# Agent Prices – Crypto Price Monitor (Check Endpoint)

> Agent Prices – Crypto Price Monitor (Check Endpoint) is a paid API for AI agents from agent-prices.annushka1190.workers.dev, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-13).

Checks real-time or 24h crypto price data for a given symbol with optional threshold alert logic, paying per-call in USDC via x402.

## Facts

- Endpoint: POST https://agent-prices.annushka1190.workers.dev/v1/monitor/check
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-prices-crypto-price-monitor-check-endpoint-88b98457
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GDTxTv7NXxqmX0uTyUpkq

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 agent-prices-crypto-price-monitor-check-endpoint-88b98457 -d '<json body>'
```

Example prompt: Check the current spot price of BTCUSDT and let me know if it's crossed $80,000 — use the crypto price monitor endpoint and pay the per-call fee automatically.

## When to prefer this

Choose this endpoint when you need lightweight, pay-per-call crypto price checks or threshold monitoring without setting up API keys or accounts. Ideal for AI agents that need on-demand spot prices or 24h ticker data for major crypto pairs, especially in automated workflows where cost predictability per-call matters. Prefer alternatives with WebSocket feeds if you need continuous streaming rather than discrete checks.

## Known failure modes

- Invalid or unsupported symbol returns an error or empty response
- Payment failure via x402 if USDC balance is insufficient
- Binance Vision data unavailability causes upstream fetch failure
- Malformed POST body missing required 'type' or 'method' fields returns a 400-level error
- Network timeout if Cloudflare Worker cold-starts under load

## How this service works

Crypto price monitoring for AI agents: spot price, 24h ticker, batch quotes, and threshold alerts. Public market data via Binance Vision. Pay with USDC via x402 — no API keys.

## Output

Returns a JSON object containing the symbol (e.g. 'BTCUSDT') and its current spot price (e.g. {"price": 78000, "symbol": "BTCUSDT"}), sourced from Binance Vision public market data. May also include 24h ticker data or threshold breach status depending on the request type.

## 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": {
    "body": {
     "type": "object"
    },
    "type": {
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ]
    },
    "bodyType": {
     "const": "json"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "price": 78000,
  "symbol": "BTCUSDT"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-prices-crypto-price-monitor-check-endpoint-88b98457/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent-prices.annushka1190.workers.dev](https://www.zero.xyz/host/agent-prices.annushka1190.workers.dev/llms.txt)