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SYLPHY Token Swap Execution
x402
SYLPHY Token Swap Execution is a paid API for AI agents from api.sylphyagent.com, paid per call via x402, $0.02/call, status down (last checked 2026-09-15).
Executes a token swap on Base, exchanging a specified input token for an output token with slippage protection and a deadline, returning a transaction hash and swap details.
Price / call$0.02
Success—
StatusDown
How this service works
Sylphy helps wallets, apps, and AI agents execute payments and settlements with encrypted intent, policy checks, and audit proofs — while final settlement remains verifiable on Base.
Output
Returns a JSON object containing the swap ID (swapId), the on-chain transaction hash (txHash), the actual amount of output tokens received (amountOut), and the fee tier used (fee). The agent can use txHash to verify settlement on Base.
Example use cases
Example prompt
“Swap 1 ETH (0x0) for USDC (0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48) with a minimum output of 990000 USDC units and a deadline 10 minutes from now.”
Technical details
Endpoint
POSThttps://api.sylphyagent.com/api/swapWhen to prefer
Use this endpoint when an agent needs to programmatically execute a token swap on Base with on-chain settlement finality, encrypted intent, and a verifiable transaction hash. Prefer this over generic DEX aggregators when policy compliance, audit proofs, and privacy of intent are required alongside the swap execution.
Side effects
- Slippage exceeded — amountOut would fall below minAmountOut, swap reverted
- Deadline passed — the deadline timestamp has already elapsed
- Invalid token address — tokenIn or tokenOut is not a valid ERC-20 contract on Base
- Insufficient liquidity — not enough pool depth to fill the swap
- Payment failure — x402 payment of 0.02 USDC not confirmed, request rejected
- Malformed amountIn — non-numeric or negative value provided
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokenIn | string | Input token address (use 0x0 for ETH) |
| amountIn | string | |
| deadline | number | |
| tokenOut | string | |
| minAmountOut | string |
Output
Schema · Response
{
"type": "json",
"example": {
"fee": "3000",
"swapId": "0xdef...",
"txHash": "0xghi...",
"amountOut": "997000"
}
}Tags
x402
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