Api Endpoint

touchstone.locomot.io

Verifiable timestamp (trustless proof-of-existence / freshness proof): bind a hash to a drand round for an anti-backdating receipt — proves data existed no earlier than a public instant, with no trusted timestamp authority. Privacy: stamp an opaque sha256 digest.

Open interactive test console

Offering

Provider: touchstone.locomot.io
Method: GET
Offering type: Api Endpoint
Transport type: http
Category: Security
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://touchstone.locomot.io/timestamp
MIME type: application/json
First seen: 2026-10-16T01:51:40.954Z
Last seen: 2026-11-05T06:16:16.288Z
Tags: None supplied

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.001 USDC
Atomic price: 1000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "payTo": "0xa3091005a76b1480F1897a9D0C2e1c55B7767674"
  }
]

Observed health

Status: Healthy
Latest latency: 277 ms
Average latency: 876 ms
HTTP status: 402
Last checked: 2026-11-05T06:16:16.282Z
Reachability: 100% over 15 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "GET",
        "HEAD",
        "DELETE"
      ]
    },
    "queryParams": {
      "type": "object",
      "properties": {
        "op": {
          "type": "string",
          "enum": [
            "stamp",
            "verify"
          ],
          "description": "operation; default stamp"
        },
        "data": {
          "type": "string",
          "description": "text to stamp (sha256'd)"
        },
        "hash": {
          "type": "string",
          "description": "OR a 64-hex sha256 digest (private)"
        },
        "round": {
          "type": "integer",
          "description": "pin a drand round; verify requires it"
        }
      }
    }
  },
  "required": [
    "type",
    "method"
  ],
  "additionalProperties": false
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "method": {
          "enum": [
            "GET",
            "HEAD",
            "DELETE"
          ],
          "type": "string"
        },
        "queryParams": {
          "properties": {
            "data": {
              "description": "text to stamp (sha256'd)",
              "type": "string"
            },
            "hash": {
              "description": "OR a 64-hex sha256 digest (private)",
              "type": "string"
            },
            "op": {
              "description": "operation; default stamp",
              "enum": [
                "stamp",
                "verify"
              ],
              "type": "string"
            },
            "round": {
              "description": "pin a drand round; verify requires it",
              "type": "integer"
            }
          },
          "type": "object"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method"
      ],
      "type": "object"
    },
    "output": {
      "properties": {
        "beacon": {
          "type": "object"
        },
        "claim": {
          "type": "string"
        },
        "commitment": {
          "type": "string"
        },
        "deterministic_given_round": {
          "type": "boolean"
        },
        "digest": {
          "type": "string"
        },
        "digest_source": {
          "type": "string"
        },
        "engine": {
          "type": "string"
        },
        "not_earlier_than": {
          "type": "string"
        },
        "op": {
          "type": "string"
        },
        "proof": {
          "type": "object"
        },
        "round": {
          "type": "integer"
        },
        "round_time_utc": {
          "type": "string"
        }
      },
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}