# NEXUS Agent Services – Streaming Crypto Price Feed

> NEXUS Agent Services – Streaming Crypto Price Feed is a paid API for AI agents from nexus-agent-xa12.onrender.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Streams real-time cryptocurrency price data (USD price + 24h change) for one or more symbols via a pay-per-call HTTP endpoint using x402 USDC micropayments

## Facts

- Endpoint: GET https://nexus-agent-xa12.onrender.com/stream/prices
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/nexus-agent-services-streaming-crypto-price-feed-9ce3a1de
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O_iggl9IDGf34NNr8xDjk

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 nexus-agent-services-streaming-crypto-price-feed-9ce3a1de
```

Example prompt: Stream live prices for BTC and ETH from NEXUS — give me the current USD price and 24-hour change for each, running for 30 seconds.

## When to prefer this

Use this endpoint when you need real-time or near-real-time cryptocurrency price data with 24h change, are comfortable paying $0.01 USDC per call via x402 on Base, and want a streamable HTTP response compatible with MCP tooling. Prefer this over REST polling APIs when you need continuous tick-based streaming or when your agent stack already supports x402 micropayment flows.

## Known failure modes

- Payment not provided or rejected (402 Payment Required) — agent must pay 0.01 USDC via x402 on Base before data is returned
- Invalid or unrecognized symbol in 'symbols' query param — may return empty prices map or error
- Duration parameter out of range — stream may close early or return no ticks
- Network timeout or Render.com cold-start delay — connection may drop before first tick
- No query params provided — endpoint may return default symbols or an error

## How this service works

Pay-per-call financial data. Streamable HTTP MCP. x402 USDC on Base. Not financial advice.

## Output

A streamable HTTP response returning JSON ticks, each containing: a tick counter, a prices map keyed by symbol (e.g. BTC, ETH) with USD price and 24h percentage change, and a timestamp. Costs $0.01 USDC per call paid via x402 on 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "symbols": {
       "type": "string"
      },
      "duration": {
       "type": "integer"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "tick": 1,
  "prices": {
   "BTC": {
    "usd": 77000,
    "change_24h": -0.5
   }
  },
  "timestamp": "..."
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/nexus-agent-services-streaming-crypto-price-feed-9ce3a1de/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from nexus-agent-xa12.onrender.com](https://www.zero.xyz/host/nexus-agent-xa12.onrender.com/llms.txt)