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# Sending USDC programmatically

The canonical call:

```ts
const result = await bs.agents.send(agentId, { to, amount, memo });
```

## Inputs

| Field    | Type    | Notes                                     |
| -------- | ------- | ----------------------------------------- |
| `to`     | string  | base58 Solana address, 32–64 chars        |
| `amount` | number  | whole USDC, positive, up to 6 decimals    |
| `memo`   | string? | ≤ 200 chars, written to the on-chain memo |

## Outputs

```ts
{ status: "sent", signature: "5K..." }
{ status: "pending_approval", approval_id: "uuid" }
```

Or throws a `BlackSheepError`:

* `400` — invalid input.
* `403` — `Blocked by policy` (see audit log for which rule).
* `404` — agent not found.
* `409` — insufficient USDC / SOL on the wallet.

## Idempotency

`send` is **not** idempotent. Calling it twice with the same payload sends twice. If you need at-most-once semantics, generate your own request ID, store it client-side before calling `send`, and skip duplicates.

A native `Idempotency-Key` header is on the roadmap.

## Fees

* Solana network fee: \~0.000005 SOL per tx (paid from the agent's SOL balance).
* Black Sheep platform fee: **none** on the open beta.

## Confirmation semantics

The call resolves only after the tx is `confirmed` (Solana commitment level `confirmed`, not `finalized`). For most use cases this is enough; if you need `finalized`, re-fetch the signature later via Solana RPC.

## Bulk sends

For lists of payments, fire `send` concurrently with a small concurrency limit (e.g. p-limit 5). The server handles them independently — there's no batch endpoint yet.

```ts
import pLimit from "p-limit";
const limit = pLimit(5);
await Promise.all(invoices.map(inv =>
  limit(() => bs.agents.send(agentId, { to: inv.to, amount: inv.amount, memo: inv.id }))
));
```


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