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Base Toolbox Send Check
x402
Base Toolbox Send Check is a paid API for AI agents from basetoolbox.cartonpliant.workers.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-15).
Pre-flight validation check for token transfers on Base before signing, verifying safety and readiness of ERC-20 or native sends
Price / call$0.1
Success—
StatusUnknown
How this service works
Base toolbox: before you sign on Base — Uniswap v3 preflight, leftover allowances, tx explain, transfer check. $0.10 USDC. Also $0.001 price/gas/ENS. GET /v1/constants free. No CoinGecko key.
Output
Returns a JSON object indicating whether the transfer is valid (ok: true/false), the kind of transfer detected (e.g. 'erc20' or native), and a recommended next action (e.g. 'confirm_send'). May include warnings about insufficient balance, allowance issues, or other pre-flight problems.
Example use cases
Validate ERC-20 transfer before signing
“I want to send 200 USDC on Base to 0xDeF...456 from my wallet 0xAbC...123 — can you run a send check to confirm it's safe and tell me if there are any issues before I sign?”
Pre-screen ETH send for wallet agent
“My agent is about to send 0.05 ETH on Base to 0x789...ABC — do a preflight check to make sure the transaction won't fail and let me know what the next step should be.”
Check allowance before DeFi token transfer
“I'm trying to move some tokens on Base and I want to verify the send is safe first — check my transfer from 0xAAA...111 to 0xBBB...222 for any leftover allowance issues or balance problems.”
Technical details
Endpoint
POSThttps://basetoolbox.cartonpliant.workers.dev/v1/send-checkWhen to prefer
Use this endpoint when an AI agent or user wants to validate a token transfer on Base before signing or broadcasting — especially useful for ERC-20 sends where allowance and balance pre-checks prevent failed transactions. Prefer over generic blockchain RPC calls when you want a human-readable next-action recommendation alongside the safety check.
Side effects
- Invalid or missing wallet addresses returns validation error
- Insufficient balance or allowance detected returns ok: false with reason
- Unsupported token type returns error or unknown kind
- Network connectivity issues to Base RPC return service error
- Malformed input object returns 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| input | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"kind": "erc20",
"next": "confirm_send"
}
}Tags
x402
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