# WalCert Multichain Wallet Certificate

> WalCert Multichain Wallet Certificate is a paid API for AI agents from walcert.globalscoreagent.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Grades an EVM wallet's cross-chain footprint and on-chain longevity across multiple EVM networks, returning a signed A-F certificate.

## Facts

- Endpoint: POST https://walcert.globalscoreagent.com/v1/certificates/multichain
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/walcert-multichain-wallet-certificate-06ccfaa7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eI3R_RzbdZhsOW1M_8glX

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 walcert-multichain-wallet-certificate-06ccfaa7 -d '<json body>'
```

Example prompt: Can you get me a signed multichain certificate grading the chain footprint and longevity of wallet 0x742d35Cc6634C0532925a3b8D4C9B7e8e3d1Ac44 across EVM networks?

## When to prefer this

Choose this endpoint when you need a cross-chain view of a wallet's on-chain presence and tenure rather than a single-chain snapshot. Prefer it over the activity or portfolio sibling endpoints when the key question is 'how long and how broadly has this wallet been active across EVM ecosystems?' — especially useful for counterparty due diligence where longevity and multichain breadth signal legitimacy.

## Known failure modes

- Invalid or malformed wallet address (not 0x-prefixed or not 42 characters) returns a 400 error
- Wallet with zero on-chain history may return an F grade with minimal data
- Payment failure or insufficient USDC balance prevents certificate issuance
- Unsupported or unrecognized EVM address format causes rejection
- Rate limiting or service unavailability returns 429 or 503

## How this service works

Grade a wallet's chain footprint and longevity A-F across EVM networks. POST wallet_address; signed certificate. $0.05 USDC.

## Output

A signed certificate object containing an A-F grade reflecting the wallet's cross-chain footprint breadth (number and diversity of EVM networks active on) and longevity (age and continuity of on-chain activity). The certificate is cryptographically signed, suitable for audit or verification purposes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "wallet_address": {
   "type": "string",
   "description": "EVM wallet address (0x-prefixed, 42 chars)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/walcert-multichain-wallet-certificate-06ccfaa7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from walcert.globalscoreagent.com](https://www.zero.xyz/host/walcert.globalscoreagent.com/llms.txt)