# Synapse Reference Prices

> Synapse Reference Prices is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Fetches current reference prices (price in USD and 24h change) for a given crypto or equity symbol via x402 pay-per-call

## Facts

- Endpoint: GET https://anibalb.duckdns.org/x402/reference-prices?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-reference-prices-f20d880b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zjFl87V2q_2XqCYKDMRB0

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 synapse-reference-prices-f20d880b
```

Example prompt: What's the current USD reference price and 24-hour change for bitcoin right now?

## When to prefer this

Choose this endpoint when you need a quick, keyless, pay-per-call reference price for a crypto or equity asset without signing up for a data provider account. Ideal for agents that need spot prices on-demand with micropayment billing on Base.

## Known failure modes

- Unknown or unsupported symbol returns an error or empty response
- Payment failure via x402 if USDC balance is insufficient
- Network timeout if the underlying price data source is unavailable
- Stale data if upstream market feeds are delayed

## How this service works

Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.

## Output

Returns a JSON object with the asset symbol, its current price in USD, and its 24-hour percentage price change (e.g. {symbol: 'bitcoin', price_usd: 65000, change_24h_pct: 1.2}).

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "symbol": "bitcoin",
  "price_usd": 65000,
  "change_24h_pct": 1.2
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-reference-prices-f20d880b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from anibalb.duckdns.org](https://www.zero.xyz/host/anibalb.duckdns.org/llms.txt)