# DevX Agent Tools – Crypto Address Validation

> DevX Agent Tools – Crypto Address Validation is a paid API for AI agents from devx-x402-tools.nextill-pos.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).

Validates a cryptocurrency address string and returns its type, encoding, address family, and validity across Bitcoin, Ethereum, and other chains

## Facts

- Endpoint: GET https://devx-x402-tools.nextill-pos.workers.dev/v1/address/check?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/devx-agent-tools-crypto-address-validation-0c8b80fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MOQ4_bRpztLjhPti1U4ym

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 devx-agent-tools-crypto-address-validation-0c8b80fb
```

Example prompt: Can you check whether bc1qpl7q6jfhfcd2akg3n2p3ucyl3fy6wygkzp8p2w is a valid Bitcoin address and tell me what type it is?

## When to prefer this

Choose this endpoint when you need lightweight, pay-per-call crypto address validation with no API key or signup, especially within an agentic workflow already using x402/USDC micropayments on Base. It is not billed on invalid input, making it safe to use speculatively. Prefer it over full on-chain lookups when you only need format/encoding validation rather than balance or transaction history.

## Known failure modes

- Invalid or malformed address string returns valid:false with empty or no matches
- Missing required 'address' query parameter returns an error (no charge)
- Upstream processing failure returns an error response and is not billed
- Unrecognized address format may return valid:false without family classification

## How this service works

Pay-per-call utilities for AI agents, no API key or signup: read any web page as clean Markdown ($0.002), link/SEO metadata ($0.001), domain DNS + SPF/DMARC email-security audit ($0.003), ERC-20 token safety pre-check ($0.005), crypto address validation, on-chain payment verification, EIP-681/BIP21/Solana Pay payment requests with QR, multichain USDC balances ($0.01). x402 v2, USDC on Base. Invalid input / upstream failure is never charged.

## Output

A JSON object containing the original input address, a top-level 'valid' boolean, and a 'matches' array. Each match includes the address type (e.g. P2WPKH, P2PKH), validity, blockchain family (e.g. bitcoin, ethereum), encoding scheme (e.g. bech32, base58), and optionally witness version. Multiple matches indicate the address could be valid on more than one chain or format.

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "input": "bc1qpl7q6jfhfcd2akg3n2p3ucyl3fy6wygkzp8p2w",
  "valid": true,
  "matches": [
   {
    "type": "P2WPKH",
    "valid": true,
    "family": "bitcoin",
    "encoding": "bech32",
    "witness_version": 0
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/devx-agent-tools-crypto-address-validation-0c8b80fb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from devx-x402-tools.nextill-pos.workers.dev](https://www.zero.xyz/host/devx-x402-tools.nextill-pos.workers.dev/llms.txt)