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Crypto Swap Quote (Base Chain)
x402
Crypto Swap Quote (Base Chain) is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).
Returns a multi-venue aggregated swap quote for two tokens on Base, including route, price, gas cost, slippage, and an optional ready-to-sign transaction calldata.
Price / call$0.003
Success—
StatusUnknown
How this service works
Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.
Output
Returns a JSON object with both token details (symbol, address, decimals), number of hops, chain, effective price, route array, router address and label, source aggregator, gas cost in USD, L1 fee in USD, minimum output amount, amount out (human units), amount out USD, net out USD, cost percentage, verdict (e.g. GOOD), and human-readable guidance. If a wallet address is provided, also includes ready-to-sign calldata and allowance/balance checks.
Example use cases
Pre-trade sanity check before swapping
“Before I swap 500 USDC into cbBTC on Base, can you get me a quote showing the price, route, gas cost, and whether it's a good fill?”
Ready-to-sign swap transaction for agent execution
“I want to swap 100 USDC to AERO on Base from my wallet 0x1234abcd...5678 — get me the aggregated best-route quote with calldata I can sign, using default 0.5% slippage.”
Compare net output across swap sizes
“What's the net USD value I'd get out if I swap 50 USDC to WETH on Base right now? Show me the route, gas fees, and total cost percentage.”
Technical details
Endpoint
GEThttps://kr-x402-mvp.kgy5612.workers.dev/v1/crypto/swap-quote?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to price or execute a token swap on Base chain without managing API keys, wants multi-venue aggregated quotes (not just a single DEX), needs gas cost estimates in USD, wants a human-readable verdict on fill quality, or needs ready-to-sign calldata for a specific wallet. Prefer over raw DEX APIs when you want aggregated routing, cost analysis, and agent-friendly guidance in one call. Especially suited for pay-per-call agent workflows via x402 USDC micropayments.
Side effects
- Unsupported token symbol or invalid 0x address returns an error or empty route
- No liquidity found for the pair on Base returns an error or null route
- Invalid amount format (non-numeric) causes a validation error
- Missing required parameters (from, to, amount) returns a 400-level error
- Payment not settled via x402 returns a 402 Payment Required response
- Wallet address fails regex validation (not a valid 0x address) returns a schema error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"to": {
"symbol": "WETH",
"address": "0x4200000000000000000000000000000000000006",
"decimals": 18
},
"from": {
"symbol": "USDC",
"address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"decimals": 6
},
"hops": 1,
"chain": "base",
"price": 2224.6,
"route": [
"pmm-2"
],
"router": "0x6131b5fae19ea4f9d964eac0408e4408b66337b5",
"source": "kyberswap",
"gas_usd": 0.0319,
"min_out": 0.00447272,
"verdict": "GOOD",
"cost_pct": -0.73,
"guidance": "Good fill. Pass wallet= for ready-to-sign calldata; verify it with /crypto/decode-calldata before signing.",
"amount_in": 10,
"amount_out": 0.0044952,
"l1_fee_usd": 0.0015,
"net_out_usd": 10.0153,
"router_label": "KyberSwap MetaAggregation Router v2",
"slippage_bps": 50,
"amount_in_usd": 9.976,
"amount_out_usd": 10.0487
}
}Tags
x402
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