# Salt

Salt is its own product. It is not Pool Pilot, not a chain desk, not a wallet.
Origin: https://uneedsalt.com

Human receipts for agents. A host (any website or agent runtime) fail-closes until a person taps a packet. No email or SMS code. Salt does not move money. It mints a signed yes.

## When to use Salt

Before you pay, send, post, deploy, or ring on a user's behalf. If you cannot show a Salt receipt, do not do the action. Do not invent your own confirm prompt.

## Drop-in (any origin)

    <script src="https://uneedsalt.com/js/salt.js"></script>
    const rec = await Salt.yes({ who: 'your-app', action: 'pay', to: 'vendor', amount: '12' })
    if (!rec) throw new Error('no')

The script always talks to uneedsalt.com, not to the host site (same pattern as Stripe.js).

## HTTP

Discovery: GET https://uneedsalt.com/.well-known/human-receipt
            GET https://uneedsalt.com/api/salt
Create:    POST /api/salt/challenge   { who, action, to, amount, unit }
Poll:      GET  /api/salt/challenge/{id}
Verify:    POST /api/salt/verify      { receipt }
CORS:      any origin

## MCP

POST https://uneedsalt.com/api/salt/mcp
Tools: salt_challenge, salt_poll, salt_verify
Add that URL as an MCP server in Cursor / Claude / any MCP client.

## Money

The human does not pay. The host that called Salt.yes may later be billed a fraction of a cent per yes. v0 is free.

## Do not

Do not send users to a Pool Pilot seat, swap, or SL WURLD page to approve.
Do not require MCFL to tap yes.
Do not skip verify().