# Crypto Fear & Greed Index — Base Network

> Crypto Fear & Greed Index — Base Network is a paid API for AI agents from agentkit-x402-buy.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Returns the current crypto Fear & Greed index score and label via a micropayment-gated GET request on the Base network.

## Facts

- Endpoint: GET https://agentkit-x402-buy.vercel.app/api/fear-greed
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/crypto-fear-greed-index-base-network-bbf17210
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Kvc2mk_4o9qv5w9kdYxH3

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 crypto-fear-greed-index-base-network-bbf17210
```

Example prompt: What's the current crypto fear and greed index score right now — is the market fearful or greedy?

## When to prefer this

Choose this endpoint when you need a quick, no-account-required crypto sentiment index score using a micropayment model on the Base network. It is ideal for AI agents with USDC wallets on Base that need a lightweight, instant sentiment signal without API key registration. Prefer alternatives if you need historical fear/greed data, granular asset-level sentiment, or do not have Base USDC for micropayments.

## Known failure modes

- Payment failure: insufficient USDC balance or failed x402 micropayment results in 402 Payment Required
- Network error: Base network congestion may delay or fail the payment transaction
- Invalid format parameter: unsupported query param value may return malformed response
- Service unavailability: Vercel deployment downtime returns 5xx error
- Stale data: index value may reflect a recent but not real-time snapshot depending on upstream data provider

## How this service works

Instant Base wallet health brief. Pay $0.50 USDC via x402. No account.

## Output

Returns a JSON object with: a numeric fear_greed score (e.g. 27), a human-readable sentiment label (e.g. 'Fear'), the seller wallet address on Base, and the network identifier (eip155:8453). The score typically ranges 0–100 where low values indicate fear and high values indicate greed.

## 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",
     "properties": {
      "format": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "label": "Fear",
  "seller": "0xEb76f3442EAF192EBdDbc1F7EeBD59CdE5e00D35",
  "network": "eip155:8453",
  "fear_greed": 27
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/crypto-fear-greed-index-base-network-bbf17210/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentkit-x402-buy.vercel.app](https://www.zero.xyz/host/agentkit-x402-buy.vercel.app/llms.txt)