> ## Documentation Index > Fetch the complete documentation index at: https://developers.zerion.io/llms.txt > Use this file to discover all available pages before exploring further. # Get chain by ID > Look up one supported chain by its chain ID, with name, icon, native asset and per-chain feature flags. ## OpenAPI ````yaml /openapi-v1.yaml get /v1/chains/{chain_id} openapi: 3.0.3 info: version: 1.0.0 title: REST API description: REST-like API provides access to rich Zerion ecosystem. contact: name: Zerion API url: https://developers.zerion.io/ email: api@zerion.io servers: - description: Production API url: https://api.zerion.io security: - APIKeyBasicAuth: [] tags: - name: wallets description: >- Operations related to wallets, such as portfolio charts, positions, and transactions. - name: wallet sets description: >- Operations on a wallet set, returning aggregated portfolio data across at most one EVM address and one Solana address queried together. - name: fungibles description: >- Operations related to fungible assets, such as list them all, search or get by ID. - name: chains description: Operations related to chains, such as list all chains. - name: swap description: Operations related to swapping and bridging assets. - name: gas description: Operations related to gas. - name: nfts description: >- Operations related to non fungible assets, such list them, search or get by ID. - name: dapps description: >- Operations related to decentralized applications, such as list them all, search or get by ID. - name: subscriptions to transactions description: Operations related to subscriptions to transactions. paths: /v1/chains/{chain_id}: get: tags: - chains summary: Get chain by ID description: > Returns a single chain by its unique chain ID. Each chain's `flags` report per-capability support: whether trading, sending, bridging, transaction history, positions and NFT positions are available on that chain. **See also:** [Testnets (`X-Env: testnet`)](https://developers.zerion.io/supported-blockchains#testnets) operationId: getChainById parameters: - name: chain_id in: path required: true description: Unique chain ID. schema: type: string - name: X-Env in: header description: Set to `testnet` to return testnet data instead of mainnet. required: false schema: type: string enum: - testnet responses: '200': $ref: '#/components/responses/SingleChainResponse' '400': $ref: '#/components/responses/MalformedParameters' '401': $ref: '#/components/responses/UnauthenticatedError' '404': $ref: '#/components/responses/NotFoundResponse' '429': $ref: '#/components/responses/TooManyRequests' components: responses: SingleChainResponse: description: Response for requested chain content: application/json: schema: $ref: '#/components/schemas/ChainResponse' MalformedParameters: description: Parameters are malformed content: application/json: schema: type: object properties: errors: type: array items: type: object properties: title: type: string description: Error short title example: Parameter is malformed detail: type: string description: Long description of the error example: Some validation errors will be described here UnauthenticatedError: description: Unathenticated request content: application/json: schema: type: object properties: errors: type: array items: type: object properties: title: type: string description: Error short title example: Unauthorized Error detail: type: string description: Long description of the error example: >- The API key is invalid, please, make sure that you are using a valid key NotFoundResponse: description: Resource was not found content: application/json: schema: type: object properties: errors: type: array items: type: object properties: title: type: string description: Error short title example: Resource was not found detail: type: string description: Long description of the error example: Requested resource was not found, try later TooManyRequests: description: Too many requests error content: application/json: schema: type: object properties: errors: type: array items: type: object properties: title: type: string description: Error short title example: Too many requests detail: type: string description: Long description of the error example: Your request had been throttled schemas: ChainResponse: type: object required: - links - data properties: links: $ref: '#/components/schemas/ResponseLinks-16' data: $ref: '#/components/schemas/Container-15' ResponseLinks-16: type: object required: - self properties: self: type: string format: url description: URL of the current chain. example: https://api.zerion.io/v1/chains/polygon Container-15: type: object required: - type - id properties: type: type: string description: Chain resource type example: chains id: type: string description: Chain unique identifier example: polygon attributes: $ref: '#/components/schemas/Attributes-13' relationships: $ref: '#/components/schemas/Relationships-7' Attributes-13: type: object description: Attributes of chain resource required: - name properties: external_id: type: string description: Community used chain ID example: '0x4e454152' name: type: string description: Human readable chain name example: polygon icon: $ref: '#/components/schemas/Icon' explorer: $ref: '#/components/schemas/Explorer' rpc: $ref: '#/components/schemas/RPC' flags: $ref: '#/components/schemas/Flags-5' Relationships-7: type: object required: - native_fungible properties: native_fungible: $ref: '#/components/schemas/ResponseShort' wrapped_native_fungible: $ref: '#/components/schemas/ResponseShort' Icon: type: object description: Icon related to object. properties: url: type: string nullable: true format: url description: URL of the icon. example: >- https://token-icons.s3.amazonaws.com/0x0391d2021f89dc339f60fff84546ea23e337750f.png Explorer: type: object required: - name description: Chain explorer data properties: name: type: string description: Human readable explorer name example: polygonScan token_url_format: type: string format: url description: URL with placeholders that leads to a token page example: https://explorer.mainnet.polygon.dev/token/{ADDRESS} tx_url_format: type: string format: url description: URL with placeholders that points to a transaction page example: https://explorer.mainnet.polygon.dev/tx/{HASH} home_url: type: string format: url description: URL leads to the explorer homepage example: https://explorer.mainnet.polygon.dev RPC: type: object description: Chain RPC servers data properties: internal_server_url_format: type: string format: url description: >- URL with placeholders of RPC server which can be used for project purposes example: https://mainnet.polygon.dev/{polygon_API_KEY} public_servers_url: type: array description: List of URL of public RPC servers which can be used by everyone items: type: string format: url example: https://mainnet.polygon.dev Flags-5: type: object description: Various chain related boolean flags required: - supports_trading - supports_sending - supports_bridge - supports_transactions - supports_positions - supports_nft_positions properties: supports_trading: type: boolean description: Whether trading is supported on Zerion for this chain or not example: true supports_sending: type: boolean description: Whether sending is supported on Zerion for this chain or not example: true supports_bridge: type: boolean description: Whether bridges are supported on Zerion for this chain or not example: true supports_transactions: type: boolean description: >- Whether transaction history is indexed for this chain. When false, the chain is excluded from transaction, chart and PnL responses, and naming it explicitly in filter[chain_ids] on those endpoints returns 400. example: true supports_positions: type: boolean description: >- Whether wallet positions (token balances and DeFi positions) are indexed for this chain. When false, the chain is excluded from position, chart and PnL responses, and naming it explicitly in filter[chain_ids] on those endpoints returns 400. example: true supports_nft_positions: type: boolean description: >- Whether NFT positions and NFT collections are indexed for this chain. When false, the chain is excluded from NFT responses, and naming it explicitly in filter[chain_ids] on those endpoints returns 400. example: true ResponseShort: type: object required: - links - data properties: links: $ref: '#/components/schemas/ResponseLinks-13' data: $ref: '#/components/schemas/ContainerShort-5' ResponseLinks-13: type: object properties: related: type: string format: url example: >- https://api.zerion.io/v1/fungibles/0x2af1df3ab0ab157e1e2ad8f88a7d04fbea0c7dc6 ContainerShort-5: type: object required: - type - id properties: type: type: string description: Fungible resource type example: fungibles id: type: string description: Fungible unique identifier example: '0x2af1df3ab0ab157e1e2ad8f88a7d04fbea0c7dc6' securitySchemes: APIKeyBasicAuth: type: http scheme: basic description: >- To test endpoints here, paste your API key from the [Dashboard](https://dashboard.zerion.io/) into the username field and leave the password empty. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.