# WalCert Activity Certificate — 15-Day Wallet Behavior Grader

> WalCert Activity Certificate — 15-Day Wallet Behavior Grader is a paid API for AI agents from walcert.globalscoreagent.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Grades a wallet's 15-day on-chain activity (counterparties, concentration, velocity, bot-like behavior) on an A–F scale and returns a signed certificate for $0.05 USDC.

## Facts

- Endpoint: POST https://walcert.globalscoreagent.com/v1/certificates/activity
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/walcert-activity-certificate-15-day-wallet-behavior-grader-90247e3d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8F4vN-JPQmq_3axorHc2D

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-activity-certificate-15-day-wallet-behavior-grader-90247e3d -d '<json body>'
```

Example prompt: Before I send this payment, can you get an activity grade for wallet 0x4f3edf983ac636a65a842ce7c78d9aa706d3b113 — I want to see if it looks bot-like or has sketchy transaction patterns over the last 15 days?

## When to prefer this

Choose this endpoint when you specifically need to evaluate a wallet's recent behavioral patterns — transaction velocity, counterparty concentration (HHI), and bot-like activity — over a 15-day rolling window, and you want a signed certificate as proof. Prefer this over general wallet footprint or portfolio graders when the concern is behavioral risk (bots, wash trading, velocity abuse) rather than asset quality or wallet age/longevity.

## Known failure modes

- Invalid or malformed wallet address (not 0x-prefixed or not 42 chars) — returns validation error
- Wallet address has no on-chain activity in the 15-day window — may return insufficient data error or lowest grade
- Payment of $0.05 USDC not received or x402 protocol failure — request rejected before processing
- Upstream chain RPC timeout or data unavailability — returns 503 or partial result
- Rate limiting if many certificates are requested in rapid succession

## How this service works

Grade 15-day wallet activity (counterparties, HHI, velocity, bot-like) A-F before you transact. POST wallet_address; signed certificate. $0.05 USDC.

## Output

A signed certificate containing an A–F activity grade for the wallet's last 15 days of on-chain behavior, with sub-scores covering counterparty diversity (HHI), transaction velocity, bot-likelihood signals, and an overall activity quality assessment. The certificate is cryptographically signed for downstream verification.

## 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-activity-certificate-15-day-wallet-behavior-grader-90247e3d/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)