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fix(relayer): match wallet-webapp FeeOptions request shape #966

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fix(relayer): match wallet-webapp FeeOptions request shape #966

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2e0d110
fix(relayer): wrap feeOptions calldata for simulation
taylanpince Feb 13, 2026
3eabc06
fix(relayer): request FeeOptions as wallet (match wallet-webapp-v3)
taylanpince Feb 13, 2026
f8edbf9
fix(relayer): restore AbiFunction import
taylanpince Feb 13, 2026
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14 changes: 10 additions & 4 deletions packages/services/relayer/src/relayer/rpc-relayer/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ import {
TransactionPrecondition,
ETHTxnStatus,
} from './relayer.gen.js'
import { Address, Hex, Bytes, AbiFunction } from 'ox'
import { Address, Hex, AbiFunction } from 'ox'
import { Constants, Payload, Network } from '@0xsequence/wallet-primitives'
import { FeeOption, FeeQuote, OperationStatus, Relayer } from '../index.js'
import { decodePrecondition } from '../../preconditions/index.js'
Expand Down Expand Up @@ -137,15 +137,21 @@ export class RpcRelayer implements Relayer {
to: Address.Address,
calls: Payload.Call[],
): Promise<{ options: FeeOption[]; quote?: FeeQuote }> {
// IMPORTANT:
// The relayer FeeOptions endpoint simulates `eth_call(to, data)`.
// wallet-webapp-v3 requests FeeOptions with `to = wallet` and `data = Payload.encode(calls, self=wallet)`.
// This works for undeployed wallets and avoids guest-module simulation pitfalls.
const callsStruct: Payload.Calls = { type: 'call', space: 0n, nonce: 0n, calls: calls }
const data = Payload.encode(callsStruct)

const feeOptionsTo = wallet
const data = Payload.encode(callsStruct, wallet)

try {
const result = await this.client.feeOptions(
{
wallet,
to,
data: Bytes.toHex(data),
to: feeOptionsTo,
data: Hex.fromBytes(data),
},
{ ...(this.projectAccessKey ? { 'X-Access-Key': this.projectAccessKey } : undefined) },
)
Expand Down