Pay-per-call (x402 USDC on Base) tools: verify URLs, verify citations, find Wayback archives.
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For up to 10 URLs (e.g. dead links), find the closest Internet Archive Wayback Machine snapshot, optionally nearest a date (YYYY, YYYY-MM or YYYY-MM-DD). Returns snapshot URL, capture time, captured status. Price: 0.005 USDC per call (x402, Base).
Default target date
Pick your client. Values in capitals, like YOUR_TOKEN, are yours to fill in.
Run in a terminal
claude mcp add --transport http linkproof https://linkproof.bsptimber.workers.dev/mcp
For up to 10 URLs (e.g. dead links), find the closest Internet Archive Wayback Machine snapshot, optionally nearest a date (YYYY, YYYY-MM or YYYY-MM-DD). Returns snapshot URL, capture time, captured status. Price: 0.005 USDC per call (x402, Base).
| Argument | Type | Description |
|---|---|---|
| date | string | Default target date |
| urls* | array |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"urls"
],
"properties": {
"date": {
"type": "string",
"description": "Default target date"
},
"urls": {
"type": "array",
"items": {
"anyOf": [
{
"type": "string"
},
{
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string"
},
"date": {
"type": "string"
}
}
}
]
},
"maxItems": 10,
"minItems": 1
}
}
}Verify up to 10 citations really exist and match the claimed title/authors/year, against Crossref, DataCite, arXiv and PubMed. Items: DOI, arXiv id, 'PMID: 123', free-text reference, or {doi|arxiv|pmid|title, authors, year}. Verdicts: verified, mismatch, not_found, error. Price: 0.01 USDC per call (x402, Base).
| Argument | Type | Description |
|---|---|---|
| citations* | array |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"citations"
],
"properties": {
"citations": {
"type": "array",
"items": {
"anyOf": [
{
"type": "string",
"maxLength": 1000,
"minLength": 1
},
{
"type": "object",
"properties": {
"doi": {
"type": "string"
},
"pmid": {
"type": "string"
},
"year": {
"type": "integer",
"maximum": 9007199254740991,
"minimum": -9007199254740991
},
"arxiv": {
"type": "string"
},
"title": {
"type": "string",
"maxLength": 500
},
"authors": {
"type": "array",
"items": {
"type": "string"
},
"maxItems": 30
}
}
}
]
},
"maxItems": 10,
"minItems": 1
}
}
}Check up to 10 URLs before citing or sending them. Per URL: verdict (live, live_but_text_not_found, soft_404, parked, dead, blocked_or_rate_limited, unreachable), HTTP status, final URL, title, and optional check that an expected phrase appears. Price: 0.005 USDC per call (x402, Base).
| Argument | Type | Description |
|---|---|---|
| urls* | array | URL strings, or {url, expect} objects |
{
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"urls"
],
"properties": {
"urls": {
"type": "array",
"items": {
"anyOf": [
{
"type": "string"
},
{
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string"
},
"expect": {
"type": "string",
"maxLength": 300
}
}
}
]
},
"maxItems": 10,
"minItems": 1,
"description": "URL strings, or {url, expect} objects"
}
}
}We read every tool's name, description and inputs the way the model will, looking for instructions hidden from you. A clean result means no warning signs, not a guarantee. Scanned Nov 14, 2026.