# B20 Token Supply Cap & Dilution Risk Checker

> B20 Token Supply Cap & Dilution Risk Checker is a paid API for AI agents from 402.com.tr, paid per call via x402, $0.04/call, status unknown (last checked 2026-09-14).

Reads a B20 token's supply cap versus minted supply and retrieves on-chain SupplyCapUpdated history to assess dilution risk

## Facts

- Endpoint: GET https://402.com.tr/api/x402/b20-supply
- Price: $0.04/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-supply-cap-dilution-risk-checker-33950612
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_L1v2RDqW9q37xbcCozkqX

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-supply-cap-dilution-risk-checker-33950612
```

Example prompt: Can you check the supply cap and dilution risk for this B20 token on Base — address 0xAbC123...? I want to know how much more can be minted, and whether the issuer has ever raised the cap.

## When to prefer this

Use this endpoint when evaluating dilution risk for a B20 token — specifically when you need to know whether an issuer can or has inflated supply by raising the cap or having no cap at all. Pair with b20-control to identify who holds the mint role. Prefer this over generic token info endpoints when the B20 standard's SupplyCapUpdated history is needed for rug risk analysis.

## Known failure modes

- Invalid or non-B20 token address returns an error or empty response
- Token contract does not implement supply cap methods — may return null or unsupported error
- Network/RPC issues on Base chain causing timeout
- Address is a valid ERC-20 but not a B20 token, resulting in missing data fields

## How this service works

🆕 The dilution half of B20 rug risk (b20-safety covers seizure). Reads supply cap vs minted supply (how much can still be minted) plus the on-chain SupplyCapUpdated history — an issuer that RAISED the cap diluted, or set up to dilute, holders. Uncapped mint is flagged as the worst case. Pair with b20-control to see who holds the mint role.

## Output

Returns the token's supply cap, current minted supply, remaining mintable amount, a flag if the token is uncapped (worst-case dilution risk), and a historical log of SupplyCapUpdated on-chain events showing any past cap increases by the issuer.

## 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 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-supply-cap-dilution-risk-checker-33950612/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)