Using Holdfill

• A Solana wallet such as Phantom, Solflare, or Backpack. The wallet only signs. Holdfill relays the transaction to devnet, so the wallet's own network setting doesn't matter.
• Orders use devnet replica tokens. Nothing on mainnet moves. Market prices shown in the app come from mainnet.
• PreStocks are unavailable in the U.S. and to U.S. persons. Read the issuer's terms.

• Connect your wallet and open the app.
• If you hold no replica SPACEX, use the faucet. It sends 1 replica SPACEX (5 shares) and a little devnet SOL for fees if your wallet is low.
• Pick the amount, the largest gap you accept, a fallback date, and a fallback floor.
• Sign once. That transaction creates the order and approves the order program for that amount only.

Entitlement

What the issuer says one raw SPACEX converts into: 5 SPCXx, one per share after the 5x split.

Gap

How far a payout falls below entitlement, fees included. A 29% gap pays 3.55 SPCXx per raw token.

Limit

The largest gap you accept, up to 60%. A 20% limit requires at least 4 SPCXx per raw token.

Fallback date

From this date the fallback floor replaces your limit. It must fall before the issuer deadline.

Fallback floor

The least you accept after the fallback date, as a share of entitlement: 40, 50, 60, or 70%.

Issuer deadline

12 March 2027, 23:59 UTC. The program refuses every fill after it.

Only SpaceX has an issuer conversion event today. For Anthropic and OpenAI, the app offers two order types on devnet replicas, against replica USDC.

Sell at your price

Set the least USDC per token and an expiry of 30 to 365 days. The program checks that the pool trades exactly this token against USDC, and never lets the order outlive an issuer deadline.

Arm for the IPO

Set the largest gap from the future entitlement, a fallback of 7 to 90 days before the future deadline, and a floor. Nothing sells until the issuer names a successor. The keeper then copies the issuer's terms into the order and fills at your limit. If no event comes, the order never fills.

Jupiter's trigger API refuses every PreStocks mint because of the transfer fee; the markets page checks this live. The demo shows a recorded arm, a simulated issuer event on a separate demo token, activation, and fill.

A keeper checks open orders every 10 seconds. When the pool quote meets your minimum, it calls the program's execute instruction. Anyone can call execute, and you can press Check now to run one pass yourself.

The program swaps through the Meteora DLMM pool as your approved delegate, measures what reached your SPCXx account, and reverts the whole transaction if it's below your minimum. Orders can fill in parts. The keeper sells the largest amount that still meets your terms.

Every fill also checks that the pool, mints, and token accounts match the order, the issuer hasn't paused the token or changed its transfer fee since you signed, your approval covers the amount, and the deadline hasn't passed.

Each wallet has one order per token at a time. A token account can approve only one delegate for one amount, so a second order would silently replace the first order's approval.

To change your terms, revoke the open order and set a new one. After a full fill, close the order. Closing returns the order account's SOL deposit.

Revoke closes the order and removes the approval in one transaction. Anything already filled stays in your wallet. After that, nothing can fill, and a fill attempt fails on chain. See the recorded example.

• The faucet only tops up wallets holding less than 0.5 raw replica SPACEX (2.5 shares).
• Each token has its own faucet limit. A wallet with an open order or remaining tokens can request once per hour. A wallet that sold everything and closed its order can refill right away.
• The faucet sends at most 20 grants per hour across all wallets.

Order program

A6Uh...aSGV

Lifecycle event

GZ1k...MUsQ

Replica SPACEX

5cY1...Ghsu

Replica SPCXx

4gG3...HitZ

SPACEX / SPCXx pool

5XhZ...jLzM

Replica USDC

BD2B...c88i

Replica ANTHROPIC

GNYx...oC2g

ANTHROPIC / USDC pool

BtUc...qYhr

Replica OPENAI

D5nC...P4tX

OPENAI / USDC pool

Gv78...gbPF

Read endpoints return JSON and need no key.

GET /api/market

Live mainnet quote, pool fee, transfer fee, and the issuer's conversion value.

GET /api/markets

Every PreStocks market: holders, value at mark, pool price, issuer fee, Jupiter Trigger result, and lifecycle events.

GET /api/issuer

Open Holdfill orders on devnet by market, with live approvals, coverage, and conversions.

GET /api/history

Daily close gap since listing, with dated unlocks.

GET /api/backtest?limit=2000

How many trading days a limit, in basis points, would have filled.

GET /api/position?owner=&market=

Mainnet balance (read only), devnet replica balances, the devnet quote, and the open order. market is SPACEX (default), ANTHROPIC, or OPENAI.

GET /api/orders?owner=&market=

Order history from on-chain events.

GET /api/jupiter-check

Live test that Jupiter's trigger API refuses the PreStocks mint.

GET /api/program

The order program's current upgrade authority.

The proof page links every recorded devnet transaction and the local fork proof, which runs the same program against cloned mainnet mint and pool state. The evidence page shows the market data behind the product.