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

Quote filling an offer

post/forwards/offers/{boxId}/fill/check

What filling an offer takes from this wallet and the side it would hold. offer.fillable says whether a fill sent now would be accepted, and offer.refusal why not. No body.

Path parameters

  • boxIdstringrequired

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

Responses

200Quote for the fillDFFillQuote▶
  • ▶
    offerDFOfferViewrequired
    • boxIdstringrequired
    • makerstringrequired

      Address the maker is paid to.

    • makerSidestringrequired

      long is paid when the window's mean difficulty is above the strike, short when below.

      one oflongshort
    • strikestringrequired

      Difficulty the window's mean is measured against.

    • notionalstringrequired

      LIT base units.

    • marginstringrequired

      Each side's margin, a fifth of the notional, and the most either side can lose of it.

    • windowStartinteger · int32required
    • windowLengthinteger · int32required
    • windowEndinteger · int32required

      The window's last epoch.

    • expiryinteger · int32required

      The last height a fill can be mined at.

    • lastFillHeightinteger · int32required

      The last height a fill can actually be mined at: the expiry, or earlier when the window would start less than 2 epochs after the fill.

    • litstringrequired

      LIT base units the offer holds.

    • nanoErgsstringrequired
    • takerLitstringrequired

      LIT base units a fill takes from the taker.

    • takerNanoErgsstringrequired

      nanoERG a fill takes from the taker, network fee included.

    • impliedMovenumber · double

      The strike against the current difficulty, as a fraction.

    • impliedMoveNextnumber · double

      The strike against nextDifficulty, when known.

    • minebooleanrequired

      Whether this wallet made the offer.

    • fillablebooleanrequired

      Whether this wallet's fill sent now would be accepted.

    • refusalstring

      Why not, when fillable is false.

  • takerSidestringrequired

    The side this wallet takes, opposite the maker's.

    one oflongshort
  • takerLitstringrequired
  • takerNanoErgsstringrequired

    Network fee included.

  • networkFeestringrequired
  • maxLossstringrequired

    The most this wallet can lose, its margin plus 7.5 LIT.

  • warningsstring[]required
400`boxId` is not a box id.ApiError▶
  • 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

422No accumulator is deployed.ApiError▶
  • errorintegerrequired

    Error code

  • reasonstringrequired

    Error message explaining the reason of the error

  • detailstringrequirednullable

    Detailed error description

503Node unavailable. Retry.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 an offerNext →Fill an offer
Request
curl -X POST "http://localhost:9000/forwards/offers/{boxId}/fill/check"
Response
{
  "offer": {
    "boxId": "string",
    "maker": "string",
    "makerSide": "long",
    "strike": "string",
    "notional": "string",
    "margin": "string",
    "windowStart": 0,
    "windowLength": 0,
    "windowEnd": 0,
    "expiry": 0,
    "lastFillHeight": 0,
    "lit": "string",
    "nanoErgs": "string",
    "takerLit": "string",
    "takerNanoErgs": "string",
    "impliedMove": 0,
    "impliedMoveNext": 0,
    "mine": true,
    "fillable": true,
    "refusal": "string"
  },
  "takerSide": "long",
  "takerLit": "string",
  "takerNanoErgs": "string",
  "networkFee": "string",
  "maxLoss": "string",
  "warnings": [
    "string"
  ]
}