> For the complete documentation index, see [llms.txt](https://andrewkimjoseph.gitbook.io/celina-sdk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://andrewkimjoseph.gitbook.io/celina-sdk/services/transactionservice.md).

# TransactionService

[**@andrewkimjoseph/celina-sdk**](/celina-sdk/api-reference/api-reference.md)

***

[@andrewkimjoseph/celina-sdk](/celina-sdk/api-reference/api-reference.md) / [services/transaction.service](https://github.com/andrewkimjoseph/celina-sdk/blob/main/docs/api-reference/services/transaction.service/README.md) / TransactionService

## Class: TransactionService

Defined in: [src/services/transaction.service.ts:44](https://github.com/andrewkimjoseph/celina-sdk/blob/970ab720c805303ead8b20406c6579ecdcf2193a/src/services/transaction.service.ts#L44)

Token sends, gas fee reads, and `prepareSend` flows with CELINA calldata tags.

### Constructors

#### Constructor

> **new TransactionService**(`clientFactory`): `TransactionService`

Defined in: [src/services/transaction.service.ts:47](https://github.com/andrewkimjoseph/celina-sdk/blob/970ab720c805303ead8b20406c6579ecdcf2193a/src/services/transaction.service.ts#L47)

**Parameters**

**clientFactory**

`CeloClientFactory`

**Returns**

`TransactionService`

### Methods

#### estimateSend()

> **estimateSend**(`from`, `to`, `token`, `amount`): `Promise`<[`SendEstimateResult`](https://github.com/andrewkimjoseph/celina-sdk/blob/main/docs/api-reference/services/transaction.service/type-aliases/SendEstimateResult.md)>

Defined in: [src/services/transaction.service.ts:59](https://github.com/andrewkimjoseph/celina-sdk/blob/970ab720c805303ead8b20406c6579ecdcf2193a/src/services/transaction.service.ts#L59)

Simulate gas for a CELO or ERC-20 transfer from `from`.

**Parameters**

**from**

`` `0x${string}` ``

Sender wallet address

**to**

`` `0x${string}` ``

Recipient address

**token**

`string`

Symbol (e.g. `CELO`, `USDm`) or contract address

**amount**

`string`

Human-readable amount (e.g. `"10"`)

**Returns**

`Promise`<[`SendEstimateResult`](https://github.com/andrewkimjoseph/celina-sdk/blob/main/docs/api-reference/services/transaction.service/type-aliases/SendEstimateResult.md)>

Gas estimate in units as a decimal string, or a structured insufficient-balance result when simulation reverts.

***

#### estimateTransaction()

> **estimateTransaction**(`params`): `Promise`<{ `estimatedCost`: `string`; `estimatedCostFormatted`: `string`; `from`: `` `0x${string}` ``; `gasLimit`: `string`; `gasPrice`: `string`; `isEip1559`: `boolean`; `maxFeePerGas`: `string`; `maxPriorityFeePerGas`: `string`; `network`: `"mainnet"`; `to`: `` `0x${string}` ``; }>

Defined in: [src/services/transaction.service.ts:217](https://github.com/andrewkimjoseph/celina-sdk/blob/970ab720c805303ead8b20406c6579ecdcf2193a/src/services/transaction.service.ts#L217)

Generic transaction gas estimate (not token-transfer specific).

**Parameters**

**params**

**data?**

`` `0x${string}` ``

**from**

`` `0x${string}` ``

**to**

`` `0x${string}` ``

**value?**

`string`

**Returns**

`Promise`<{ `estimatedCost`: `string`; `estimatedCostFormatted`: `string`; `from`: `` `0x${string}` ``; `gasLimit`: `string`; `gasPrice`: `string`; `isEip1559`: `boolean`; `maxFeePerGas`: `string`; `maxPriorityFeePerGas`: `string`; `network`: `"mainnet"`; `to`: `` `0x${string}` ``; }>

***

#### getGasFeeData()

> **getGasFeeData**(): `Promise`<{ `baseFeePerGas`: `string`; `eip1559`: `boolean`; `gasPrice`: `string`; `maxFeePerGas`: `string`; `maxPriorityFeePerGas`: `string`; `network`: `"mainnet"`; }>

Defined in: [src/services/transaction.service.ts:183](https://github.com/andrewkimjoseph/celina-sdk/blob/970ab720c805303ead8b20406c6579ecdcf2193a/src/services/transaction.service.ts#L183)

Current gas fee data including EIP-1559 fees when supported.

**Returns**

`Promise`<{ `baseFeePerGas`: `string`; `eip1559`: `boolean`; `gasPrice`: `string`; `maxFeePerGas`: `string`; `maxPriorityFeePerGas`: `string`; `network`: `"mainnet"`; }>

***

#### prepareSend()

> **prepareSend**(`from`, `to`, `token`, `amount`): `Promise`<[`SerializedPreparedFlow`](/celina-sdk/types/serializedpreparedflow.md)>

Defined in: [src/services/transaction.service.ts:121](https://github.com/andrewkimjoseph/celina-sdk/blob/970ab720c805303ead8b20406c6579ecdcf2193a/src/services/transaction.service.ts#L121)

Build an unsigned send flow (native CELO or ERC-20 transfer).

**Parameters**

**from**

`` `0x${string}` ``

Sender wallet address (must match connected wallet when signing)

**to**

`` `0x${string}` ``

Recipient address

**token**

`string`

Symbol or contract address

**amount**

`string`

Human-readable amount

**Returns**

`Promise`<[`SerializedPreparedFlow`](/celina-sdk/types/serializedpreparedflow.md)>

Single-step `SerializedPreparedFlow` for wagmi `sendTransactionAsync`


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