> ## Documentation Index
> Fetch the complete documentation index at: https://developers.zerion.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Endpoints & Schema

> Overview of all Zerion API endpoint categories and response structure.

The Zerion API provides real-time, normalized access to onchain data through RESTful endpoints. All requests go to `https://api.zerion.io` and require [authentication](/authentication) via HTTP Basic Auth. Responses follow the [JSON:API](https://jsonapi.org/) specification.

## Endpoint categories

### [Wallets](/api-reference/wallets/get-wallet-portfolio)

Portfolio, positions, transactions, PnL, and NFTs — all scoped to a wallet address. This is the core of the API. Positions include both fungible tokens and DeFi protocol positions. NFT data is split into individual holdings, collections, and a portfolio summary.

All positions and transactions come with icons, labels, links, metadata, and relationships. Everything is ready to be immediately used in interfaces without additional interpretation or enrichment.

### [Fungibles](/api-reference/fungibles/get-list-of-fungible-assets)

Token metadata, pricing, and market data. Search and filter across all supported tokens, look up by Zerion ID or by chain and contract address, and fetch historical price charts.

### [Chains](/api-reference/chains/get-list-of-all-chains)

The full list of supported blockchains with metadata. Useful for populating chain selectors or validating chain IDs before making other calls.

### [NFTs](/api-reference/nfts/get-list-of-nfts)

Look up individual NFTs by reference or unique ID, with support for batch fetching.

### [Swap & Bridge](/api-reference/swap/get-swap-and-bridge-quotes)

Quotes for token swaps and cross-chain bridges, routed across DEXs and bridge protocols. First check which tokens are available for a route, then request offers.

### [Gas Prices](/api-reference/gas/get-list-of-all-available-gas-prices)

Current gas price estimates across all supported chains. Useful for displaying fee estimates or optimizing transaction timing.

### [DApps](/api-reference/dapps/get-list-of-dapps)

Metadata for decentralized applications — names, icons, and categories. DApp info is also embedded in position and transaction responses to provide context.

### [Subscriptions (Webhooks)](/api-reference/subscriptions-to-transactions/create-subscription)

Push-based notifications for wallet activity — no polling required. Create subscriptions, manage which wallets and chains to monitor, and update webhook URLs.

## Response structure

Every response follows a consistent [JSON:API](https://jsonapi.org/) format:

```json theme={null}
{
  "links": {
    "self": "https://api.zerion.io/v1/...",
    "next": "https://api.zerion.io/v1/...?page[after]=..."
  },
  "data": {
    "type": "positions",
    "id": "unique-id",
    "attributes": { ... },
    "relationships": { ... }
  }
}
```

| Field           | Description                                                        |
| --------------- | ------------------------------------------------------------------ |
| `links`         | Pagination — `self` for the current page, `next` for the next page |
| `data`          | A single resource object or an array of them                       |
| `type`          | Resource type (e.g., `positions`, `transactions`, `fungibles`)     |
| `id`            | Unique identifier for the resource                                 |
| `attributes`    | The resource's data fields                                         |
| `relationships` | Links to related resources                                         |

## Next steps

<CardGroup cols={3}>
  <Card title="Pagination & Filtering" icon="filter" href="/pagination-and-filtering">
    Paginate results and apply filters.
  </Card>

  <Card title="Error Handling" icon="circle-exclamation" href="/error-handling">
    Error codes and how to handle them.
  </Card>

  <Card title="Rate Limits" icon="gauge" href="/rate-limits">
    Request limits and how to stay within them.
  </Card>
</CardGroup>