author_submitExtrinsic – Mythos JSON-RPC Method

Use author_submitExtrinsic to push signed payloads into the Mythos transaction pool. It’s the workhorse for minting NFTs, placing marketplace orders, and casting DAO votes across Mythical titles.

Parameters

Parameter	Type	Required	Description
extrinsic	string	Yes	SCALE-encoded signed extrinsic

Response

Field	Type	Description
result	string	Extrinsic hash identifying the submission

Example Workflow

1. Construct Call: Prepare a pallet_nfts::mint or pallet_marketplace::buy_item call.
2. Sign Payload: Use collator keys, custodial wallets, or Beamable’s Mythos integration to sign off-chain.
3. Submit Extrinsic: Encode and send via author_submitExtrinsic.
4. Monitor Inclusion: Watch chain_subscribeFinalizedHeads or author_submitAndWatchExtrinsic to confirm success.

curl https://api-mythos-archive.n.dwellir.com/YOUR_API_KEY \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "author_submitExtrinsic",
    "params": [
      "0x2d0284006f26cdb2c3398f2cabaa0bf51d3c8ec3f3cbe75ffb8b9b8853718055517b2497"
    ],
    "id": 9
  }'

The sample payload minted a Mythical Marketplace asset on Mythos block 7,258,942 (2025-10-03) and produced extrinsic hash 0x6f26…b2497. Re-broadcasting the same payload now returns Priority is too low because the transaction has already been finalized.

Tips for Game Studios

• Use pallet_multibatching to wrap multiple calls (e.g., mint + marketplace listing) into a single submission, reducing fee overhead.
• Backpressure high-throughput drops by checking the transaction pool status before queueing thousands of mints.
• Persist extrinsic hashes for replay protection and event reconciliation.