Prediction Evidence Invoke

{
  "capabilityId": "prediction.evidence",
  "capabilityVersion": "1.0.0",
  "invocationId": "uuid",
  "pricing": {
    "currency": "USDC",
    "pricePaidUsd": 0.05
  },
  "receiptUrl": "/api/v1/receipts/uuid",
  "result": {
    "agentNote": "This prediction evidence artifact is deterministically hashed and cached.",
    "contradictions": [],
    "evidence": [
      {
        "claim": "Ethereum Execution Specs and Consensus Specs schedule Pectra upgrade.",
        "confidence": 0.95,
        "direction": "supports",
        "observedAt": "2026-09-18T10:00:00.000Z",
        "source": "Ethereum Foundation EIP Repository & Execution-Specs GitHub",
        "sourceUrl": "https://github.com/ethereum/execution-specs",
        "verificationType": "primary_doc"
      }
    ],
    "executionCostUsd": 0.003,
    "limitations": [
      "Provides machine-readable verifiable evidence with provenance. Does not place bets or give financial advice."
    ],
    "market": "polymarket",
    "observedAt": "2026-09-18T10:00:00.000Z",
    "question": "Will Ethereum Pectra upgrade activate on mainnet before Q4 2026?",
    "receipt": {
      "capabilityVersion": "1.0.0",
      "createdAt": "2026-09-18T10:00:00.000Z",
      "evidenceDigest": "0xabcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890",
      "hash": "0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef",
      "id": "rcpt_pe_1234567890abcdef",
      "observedAt": "2026-09-18T10:00:00.000Z",
      "question": "Will Ethereum Pectra upgrade activate on mainnet before Q4 2026?"
    },
    "summary": "Audited proposition. Gathered sourced evidence with verifiable provenance.",
    "verdict": "allow"
  },
  "verdict": "allow"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://www.tereno.xyz/api/v1/capabilities/prediction.evidence/invoke' \
  -H 'content-type: application/json' \
  --data-raw '{"market":"polymarket","question":"Will Ethereum Pectra upgrade activate on mainnet before Q4 2026?"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://www.tereno.xyz/api/v1/capabilities/prediction.evidence/invoke' \
  -H 'content-type: application/json' \
  --data-raw '{"market":"polymarket","question":"Will Ethereum Pectra upgrade activate on mainnet before Q4 2026?"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.tereno.xyz%2Fapi%2Fv1%2Fcapabilities%2Fprediction.evidence%2Finvoke&method=POST
const res = await pay("https://www.tereno.xyz/api/v1/capabilities/prediction.evidence/invoke", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "market": "polymarket",
    "question": "Will Ethereum Pectra upgrade activate on mainnet before Q4 2026?"
  }),
});
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://www.tereno.xyz/api/v1/capabilities/prediction.evidence/invoke",
        json={
            "market": "polymarket",
            "question": "Will Ethereum Pectra upgrade activate on mainnet before Q4 2026?",
        },
    )
    print(res.status_code, res.text)