Build on AINDEX: public API and open contracts

Everything AINDEX runs on is public: a read API with no key, the MCP server the agents use, and the contracts on Robinhood Chain.

All on https://aindex.capital, as JSON. For an agent, the MCP server does more than read: it prepares every transaction a wallet needs, and llms.txt explains AINDEX to a model in one page.

An AINDEX agent is a wallet with accounts on Lighter, main Lighter and Hyperliquid, and a runtime that trades for it every minute. Your code, or any AI, can use all of it: one order, a swap, a standing strategy, a market-making quote, or just its reads. Make an access key on your portfolio (Use from Claude). A key that may only read gets the reads; one that may also act can call tools. No key ever withdraws, changes limits or touches keys: money leaves an agent only to your own wallet, with your sign-in.

curl -X POST https://aindex.capital/v2/me/agents/$AGENT/act \
  -H "authorization: Bearer $AINDEX_KEY" -H "content-type: application/json" \
  -d '{"calls": [
    {"name": "get_account"},
    {"name": "decide", "input": {"decisions": [{"verdict": "Enter", "instrument": "hyperliquid:ETH",
      "venue": "hyperliquid", "side": "long", "sizeUsd": 50, "leverage": 3, "entry": {"type": "market"},
      "stop": 2900, "takeProfit": 3600, "reason": "breakout above the range"}]}}
  ]}'

Each call runs as the agent's own would, through its limits and the venue's checks, and is kept in its runs. An order from your code is placed whether or not a strategy runs, and in "asks first" too. A call takes a few seconds, and its answer says how long each part took (timing); one still running after about 25 s answers with a request id for act/:request. Reads AINDEX already holds come back at once: get_account as last read (send {"fresh": true} to read it now) and get_strategy. Set webhook to a public https URL and AINDEX pings it with {agent, at, kinds} when something happens; the ping carries no data, so read the feed with your key. The same tools are in the MCP server as list_agent_tools, call_agent_tools and get_agent_feed.

Trading is free to call; AINDEX earns from the trade fee on each fill. Market and data reads by an agent your own AI or code runs count against a daily allowance for your account: 500 reads a day, plus 1,000 a day for every $1 of trade fees your agents paid in the last 30 days. Past it, each read costs $0.001 of credits, and with no credits a request of reads answers 402. Orders, closes, stops, strategy changes and reads of the agent's own account (get_account, get_fills, get_strategy) are never counted. Each answer that counted reads carries usage. Agents that think with a model AINDEX runs are not counted. To add credits, send USDG on Robinhood Chain from a wallet linked to your account to the address in GET /v2/me/credits; POST /v2/me/credits/pay prepares that transaction (or an ETH one) for your wallet to sign, and a 402 answer carries the same in topUp. An agent made with a key or through MCP also tops up your credits from its own wallet when they run low.

The contracts of the discontinued Funds are open source at github.com/aindex-capital/funds-contracts. Every deployed address is on Contracts.