# Tollkit Chain Token Attestation Lookup

> Tollkit Chain Token Attestation Lookup is a paid API for AI agents from attest.tollkit.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).

Fetches on-chain token data (attestation info) for a given ERC-20 or SPL token contract address on Base, Ethereum, or Solana, paid per-call via x402 USDC micropayment.

## Facts

- Endpoint: POST https://attest.tollkit.dev/chain/token?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tollkit-chain-token-attestation-lookup-9502ffe3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hwiGU9HWl37fVttDv5o9Q

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-chain-token-attestation-lookup-9502ffe3 -d '<json body>'
```

Example prompt: Look up the on-chain attestation data for the Base ERC-20 token at address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 — pay per call, no API key needed.

## When to prefer this

Choose this endpoint when you need on-chain token attestation or metadata for a specific ERC-20 or SPL mint address on Base, Ethereum, or Solana, and you want frictionless per-call access without setting up an account or API key — ideal for agents that pay in-band via x402 USDC micropayments.

## Known failure modes

- Invalid or malformed contract address returns a validation error
- Token address not found on specified chain returns empty or not-found response
- Insufficient USDC payment via x402 causes payment rejection before data is returned
- Wrong chain specified for a given address type (e.g. Solana address with Base chain) returns an error
- Network or RPC unavailability may cause timeout or 5xx errors

## 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 attestation and metadata for the specified token contract, including details about the token's on-chain state and any attestation records associated with that contract address on the requested chain (Base, Ethereum, or Solana).

## 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 on Solana."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tollkit-chain-token-attestation-lookup-9502ffe3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from attest.tollkit.dev](https://www.zero.xyz/host/attest.tollkit.dev/llms.txt)