# Tollkit Extract – Chain Check

> Tollkit Extract – Chain Check is a paid API for AI agents from extract.tollkit.dev, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-11).

Checks the blockchain chain status for a given ERC-20 or SPL token contract, paid per-call in USDC via x402 with no account or API key required.

## Facts

- Endpoint: POST https://extract.tollkit.dev/chain/check?utm_source=zero.xyz
- Price: $0.004/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tollkit-extract-chain-check-382acfa9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WbVfRDU6lSRFWsKAEj8gU

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 tollkit-extract-chain-check-382acfa9 -d '<json body>'
```

Example prompt: Can you check the chain status for the token at contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base?

## When to prefer this

Choose this endpoint when you need a quick, no-account, pay-per-call check on whether a specific ERC-20 or SPL token contract exists and is accessible on a given chain (Base, Ethereum, or Solana). Ideal for agents that need one-off on-chain verification without committing to a subscription or API key, paying fractions of a cent per query via x402 in USDC.

## Known failure modes

- Invalid contract address format returns a validation error
- Token not found on specified chain returns empty or error response
- Unsupported chain value triggers enum validation failure
- Payment not received or insufficient USDC causes x402 payment rejection
- Network timeout or RPC node unavailability causes lookup failure

## How this service works

Pay-per-call product page extraction. No account, no API key: pay in-band with x402 in USDC on Base or Solana.

## Output

Returns on-chain chain data for the given token contract address on the specified blockchain (Base, Ethereum, or Solana), confirming chain-level status and availability of the token.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "chain": {
   "enum": [
    "base",
    "ethereum",
    "solana"
   ],
   "type": "string",
   "default": "base",
   "description": "Which chain to read: \"base\" (default), \"ethereum\" or \"solana\"."
  },
  "token": {
   "type": "string",
   "pattern": "^(0x[0-9a-fA-F]{40}|[1-9A-HJ-NP-Za-km-z]{32,44})$",
   "description": "ERC-20 contract or SPL mint."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tollkit-extract-chain-check-382acfa9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from extract.tollkit.dev](https://www.zero.xyz/host/extract.tollkit.dev/llms.txt)