x402-toolbox Chain Token Allowance

x402

x402-toolbox Chain Token Allowance is a paid API for AI agents from x402-toolbox.shablony-pro.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-29).

Looks up the ERC-20 token allowance granted by an owner to a spender on a blockchain, paid per-call via x402 USDC micropayment

Price / call$0.002

Seller volume →—

Success—

StatusUnknown

How this service works

309 deterministic pay-per-call tools for AI agents over x402 (USDC, Base). No signup, no API key: the payment is the identity.

Output

Returns a JSON object indicating success and payment confirmation, along with the numeric token allowance amount that the specified spender is approved to transfer on behalf of the owner for the given ERC-20 token and chain.

Example use cases

DeFi pre-trade allowance check

“Before I swap on the DEX, check whether the router contract has enough token allowance to spend my USDC — tell me the exact approved amount on Base.”

Security audit of wallet approvals

“I want to audit my wallet's ERC-20 approvals — look up what allowance I've granted to that Aave lending contract for USDC on Base.”

Automated bot approval verification

“My trading bot needs to verify that the aggregator contract has a non-zero USDC allowance from the bot's wallet before it tries to execute — can you check the current allowance on-chain?”

Technical details

Endpoint

GEThttps://x402-toolbox.shablony-pro.workers.dev/chain/token-allowance?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a quick, no-signup, pay-per-call lookup of ERC-20 token allowances on Base or supported EVM chains, especially in agent workflows where acquiring API keys is impractical and micropayment via x402/USDC is acceptable. Prefer it over self-hosted RPC calls when you want a managed, deterministic tool invocation without infrastructure overhead.

Side effects

Invalid or malformed schema/address input returns error response
Token contract not found on specified chain returns null or zero allowance
Network/RPC unavailability causes timeout or 5xx error
Payment failure via x402 blocks the request with 402 status
Unsupported chain identifier returns validation error

Input

Schema · Request body

Field	Type	Description
schema	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "paid": true
  }
}

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