Paymaster API

The Paymaster API signs or sponsors transactions and reads paymaster balance state through API-key guarded runtime endpoints.

Auth

Use an API key:

Authorization: Bearer sk_your_api_key

Developer-portal admin endpoints are intentionally omitted from this reference.

Get balance

GET /paymaster/balance Query parameters:

Parameter	Type	Description
`network`	string	`devnet` or `mainnet`; empty defaults to `mainnet`
`kind`	enum	`PAYMASTER_KIND_API` or `PAYMASTER_KIND_IDP`

Response:

{
  "configured": true,
  "kind": "PAYMASTER_KIND_API",
  "id": "paymaster_123",
  "address": "PaymasterPublicKey",
  "label": "Production paymaster",
  "balanceLamports": "1000000000",
  "balanceSol": 1
}

Sign a transaction

POST /paymaster/sign

{
  "base58EncodedTransaction": "BASE58_TRANSACTION",
  "network": "devnet"
}

Response:

{
  "requestId": "req_123",
  "signedTransaction": "BASE58_SIGNED_TRANSACTION"
}

POST /paymaster/sponsor

{
  "base58EncodedTransaction": "BASE58_TRANSACTION",
  "network": "devnet"
}

Response:

{
  "requestId": "req_123",
  "signature": "TransactionSignature",
  "spentByPaymaster": "5000"
}

Paymaster limit configuration is handled through developer-portal admin surfaces, not API-key runtime endpoints.

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Runtime APIs

Paymaster API

Auth

Get balance

Sign a transaction

​Auth

​Get balance

​Sign a transaction

​Sponsor a transaction

Auth

Get balance

Sign a transaction

Sponsor a transaction