{"uid":"cap_msRCfOSRxep7pM9vxla1s","slug":"iot-halowerk-com-ota-firmware-release-tagger-ef71ca84","name":"iot.halowerk.com OTA Firmware Release Tagger","description":"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.","url":"https://iot.halowerk.com/v1/ota-sign","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"version":{"type":"string","maxLength":64,"minLength":1},"device_model":{"type":"string","maxLength":128,"minLength":1},"firmware_sha256":{"type":"string","pattern":"^[0-9a-fA-F]{64}$"},"minimum_bootloader":{"type":"string","maxLength":64,"minLength":1},"ephemeral_release_key":{"type":"string","maxLength":512,"minLength":16,"description":"Ephemeral example key; do not submit a long-lived production signing key."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_8f3AdJ3Pl3egzf3NdoVfd","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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.","exampleAgentPrompt":"Create a firmware release tag for device model 'ESP32-S3-MINI', firmware version '2.4.1', minimum bootloader '1.2.0', firmware SHA-256 'a3f1c2d4e5b6789012345678901234567890abcdef1234567890abcdef123456ab', using ephemeral key 'release-ephemeral-key-abc123xyz'.","exampleUseCases":[{"title":"OTA release tagging for edge devices","prompt":"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."},{"title":"Firmware integrity check before fleet rollout","prompt":"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'."},{"title":"Audit trail tag for embedded firmware release","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:35:41.796Z","isFirstParty":false}