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    • getList open offers
    • postCreate an offer
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Lithos

A decentralized mining pool protocol on Ergo. Miners build their own blocks; contracts pay them for proven work.

Live on Ergo mainnet
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Lithos
© 2026 Lithos Protocol. The Lithos client, its contracts and Lithos Launcher are open source under CC0.λίθος — stone
Docs/Client API/Difficulty Forwards

Fill an offer

post/forwards/offers/{boxId}/fillapi_key

Take the other side of an offer: this wallet adds its margin plus 7.5 LIT and the position's ERG, and a position holding both sides is created. Refused when the fill would not be accepted in the next block. No body.

Path parameters

  • boxIdstringrequired

    Offer box id, as listed by GET /forwards/offers or GET /forwards/positions.

Responses

200Result of the fill transactionDFFillResult▶
  • txIdstringrequired
  • outcomestringrequired
    one ofacceptedrejecteduncertain
  • positionBoxIdstringrequired
400`boxId` is not a box id.ApiError▶
  • errorintegerrequired

    Error code

  • reasonstringrequired

    Error message explaining the reason of the error

  • detailstringrequirednullable

    Detailed error description

403Missing or wrong api_keyApiError▶
  • errorintegerrequired

    Error code

  • reasonstringrequired

    Error message explaining the reason of the error

  • detailstringrequirednullable

    Detailed error description

404No unspent offer has that id.ApiError▶
  • errorintegerrequired

    Error code

  • reasonstringrequired

    Error message explaining the reason of the error

  • detailstringrequirednullable

    Detailed error description

409An unconfirmed transaction already spends the offer. Re-read `GET /forwards/offers`.ApiError▶
  • errorintegerrequired

    Error code

  • reasonstringrequired

    Error message explaining the reason of the error

  • detailstringrequirednullable

    Detailed error description

422The offer is this wallet's own, short of the maker's side, expired, outside its window's lead for the next block, over the short-window limit, or the wallet cannot cover the fill.ApiError▶
  • errorintegerrequired

    Error code

  • reasonstringrequired

    Error message explaining the reason of the error

  • detailstringrequirednullable

    Detailed error description

503Node, wallet or transaction engine unavailable, or the request ran out of time. The message says whether anything was sent. When it says the outcome is unknown, check this wallet's offers and positions before retrying.ApiError▶
  • errorintegerrequired

    Error code

  • reasonstringrequired

    Error message explaining the reason of the error

  • detailstringrequirednullable

    Detailed error description

defaultErrorApiError▶
  • errorintegerrequired

    Error code

  • reasonstringrequired

    Error message explaining the reason of the error

  • detailstringrequirednullable

    Detailed error description

← PreviousQuote filling an offerNext →Quote cancelling an offer
Request
curl -X POST "http://localhost:9000/forwards/offers/{boxId}/fill" \
  -H "api_key: $LITHOS_API_KEY"
Response
{
  "txId": "string",
  "outcome": "accepted",
  "positionBoxId": "string"
}