> For the complete documentation index, see [llms.txt](https://docs.ur.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ur.app/api-reference/api/account/external-wallet-access-mode/get-supported-chain-config.md).

# Get supported chain config

Returns supported chains, token lists, contract addresses, and per-token Off-ramp and FX amount limits (minTopUpAmount, maxTopUpAmount, minFxAmount, maxFxAmount). Works logged in (adds balances and card eligibility) and logged out (config only). Read limits at request time; do not hardcode them.

```json
{"openapi":"3.1.0","info":{"title":"UR API","version":"1.0.0"},"tags":[{"name":"External Wallet Access Mode","description":"APIs signed by the user's own wallet key. Base URL https://api.ur.app."}],"servers":[{"url":"https://api.ur.app","description":"Production (user API)"},{"url":"https://urapi3-qa.ur-inc.xyz","description":"Testnet (user API)"}],"security":[],"paths":{"/api/v3/config/chain-configs":{"get":{"tags":["External Wallet Access Mode"],"operationId":"ewaGetChainConfigs","summary":"Get supported chain config","description":"Returns supported chains, token lists, contract addresses, and per-token Off-ramp and FX amount limits (minTopUpAmount, maxTopUpAmount, minFxAmount, maxFxAmount). Works logged in (adds balances and card eligibility) and logged out (config only). Read limits at request time; do not hardcode them.","parameters":[{"name":"tokenId","in":"header","required":false,"schema":{"type":"string"},"description":"The user's URID. Omit for a non-logged-in query (config only, no balances)."},{"name":"network","in":"header","required":false,"schema":{"type":"string"},"description":"Network identifier: 5000 for mainnet, 5003 for testnet."},{"name":"sign","in":"header","required":false,"schema":{"type":"string"},"description":"Signature generated by the user's wallet key (EIP-191)."},{"name":"hash","in":"header","required":false,"schema":{"type":"string"},"description":"SHA3/Keccak256 hash of the original request payload."},{"name":"deadline","in":"header","required":false,"schema":{"type":"string"},"description":"Signature expiry: server timestamp plus a validity window (max 20 minutes)."}],"responses":{"200":{"description":"Response envelope. For the user API, retCode 0 means success; for the partner API, code 0 means success. Business rejections return HTTP 200 with a non-zero code.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/EwaEnvelope"}}}}}}}},"components":{"schemas":{"EwaEnvelope":{"type":"object","properties":{"retCode":{"type":"integer","description":"0 on success; non-zero indicates failure.","format":"int64"},"retMsg":{"type":"string","description":"Human-readable message; error details when retCode is non-zero."},"result":{"description":"Business payload. Shape depends on the endpoint; some endpoints return it as a JSON-encoded string."},"timeNow":{"type":"integer","description":"Server timestamp in milliseconds.","format":"int64"}},"required":["retCode","retMsg"],"description":"Standard response envelope for the user API (api.ur.app)."}}}}
```


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