---
title: "STORE: upload a file (any bytes) in a single paid call..."
method: POST
path: "/api/store/blob-put"
tags: ["store"]
---

# STORE: upload a file (any bytes) in a single paid call...

`POST /api/store/blob-put`

## Request

- Base URL: `https://2s.io`
- URL: `https://2s.io/api/store/blob-put`
- Auth: API key in header `PAYMENT-SIGNATURE`

STORE: upload a file (any bytes) in a single paid call, scoped to YOUR wallet. Send the file base64-encoded in `data` with an optional contentType; we store it privately and key it to your payer address. Read it back with store.blob-get. Up to 3 MB per file (one-call limit); 50 MB total per wallet across kv/documents/vectors/files. Kept on a rolling 90-day window that resets on every touch. There is NO public URL — only paid store.blob-get can read it, so your bytes are never fetchable without payment. No account or API key.

## Request body

- object
  - `ns` string, required: Namespace to group blobs, 1-64 chars of [A-Za-z0-9._:-]. e.g. "uploads".
  - `key` string, required: Key within the namespace, up to 256 chars. e.g. "snapshot-42.json".
  - `data` string, required: The file bytes, base64-encoded. Decoded size up to 3 MB.
  - `contentType` string: MIME type to return on read. e.g. "application/json", "image/png". Default application/octet-stream.

## Other responses

- `200` (unresolved $ref)
- `400`: Invalid request — not charged. error.code: BAD_REQUEST or INVALID_PARAM (parameter validation; error.details.issues lists each problem), MALFORMED_JSON, or a request-specific code. Other client errors: 405 METHOD_NOT_ALLOWED (wrong verb; see the Allow header), 413 PAYLOAD_TOO_LARGE.
- `402`: Payment required. Body is the x402 PaymentRequirements envelope with a multi-network accepts array; the per-call price is in accepts[].amount (and on the operation as x-2s-price). Sign for whichever rail you hold USDC on (EIP-3009 for Base, partial SPL transfer for Solana) and retry with the PAYMENT-SIGNATURE header (X-PAYMENT also accepted for v1 clients). Also PAYMENT_SETTLE_FAILED (error envelope) when a verified payment failed to settle: error.details.chargeStatus is "not_charged" (retry with a fresh payment) or "unknown" (the authorization may still settle before its deadline — check it before retrying).
- `429`: Too many requests — RATE_LIMITED: our per-IP / per-payer limiter. Not charged; retry after Retry-After.
- `5XX`: Server-side failure. 500 INTERNAL: unexpected error; quote error.errorId (also the X-2s-Error-Id header). 502 UPSTREAM_UNAVAILABLE (or another UPSTREAM_* code): the data provider failed — composite endpoints refuse unbilled when every source fails. 503 SERVICE_PAUSED: endpoint paused by the operator kill switch, retry after Retry-After; 503 SPEND_CAP: daily upstream budget exhausted. 504 UPSTREAM_TIMEOUT. Not charged.

---

[API](https://skmtc.dev/2s-io/apis/2s-the-most-everything-api.md) · [All operations](https://skmtc.dev/2s-io/apis/2s-the-most-everything-api/llms.txt) · [OpenAPI document](https://skmtc.dev/2s-io/apis/2s-the-most-everything-api/revisions/da4c5caf686e?raw)