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Evidence Extraction Consistency

by Extraction consistency in Search & web

x402 APIPassing, checked 5 h ago

Compare up to 64 total extracted spans from at most 16 labeled tools against exact code-point slices of supplied source text and declared UTF-8 hashes. Group identical source spans to expose text disagreements. No OCR/PDF execution, normalization, or completeness claim. New modular adapter: retained result recovery for 24 hours, minimal receipt metadata for 90 days. Existing live route unchanged.

POST https://www.mahastrategies.com/api/v1/verify/evidence/extraction-consistency

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
200 ms typical, 200 ms slowest 5%
Last check
5 h ago
Next check
in 1 h

How to call it

POST https://www.mahastrategies.com/api/v1/verify/evidence/extraction-consistency

Each call costs $0.010018 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://www.mahastrategies.com/api/v1/verify/evidence/extraction-consistency
content-type: application/json

{
  "dataClass": "synthetic",
  "extractions": [
    {
      "extractionId": "x1",
      "passages": [
        {
          "end": 5,
          "expectedHash": "sha256:185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969",
          "passageId": "p1",
          "start": 0,
          "text": "Hello"
        }
      ],
      "sourceId": "s1",
      "toolId": "tool-a"
    },
    {
      "extractionId": "x2",
      "passages": [
        {
          "end": 5,
          "expectedHash": "sha256:2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824",
          "passageId": "p2",
          "start": 0,
          "text": "hello"
        }
      ],
      "sourceId": "s1",
      "toolId": "tool-b"
    }
  ],
  "sources": [
    {
      "sourceId": "s1",
      "text": "Hello world."
    }
  ]
}

Parameters

ParameterTypeRequiredDescription
dataClassstringYes One of: public, synthetic.
extractionsarrayYes
sourcesarrayYes

Example response

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

Example response, 55 lines
{
  "data": {
    "chargedAmount": "10018",
    "inputHash": "sha256:67e30aa099dd018614d49f42ea0c1aaa7973468d6b6b963ea7637b6b1…",
    "limitations": [
      "Public or synthetic inputs only. Caller labels are declarations,…"
    ],
    "productId": "extraction-consistency",
    "result": {
      "allExact": false,
      "allHashesMatch": true,
      "checks": [
        {
          "contentSha256": "sha256:185f8db32271fe25f561a6fc938b2e264306ec304eda518007d176482…",
          "exactSourceMatch": true,
          "extractionId": "x1",
          "hashMatches": true,
          "passageId": "p1",
          "sourceId": "s1"
        }
      ],
      "conflictingSpanCount": 1,
      "dataClass": "synthetic",
      "inputSha256": "sha256:67e30aa099dd018614d49f42ea0c1aaa7973468d6b6b963ea7637b6b1…",
      "limits": [
        "Public/synthetic is a caller declaration, not content inspection…"
      ],
      "resultSha256": "sha256:f6383c54de1b6afdb42b0181378caeca11e59ed5409e8eb41d4690af2…",
      "sourcesVerified": false,
      "spans": [
        {
          "allExact": false,
          "consistentText": false,
          "contentHashes": [
            "sha256:185f8db32271fe25f561a6fc938b2e264306ec304eda518007d176482…"
          ],
          "end": 5,
          "extractionIds": [
            "x1",
            "x2"
          ],
          "sourceId": "s1",
          "start": 0
        }
      ]
    },
    "resultHash": "sha256:e77008d8a12a81767e7bc780519768278096f439af3b336b5f2666594…",
    "sourceContractAmount": "46500",
    "version": "maha-legacy-adapter/1"
  },
  "proof": {
    "settlement_id": "0x00000000000000000000000000000000000000000000000000000000000000…"
  },
  "success": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.010018.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://www.mahastrategies.com/api/v1/verify/evidence/extraction-consistency' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","extractions":[{"extractionId":"x1","passages":[{"end":5,"expectedHash":"sha256:185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969","passageId":"p1","start":0,"text":"Hello"}],"sourceId":"s1","toolId":"tool-a"},{"extractionId":"x2","passages":[{"end":5,"expectedHash":"sha256:2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824","passageId":"p2","start":0,"text":"hello"}],"sourceId":"s1","toolId":"tool-b"}],"sources":[{"sourceId":"s1","text":"Hello world."}]}'

# 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.mahastrategies.com/api/v1/verify/evidence/extraction-consistency' \
  -H 'content-type: application/json' \
  --data-raw '{"dataClass":"synthetic","extractions":[{"extractionId":"x1","passages":[{"end":5,"expectedHash":"sha256:185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969","passageId":"p1","start":0,"text":"Hello"}],"sourceId":"s1","toolId":"tool-a"},{"extractionId":"x2","passages":[{"end":5,"expectedHash":"sha256:2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824","passageId":"p2","start":0,"text":"hello"}],"sourceId":"s1","toolId":"tool-b"}],"sources":[{"sourceId":"s1","text":"Hello world."}]}' \
  | 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 $0.010018 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.010018" });
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 $0.010018 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fwww.mahastrategies.com%2Fapi%2Fv1%2Fverify%2Fevidence%2Fextraction-consistency&method=POST
const res = await pay("https://www.mahastrategies.com/api/v1/verify/evidence/extraction-consistency", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "dataClass": "synthetic",
    "extractions": [
      {
        "extractionId": "x1",
        "passages": [
          {
            "end": 5,
            "expectedHash": "sha256:185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969",
            "passageId": "p1",
            "start": 0,
            "text": "Hello"
          }
        ],
        "sourceId": "s1",
        "toolId": "tool-a"
      },
      {
        "extractionId": "x2",
        "passages": [
          {
            "end": 5,
            "expectedHash": "sha256:2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824",
            "passageId": "p2",
            "start": 0,
            "text": "hello"
          }
        ],
        "sourceId": "s1",
        "toolId": "tool-b"
      }
    ],
    "sources": [
      {
        "sourceId": "s1",
        "text": "Hello world."
      }
    ]
  }),
});
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 $0.010018 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.010018"})
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.mahastrategies.com/api/v1/verify/evidence/extraction-consistency",
        json={
            "dataClass": "synthetic",
            "extractions": [
                {
                    "extractionId": "x1",
                    "passages": [
                        {
                            "end": 5,
                            "expectedHash": "sha256:185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969",
                            "passageId": "p1",
                            "start": 0,
                            "text": "Hello",
                        },
                    ],
                    "sourceId": "s1",
                    "toolId": "tool-a",
                },
                {
                    "extractionId": "x2",
                    "passages": [
                        {
                            "end": 5,
                            "expectedHash": "sha256:2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824",
                            "passageId": "p2",
                            "start": 0,
                            "text": "hello",
                        },
                    ],
                    "sourceId": "s1",
                    "toolId": "tool-b",
                },
            ],
            "sources": [
                {
                    "sourceId": "s1",
                    "text": "Hello world.",
                },
            ],
        },
    )
    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

WhenResultHTTPTimePrice
5 h agoPassed402200 ms$0.01