ToolVet
78trust / 100

Base Token Facts

by agentshelf.syntexa.ch in Onchain & crypto

x402 APIPassing, checked 35 min ago

Call when an agent needs ERC-20 metadata, proxy and owner flags, a 30-day recently_deployed heuristic, and an optional holder balance for one Base token. Send token and optional holder. No LLM. Read-only. Send JSON {"token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","holder":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.01 USDC on Base. Try unpaid POST /v1/sandbox/base-token-facts first.

POST
https://agentshelf.syntexa.ch/v1/base-token-facts
Price
$0.01
per call in USDC
Uptime
100%
last 30 days
Response time
33 ms
121 ms slowest 5%
Last check
Passed
35 min ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://agentshelf.syntexa.ch/v1/base-token-facts

Each call costs $0.01 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://agentshelf.syntexa.ch/v1/base-token-facts
content-type: application/json

{
  "holder": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}

Parameters

ParameterTypeRequiredDescription
holderstringNoOptional wallet whose token balance is included. Example: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045. Omit it to skip the balance read. EIP-55 or all one case.
tokenstringYesToken contract on Base mainnet. Example: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Circle USDC). Returns metadata, EIP-1967 proxy flags, owner_renounced, and a 30-day recently_deployed heuristic. No LLM.

Example response

The provider's example. We can't check it without paying.

Example response, 26 lines
{
  "billed": true,
  "bytecode_bytes": 2,
  "bytecode_hash": "0x1111111111111111111111111111111111111111111111111111111111111111",
  "decimals": 6,
  "deploy_block": 10,
  "deploy_timestamp": 1700000000,
  "holder": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "holder_balance": "2.5",
  "holder_balance_raw": "2500000",
  "implementation": null,
  "is_contract": true,
  "name": "USD Coin",
  "network": "eip155:8453",
  "ok": true,
  "owner": null,
  "owner_renounced": null,
  "receipt_id": "rcpt_01EXAMPLE000000000000000",
  "recently_deployed": false,
  "symbol": "USDC",
  "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "total_supply": "1000000",
  "total_supply_raw": "1000000000000",
  "upgradeable_proxy": false,
  "warnings": []
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.01.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agentshelf.syntexa.ch/v1/base-token-facts' \
  -H 'content-type: application/json' \
  --data-raw '{"holder":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://agentshelf.syntexa.ch/v1/base-token-facts' \
  -H 'content-type: application/json' \
  --data-raw '{"holder":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagentshelf.syntexa.ch%2Fv1%2Fbase-token-facts&method=POST
const res = await pay("https://agentshelf.syntexa.ch/v1/base-token-facts", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "holder": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
    "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agentshelf.syntexa.ch/v1/base-token-facts",
        json={
            "holder": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
            "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        },
    )
    print(res.status_code, res.text)

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