Citations Check Source Overlap

{
  "citation_link_candidates": [
    {
      "from_id": "a",
      "locations": [
        {
          "anchor_text": "Source",
          "column": 0,
          "line": 1,
          "target_url": "https://b.test/"
        }
      ],
      "status": "citation_link_candidate",
      "to_id": "b"
    }
  ],
  "coverage": {
    "citation_count": 2,
    "html_document_count": 1
  },
  "independence": "unknown",
  "limitations": [
    "Citation overlap is a candidate, not proof of dependence."
  ],
  "schema_version": "1",
  "service": "citation-overlap-checker",
  "shared_link_candidates": [],
  "shared_origin_groups": [],
  "supplied_lineage_links": [],
  "unresolved_citation_ids": [
    "a",
    "b"
  ]
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.mekler.ai/v1/research/citations/check-source-overlap' \
  -H 'content-type: application/json' \
  --data-raw '{"citations":[{"html":"<a href=\"https://b.test\">Source<\/a>","id":"a","url":"https://a.test"},{"id":"b","url":"https://b.test"}],"claim":"Reported benefit"}'

# 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://api.mekler.ai/v1/research/citations/check-source-overlap' \
  -H 'content-type: application/json' \
  --data-raw '{"citations":[{"html":"<a href=\"https://b.test\">Source<\/a>","id":"a","url":"https://a.test"},{"id":"b","url":"https://b.test"}],"claim":"Reported benefit"}' \
  | 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%2Fapi.mekler.ai%2Fv1%2Fresearch%2Fcitations%2Fcheck-source-overlap&method=POST
const res = await pay("https://api.mekler.ai/v1/research/citations/check-source-overlap", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "citations": [
      {
        "html": "<a href=\"https://b.test\">Source<\/a>",
        "id": "a",
        "url": "https://a.test"
      },
      {
        "id": "b",
        "url": "https://b.test"
      }
    ],
    "claim": "Reported benefit"
  }),
});
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://api.mekler.ai/v1/research/citations/check-source-overlap",
        json={
            "citations": [
                {
                    "html": "<a href=\"https://b.test\">Source</a>",
                    "id": "a",
                    "url": "https://a.test",
                },
                {
                    "id": "b",
                    "url": "https://b.test",
                },
            ],
            "claim": "Reported benefit",
        },
    )
    print(res.status_code, res.text)