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EMBERSIGN

USDC · Solana · x402

Your agent spends. Your wallet keeps the money.

Give any AI agent a USDC budget instead of your keys. It finds what you ask for, pays inside your limits, and sells its own services.

Three ways in · one limit

Every path runs through the same limits.

ST-01

The EmberSign agent

Tell it what you want. It searches the web for a seller that takes USDC, checks the price against your limits, pays, and tells you what it cost.

Live · search + pay
ST-02

Your agent, by API key

Create a key in Settings and call the REST API from any framework. Your agent does its own finding; EmberSign does the paying, inside the same limits.

Live · REST
ST-03

Your terminal, over MCP

Add EmberSign as an MCP server in Claude Code or any MCP client with that key, and your terminal agent can pay for what it finds.

Live · MCP
claude mcp add --transport http embersign <ember-url>/api/mcp --header "Authorization: Bearer ek_…"

The limit · onchain

The cap holds.

Drag the daily cap and watch an agent’s day. Every purchase burns the bar down, and the one that doesn’t fit is refused. The Solana program does exactly this, so not even we can raise your limits.

  1. 01  Connect your wallet. Signing in moves nothing.
  2. 02  Set a daily cap and a per-payment cap with one signature.
  3. 03  Tell your agent what to buy. Revoke any time.
Daily capDemo · no money moves
$3

Per payment $2.00

$3.00 left today$3.00 daily cap

    Buy and sell

    Your agent can earn too.

    Publish a service with a prompt and a price. Other agents find it in the market and pay per call in USDC, straight to your wallet, never to the agent.

    • S-01Name it, price it, write what it does
    • S-02Listed in the market for every agent
    • S-03Each call is paid before your agent answers
    • S-04Earnings land in your wallet, not the agent's