> ## Documentation Index > Fetch the complete documentation index at: https://docs.bridg.now/llms.txt > Use this file to discover all available pages before exploring further. # Get source chains > Every chain a transfer can start from right now, with how many venues accept it as an origin. Cache it; it changes when a venue adds or drops a chain. ## OpenAPI ````yaml openapi/openapi.json GET /bridge/source-chains openapi: 3.1.0 info: title: Bridg API version: 1.0.0 description: >- Quote, build, submit and track cross-chain transfers across every venue Bridg aggregates. servers: - url: https://api.bridg.now/v1 security: [] paths: /bridge/source-chains: get: tags: - bridge summary: Get source chains description: >- Every chain a transfer can start from right now, with how many venues accept it as an origin. Cache it; it changes when a venue adds or drops a chain. responses: '200': description: One row per source-capable chain content: application/json: schema: type: object properties: chains: type: array items: type: object properties: chain: type: string enum: - ethereum - arbitrum - optimism - base - polygon - bnb - avalanche - linea - scroll - zksync - mantle - blast - mode - gnosis - celo - unichain - sonic - ink - plume - worldchain - monad - sei - xlayer - plasma - berachain - hyperevm - stable - robinhood - arc - fantom - zircuit - lisk - soneium - abstract - taiko - metis - moonbeam - aurora - cronos - opbnb - ronin - rootstock - citrea - botanix - katana - solana - fogo - eclipse - bitcoin - litecoin - dogecoin - bitcoincash - zcash - dash - sui - aptos - movement - starknet - tron - ton - stellar - cardano - xrpl - near - algorand - polkadot - assethub - injective - noble - osmosis - cosmoshub - hypercore - lighter venues: type: integer minimum: 0 exclusiveMinimum: true required: - chain - venues required: - chains example: chains: - chain: abstract venues: 6 - chain: algorand venues: 3 - chain: aptos venues: 5 - chain: arbitrum venues: 20 - chain: arc venues: 7 - chain: avalanche venues: 18 - chain: base venues: 20 - chain: berachain venues: 7 - chain: bitcoin venues: 10 - chain: bitcoincash venues: 6 - chain: blast venues: 6 - chain: bnb venues: 17 - chain: cardano venues: 4 - chain: celo venues: 9 - chain: citrea venues: 1 - chain: cosmoshub venues: 4 - chain: cronos venues: 9 - chain: dash venues: 3 - chain: dogecoin venues: 6 - chain: eclipse venues: 1 - chain: ethereum venues: 20 - chain: fantom venues: 1 - chain: fogo venues: 1 - chain: gnosis venues: 8 - chain: hypercore venues: 3 - chain: hyperevm venues: 13 - chain: injective venues: 4 - chain: ink venues: 8 - chain: katana venues: 6 - chain: lighter venues: 4 - chain: linea venues: 15 - chain: lisk venues: 4 - chain: litecoin venues: 6 - chain: mantle venues: 11 - chain: metis venues: 4 - chain: mode venues: 5 - chain: monad venues: 13 - chain: movement venues: 1 - chain: near venues: 4 - chain: noble venues: 1 - chain: opbnb venues: 7 - chain: optimism venues: 18 - chain: osmosis venues: 2 - chain: plasma venues: 13 - chain: plume venues: 6 - chain: polkadot venues: 1 - chain: polygon venues: 18 - chain: robinhood venues: 11 - chain: ronin venues: 5 - chain: rootstock venues: 5 - chain: scroll venues: 7 - chain: sei venues: 9 - chain: solana venues: 18 - chain: soneium venues: 8 - chain: sonic venues: 10 - chain: stable venues: 9 - chain: starknet venues: 8 - chain: stellar venues: 6 - chain: sui venues: 8 - chain: taiko venues: 3 - chain: ton venues: 8 - chain: tron venues: 13 - chain: unichain venues: 11 - chain: worldchain venues: 7 - chain: xlayer venues: 7 - chain: xrpl venues: 7 - chain: zcash venues: 3 - chain: zircuit venues: 2 - chain: zksync venues: 10 '400': description: >- Malformed request, an unknown asset, or a signed transaction that is not what we built content: application/json: schema: type: object properties: error: type: object properties: code: type: string message: type: string details: type: object additionalProperties: nullable: true retryAfterMs: type: integer required: - code - message required: - error '404': description: No such decision or transfer, or the aggregator is switched off content: application/json: schema: type: object properties: error: type: object properties: code: type: string message: type: string details: type: object additionalProperties: nullable: true retryAfterMs: type: integer required: - code - message required: - error '409': description: >- The decision is indicative, the quote expired or drifted, the venue is ineligible, or execution is switched off content: application/json: schema: type: object properties: error: type: object properties: code: type: string message: type: string details: type: object additionalProperties: nullable: true retryAfterMs: type: integer required: - code - message required: - error '429': description: Rate limited; retry after `retryAfterMs` content: application/json: schema: type: object properties: error: type: object properties: code: type: string message: type: string details: type: object additionalProperties: nullable: true retryAfterMs: type: integer required: - code - message required: - error '502': description: The venue refused to build, or the broadcast was rejected content: application/json: schema: type: object properties: error: type: object properties: code: type: string message: type: string details: type: object additionalProperties: nullable: true retryAfterMs: type: integer required: - code - message required: - error ````