Plainchain Fortune — Verifiable On-Chain Random Fortune

x402

Plainchain Fortune — Verifiable On-Chain Random Fortune is a paid API for AI agents from plainchain.appin60.com, paid per call via x402, $0.001042/call, status unknown (last checked 2026-10-14).

Returns a verifiably random fortune string selected by hashing the latest block on Base, providing tamper-resistant randomness anchored to blockchain state.

Price / call$0.001042

Seller volume →—

Success—

StatusUnknown

How this service works

Gas, balances, token data, address type, approvals, transaction decoding, x402 receipt verification and verifiable randomness on Base, Arbitrum, Ethereum and Optimism. No API key: pay $0.001-$0.01 per call in USDC on Base via x402.

Output

Returns a JSON object containing: the fortune string, the total count of available fortunes, the Base block number used, the chain name, the index selected (blockHash mod count), and a plain-English description of how the index was picked (e.g. 'index = blockHash mod count').

Example use cases

Agent decision tiebreaker with audit trail

“I need a provably fair coin-flip style decision for my agent — fetch a verifiable on-chain fortune from the latest Base block and tell me the fortune, block number, and how the index was picked so I can prove the choice wasn't manipulated.”

Daily on-chain fortune for a Web3 app

“Pull today's blockchain fortune from Base for my dapp's daily message — I want the fortune string, which block it came from, and the selection method so my users can verify it's random.”

Random seed for a game round

“My agent needs a tamper-proof random selection for this game round — get a fortune from Plainchain on Base and return the fortune text, block hash index, and block number so players can audit the randomness.”

Technical details

Endpoint

GEThttps://plainchain.appin60.com/v1/fortune?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need verifiable, tamper-resistant randomness anchored to a real blockchain block hash — not pseudo-random numbers from a software PRNG. It is ideal for agents that need an auditable random result (e.g. games, lotteries, or fair selection) on Base with a sub-cent pay-per-call cost and no API key required.

Side effects

Payment failure if USDC balance on Base is insufficient (x402 payment required)
Network or RPC error retrieving the latest block from Base
Stale or unavailable block data causing a timeout
Invalid or malformed response if the upstream chain node is unreachable

Input

Schema · Request body

Field	Type	Description
required	string
properties	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "of": 32,
    "block": 36581662,
    "chain": "Base",
    "index": 19,
    "fortune": "Simulate first. Sign second.",
    "howPicked": "index = blockHash mod count"
  }
}

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