# Zerion API - List Swappable Fungible Tokens

> Zerion API - List Swappable Fungible Tokens is a paid API for AI agents from api.zerion.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-02).

Returns the list of fungible tokens (with chain filtering) that are available as swap inputs or outputs on Zerion's cross-chain swap infrastructure.

## Facts

- Endpoint: GET https://api.zerion.io/v1/swap/fungibles?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/zerion-api-list-swappable-fungible-tokens-6361133e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rSek7NOxoM8WUOD5esW_o

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 zerion-api-list-swappable-fungible-tokens-6361133e
```

Example prompt: What fungible tokens can I use on the output side of a swap on Arbitrum via Zerion?

## When to prefer this

Use this endpoint when you need to enumerate which fungible tokens are eligible for swapping on a specific chain via Zerion, especially as a prerequisite step before constructing a swap. Prefer this over generic token list endpoints when you specifically need swap-eligibility context and cross-chain filtering by direction (input, output, or both).

## Known failure modes

- Invalid chain_id value returns an error or empty data array
- Unsupported direction enum value may result in a 400 bad request
- No tokens found for an obscure or unsupported chain returns an empty data array
- Rate limiting or payment failure (x402) blocks the response
- Missing or malformed query parameters may default to Ethereum silently

## How this service works

Interpreted wallet data for more than 40 chains and Solana: portfolios, DeFi positions, PnL, transactions and NFTs. REST for apps, x402 pay-per-call for agents.

## Output

A paginated JSON:API array of fungible token resource objects, each with a unique ID, resource type, and attributes (token metadata). Also includes self and pagination links for navigating through the full result set.

## 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",
     "properties": {
      "direction": {
       "enum": [
        "input",
        "output",
        "both"
       ],
       "type": "string",
       "description": "Which side to list swappable tokens for (defaults to both)"
      },
      "input[chain_id]": {
       "type": "string",
       "description": "Input chain ID (defaults to ethereum)"
      },
      "output[chain_id]": {
       "type": "string",
       "description": "Output chain ID (defaults to ethereum)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "data"
     ],
     "properties": {
      "data": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "id": {
          "type": "string",
          "description": "Resource ID."
         },
         "type": {
          "type": "string",
          "description": "Resource type."
         },
         "attributes": {
          "type": "object",
          "description": "Resource attributes; see https://developers.zerion.io"
         }
        }
       },
       "description": "Array of JSON:API resource objects."
      },
      "links": {
       "type": "object",
       "description": "Self and pagination links."
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": [
   {
    "id": "<resource id>",
    "type": "<resource type>",
    "attributes": {}
   }
  ],
  "links": {
   "self": "https://api.zerion.io/v1/..."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/zerion-api-list-swappable-fungible-tokens-6361133e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.zerion.io](https://www.zero.xyz/host/api.zerion.io/llms.txt)