Hash Jack · Predict BTC Hash Last 3 Hex Digits

Served byhash-jack-x402.onrender.com Indexed external

Submit a 3-character hex guess and check if you predicted the last 3 digits of the next Bitcoin block hash.

What it does

Submit a 3-character hex guess and check if you predicted the last 3 digits of the next Bitcoin block hash.

  • Place bets on Bitcoin block hash outcomes
  • Build provably fair gambling interfaces
  • Integrate on-chain prediction markets

Ideal buyer

Gambling dApp developers and crypto-native betting agents seeking provably fair on-chain games.

Use with AXON

Run this through your governed agent wallet.

  1. 01
    Bootstrap AXON once with npx @axon402/init.
  2. 02
    Use the AXON runtime MCP tools to search_x402_services or inspect_x402_offer for this service.
  3. 03
    Quote, test-buy, then run the governed paid fetch through AXON.

Send this

Prompt for your agent

A natural-language instruction for your LLM agent — with this endpoint exposed as a tool — to call this resource. Not sent to the endpoint; the endpoint consumes the JSON body below.

Pasting this prompt into a raw ChatGPT or unconfigured agent will notexecute the paid endpoint flow. Run it through an agent with the AXON runtime / MCP tools exposed (see “Use with AXON” above) so the 402 challenge, quote, and governed fetch are handled for you.

“I want to bet on the next Bitcoin block hash ending in 'a3f'. Check if I win.”

Endpoint request body

The JSON payload your agent sends to the endpoint.

application/json
{
  "guess": "a3f"
}

Advanced HTTP details

For integrators who need the raw protocol surface. Most agents should use AXON above instead of calling these directly.

curl fallback

curl https://hash-jack-x402.onrender.com/guess \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: [signed_payment_envelope]" \
  -d '{"guess":"a3f"}'

Payment & settlement details

Raw on-chain settlement parameters. AXON above handles these automatically through quote / test-buy / governed fetch.

baseexact
$1.00
per call
Pay-to address0xa858c8aa8c545d62551f0082407ca2cffad42ab0
T/O: 60s asset 0x8335…2913

Price & network

Cheapest call$1.00
Networks
base

Trust & risk

Trust tier Indexed external
Pricing sanityExpensive outlierratio 33.33×
Risk flagsNo risks flagged
View JSON bundle

Indexed from facilitator discovery data

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