# Coin Railz Portfolio Tracker

> Coin Railz Portfolio Tracker is a paid API for AI agents from coinrailz.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-15).

Returns real-time token holdings and total USD value for a wallet address across multiple EVM chains

## Facts

- Endpoint: POST https://coinrailz.com/x402/service/portfolio-tracker
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/coin-railz-portfolio-tracker-5bfebc9f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8EjLNJZ6PRFztZAY4C_mn

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 coin-railz-portfolio-tracker-5bfebc9f -d '<json body>'
```

Example prompt: What's the total USD value of my crypto portfolio for wallet 0xAbCd1234...5678 — check across Ethereum, Base, and Polygon and list all my token holdings?

## When to prefer this

Use this endpoint when you need a real-time, multi-chain snapshot of a wallet's token portfolio value in USD — especially when supporting portfolio management agents that need to aggregate holdings across Ethereum, Base, Polygon, and other EVM chains in a single call. Prefer over single-chain balance endpoints when cross-chain aggregation is needed.

## Known failure modes

- Invalid or malformed wallet address returns an error
- Unsupported chain name in the chains array causes a validation error
- Wallet with no holdings returns empty holdings array and zero totalValueUsd
- Network or RPC timeout for a specific chain may return partial results
- Payment failure (insufficient USDC) blocks the request entirely

## How this service works

Real-time multi-chain portfolio valuation - infrastructure for portfolio management agents (B2B2C infrastructure)

## Output

Returns an array of token holdings across the specified chains (including token name, amount, and chain) plus a totalValueUsd number representing the aggregate portfolio value in US dollars.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "walletAddress"
 ],
 "properties": {
  "chains": {
   "type": "array",
   "description": "Chains to track (default: ethereum, base, polygon)"
  },
  "walletAddress": {
   "type": "string",
   "description": "Wallet address to track"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "holdings": {
   "type": "array",
   "description": "Token holdings across chains"
  },
  "totalValueUsd": {
   "type": "number",
   "description": "Total portfolio value in USD"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/coin-railz-portfolio-tracker-5bfebc9f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from coinrailz.com](https://www.zero.xyz/host/coinrailz.com/llms.txt)