# TickerLayer Indices Symbol Catalog

> TickerLayer Indices Symbol Catalog is a paid API for AI agents from x402.tickerlayer.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).

Returns the full catalog of market-qualified index symbols (e.g. US:SPX) available in the TickerLayer Indices dataset.

## Facts

- Endpoint: GET https://x402.tickerlayer.com/v1/indices/symbols
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tickerlayer-indices-symbol-catalog-fdecdc4c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4c03BVed6XYjGw4_gDge7

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 tickerlayer-indices-symbol-catalog-fdecdc4c
```

Example prompt: Can you pull up the full list of index symbols available on TickerLayer, including their market qualifiers like US:SPX?

## When to prefer this

Use this endpoint when you need to enumerate all supported index symbols before making downstream quote or data requests, or when you need to validate whether a specific index ticker exists in TickerLayer's coverage universe. Prefer this over the stocks, ETF, forex, commodities, or crypto sibling endpoints when the asset class is specifically a market index (e.g. S&P 500, Dow Jones, FTSE 100).

## Known failure modes

- Payment failure (402) if the x402 payment of $0.02 USDC is not successfully processed
- Empty or incomplete symbol list if the catalog is temporarily unavailable
- Network timeout if the endpoint is under load
- Malformed response if API versioning changes

## How this service works

Discover the current TickerLayer Indices symbol catalog. Stock symbols are market-qualified in COUNTRY_OR_MARKET:SYMBOL form such as US:AAPL.

## Output

An array of index symbol objects, each containing a market-qualified symbol string in COUNTRY_OR_MARKET:SYMBOL format (e.g. US:SPX) and a human-readable name for the index.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "symbols"
     ],
     "properties": {
      "symbols": {
       "type": "array",
       "items": {
        "type": "object",
        "required": [
         "symbol",
         "name"
        ],
        "properties": {
         "name": {
          "type": "string"
         },
         "symbol": {
          "type": "string",
          "pattern": "^[A-Za-z0-9][A-Za-z0-9.:%-]*$",
          "maxLength": 80,
          "minLength": 1
         }
        },
        "additionalProperties": true
       },
       "minItems": 1
      }
     },
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tickerlayer-indices-symbol-catalog-fdecdc4c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.tickerlayer.com](https://www.zero.xyz/host/x402.tickerlayer.com/llms.txt)