> ## Documentation Index > Fetch the complete documentation index at: https://docs.sx.bet/llms.txt > Use this file to discover all available pages before exploring further. # Exchange metadata > Retrieve exchange metadata including contract addresses, supported tokens, and limits This is a sample response. Visit [https://api.sx.bet/metadata/obv3](https://api.sx.bet/metadata/obv3) (or [https://api.toronto.sx.bet/metadata/obv3](https://api.toronto.sx.bet/metadata/obv3)) for up-to-date values. ## OpenAPI ````yaml GET /metadata/obv3 openapi: 3.0.1 info: title: SX Bet API version: 1.0.0 description: >- REST API for the SX Bet decentralized sports betting exchange. Retrieve sports data, markets, and orderbook information. Post, cancel, and fill orders with signed payloads. Base URLs: - **Mainnet**: `https://api.sx.bet` - **Testnet**: `https://api.toronto.sx.bet` servers: - url: https://api.sx.bet description: Mainnet (SX Network, chainId 4162) - url: https://api.toronto.sx.bet description: Testnet (Toronto, chainId 79479957) security: [] tags: - name: Connection description: Server metadata and heartbeat management - name: Sports Data description: Sports, leagues, teams, fixtures, and live scores - name: Markets description: Active, specific, and popular betting markets - name: Trades description: Matched trades and portfolio history - name: Orders description: Orderbook queries, posting, cancelling, and filling orders paths: /metadata/obv3: get: tags: - Connection summary: Get OBv3 metadata description: >- The bootstrap document: exactly five top-level keys, and the first call any client should make. No authentication. **Read every value at runtime — do not copy the examples.** `chainId`, `activeAsset` and the order-size minimum are per-environment, and both networks' values are tabled on [Testnet & Mainnet](/developers/testnet-and-mainnet). **This is also the canonical order-surface availability probe**: 200 means the surface is live, 503 means it is unavailable on that environment, and 404 means the deployment predates it entirely. Neither `GET /orders-v3/odds/best` nor a 401 tells you this. operationId: getMetadataObv3 responses: '200': description: '' content: application/json: schema: type: object properties: status: type: string description: '`success` or `failure` if the request succeeded or not' data: $ref: '#/components/schemas/MetadataObv3' example: status: success data: chainId: 79479957 domain: name: OBv3 Escrow version: '1' chainId: 79479957 verifyingContract: '0x007D30a86366EdA2a410a176329f991565d8CfA4' activeAsset: symbol: USDC baseToken: '0x1BC6326EA6aF2aB8E4b6Bc83418044B1923b2956' escrowAddress: '0x007D30a86366EdA2a410a176329f991565d8CfA4' decimals: 6 oddsLadderStepSize: 125 limits: orderSizeMinimum: '1' orderSizeMinimumBaseUnits: '1000000' minRestingOrderSize: '0.1' minRestingOrderSizeBaseUnits: '100000' maxCreateOrders: 10 maxCancelOrders: 100 '404': description: '' '500': description: '' '503': description: '' content: application/json: schema: $ref: '#/components/schemas/ErrorNest' example: message: Service Unavailable statusCode: 503 security: [] components: schemas: MetadataObv3: description: >- Runtime configuration for the exchange. Read every value at runtime — do not copy the examples. Only `domain.name` and `domain.version` are fixed; `chainId`, `domain.verifyingContract`, `activeAsset`, and the order-size minimum are per-environment. type: object properties: chainId: type: integer description: >- Chain id, used as the EIP-712 domain `chainId`. Differs per environment — see [Environments](/developers/environments). example: 79479957 domain: description: >- Complete EIP-712 domain. Pass this object straight to `signTypedData`. `name` and `version` are fixed; `chainId` and `verifyingContract` are per-environment. type: object properties: name: type: string description: EIP-712 domain name. Always "OBv3 Escrow". example: OBv3 Escrow version: type: string description: EIP-712 domain version. The string "1", not "1.0". example: '1' chainId: type: integer description: EIP-712 domain chain id. Same value as the top-level `chainId`. example: 79479957 verifyingContract: type: string description: >- EIP-712 verifying contract — the Escrow proxy. Same value as `activeAsset.escrowAddress`. example: '0x007D30a86366EdA2a410a176329f991565d8CfA4' activeAsset: description: >- The single active (baseToken, escrowAddress) pair for this environment type: object properties: symbol: type: string example: USDC description: Settlement token symbol. baseToken: type: string description: >- ERC-20 address of the settlement token. Pass this as `baseToken` when creating orders. escrowAddress: type: string description: >- Escrow contract. Equals `domain.verifyingContract` — see [EIP-712 order signing](/api-reference/eip712-order-signing). decimals: type: integer example: 6 description: >- Token decimals — 6 for USDC. Every amount in the API is in base units. oddsLadderStepSize: type: integer description: Odds must be a multiple of this x 1e15. 125 means 0.125%. example: 125 limits: type: object properties: orderSizeMinimum: type: string description: Minimum order size in whole tokens. example: '1' orderSizeMinimumBaseUnits: type: string description: >- The same minimum in base units. Compare `totalBetSize` against this one, not against `orderSizeMinimum`. example: '1000000' minRestingOrderSize: type: string description: >- Minimum resting remainder in whole tokens. A partial fill that leaves less than this amount closes the order as filled (`inactiveReason` `FILLED`). Not the same as `orderSizeMinimum`. example: '0.1' minRestingOrderSizeBaseUnits: type: string description: >- The same minimum resting remainder in base units. A partial fill that leaves less than this amount is discarded and the order closes as filled (`inactiveReason` `FILLED`). Not the same as `orderSizeMinimumBaseUnits`. example: '100000' maxCreateOrders: type: integer example: 10 description: Maximum orders in one `POST /orders-v3`. maxCancelOrders: type: integer example: 100 description: Maximum order ids in one cancel request. description: Batch and size limits for this environment. ErrorNest: description: Most common shape. type: object properties: message: type: string example: INVALID_USER error: type: string example: Unauthorized statusCode: type: integer example: 401 ````