# finmath ETH Address Validate

> finmath ETH Address Validate is a paid API for AI agents from finmath.qzqh5rrbkz.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Validates whether a given string is a well-formed Ethereum address

## Facts

- Endpoint: POST https://finmath.qzqh5rrbkz.workers.dev/v1/eth_address_validate
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/finmath-eth-address-validate-3c7e5ead
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qDCiIR3AYhc_eq1DoboMR

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 finmath-eth-address-validate-3c7e5ead -d '<json body>'
```

Example prompt: Check whether '0x742d35Cc6634C0532925a3b844Bc454e4438f44e' is a valid Ethereum address.

## When to prefer this

Use this endpoint when you need deterministic, exact Ethereum address validation rather than relying on an LLM's pattern-matching. Ideal before sending funds, registering an address, or ingesting user-supplied wallet addresses into a system. Prefer over ad-hoc regex checks when accuracy and auditability matter.

## Known failure modes

- Missing required 'address' field returns validation error
- Non-string input may cause schema rejection
- Payment failure (402) if USDC balance is insufficient
- Malformed request body returns 4xx error

## How this service works

Deterministic finance and crypto math for AI agents: TradFi (NPV, IRR, XIRR, Black-Scholes + Greeks, bonds, VaR, Sharpe) and DeFi (impermanent loss, perp liquidation, funding, Uniswap v3, health factor, cost basis). Exact, model-free arithmetic that LLMs get wrong — priced per call in USDC.

## Output

A result object indicating whether the provided address string is a valid Ethereum address (proper format and optional checksum), along with meta information about the call.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "address"
 ],
 "properties": {
  "address": {
   "type": "string",
   "description": "address"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "result",
  "meta"
 ],
 "properties": {
  "meta": {
   "type": "object"
  },
  "result": {}
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/finmath-eth-address-validate-3c7e5ead/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from finmath.qzqh5rrbkz.workers.dev](https://www.zero.xyz/host/finmath.qzqh5rrbkz.workers.dev/llms.txt)