← The evidence ledger
Evidence row 293528
Observed , by probe.mcp/1.
- Kind
- mcp.tools
- About
- endpoint c81fcd5f-2788-4f3f-85cd-5fa3e64242ea
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 4bd341c603b984ebb2134606fd35d35ef59cdb094c942b50fe569c5cd76e7c99
- Leaf
- 0x33ebd5b84cdf9ea309a2e161a9d05e226e19af2f1cbf8b5d29a260fbd18a7392
What was observed
{
"count": 4,
"tools": [
{
"description": "Fact-check a whole answer: extracts every checkable claim and verifies each against Wikipedia, plus Wikidata structured facts for dates, numbers, quantities, ordinals and records. Returns per-claim verdict, confidence, quote, source URL, sentence span and suggested_correction (quoted only from cited sources when contradicted/outdated), plus an answer-level summary with overall_verdict, counts and problem_sentences. Abstained rather than guessed. Use to audit chatbot or RAG output. Price: $1.00 USDC on Base per call via x402; this MCP call returns payment instructions and POST /v1/check_answer returns the results. Read-only.",
"inputSchema": {
"additionalProperties": false,
"properties": {
"answer": {
"description": "The full answer text to fact-check. Each factual sentence is checked separately.",
"examples": [
"Marie Curie won two Nobel Prizes. She was born in Warsaw."
],
"minLength": 1,
"type": "string"
},
"sources": {
"description": "Optional. Up to 10 sources of your own, used as extra evidence next to the public sources and cited with provider and source_type \"caller\". The response lists what was used in sources_used.",
"items": {
"additionalProperties": false,
"anyOf": [
{
"required": [
"url"
]
},
{
"required": [
"text"
]
}
],
"description": "One source: {url} for a public https page we fetch, or {text, title?, url?} for text you already have.",
"properties": {
"text": {
"description": "Source text to check the claim against (up to 20,000 characters). When given, no fetch is made.",
"maxLength": 20000,
"minLength": 1,
"type": "string"
},
"title": {
"description": "Optional title shown in citations.",
"maxLength": 200,
"type": "string"
},
"url": {
"description": "Public https URL. Fetched with a 3.5 s timeout and a 512 KB cap; http, file and other schemes, private / loopback / link-local / metadata addresses, IP-literal hosts, custom ports and URLs with credentials are rejected (HTTP 400, not charged). With text, it is only the citation link.",
"format": "uri",
"maxLength": 2048,
"type": "string"
}
},
"type": "object"
},
"maxItems": 10,
"type": "array"
},
"sources_only": {
"default": false,
"description": "Optional. true = judge the claim only against your sources (no public-source lookups). Needs a non-empty sources array.",
"type": "boolean"
}
},
"required": [
"answer"
],
"type": "object"
},
"name": "check_answer"
},
{
"description": "Use when a claim is high-stakes, or when check_answer or extract_claims marks it unsure (their next_step gives the exact request). Verifies up to three claims against Wikipedia, Wikidata, Google News, Europe PMC, FRED and SEC EDGAR; returns verdict, confidence, evidence for and against with URLs, and flags contradictions. Async: poll GET /v1/jobs/{job_id} free. $0.75 USDC on Base via x402. Read-only.",
"inputSchema": {
"additionalProperties": false,
"properties": {
"answer": {
"description": "The claim or short text to verify (up to three claims are checked).",
"examples": [
"US unemployment was 3.7% in December 2023."
],
"minLength": 1,
"type": "string"
},
"sources": {
"description": "Optional. Up to 10 sources of your own, used as extra evidence next to the public sources and cited with provider and source_type \"caller\". The response lists what was used in sources_used.",
"items": {
"additionalProperties": false,
"anyOf": [
{
"required": [
"url"
]
},
{
"required": [
"text"
]
}
],
"description": "One source: {url} for a public https page we fetch, or {text, title?, url?} for text you already have.",
"properties": {
"text": {
"description": "Source text to check the claim against (up to 20,000 characters). When given, no fetch is made.",
"maxLength": 20000,
"minLength": 1,
"type": "string"
},
"title": {
"description": "Optional title shown in citations.",
"maxLength": 200,
"type": "string"
},
"url": {
"description": "Public https URL. Fetched with a 3.5 s timeout and a 512 KB cap; http, file and other schemes, private / loopback / link-local / metadata addresses, IP-literal hosts, custom ports and URLs with credentials are rejected (HTTP 400, not charged). With text, it is only the citation link.",
"format": "uri",
"maxLength": 2048,
"type": "string"
}
},
"type": "object"
},
"maxItems": 10,
"type": "array"
},
"sources_only": {
"default": false,
"description": "Optional. true = judge the claim only against your sources (no public-source lookups). Needs a non-empty sources array.",
"type": "boolean"
}
},
"required": [
"answer"
],
"type": "object"
},
"name": "deep_verify"
},
{
"description": "Split a text (for example an AI-generated answer) into atomic factual claims. Each claim includes span, grounding_required, claim_type (number|date|quantity|quote|named_entity_fact|comparison|opinion|prediction|other), check_worthiness (high|medium|low), and the source sentence. Hedges are stripped, pronouns are resolved across sentences, and compound sentences are split. Questions, greetings, opinions and predictions are marked grounding_required false. Use before verify_claim. Price: $0.05 USDC on Base per call via x402; this MCP call returns payment instructions and POST /v1/extract_claims returns the claims. Read-only.",
"inputSchema": {
"additionalProperties": false,
"properties": {
"text": {
"description": "The text to split into claims, for example a chatbot answer. Up to a few thousand characters.",
"examples": [
"The Eiffel Tower is in Paris and was completed in 1889."
],
"minLength": 1,
"type": "string"
}
},
"required": [
"text"
],
"type": "object"
},
"name": "extract_claims"
},
{
"description": "Check one factual claim against public Wikipedia sources and return a verdict (supported, contradicted, outdated, mixed or insufficient_evidence), a confidence score, a short reason, the supporting quote and the source URL. Says insufficient_evidence instead of guessing. Price: $1.00 USDC on Base per call via x402; this MCP call returns payment instructions and the paid HTTP route POST /v1/verify_claim returns the verdict. For a multi-source check use deep_verify. Read-only.",
"inputSchema": {
"additionalProperties": false,
"properties": {
"claim": {
"description": "One factual sentence to check.",
"examples": [
"The Eiffel Tower is in Paris."
],
"minLength": 1,
"type": "string"
},
"sources": {
"description": "Optional. Up to 10 sources of your own, used as extra evidence next to the public sources and cited with provider and source_type \"caller\". The response lists what was used in sources_used.",
"items": {
"additionalProperties": false,
"anyOf": [
{
"required": [
"url"
]
},
{
"required": [
"text"
]
}
],
"description": "One source: {url} for a public https page we fetch, or {text, title?, url?} for text you already have.",
"properties": {
"text": {
"description": "Source text to check the claim against (up to 20,000 characters). When given, no fetch is made.",
"maxLength": 20000,
"minLength": 1,
"type": "string"
},
"title": {
"description": "Optional title shown in citations.",
"maxLength": 200,
"type": "string"
},
"url": {
"description": "Public https URL. Fetched with a 3.5 s timeout and a 512 KB cap; http, file and other schemes, private / loopback / link-local / metadata addresses, IP-literal hosts, custom ports and URLs with credentials are rejected (HTTP 400, not charged). With text, it is only the citation link.",
"format": "uri",
"maxLength": 2048,
"type": "string"
}
},
"type": "object"
},
"maxItems": 10,
"type": "array"
},
"sources_only": {
"default": false,
"description": "Optional. true = judge the claim only against your sources (no public-source lookups). Needs a non-empty sources array.",
"type": "boolean"
}
},
"required": [
"claim"
],
"type": "object"
},
"name": "verify_claim"
}
]
}What the leaf hashes
{"body":"4bd341c603b984ebb2134606fd35d35ef59cdb094c942b50fe569c5cd76e7c99","id":293528,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793049447375308,"prev":null,"subject":"c81fcd5f-2788-4f3f-85cd-5fa3e64242ea","subject_kind":"endpoint"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (296695 rows).
- 0x33ebcf99cd5ef91667e7a98ce9182ad0b9c0919e2cb023769277ca5829dc441e
- 0xec9705cd8876bd2a19ad69f209cef9cf802b723e04d5b3928e0615d52826e82c
- 0x8a35e4a45a65faad5201749c52f458aef151115fb8b33fd515a39f35434ea7e7
- 0x6957cedea7eb9be649e3003e542d61205c0fe6bcf7b01cd5465f86b35b6a442b
- 0xfd875c77bd48bf2a0a3c71613e15751aaa1b08198f027bed4490e86b33aab55b
- 0x3c8a3f393f8b716996376f8ccdeb346e8786fbff897fe5f2dee3ce9064864131
- 0xd230429f5e9401f358071a63c4b2a85b724a5e0dc0710fd99f4950e68ddcfe49
- 0x0ba3b8298e36c394c6af1878cdc52cacb0867e6403435877a39bd328c8b0eaae
- 0xdc523b9e61ffd244a497361cd5402a75eaf83c7e318d79293ad63bd6bc9f06a6
- 0xcc3de2228ca9f90722824aeb1f6740dce363ec54f1223a4bfc96d012376efbc0
- 0x25f1494b636c5e3c47bd014c16b8f4b5df5a8fb62efdc32979420416a8736679
- 0xe57be1a98d96d75db9e9d2122794eabebfd735dea66e9d16ca63347243b3d483
- 0x08de74b7fb265ddb83e4c673da8a94e5f71829b2e6e7464c71c5138e450f2217
- 0x4338355a835617a26aa0bfcc971e84eb030d84e2aa840e3c8af958921dd080c7
- 0x610738e0c43687aded83c613c73de8b5226c73c375858a167436461c522ea213
- 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
- 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
- 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae