no associated identity — returns empty or null result
- Invalid address format passed — returns argument/validation error (call still billed)
- Required MCP tool arguments missing — returns argument error (call still billed)
- Network or upstream service timeout
- Unknown or unsupported address type

## How this service works

Pay-per-call: Base address lookup (who)

## Output

Returns identity or ownership information associated with the given Base blockchain address, such as associated names, labels, or profile metadata that help identify who controls the wallet.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fiatdock-base-address-lookup-who-6a861f4f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fiatdock.com](https://www.zero.xyz/host/fiatdock.com/llms.txt)