# @integraledger/lcp/casper > The exports of @integraledger/lcp/casper. Source: https://lcp.integraledger.com/reference/api/casper ## Interfaces ### CasperCall One executed contract call, as the reader reports it. #### Properties | Property | Type | | -------------- | -------------------------------- | | `args` | `object` | | `args.from?` | `string` | | `args.nonce?` | `Uint8Array`\<`ArrayBufferLike`> | | `args.to?` | `string` | | `args.value?` | `bigint` | | `blockHeight` | `bigint` \| `null` | | `entryPoint` | `string` \| `null` | | `error` | `string` \| `null` | | `executed` | `boolean` | | `packageHash` | `string` \| `null` | *** ### CasperChoice #### Properties | Property | Type | | ----------- | ---------------------------------------------------------------- | | `accepted` | [`PaymentRequirements`](https://lcp.integraledger.com/reference/api/x402#paymentrequirements) | | `from` | `string` | | `now` | `number` | | `required` | [`PaymentRequired`](https://lcp.integraledger.com/reference/api/x402#paymentrequired) | *** ### CasperReader Bounded, read-only calls against one network's node. Every failure rejects with `ReaderError`. #### Properties | Property | Modifier | Type | | ---------- | ---------- | ------------------------ | | `network` | `readonly` | `` `casper:${string}` `` | #### Methods ##### transaction() > **transaction**(`hash`): `Promise`\<[`CasperCall`](#caspercall) | `null`> `info_get_transaction`, as a `Version1` transaction and then as a `Deploy`; null when the node knows neither. ###### Parameters | Parameter | Type | | --------- | -------- | | `hash` | `string` | ###### Returns `Promise`\<[`CasperCall`](#caspercall) | `null`> *** ### CasperRef The read keys recorded at claim. #### Properties | Property | Type | | --------------- | ------------------------ | | `asset` | `string` | | `idDigest` | `` `0x${string}` `` | | `network` | `` `casper:${string}` `` | | `settleBy` | `number` | | `transaction?` | `string` | *** ### CasperUnsigned #### Properties | Property | Type | | ------------------- | --------------------------------------- | | `request` | `object` | | `request.kind` | `"casper-eip712"` | | `request.typedData` | [`Cep3009TypedData`](#cep3009typeddata) | #### Methods ##### complete() > **complete**(`publicKey`, `signature`): [`Refusal`](https://lcp.integraledger.com/reference/api#refusal) | [`CasperPaymentPayload`](#casperpaymentpayload) Both arguments are hex with a one-byte algorithm tag: `01` ed25519, `02` secp256k1. ###### Parameters | Parameter | Type | | ----------- | -------- | | `publicKey` | `string` | | `signature` | `string` | ###### Returns [`Refusal`](https://lcp.integraledger.com/reference/api#refusal) | [`CasperPaymentPayload`](#casperpaymentpayload) *** ### Cep3009TypedData #### Properties | Property | Type | Description | | --------------------------------- | -------------------------------------- | ------------------------- | | `domain` | `object` | - | | `domain.chain_name` | `` `casper:${string}` `` | - | | `domain.contract_package_hash` | `string` | - | | `domain.name` | `string` | - | | `domain.version` | `string` | - | | `message` | `object` | - | | `message.from` | `string` | - | | `message.nonce` | `string` | 64 hex digits, no prefix. | | `message.to` | `string` | - | | `message.validAfter` | `bigint` | - | | `message.validBefore` | `bigint` | - | | `message.value` | `bigint` | - | | `primaryType` | `"TransferWithAuthorization"` | - | | `types` | `object` | - | | `types.EIP712Domain` | [`Field`](https://lcp.integraledger.com/reference/api/evm#field)\[] | - | | `types.TransferWithAuthorization` | [`Field`](https://lcp.integraledger.com/reference/api/evm#field)\[] | - | ## Type Aliases ### CasperAddress > **CasperAddress** = `string` 66 hex digits, no prefix: tag `00` (account hash) or `01` (package hash), then 32 bytes. *** ### CasperAuthorization > **CasperAuthorization** = `object` #### Properties | Property | Type | | -------------- | -------- | | `from` | `string` | | `nonce` | `string` | | `to` | `string` | | `validAfter` | `string` | | `validBefore` | `string` | | `value` | `string` | *** ### CasperNetwork > **CasperNetwork** = `` `casper:${string}` `` CAIP-2: `casper:` and the chainspec name. *** ### CasperPaymentPayload > **CasperPaymentPayload** = `object` #### Properties | Property | Type | | ----------------------- | ------------------------------------------------------------------------- | | `accepted` | [`PaymentRequirements`](https://lcp.integraledger.com/reference/api/x402#paymentrequirements) | | `extensions?` | [`PaymentRequired`](https://lcp.integraledger.com/reference/api/x402#paymentrequired)\[`"extensions"`] | | `payload` | `object` | | `payload.authorization` | [`CasperAuthorization`](#casperauthorization) | | `payload.publicKey` | `string` | | `payload.signature` | `string` | | `resource?` | [`PaymentRequired`](https://lcp.integraledger.com/reference/api/x402#paymentrequired)\[`"resource"`] | | `x402Version` | `2` | *** ### CasperStatus > **CasperStatus** = \{ `blockHeight`: `bigint`; `finality`: `"finalized"`; `state`: `"settled"`; } | \{ `state`: `"pending"`; `why`: `"not-found"` | `"not-executed"` | `"unreadable"`; } | \{ `state`: `"failed"`; `why`: `"reverted"` | `"not-this-instrument"`; } *** ### PackageHash > **PackageHash** = `string` 64 hex digits, no prefix. ## Variables ### CASPER\_DOMAIN\_TYPEHASH > `const` **CASPER\_DOMAIN\_TYPEHASH**: `"0xe20dd13933eeb9d6099b53d5ffd59cfd50fe774983038681a378371664fad4fb"` keccak256("EIP712Domain(string name,string version,string chain\_name,bytes32 contract\_package\_hash)") *** ### exactCasper > `const` **exactCasper**: `Readonly`\<\{ `advertise`: [`X402Advertise`](https://lcp.integraledger.com/reference/api/x402#x402advertise); `bound`: (`presented`) => `Promise`\<`` `0x${string}` `` | [`Refusal`](https://lcp.integraledger.com/reference/api#refusal)>; `build`: (`c`, `h`) => `Promise`\<[`Refusal`](https://lcp.integraledger.com/reference/api#refusal) | [`CasperUnsigned`](#casperunsigned)>; `claims`: `boolean`; `id`: `"x402/exact/casper"`; `pattern`: [`LcpPattern`](https://lcp.integraledger.com/reference/api/x402#lcppattern); `read`: (`doc`) => [`Refusal`](https://lcp.integraledger.com/reference/api#refusal) | [`X402Read`](https://lcp.integraledger.com/reference/api/x402#x402read); `recover`: (`ref`, `reader`) => `Promise`\<`` `0x${string}` `` | [`Refusal`](https://lcp.integraledger.com/reference/api#refusal)>; `reference`: (`presented`) => `Promise`\<[`Refusal`](https://lcp.integraledger.com/reference/api#refusal) | [`CasperRef`](#casperref)>; `status`: (`ref`, `reader`) => `Promise`\<[`CasperStatus`](#casperstatus)>; `tie`: (`accepts`, `request`) => \[`"x402"`, \{ `accepts`: readonly [`PaymentRequirements`](https://lcp.integraledger.com/reference/api/x402#paymentrequirements)\[]; `request`: [`RequestCommitment`](https://lcp.integraledger.com/reference/api/x402#requestcommitment); }]; `unplaced`: (`option`) => [`PaymentRequirements`](https://lcp.integraledger.com/reference/api/x402#paymentrequirements); }> ## Functions ### casperIdDigest() > **casperIdDigest**(`from`, `to`, `value`): `Promise`\<`` `0x${string}` `` | [`Refusal`](https://lcp.integraledger.com/reference/api#refusal)> SHA-256 over the 33 + 33 bytes of the two addresses and the value as a 32-byte big-endian integer. #### Parameters | Parameter | Type | | --------- | -------- | | `from` | `string` | | `to` | `string` | | `value` | `bigint` | #### Returns `Promise`\<`` `0x${string}` `` | [`Refusal`](https://lcp.integraledger.com/reference/api#refusal)> *** ### casperOption() > **casperOption**(`o`): `o is PaymentRequirements` The pairing's filter: an `exact` option on a `casper:` network that `build` can turn into typed data. #### Parameters | Parameter | Type | | --------- | --------- | | `o` | `unknown` | #### Returns `o is PaymentRequirements` *** ### casperRecover() > **casperRecover**(`ref`, `reader`): `Promise`\<`` `0x${string}` `` | [`Refusal`](https://lcp.integraledger.com/reference/api#refusal)> The hash from a settlement transaction alone: the `nonce` argument of the executed authorization call on `asset`. #### Parameters | Parameter | Type | | ----------------- | ------------------------------------------------------------------------------------- | | `ref` | \{ `asset`: `string`; `network`: `` `casper:${string}` ``; `transaction`: `string`; } | | `ref.asset` | `string` | | `ref.network` | `` `casper:${string}` `` | | `ref.transaction` | `string` | | `reader` | [`CasperReader`](#casperreader) | #### Returns `Promise`\<`` `0x${string}` `` | [`Refusal`](https://lcp.integraledger.com/reference/api#refusal)> *** ### casperStatus() > **casperStatus**(`ref`, `reader`): `Promise`\<[`CasperStatus`](#casperstatus)> Reads the named transaction. Settled, at the height of its block, when it executed without error as a call to `ref.asset`'s `transfer_with_authorization` or `receive_with_authorization` whose `nonce` argument is `h` and whose `from`, `to` and `value` hash to `ref.idDigest`. A failed read, or a reader for another network, is pending. #### Parameters | Parameter | Type | | --------- | ------------------------------------ | | `ref` | [`CasperRef`](#casperref) & `object` | | `reader` | [`CasperReader`](#casperreader) | #### Returns `Promise`\<[`CasperStatus`](#casperstatus)> *** ### cep3009TypedData() > **cep3009TypedData**(`a`): [`Refusal`](https://lcp.integraledger.com/reference/api#refusal) | [`Cep3009TypedData`](#cep3009typeddata) The CEP-3009 typed data for `TransferWithAuthorization`, with `validAfter` 0 and the hash as the nonce. #### Parameters | Parameter | Type | | --------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `a` | \{ `asset`: `string`; `from`: `string`; `name`: `string`; `network`: `` `casper:${string}` ``; `nonce`: `` `0x${string}` ``; `to`: `string`; `validBefore`: `bigint`; `value`: `string`; `version`: `string`; } | | `a.asset` | `string` | | `a.from` | `string` | | `a.name` | `string` | | `a.network` | `` `casper:${string}` `` | | `a.nonce` | `` `0x${string}` `` | | `a.to` | `string` | | `a.validBefore` | `bigint` | | `a.value` | `string` | | `a.version` | `string` | #### Returns [`Refusal`](https://lcp.integraledger.com/reference/api#refusal) | [`Cep3009TypedData`](#cep3009typeddata)