# B20 Token Announcement Feed Reader

> B20 Token Announcement Feed Reader is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Fetches the on-chain announcement feed (active and ended) for a B20 Asset token, returning issuer notices, corporate actions, and redemption communications indexed from CDP events.

## Facts

- Endpoint: GET https://402.com.tr/api/x402/b20-announcements
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/b20-token-announcement-feed-reader-66defa94
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2iYp5AIYadzX6IBXl_kmN

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-token-announcement-feed-reader-66defa94
```

Example prompt: Pull the announcement feed for B20 token at address 0xAbC123... on Base — show me any active issuer notices, corporate actions, or redemption announcements.

## When to prefer this

Use this endpoint when an AI agent holds or monitors B20 tokenized/RWA assets and needs to read issuer communications, corporate action notices, or redemption announcements that have no equivalent in standard ERC-20. Prefer this over generic blockchain event scrapers when the token is a B20 asset on Base and you need structured, CDP-indexed announcement data.

## Known failure modes

- Invalid or non-B20 token address returns empty feed or error
- Address not found on Base chain returns no results
- CDP indexing lag may mean very recent announcements are not yet reflected
- Malformed address string causes request validation failure
- Token with no announcements returns empty list

## How this service works

🆕 B20 Asset tokens can post on-chain announcements (Announcement: id, description, uri) — issuer notices, corporate actions, redemptions — a channel ERC-20 has no equivalent for. Reads a token's announcement feed (active vs ended) from CDP-indexed events. The issuer-communications primitive for agents holding tokenized/RWA B20 assets.

## Output

A list of on-chain announcements for the specified B20 token, each containing an announcement id, description, and URI, categorized by status (active vs ended), sourced from CDP-indexed contract events.

## 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"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "B20 Asset token address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/b20-token-announcement-feed-reader-66defa94/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 402.com.tr](https://www.zero.xyz/host/402.com.tr/llms.txt)