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402utils Hash / Checksum API
x402
402utils Hash / Checksum API is a paid API for AI agents from 402utils.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Computes cryptographic hashes (SHA-256, SHA-512, SHA-1, MD5) of a UTF-8 string or raw bytes, returning lowercase hex digests for each requested algorithm.
Price / call$0.001
Success—
StatusUnknown
How this service works
Compute cryptographic hashes / checksums of a string or of raw bytes (base64). Returns lowercase hex for each requested algorithm: sha256 (default), sha512, sha1, md5. SHA via native Web Crypto; md5 and sha1 are offered for legacy interop only and flagged — not for security. POST so the input never lands in a URL/log. Verification/checksums only, not a hash cracker.
Output
A JSON object mapping each requested algorithm name to its lowercase hex digest string, e.g. {"sha256": "dffd6021bb2bd5b0af676290809ec3a53191dd81c7f70a4b28688a362182986d", "sha512": "..."}. SHA-1 and MD5 results are flagged as legacy/not for security use.
Example use cases
Verify downloaded file integrity
“I just downloaded a config file and the vendor says the SHA-256 should be a specific value. Can you hash the raw bytes of this file and check whether the digest matches what they provided?”
Generate MD5 checksum for legacy system
“Our old storage system requires an MD5 checksum for every record we upload. Can you compute the MD5 of this string so I can include it in the metadata before we send it over?”
Compute multiple hashes at once
“I need to cross-check a message against three different systems that each expect a different algorithm — can you hash this payload and give me the SHA-256, SHA-512, and MD5 all in one go?”
Technical details
Endpoint
POSThttps://402utils.com/v1/hashWhen to prefer
Use this endpoint when you need a quick, serverless hash computation without running local crypto libraries — especially useful in agent pipelines needing integrity verification, when you want multiple algorithms in one call, or when you need SHA-256/SHA-512 via Web Crypto with a pay-per-call model rather than maintaining infrastructure. Prefer over alternatives when you need the input kept out of URLs and logs (POST body), and when you want MD5/SHA-1 flagged for legacy interop.
Side effects
- Missing both 'text' and 'bytes' fields — returns 400 error
- Both 'text' and 'bytes' provided simultaneously — ambiguous input, likely 400
- Invalid base64 encoding in 'bytes' field — returns 400 or decoding error
- Unsupported algorithm value outside enum — returns 400 validation error
- Empty string or zero-length input — may return valid hash of empty input or 400 depending on implementation
- Payment failure (402) if USDC not provided via x402 protocol
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | string | UTF-8 text to hash. |
| bytes | string | Raw bytes as base64 (standard or url-safe) — alternative to `text`. |
| algorithms | array | Which digests to compute (default ["sha256"]). |
Tags
x402
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