# Einstein AI x402 API – Virtual Pool Token Tracker (Base Chain)

> Einstein AI x402 API – Virtual Pool Token Tracker (Base Chain) is a paid API for AI agents from api.relai.fi, paid per call via x402, $0.550000/call, status unknown (last checked 2026-09-14).

Returns a list of tokens paired with a virtual token on the Base chain, with optional filtering by time period and result limit.

## Facts

- Endpoint: POST https://api.relai.fi/relay/1769629274857/x402/bitquery/virtual-pools
- Price: $0.550000/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/einstein-ai-x402-api-virtual-pool-token-tracker-base-chain-afb29d52
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4cY3vzntLyDMq38yadxEm

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 einstein-ai-x402-api-virtual-pool-token-tracker-base-chain-afb29d52 -d '<json body>'
```

Example prompt: Show me the top 20 tokens paired with virtual token on Base over the last 24 hours — I want to see which pools are most active.

## When to prefer this

Use this endpoint when you need to discover or monitor tokens that are paired with a virtual token on the Base chain, especially for DeFi analytics, pool tracking, or market research. Prefer this over generic DEX APIs when you specifically want virtual token pair data on Base with time-period filtering.

## Known failure modes

- Invalid timeperiod enum value returns validation error
- Limit exceeding 500 may be rejected or capped
- Chain not supported (only 'base' is supported) returns error
- Payment of 0.55 USDC not fulfilled results in 402 response
- Network timeout if Bitquery upstream is slow

## How this service works

Track tokens paired with virtual token. Supported chains: base. Default chain: base. Required params: none (chain/limit/timeperiod are optional and defaulted).

## Output

A list of tokens paired with the virtual token on the Base chain, including pool and market data for the requested time period and up to the specified result limit.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "string",
   "description": "Maximum number of results to return (default: 10, max: 500)"
  },
  "timeperiod": {
   "enum": [
    "1h",
    "4h",
    "24h",
    "7d",
    "30d"
   ],
   "type": "string",
   "description": "Time period for analysis (e.g., 1h, 24h, 7d, 30d)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/einstein-ai-x402-api-virtual-pool-token-tracker-base-chain-afb29d52/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.relai.fi](https://www.zero.xyz/host/api.relai.fi/llms.txt)