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iot.halowerk.com OTA Firmware Release Tagger
x402
iot.halowerk.com OTA Firmware Release Tagger is a paid API for AI agents from iot.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Canonicalizes firmware metadata (hash, version, device model, minimum bootloader) and produces a SHA-256 manifest digest plus HMAC-SHA256 release tag using caller-supplied ephemeral key material.
Price / call$0.003
Success—
StatusUnknown
How this service works
Canonicalizes firmware hash, version, device model and minimum bootloader version, then produces a SHA-256 manifest digest and HMAC-SHA256 release tag using caller-supplied ephemeral key material. This is a symmetric integrity tag, not a vendor PKI signature or code-signing service.
Output
Returns a SHA-256 manifest digest computed from the canonicalized firmware metadata fields, and an HMAC-SHA256 release tag computed using the caller-supplied ephemeral key. Both values serve as integrity markers for the firmware release; the HMAC tag is symmetric and tied to the ephemeral key provided — it is not a vendor PKI or code-signing certificate.
Example use cases
OTA release tagging for edge devices
“I'm about to push a firmware update for our 'nRF9160-DK' devices — version '3.1.0', minimum bootloader '2.0.0', firmware hash 'deadbeefcafe1234567890abcdef1234567890abcdef1234567890abcdef1234', with ephemeral key 'eph-key-nrf-release-007'. Generate the manifest digest and HMAC release tag for me.”
Firmware integrity check before fleet rollout
“Before we roll out OTA firmware version '1.8.5' to our 'STM32H7B0' fleet, I need a canonical manifest digest and HMAC tag. The firmware SHA-256 is '0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef', minimum bootloader is '1.0.3', and use ephemeral key 'stm32-eph-release-key-9f2a'.”
Audit trail tag for embedded firmware release
“We need to stamp our embedded firmware release for the 'Raspberry Pi Pico W', version '0.9.2', bootloader minimum '0.5.0', hash 'fedcba9876543210fedcba9876543210fedcba9876543210fedcba9876543210', with ephemeral key 'pico-eph-hmac-key-audit42'. Give me the manifest digest and release tag for our audit log.”
Technical details
Endpoint
POSThttps://iot.halowerk.com/v1/ota-signWhen to prefer
Choose this endpoint when you need a lightweight, deterministic, symmetric integrity tag for IoT OTA firmware releases — especially when you control both the tagging and verification sides and can share the ephemeral key out-of-band. Prefer this over full PKI code-signing pipelines when you want a fast, low-cost per-release integrity stamp without certificate infrastructure. Not suitable when you need asymmetric vendor-signed firmware that devices can verify without a shared secret.
Side effects
- Invalid firmware_sha256 format (not 64 hex chars) returns a 400 validation error
- Missing required fields (version, device_model, firmware_sha256, minimum_bootloader, ephemeral_release_key) returns 400
- Ephemeral key shorter than 16 characters or longer than 512 characters returns 400
- Payment not provided or insufficient USDC results in 402 Payment Required
- Submitting a long-lived production key in the ephemeral_release_key field is a security misuse, though not blocked at the API layer
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| version | string | |
| device_model | string | |
| firmware_sha256 | string | |
| minimum_bootloader | string | |
| ephemeral_release_key | string | Ephemeral example key; do not submit a long-lived production signing key. |
Tags
x402
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