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FortiSwap Transaction Builder
x402
FortiSwap Transaction Builder is a paid API for AI agents from app.fortiblox.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Builds an unsigned, simulated X1 blockchain swap transaction (base64 v0) routed through the on-chain FortiBlox Router, with impact capping, slippage control, and 25 bps protocol fee enforced in-program.
Price / call$0.005
Success—
StatusUnknown
How this service works
Build an unsigned, simulated X1 swap transaction (base64 v0) for the given payer through the on-chain FortiBlox Router — routed, impact-capped, simulated before return; the 25 bps protocol fee is enforced in-program. Sign it with the payer key and broadcast via POST /api/tx/send (free). Amounts are raw base units. Requires a prior quote. Optional integrator fee (integratorFeeBps + integratorFeeRecipient; the recipient's output-mint ATA must exist, else 422 INTEGRATOR_FEE_DESTINATION_MISSING).
Output
Returns an unsigned base64-encoded Solana v0 transaction that has been pre-simulated on-chain via the FortiBlox Router. The transaction includes route selection across XDEX and Degen pools, impact capping, and the 25 bps protocol fee enforced in-program. The caller must sign it with the payer key and broadcast via POST /api/tx/send.
Example use cases
Automated DeFi swap bot
“Build an exactIn swap transaction on FortiBlox for my bot — payer is 9xDef1234ABCxyz567, swapping 500000 raw units of mint So11111111111111111111111111111111111111112 to mint EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v, 30 bps slippage, max 3 hops, and use 10000 priority fee lamports.”
Exact-out purchase of specific token amount
“I need to receive exactly 2000000 raw units of mint EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v — build me an exactOut FortiBlox swap transaction with payer 9xDef1234ABCxyz567, input mint So11111111111111111111111111111111111111112, 50 bps slippage, and keep the slot expiry from my last quote.”
High-impact swap with acknowledgment
“Build me a FortiBlox swap transaction for a large trade: exactIn, payer 9xDef1234ABCxyz567, 50000000 raw units of So11111111111111111111111111111111111111112 to EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v, acknowledge high price impact, 100 bps slippage, max 6 hops, and 50000 priority fee lamports.”
Technical details
Endpoint
POSThttps://app.fortiblox.com/api/tx/buildWhen to prefer
Use this endpoint when you need to construct a ready-to-sign X1 blockchain swap transaction routed through the FortiBlox on-chain router with simulation guarantees. It is the required second step after obtaining a quote from /api/quote. Prefer this over generic Solana transaction builders when you specifically need FortiBlox's impact-capping, multi-hop routing across XDEX and Degen pools, and in-program fee enforcement on the X1 network.
Side effects
- Invalid or unfunded payer address — simulation fails if the payer account doesn't exist on X1
- Missing prior quote — validUntilSlot must come from a preceding /api/quote call
- Expired quote slot — transaction build fails if validUntilSlot has passed
- Exceeds maxHops cap — values above 6 are rejected by the on-chain router
- High price impact without acknowledgeHighImpact=true — build rejected to protect user
- Slippage too tight — simulation may fail if market moved beyond slippageBps since quote
- Invalid mint address — non-base58 or unregistered mints cause rejection
- Payment required — $0.005 USDC per call; missing or failed x402 payment returns 402
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| mode | string | default exactIn |
| payer | string | base58 fee payer / signer (must be a funded X1 account — the build is simulated) |
| maxHops | number | 1-6 (on-chain router cap), default 4 |
| amountIn | string | raw base units (exactIn) |
| amountOut | string | raw base units (exactOut) |
| inputMint | string | base58 X1 mint address |
| outputMint | string | base58 X1 mint address |
| slippageBps | number | explicit slippage in bps (clamped); omitted = dynamic |
| validUntilSlot | number | quote expiry slot from /api/quote |
| integratorFeeBps | number | 1-300; optional integrator markup taken in-program by the router into integratorFeeRecipient's ATA — requires integratorFeeRecipient; 0/absent = none |
| keepWrappedOutput | boolean | keep WXNT instead of auto-unwrapping |
| priorityFeeLamports | — | optional total priority-fee budget in lamports, non-negative integer (string or number); clamped to 1000000000 |
| acknowledgeHighImpact | boolean | |
| integratorFeeRecipient | string | base58 integrator wallet (required with integratorFeeBps); its associated token account for outputMint must already exist — the router never creates it (422 INTEGRATOR_FEE_DESTINATION_MISSING names the address) |
| priorityFeeMicroLamports | — | optional per-compute-unit priority fee, non-negative integer (string or number); clamped to 714285714 |
Tags
x402
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