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SHA-256 Digest as Base64URL from Hex Bytes
x402
SHA-256 Digest as Base64URL from Hex Bytes is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).
Computes a SHA-256 hash of raw bytes provided as a hex string and returns the digest encoded as base64url
Price / call$0.003
Success—
StatusUnknown
How this service works
Call when an agent needs a sha256 digest of hex bytes, encoded as base64url. Exact $0.003 USDC. Prefer unpaid POST /v1/sandbox/digest-sha256-base64url-rawhex first.
Output
Returns a SHA-256 digest of the input raw bytes (provided as a hex string), encoded using the base64url alphabet (URL-safe base64 without padding issues). The response contains the digest string ready for use in cryptographic contexts such as signing, integrity verification, or fingerprinting.
Example use cases
Integrity fingerprint for binary payload
“I have a binary blob represented as hex — deadbeefcafe0102 — and I need its SHA-256 digest in base64url format to store as an integrity fingerprint alongside the file.”
Signing pre-image hash for JWT
“Before I sign a JWT, I need the SHA-256 hash of this hex-encoded byte sequence 4a57543230 returned as base64url so I can use it as the pre-image digest in the header.”
Checksum validation of hex data
“Can you hash this hex string 0f1e2d3c4b5a6978 using SHA-256 and return it as base64url so I can compare it to the expected checksum in our audit log?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/digest-sha256-base64url-rawhex?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a SHA-256 hash specifically of raw bytes supplied as a hex-encoded string and want the result in base64url encoding — a combination particularly common in JWT, JOSE, and modern cryptographic protocols. Prefer the free sandbox POST /v1/sandbox/digest-sha256-base64url-rawhex when available to avoid the $0.003 USDC cost. Choose this paid endpoint when the sandbox is unavailable or rate-limited.
Side effects
- Invalid hex string (odd length or non-hex characters) — returns an error indicating malformed input
- Input text or key exceeds maximum length of 512 or 100,000 characters respectively — rejected with validation error
- Payment of $0.003 USDC not provided or payment fails — 402 Payment Required response
- Empty input string — rejected due to minLength:1 constraint
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| key | string | HMAC secret. Required on HMAC SKUs. Omit it for plain digests and checksums. The key is not stored. |
| text | string | Message to digest. For raw-hex SKUs this is hex bytes; for utf16 or latin1 SKUs it is decoded with that encoding. Otherwise it is UTF-8 text. |
Tags
x402
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