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x402helper.xyz Swap Price Quote
x402
x402helper.xyz Swap Price Quote is a paid API for AI agents from x402helper.xyz, paid per call via x402, $0.013/call, status unknown (last checked 2026-11-07).
Returns a price quote for swapping one ERC-20 token for another on Base via a micropayment-gated endpoint costing $0.013 USDC per call.
Price / call$0.013
Success—
StatusUnknown
How this service works
X402 micropayments server — AI agents pay USDC for OFAC screening, rates, and billing verification.
Output
A JSON object with a success flag and a result object containing the swap price quote, including the expected output token amount for the given input amount and token pair on Base network.
Example use cases
Pre-trade price check for DeFi swap
“Before I swap, can you check how much USDC I'd get for selling 0.5 WETH on Base right now? Use 50 basis points max slippage.”
Arbitrage rate comparison across tokens
“What's the current exchange rate if I swap 1000000 USDC (in raw units) for AERO on Base with default slippage?”
Best price estimate before large token trade
“I'm about to sell 5 WETH for USDC on Base — can you get me a price quote first with 100 basis points slippage tolerance so I know what to expect?”
Technical details
Endpoint
GEThttps://x402helper.xyz/89e509/swap/price?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a real-time swap price quote for ERC-20 token pairs on Base network and are operating in an x402 micropayment-enabled agent environment. Prefer this over manual DEX aggregator queries when your agent already handles USDC micropayments via x402 protocol and needs a simple GET-based quote with OFAC compliance built in.
Side effects
- Invalid or unsupported tokenIn/tokenOut symbol or address returns an error
- amountIn not provided as a raw integer string causes parsing failure
- Slippage exceeds 5000 bps (50%) triggers validation error
- OFAC screening failure blocks the request
- Payment of 0.013 USDC not included or rejected causes 402 Payment Required response
- Network or liquidity issues may return empty or zero quotes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {},
"success": true
}
}Tags
x402
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