> ## Documentation Index
> Fetch the complete documentation index at: https://docs.momentra.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Credits & billing

> How the MCP credit model and the ZeroClick unit model line up.

The two surfaces bill the same underlying `momentra-events` work through
different accounting, kept aligned at a fixed rate so their free tiers are
comparable.

| | MCP | ZeroClick |
| - | - | - |
| Unit | prepaid **credits** | per-request **ZC units** |
| Index an org | `index_org` — 40 credits (10 refresh) | `orgs_index` — 4 ZC (qty 1) |
| Read events | `fetch` — 1 credit/id | `events_pull` — 1 ZC (qty 1) |
| Discovery | `search` and helpers — free | `search/*`, `orgs/{jobId}`, `report` — free |
| Free allowance | 100 credits on signup | \~10 ZC / buyer (lifetime) |

**Conversion:** 1 ZC = 10 M (credits). `orgs_index` is at exact 40-credit parity;
`events_pull` meters in whole ZC units, which is 10× the MCP per-id cost — an
intentional whole-unit-metering divergence. These constants live in
`functions/zeroclick/pricing.ts`.

## MCP credit model

<Card title="MCP billing" icon="plug" href="/mcp/billing">
  Full detail: signup grant, the per-UTC-day free cap (80/account, 400 across all
  free accounts), checkout, and the success-shaped billing directives.
</Card>

* **Free on signup:** 100 credits, once per account on first connect (tied to a
  real Stripe checkout).
* **`index_org`:** 40 credits fresh; 10-credit refresh within 30 days of a
  successful, non-empty index. Non-starters and failures aren't charged.
* **`fetch`:** 1 credit per id (idempotent per id per day).
* **Everything else** is free.

## ZeroClick unit model

<Card title="ZeroClick free & paid" icon="scale-balanced" href="/zeroclick/free-and-paid">
  Full detail: the two kinds of free work and how `includedUnits` back the free
  trial.
</Card>

* **Free identity routes:** `search/*`, `orgs/{jobId}`, `report` — identity check
  only, no settlement.
* **Paid meters:** `orgs_index`, `events_pull` — allowance-checked and settled via
  a `zc-usage` header on the `2xx`.
* **Free trial:** ZeroClick-owned `includedUnits` per buyer, \~10 ZC lifetime —
  mirrors the MCP 100-credit signup grant.

<Note>
  On both surfaces, a paid call with no balance returns a directive carrying a
  checkout link rather than doing the work — the agent pays and retries. Nothing
  is charged on a non-2xx.
</Note>


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