# B20 New Tokens on Base

> B20 New Tokens on Base is a paid API for AI agents from agent402.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Scans recent Base blockchain blocks for newly deployed B20 tokens, enriching each with live name, symbol, and decimals data via eth_calls.

## Facts

- Endpoint: GET https://agent402.tools/api/b20-new-tokens
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/b20-new-tokens-on-base-fabe6170
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1TovwQlcfB2YCIe4QuICQ

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-new-tokens-on-base-fabe6170
```

Example prompt: Can you show me the 25 most recently deployed B20 tokens on Base, looking back across the last 50000 blocks, with their names, symbols, and decimals?

## When to prefer this

Use this endpoint when you need to discover recently launched B20-standard tokens on Base with live on-chain metadata. Prefer it over generic token scanners when you specifically need the 0xB200 address prefix filter, B20Created factory log scanning, and simultaneous name/symbol/decimals enrichment in a single call.

## Known failure modes

- blocks parameter exceeds max of 200000 — returns error
- limit parameter exceeds max of 100 — returns error
- No new B20 tokens found in the specified block window — returns empty list
- RPC or eth_call failure for enrichment — partial or degraded token metadata
- Payment of $0.005 USDC not fulfilled — 402 Payment Required response

## How this service works

Recently deployed B20 tokens on Base: scans the factory's B20Created logs over a block window, locates each new token by its 0xB200 address prefix, and enriches it with live name/symbol/decimals eth_calls. ?blocks=50000&limit=25

## Output

A list of up to 100 newly deployed B20 tokens on Base, ordered newest-first, each enriched with its contract address (0xB200-prefixed), token name, symbol, and decimals as retrieved via live eth_calls.

## 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",
     "properties": {
      "limit": {
       "type": "number",
       "description": "max tokens returned, newest first (default 25, max 100)"
      },
      "blocks": {
       "type": "number",
       "description": "lookback window in blocks (default 50000 ≈ 28h, max 200000)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "network",
      "factory",
      "fromBlock",
      "toBlock",
      "scannedFromBlock",
      "truncated",
      "count",
      "skipped",
      "tokens"
     ],
     "properties": {
      "count": {
       "type": "integer"
      },
      "tokens": {
       "type": "array"
      },
      "factory": {
       "type": "string"
      },
      "network": {
       "type": "string"
      },
      "skipped": {
       "type": "integer"
      },
      "toBlock": {
       "type": "integer"
      },
      "fromBlock": {
       "type": "integer"
      },
      "truncated": {
       "type": "boolean"
      },
      "scannedFromBlock": {
       "type": "integer"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 0,
  "tokens": [],
  "factory": "0xb20f000000000000000000000000000000000000",
  "network": "base",
  "skipped": 0,
  "toBlock": 2,
  "fromBlock": 1,
  "truncated": false,
  "scannedFromBlock": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/b20-new-tokens-on-base-fabe6170/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)