> ## Documentation Index > Fetch the complete documentation index at: https://docs.route.fun/llms.txt > Use this file to discover all available pages before exploring further. # Prepare a builder registry wallet transaction > Requires swap scope and shares its quota. Simulates registration, payout/default-fee changes, ownership transfers or Route-admin policy changes as the supplied wallet. Returns unsigned transaction data. An API key grants no on-chain ownership or admin rights; the correct wallet must review and sign. No server submission or automatic retry. Prepare an unsigned update, then ask the authorized wallet to sign the returned transaction. Your API key cannot change registry settings by itself. | Operation | Use | Signing wallet | | ----------------- | ------------------------------------------------------ | ------------------- | | `register` | Register your generated builder ID and payout settings | Initial owner | | `configure` | Change payout wallet or default builder fee | Current owner | | `proposeOwner` | Start an ownership transfer | Current owner | | `acceptOwnership` | Complete an ownership transfer | Proposed owner | | `policy` | Set fee caps, Route fee overrides or enabled status | Route administrator | For `configure`, send: ```json theme={null} { "code": "YOUR_BUILDER_ID", "operation": "configure", "wallet": "0xYOUR_OWNER_ADDRESS", "args": { "recipient": "0xYOUR_PAYOUT_ADDRESS", "defaultFeeBps": 25 } } ``` Replace the address placeholders with valid EVM addresses. `25` bps is 0.25%; the maximum builder fee is 50 bps, subject to the registered cap. Wait for confirmation before relying on updated settings. [Authentication](/api-reference/authentication) ยท [Builder integration](/builders) ## OpenAPI ````yaml openapi.json POST /api/v2/builders/transaction openapi: 3.1.0 info: title: route version: 2.15.0 description: >- Route compares swap paths offchain and executes swaps on Robinhood Chain. The API returns quotes and unsigned transactions. It does not sign or submit for you. V2 deducts a disclosed pair-dependent output fee up to 0.50%; pool fees, provider charges and gas may still apply. Contracts are experimental and unaudited. Public routing and data endpoints require no API key. Use the documented /api/v2 endpoints for integrations. Builder endpoints require a scoped x-api-key from build.route.fun. Public quote, swap and data endpoints remain keyless. servers: - url: https://api.route.fun security: [] paths: /api/v2/builders/transaction: post: tags: - Builder API summary: Prepare a builder registry wallet transaction description: >- Requires swap scope and shares its quota. Simulates registration, payout/default-fee changes, ownership transfers or Route-admin policy changes as the supplied wallet. Returns unsigned transaction data. An API key grants no on-chain ownership or admin rights; the correct wallet must review and sign. No server submission or automatic retry. operationId: prepareBuilderTransaction requestBody: required: true content: application/json: schema: oneOf: - type: object properties: code: type: string pattern: ^[A-Za-z0-9_-]{3,32}$ operation: type: string const: register wallet: type: string pattern: ^0x[0-9a-fA-F]{40}$ args: type: object properties: recipient: type: string pattern: ^0x[0-9a-fA-F]{40}$ defaultFeeBps: type: integer minimum: 0 maximum: 50 required: - recipient - defaultFeeBps additionalProperties: false required: - code - operation - wallet - args additionalProperties: false - type: object properties: code: type: string pattern: ^[A-Za-z0-9_-]{3,32}$ operation: type: string const: configure wallet: type: string pattern: ^0x[0-9a-fA-F]{40}$ args: type: object properties: recipient: type: string pattern: ^0x[0-9a-fA-F]{40}$ defaultFeeBps: type: integer minimum: 0 maximum: 50 required: - recipient - defaultFeeBps additionalProperties: false required: - code - operation - wallet - args additionalProperties: false - type: object properties: code: type: string pattern: ^[A-Za-z0-9_-]{3,32}$ operation: type: string const: policy wallet: type: string pattern: ^0x[0-9a-fA-F]{40}$ args: type: object properties: maxFeeBps: type: integer minimum: 0 maximum: 50 routeFeeBps: anyOf: - type: integer minimum: 0 maximum: 50 - type: 'null' default: null enabled: type: boolean required: - maxFeeBps - enabled additionalProperties: false required: - code - operation - wallet - args additionalProperties: false - type: object properties: code: type: string pattern: ^[A-Za-z0-9_-]{3,32}$ operation: type: string const: proposeOwner wallet: type: string pattern: ^0x[0-9a-fA-F]{40}$ args: type: object properties: owner: type: string pattern: ^0x[0-9a-fA-F]{40}$ required: - owner additionalProperties: false required: - code - operation - wallet - args additionalProperties: false - type: object properties: code: type: string pattern: ^[A-Za-z0-9_-]{3,32}$ operation: type: string const: acceptOwnership wallet: type: string pattern: ^0x[0-9a-fA-F]{40}$ args: type: object properties: {} required: [] additionalProperties: false required: - code - operation - wallet additionalProperties: false responses: '200': description: Verified registry or finalized history result content: application/json: schema: type: object properties: transaction: type: object properties: to: type: string pattern: ^0x[0-9a-fA-F]{40}$ from: type: string pattern: ^0x[0-9a-fA-F]{40}$ data: type: string value: const: '0' type: string chainId: type: integer const: 4663 required: - to - from - data - value - chainId additionalProperties: false code: type: string pattern: ^[A-Za-z0-9_-]{3,32}$ action: type: string enum: - register - configure - policy - proposeOwner - acceptOwnership simulation: type: object properties: blockNumber: type: string pattern: ^[0-9]+$ blockHash: type: string pattern: ^0x[0-9a-fA-F]{64}$ required: - blockNumber - blockHash additionalProperties: false review: type: string required: - transaction - code - action - simulation - review additionalProperties: false '400': description: Malformed input, invalid code/cursor or fee above cap '401': description: Missing or invalid API key '403': description: Missing required API key scope '404': description: Builder not registered (lookup) '409': description: Registry operation rejected or history snapshot changed '429': description: Caller workspace or global rate limit '503': description: >- Registry/collector not commissioned, RPC unavailable, or verification/capacity failure security: - BuilderKey: [] components: securitySchemes: BuilderKey: type: apiKey in: header name: x-api-key description: >- Server-side key created in an authenticated developer workspace. Builder codes are public attribution, not credentials. ````