# VAPE Chain Overview

> VAPE Chain Overview is a paid API for AI agents from vape-x402.vapex402.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).

Returns the headline TVL (Total Value Locked) and global rank for a specified blockchain (defaults to Base).

## Facts

- Endpoint: GET https://vape-x402.vapex402.workers.dev/data/chain_overview
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vape-chain-overview-e9bf3605
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_q9ayOOhsVtJKsYOSsHoRt

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 vape-chain-overview-e9bf3605
```

Example prompt: What's the current TVL on Base chain and how does it rank among all tracked chains — give me VAPE's chain overview for Base.

## When to prefer this

Use this endpoint when you need a quick, high-level snapshot of a chain's TVL and relative rank — ideal for dashboards, DeFi comparisons, or answering 'how big is chain X?' questions. Prefer this over chain_protocols or chain_fees when you only need the headline number, not per-protocol breakdowns.

## Known failure modes

- Unknown chain name returns an error or empty result
- Network timeout if upstream DeFi data provider is unavailable
- Invalid query parameter format may return a 400 error
- Payment not fulfilled (x402) returns 402 Payment Required

## How this service works

VAPE chain_overview — A chain's headline TVL and its rank among all tracked chains (default Base).

## Output

Returns the chain's headline Total Value Locked (TVL) figure and its numeric rank relative to all other chains tracked by VAPE, for the specified chain (defaulting to Base).

## 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": {
      "chain": {
       "type": "string",
       "description": "chain display name, default 'Base'"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "rank": 7,
  "chain": "Base",
  "tvl_usd": 4100000000,
  "total_chains": 300
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vape-chain-overview-e9bf3605/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vape-x402.vapex402.workers.dev](https://www.zero.xyz/host/vape-x402.vapex402.workers.dev/llms.txt)