# Aether Base Token Price Lookup

> Aether Base Token Price Lookup is a paid API for AI agents from aether-x402.vercel.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-12).

Returns the current USD price and best liquidity pool for a given ERC-20 token contract address on the Base blockchain.

## Facts

- Endpoint: POST https://aether-x402.vercel.app/v1/base/price?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/aether-base-token-price-lookup-55454968
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_y2jT9TLZCpwjMNaV2HebO

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 aether-base-token-price-lookup-55454968 -d '<json body>'
```

Example prompt: What's the current onchain USD price and best liquidity pool for the Base token at contract address 0x940181a94A35A4569E4529A3CDfB74e38FD98631?

## When to prefer this

Use this endpoint when you need real-time onchain token price and liquidity data specifically for Base network ERC-20 tokens, paid per-call via x402/USDC micropayment. Prefer this over centralized price APIs when you need trustless, DEX-sourced pricing without a subscription, or when building agents that autonomously pay for data using USDC on Base.

## Known failure modes

- Invalid or non-ERC-20 contract address returns an error or empty result
- Token not traded on any Base DEX returns no price data
- Payment failure via x402/USDC results in 402 response blocking data access
- Newly deployed tokens with insufficient liquidity may return null or zero values
- Incorrect address format (not matching ^0x[0-9a-fA-F]{40}$) returns a validation error

## How this service works

Pay-per-call Base onchain data, token risk verdicts and x402 payability audits over x402 (USDC on Base).

## Output

Returns a JSON object containing the token's ticker symbol, current USD price, the name of the best DEX pool (e.g. Aerodrome), and total liquidity in USD for that pool.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "token": {
   "type": "string",
   "pattern": "^0x[0-9a-fA-F]{40}$"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "symbol": "AERO",
  "bestPool": {
   "dex": "aerodrome"
  },
  "priceUsd": 0.81,
  "liquidityUsd": 47000000
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/aether-base-token-price-lookup-55454968/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from aether-x402.vercel.app](https://www.zero.xyz/host/aether-x402.vercel.app/llms.txt)