# Provably-Fair Round Commit Hash

> Provably-Fair Round Commit Hash is a paid API for AI agents from pyfile-agent.taile3ff35.ts.net, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

Returns the SHA-256 hash of the server seed for a given round before any draw occurs, enabling provably-fair verification of random selection.

## Facts

- Endpoint: GET https://pyfile-agent.taile3ff35.ts.net/data/fair/commit
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/provably-fair-round-commit-hash-dc1bd411
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_gXf0RharTBDqnkkqAh0aD

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability provably-fair-round-commit-hash-dc1bd411
```

Example prompt: Before we run the draw for round 7, can you fetch the provably-fair commit hash for that round so participants can verify the server seed was locked in ahead of time?

## When to prefer this

Use this endpoint when you need to retrieve a cryptographic pre-commitment (SHA-256 of the server seed) for a specific round before or after a provably-fair draw occurs. It is the companion endpoint to the actual winner-selection endpoint on the same host — call this first to record the commit, then call the draw endpoint, then verify the revealed seed matches the commit.

## Known failure modes

- Missing or invalid round parameter returns an error or empty response
- Round ID that does not exist returns a not-found error
- Service unavailable returns a non-200 HTTP status
- Malformed round parameter (non-integer) may return a validation error

## How this service works

Provably-fair round commit: sha256(server_seed) before any draw. ?round=<id>

## Output

Returns the SHA-256 hash of the server seed that was committed before the specified round's draw, allowing participants to later verify that the seed was not altered after commitments were made.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   }
  },
  "output": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/provably-fair-round-commit-hash-dc1bd411/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pyfile-agent.taile3ff35.ts.net](https://www.zero.xyz/host/pyfile-agent.taile3ff35.ts.net/llms.txt)