Supported Assets - StellarX402

Any SEP-41 compliant Soroban token can be used, subject to the facilitator’s ALLOWED_ASSETS whitelist. USDC is the default and the only widely deployed choice today.

USDC

Network	Contract address	Decimals
`stellar:testnet`	`CBIELTK6YBZJU5UP2WWQEUCYKLPU6AUNZ2BQ4WWFEIE3USCIHMXQDAMA`	7
`stellar:pubnet`	`CCW67TSZV3SSS2HXMBQ5JFGCKJNXKZM7UQUWUZPUTHXSTZLEO7SJMI75`	7

Amounts on the wire are integers in the smallest unit (10^-7 USDC). Use the SDK helpers formatAmount and parseAmount rather than doing arithmetic by hand.

Adding a new asset (operator)

ALLOWED_ASSETS=USDC,EURC
ASSET_OVERRIDES='{"EURC":{"stellar:pubnet":"C...","decimals":7}}'

Restart. GET /supported now returns the new asset. See Configuration Reference.

Notes

The asset must implement SEP-41. Legacy classic assets are not usable directly; use the SEP-41 wrapper contract.
Sellers price in one asset per endpoint. Multi-asset pricing is planned but not implemented.
Buyers cannot pay in a different asset than the seller quoted — /verify returns asset_not_supported.