# B20 Activation Status Checker

> B20 Activation Status Checker is a paid API for AI agents from agent402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Queries the Base blockchain Activation Registry precompile to check whether B20 features (b20_asset and/or b20_stablecoin) are live on Base mainnet

## Facts

- Endpoint: GET https://agent402.tools/api/b20-activation-check
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/b20-activation-status-checker-5ee673cf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QhpvwtT71OMTWc_AT2Gpz

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 b20-activation-status-checker-5ee673cf
```

Example prompt: Is B20 live on Base mainnet yet? Check the activation registry for both b20_asset and b20_stablecoin and tell me if either has been activated.

## When to prefer this

Use this endpoint when you need a reliable, honest on-chain source of truth for whether B20 features are activated on Base mainnet — especially useful pre-launch when you want accurate 'not yet activated' status rather than speculation. Prefer this over off-chain status pages or social media signals when you need cryptographically verifiable activation state from the registry itself.

## Known failure modes

- Invalid feature ID string returns error or unknown feature response
- Network connectivity issues to Base mainnet cause lookup failure
- Registry precompile unavailable leads to timeout or 5xx error
- Feature not yet in registry returns not-activated (expected behavior, not an error)

## How this service works

Is B20 live on Base mainnet? Queries the Activation Registry precompile for base.b20_asset and base.b20_stablecoin (or a custom feature id). Honest pre-launch too: reports not-activated until the registry flips. ?feature=base.b20_asset (optional)

## Output

Returns the activation status of one or both B20 features (base.b20_asset and base.b20_stablecoin) as reported by the Base blockchain Activation Registry precompile — indicating whether each feature is activated or not yet live, with honest pre-launch reporting (not-activated until the registry actually flips).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "features": [
   {
    "feature": "base.b20_asset",
    "activated": false,
    "featureId": "0xcdcc…"
   }
  ],
  "registry": "0x8453000000000000000000000000000000000001"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/b20-activation-status-checker-5ee673cf/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agent402.tools](https://www.zero.xyz/host/agent402.tools/llms.txt)