Hashing, HMAC & Checksum Suite

Name: Hashing, HMAC & Checksum Suite
Price: 0.01 USDC
Availability: InStock

Give this API any text or binary data and it returns its fingerprint under whichever hash algorithms you choose - SHA-256, SHA-512, MD5, BLAKE2, CRC32 and more. It also signs data with a secret key (HMAC) and safely verifies whether an incoming signature matches, using a timing-safe comparison. Language models cannot hash: they emit a string of the right length and character set that is simply wrong, so every webhook check built on a guessed hash is silently broken.

InferenceLiveeip155:8453Exactvia cdp

https://hash-hmac.underscoredone.com/hash

Sha256 hashHashHmacHmac signatureVerify hmac signature

Calls · 30d

3↑ 24%

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 27 snapshots so far.

$46.98

Verified settled volume

664 settlements proven x402 by their on-chain EIP-3009 marker.

$0.010

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-09-14 19:48Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.01USDC≈ $0.01 USD

on Base · exact scheme

Pay 0.01 USDC on Base to 0xE974…C2F08. The signed payment is good for 5 minutes.

Paid to: 0xE974…C2F08
USD Coin contract: 0x8335…02913
Payment window: 5 minutes
As published: 10000 smallest units

10000units

on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 8ugAWA…zQT3b
Token contract: EPjFWd…TDt1v
Payment window: 5 minutes

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 300
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "feePayer": "Hc3sdEAsCGQcpgfivywog9uwtk8gUBUZgsxdME1EJy88"
    },
    "payTo": "8ugAWAXDB8V18kiUrGZTq1oMvU3C6Fxs8hfC6rvzQT3b",
    "amount": "10000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 300
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "hmac": {
            "key": "whsec_test_secret_key_123",
            "mode": "verify",
            "algorithm": "sha256",
            "expected_signature": "edddd7a6a42a411ab35b993d690cc7bd5d3be3d9262f66fef16ac2be10e0539a"
          },
          "input": "{\"order_id\":\"A-1029\",\"amount\":4200}",
          "algorithms": [
            "sha256",
            "sha512",
            "crc32"
          ],
          "input_encoding": "utf-8",
          "output_encoding": "hex"
        },
        "type": "http",
        "method": "POST",
        "bodyType": "json"
      },
      "output": {
        "type": "json",
        "example": {
          "hmac": {
            "mode": "verify",
            "matches": true,
            "algorithm": "sha256",
            "computed_signature": "edddd7a6a42a411ab35b993d690cc7bd5d3be3d9262f66fef16ac2be10e0539a"
          },
          "digests": {
            "crc32": "74c679bb",
            "sha256": "aa27c1f5aeb13292cb74153461b1eb3193efe4501c109a99103d304657798cf6",
            "sha512": "f9b133b06a4b7309392429f15108af870c073288f4297b85dba0ebb907f26c71a808abbe1d197f67ad4b7a1ab83507b1ac1774aa0a4295919e7b9697b395be07"
          },
          "api_version": "1.0.0",
          "input_bytes": 35
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "properties": {
            "body": {
              "type": "object",
              "required": [
                "input",
                "algorithms"
              ],
              "properties": {
                "hmac": {
                  "type": "object",
                  "description": "Optional. Include this block to sign data or verify a signature. Contains: mode ('sign' or 'verify'), algorithm (md5, sha1, sha256, or sha512), key (your full secret key as a string), and expected_signature (only needed when mode is 'verify')."
                },
                "input": {
                  "type": "string",
                  "description": "The text or data you want to hash. For binary data, base64-encode it first and set input_encoding to 'base64'."
                },
                "algorithms": {
                  "type": "array",
                  "description": "Which fingerprint methods to use. Choose any of: md5, sha1, sha224, sha256, sha384, sha512, sha3_256, sha3_512, blake2b, blake2s, crc32, adler32. You may list several at once."
                },
                "input_encoding": {
                  "type": "string",
                  "description": "How the input is encoded. Use 'utf-8' for normal text (default) or 'base64' for binary data."
                },
                "output_encoding": {
                  "type": "string",
                  "description": "How to display the resulting fingerprints. Choose 'hex' (default, lowercase letters and numbers), 'base64', or 'base64url' (safe for URLs)."
                }
              },
              "additionalProperties": false
            },
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "POST",
                "PUT",
                "PATCH"
              ],
              "type": "string"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string"
            },
            "example": {
              "type": "object",
              "required": [
                "api_version",
                "input_bytes",
                "digests",
                "hmac"
              ],
              "properties": {
                "hmac": {
                  "type": "object",
                  "additionalProperties": true
                },
                "digests": {
                  "type": "object",
                  "additionalProperties": true
                },
                "api_version": {
                  "type": "string"
                },
                "input_bytes": {
                  "type": "integer"
                }
              }
            }
          }
        }
      }
    }
  }
}

Provenance

Seen in the source catalog: 2026-09-14 19:48Z
Last indexed by Roundhouse: 2026-09-24 09:20Z
Last enriched (probe, favicon, geo): 2026-09-12 21:45Z
x402 version: 2
Max timeout: 300s
Liveness probe: HTTP 402

Report

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 27 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Open skill.md

Show the prompt

Using Roundhouse, look up the x402 service Hashing, HMAC & Checksum Suite and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Hashing%2C%20HMAC%20%26%20Checksum%20Suite'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://hash-hmac.underscoredone.com/hash, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402,
or use an organization key from https://roundhouseai.io/dashboard/team.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.