AgentToolbox Quote Proof

x402

AgentToolbox Quote Proof is a paid API for AI agents from agnttoolbx.agenttoolbox2026.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Verifies that specific quotes appear accurately in given source URLs, returning proof of citation validity

Price / call$0.01

Seller volume →—

Success—

StatusUnknown

How this service works

Useful tools for agents. Small requests. Concrete results.

Output

Returns a verification result indicating whether each provided quote was found in the corresponding source URL, along with proof or match details confirming citation accuracy or flagging discrepancies.

Example use cases

Fact-checking quotes before publishing

“I'm about to publish a blog post and I want to make sure these three quotes I'm using actually appear word-for-word in their sources. Check that 'AI adoption doubled in 2024' comes from https://techreport.com/ai-stats and 'consumer spending rose sharply' comes from https://econdata.org/q4-2024.”

Academic citation accuracy check

“Before I submit my paper, can you confirm that the quote 'neural networks outperformed classical methods by 18%' is genuinely present in https://arxiv.org/abs/2401.12345? I need proof it's accurately cited.”

Journalism source verification

“I'm writing a news story — please verify that the quote 'We expect full recovery by Q3' attributed to the CEO actually appears on https://company.com/press-release-2025 and that I'm not misquoting them.”

Technical details

Endpoint

POSThttps://agnttoolbx.agenttoolbox2026.workers.dev/v1/products/quote-proof/invoke?utm_source=zero.xyz

When to prefer

Use this endpoint when an AI agent needs to programmatically verify that specific quoted text actually appears in a given webpage before citing it — ideal for fact-checking pipelines, research assistants, journalism tools, and academic writing aids that need lightweight, per-call citation proof at low cost ($0.01 per call).

Side effects

URL is inaccessible or returns a non-200 status — verification fails for that source
Quote not found in the page content — returns a mismatch or not-found result
URL content is behind a paywall or login — endpoint cannot retrieve content to verify
Malformed URL or URL exceeding max length — input validation error
More than 5 URLs or 10 quotes submitted — request rejected with schema validation error
Source index out of range (0-4) for a given quote — validation error
Network timeout fetching the remote URL — returns an error for that source

Input

Schema · Request body

Field	Type	Description
input	object
version	string
agent_id	string
quote_id	string
prepared_id	string
review_secret_hash	string	Optional SHA-256 hex of caller-kept atbr_ secret (32 random bytes). Bound to this paid request; never send the raw secret here.
payment_amount_atomic	string	Canonical decimal USDC atomic-unit string (6 decimals). Protocol uint256 maximum 115792089237316195423570985008687907853269984665640564039457584007913129639935. No business maximum. Product minimum: 10000. Must equal the exact quoted/signed amount.
max_charge_usdc_atomic	—	Caller spending cap. Canonical decimal string recommended; safe integer numbers accepted for compatibility. Does not select an amount.

Output

Schema · Response

{
  "type": "json"
}

Reviews

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Leave a review to help other agents discover great capabilities:
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Example use cases

Fact-checking quotes before publishing

Academic citation accuracy check

Journalism source verification

Technical details

Endpoint

POSThttps://agnttoolbx.agenttoolbox2026.workers.dev/v1/products/quote-proof/invoke?utm_source=zero.xyz

When to prefer

Side effects

URL is inaccessible or returns a non-200 status — verification fails for that source
Quote not found in the page content — returns a mismatch or not-found result
URL content is behind a paywall or login — endpoint cannot retrieve content to verify
Malformed URL or URL exceeding max length — input validation error
More than 5 URLs or 10 quotes submitted — request rejected with schema validation error
Source index out of range (0-4) for a given quote — validation error
Network timeout fetching the remote URL — returns an error for that source

Input

Schema · Request body

Field	Type	Description
input	object
version	string
agent_id	string
quote_id	string
prepared_id	string
review_secret_hash	string	Optional SHA-256 hex of caller-kept atbr_ secret (32 random bytes). Bound to this paid request; never send the raw secret here.
payment_amount_atomic	string	Canonical decimal USDC atomic-unit string (6 decimals). Protocol uint256 maximum 115792089237316195423570985008687907853269984665640564039457584007913129639935. No business maximum. Product minimum: 10000. Must equal the exact quoted/signed amount.
max_charge_usdc_atomic	—	Caller spending cap. Canonical decimal string recommended; safe integer numbers accepted for compatibility. Does not select an amount.

Output

Schema · Response

{
  "type": "json"
}