{"chain":"stellar","network":"stellar:pubnet","total_assets":2,"recipient":"GD7OQXTJZMHFJ3W5ORJAJJAWQW365FNBP5I5XJ6ND43QCDIB257FZCJR","fee_sponsorship":true,"settlement":"~5 seconds (deterministic finality)","fees":"Sub-cent (~0.00001 XLM per tx)","protocol":"SEP-41 token standard","assets":{"USDC":{"name":"USD Coin","code":"USDC","issuer":"GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN","decimals":7,"type":"credit_alphanum4","peg":"USD","description":"Circle-issued USDC stablecoin on Stellar (1:1 USD)","network":"stellar:pubnet"},"XLM":{"name":"Stellar Lumens","code":"XLM","issuer":"native","decimals":7,"type":"native","peg":null,"description":"Stellar native asset","network":"stellar:pubnet"}},"howto":{"step_1":"Call any NEXUS paid endpoint -> receive 402 with method='stellar' in challenge","step_2":"Build a SEP-41 transfer for the specified amount + currency to the recipient address","step_3":"Sign and broadcast the transaction on Stellar network","step_4":"Retry with Authorization: Payment <credential> containing {method:'stellar', payload:{tx_hash, currency}}","step_5":"NEXUS verifies the tx on Stellar Horizon and returns 200 + Payment-Receipt"},"fee_sponsorship_note":"When fee sponsorship is enabled, NEXUS pays the Stellar gas fee on your behalf. You only need the payment token (e.g., USDC) -- no XLM required for gas.","fee_sponsor":{"enabled":true,"fee_payer":"GCVFHLICNSIXEZ4SBLRX6DXRTDPXYNNLDTTWGKAHVD2AM6ZZLO275Q42","description":"NEXUS pays Stellar gas fees on behalf of agents. Submit your signed (but not broadcasted) transaction XDR to the sponsor endpoint. NEXUS wraps it in a fee bump envelope and broadcasts it. Your payment is never modified — only the gas fee layer is added.","endpoint":"/api/mpp/stellar/sponsor","method":"POST","body":{"signed_xdr":"<base64 XDR of your signed transaction>"},"cost_to_agent":"0 XLM (NEXUS absorbs ~0.00001 XLM per tx)","how_it_works":{"step_1":"Build your payment transaction (USDC/XLM to NEXUS recipient)","step_2":"Sign it with your keypair","step_3":"POST the signed XDR (base64) to /api/mpp/stellar/sponsor","step_4":"NEXUS wraps it in a fee bump, signs the outer layer, broadcasts it","step_5":"Receive tx_hash — use it in your MPP credential to access the service"}},"sdk":{"official":"pip install stellar-sdk (Python) or npm install @stellar/mpp (TypeScript)","mpp_python":"pip install pympp"}}