ToolVet
80trust / 100

Pdf Answer

by clink-lithium-vault.fly.dev in Documents & files

x402 APIPassing, checked 3 h ago

Ask a question about any public PDF and get a cited answer - pass a PDF URL and a plain-language question; returns the answer, confidence, verbatim supporting quotes with page numbers, or not_found. PDF question answering, document QA, read a filing/paper/manual/contract for me, extract a fact from a PDF. Text-based PDFs up to 25MB (no OCR). Full text instead: /pdf/text $0.01.

POST https://clink-lithium-vault.fly.dev/pdf/answer

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
286 ms typical, 409 ms slowest 5%
Last check
3 h ago
Next check
any minute now

How to call it

POST https://clink-lithium-vault.fly.dev/pdf/answer

Each call costs $0.05 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://clink-lithium-vault.fly.dev/pdf/answer
content-type: application/json

{
  "question": "What problem does the paper say proof-of-work solves?",
  "url": "https://bitcoin.org/bitcoin.pdf"
}

Parameters

ParameterTypeRequiredDescription
questionstringYes3-500 char plain-language question about the document
urlstringYesPublic http(s) URL of a PDF file

Example response

The provider's example. We can't check it without paying.

{
  "answer": "...",
  "citations": [
    {
      "page": 3,
      "quote": "..."
    }
  ],
  "confidence": "high",
  "not_found": false
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.05.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://clink-lithium-vault.fly.dev/pdf/answer' \
  -H 'content-type: application/json' \
  --data-raw '{"question":"What problem does the paper say proof-of-work solves?","url":"https://bitcoin.org/bitcoin.pdf"}'

# 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://clink-lithium-vault.fly.dev/pdf/answer' \
  -H 'content-type: application/json' \
  --data-raw '{"question":"What problem does the paper say proof-of-work solves?","url":"https://bitcoin.org/bitcoin.pdf"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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%2Fclink-lithium-vault.fly.dev%2Fpdf%2Fanswer&method=POST
const res = await pay("https://clink-lithium-vault.fly.dev/pdf/answer", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "question": "What problem does the paper say proof-of-work solves?",
    "url": "https://bitcoin.org/bitcoin.pdf"
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# 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://clink-lithium-vault.fly.dev/pdf/answer",
        json={
            "question": "What problem does the paper say proof-of-work solves?",
            "url": "https://bitcoin.org/bitcoin.pdf",
        },
    )
    print(res.status_code, res.text)

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

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