$ man citation-verify
/citation-verify(1)
PRICE / CALL
$0.01
USDC · base mainnet · scheme: exact
METHOD
POST
CLUSTER
wordmintCATEGORY
uncategorized
STATUS
● live
NAME
citation-verify — citation verifier / fact-check against url / does-this-source-support-this-claim / hallucination detector
SYNOPSIS
POST https://x402.org/v1/citation-verify
Content-Type: application/json
X-PAYMENT: <signed-transferWithAuthorization>
{ ... }↳ first call →
402 Payment Required. Sign USDCtransferWithAuthorization, retry with theX-PAYMENT header.DESCRIPTION
Citation verifier / fact-check against URL / does-this-source-support-this-claim / hallucination detector. Fetches a source URL (HTML stripped, 100KB cap), and asks Venice claude-sonnet-4-6 whether a given claim is supported, contradicted, or absent. Returns verdict, confidence (0-1), and the strongest evidence quote when available.
INPUT — request schema
| property | type | description | req? |
|---|---|---|---|
| claim | string | The claim to verify. | required |
| source_url | string | Public http(s) URL of the source to check against. Up to 100KB read. | required |
OUTPUT — response shape
| field | type | description |
|---|---|---|
| claim | string | Echoes the claim text that was checked against the source. |
| source_url | string | URL of the page that was fetched and used as evidence. |
| source_chars | string | Character count of the stripped HTML text passed to the model. |
| source_bytes_total | string | Total bytes downloaded from the source URL before the 100KB cap was applied. |
| truncated | string | True when the fetched source exceeded the 100KB cap and was cut off. |
| verdict | string | One of supported, contradicted, or absent based on what the source says about the claim. |
| confidence | string | Model's confidence in the verdict on a 0 to 1 scale. |
| evidence_quote | string | Strongest verbatim quote from the source that backs the verdict, or empty if none found. |
| model | string | Identifier of the Venice model used, typically claude-sonnet-4-6. |
| source | string | Upstream provider tag, set to venice for this endpoint. |
EXAMPLES — two ways to call
EXAMPLE 1 · curl
curl -X POST https://x402.org/v1/citation-verify \
-H 'Content-Type: application/json' \
-d '{ }'first response =
402 Payment Required with payment requirements; sign + retry with X-PAYMENT.EXAMPLE 2 · mcp
# install once claude mcp add x402 --command "npx x402-deployer-mcp" # then ask Claude Code: # "use the citation-verify tool to ..."
MCP server handles payment automatically — your coding agent just calls the tool by name.
METADATA
- tags
- wordmintfact-checkcitation-verificationhallucination-detectorclaim-verificationsource-groundingevidence-extraction
- methods
- POST
- cluster
- wordmint
- price
- $0.01 USDC per call
ADJACENT — other endpoints in wordmint
| endpoint | description | price |
|---|---|---|
| ai-to-human-text | AI text humanizer / GPT detector bypass. | $0.01 |
| commit-message-from-diff | Git commit message generator / Conventional Commits / AI commit-msg. | $0.01 |
| humanize | AI text humanizer / GPT detector bypass. | $0.01 |
| regex-from-prompt | Regex generator / NL to regex / pattern builder. | $0.01 |
| sentiment | Sentiment + emotion analyzer. | $0.01 |
| sentiment-analysis | Sentiment analyzer / emotion classifier / aspect-based sentiment. | $0.01 |
| structured-extract | Structured-data extractor / JSON-from-text / schema-guided extraction / key-value pull / form-filler. | $0.01 |
| summarize | AI summarizer / TLDR generator. | $0.01 |
SEE ALSO