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Documentation Index

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Fee payer API

The fee payer endpoint sponsors transaction fees for users on the Tempo network. Users can send transactions without holding gas tokens — the platform pays fees from an operator wallet. This endpoint works with the MPP payment flow and the Tempo wallet integration. 
POST /api/fee-payer
Accepts a Tempo transaction and sponsors its gas fees. The request body is forwarded to the Handler.feePayer handler from tempo.ts/server.

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Request

The request body should be a JSON object containing the Tempo transaction to sponsor. The exact format is defined by the tempo.ts SDK.

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Response

On success, returns the result from the fee payer handler (format defined by tempo.ts).

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Errors

CodeDescription
503Fee payer not configured. The TEMPO_FEE_PAYER_KEY environment variable is not set.

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Check fee payer status

GET /api/fee-payer
Returns the current status and network configuration of the fee payer.

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Response

{
  "status": "ready",
  "chain": "Tempo",
  "chainId": 4217
}

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Response fields

FieldTypeDescription
statusstringready when the fee payer is configured, disabled otherwise
chainstringNetwork name (Tempo or Tempo Testnet)
chainIdnumberChain ID (4217 for mainnet, 42431 for testnet)
The network is determined by the TEMPO_TESTNET environment variable. When set to true, the fee payer uses the Tempo testnet (chain ID 42431).

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How gas sponsorship works

Tempo supports protocol-level gas sponsorship. When a user submits a transaction through this endpoint:
  1. The user signs their transaction normally.
  2. The transaction is sent to the fee payer endpoint.
  3. The operator wallet pays the gas fee on behalf of the user.
  4. The transaction is submitted to the Tempo network.
This removes the need for users to hold native gas tokens and reduces friction for on-chain payments.