---
title: "Request Spark identity-key signing"
method: POST
path: "/adapters/spark/identity/sign"
tags: ["Adapters"]
---

# Request Spark identity-key signing

`POST /adapters/spark/identity/sign`

The mock Spark adapter fails closed with 501 and never fabricates signatures. A real provider must be configured before this can return a signature.

## Headers

- `X-Steward-Request-Timestamp` string
- `X-Steward-Request-Expires-At` string
- `X-Steward-Signature` string
- `X-Steward-Signing-Key-Id` string
- `Idempotency-Key` string

## Request body

- object
  - `walletId` string, required
  - `payload` string, required

## Other responses

- `400` — JSON response
- `401` — JSON response
- `403` — JSON response
- `404` — JSON response
- `408` — JSON response
- `409` — JSON response
- `501` — JSON response

## Changes

- **2026-08-17** `261a7c8070b2` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/steward-fi/apis/steward-api/changes/adapters/spark/identity/sign/post.md)

---

[API](https://skmtc.dev/steward-fi/apis/steward-api.md) · [All operations](https://skmtc.dev/steward-fi/apis/steward-api/llms.txt) · [OpenAPI document](https://skmtc.dev/steward-fi/apis/steward-api/revisions/b88b4b97a664?raw)