← The evidence ledger
Evidence row 560
Observed , by baseline/1.
- Kind
- listing
- About
- source_record agentic_market:agents-factstamp-dev
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 37079277d90853c811da3937238d415aae6ba2c40cbafe8d7ac4aeb1870b93d4
- Leaf
- 0xce6ffb98440aa5c8addf04434c358536f06b191009eafd3abc2de156b5ef9a20
What was observed
{
"endpoints": [
[
"x402",
"https://agents.factstamp.dev/bulk"
],
[
"x402",
"https://agents.factstamp.dev/ca/entity-file"
],
[
"x402",
"https://agents.factstamp.dev/check"
],
[
"x402",
"https://agents.factstamp.dev/citation"
],
[
"x402",
"https://agents.factstamp.dev/document"
],
[
"x402",
"https://agents.factstamp.dev/entity"
],
[
"x402",
"https://agents.factstamp.dev/entity-file"
],
[
"x402",
"https://agents.factstamp.dev/il/entity-file"
],
[
"x402",
"https://agents.factstamp.dev/package"
],
[
"x402",
"https://agents.factstamp.dev/probe"
],
[
"x402",
"https://agents.factstamp.dev/sanctions"
],
[
"x402",
"https://agents.factstamp.dev/vat"
],
[
"x402",
"https://agents.factstamp.dev/watch"
]
],
"name": "agents.factstamp.dev",
"owner_address": null,
"raw": {
"caip2_networks": [
"eip155:8453"
],
"category": "",
"description": "",
"domain": "agents.factstamp.dev",
"endpoints": [
{
"description": "A whole bibliography or dependency manifest in one round trip, at the point of relying on the list: up to 12 items at a flat US$0.12 — 1 cent an item, against 2 cents for the same lookups one at a time. Every item is answered by the same door that answers a single call, so the verdicts cannot disagree. A list, not prose: a whole document belongs to /document. Pay per call here, or redeem a prepaid pack code (one answer-pack credit per three items, up to 25 items on that rail).",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": [],
"group": "body",
"name": "citations",
"required": false,
"type": "array"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": [],
"group": "body",
"name": "packages",
"required": false,
"type": "array"
}
],
"pricing": {
"amount": "0.12",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "1",
"l30DaysUniquePayers": "1"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/bulk"
},
{
"description": "Canadian company lookup and federal corporation register check by nine-digit Business Number (BN), when signing, onboarding or paying a counterparty: one corporation file in six sections, read live from Corporations Canada. Corporation number, BN, governing legislation, every registered name, status, registered address, the minimum and maximum NUMBER of directors rather than their names, and annual returns. Keyed by BN, so a name alone cannot reach it. Returns found, not_found or unknown.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "106679285",
"group": "body",
"name": "query",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.25",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "1",
"l30DaysUniquePayers": "1"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/ca/entity-file"
},
{
"description": "A fact check on a dated figure or statistic against the publisher's own series: verified, stale, contradicted or unknown, with the as-of date. Relevant wherever a number is going onto a page, deck, model or decision. Coverage today is Australian primary sources; anything outside coverage returns unknown rather than a guess.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "The RBA cash rate is 4.35% as at August 2026",
"group": "body",
"name": "claim",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.05",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "2"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/check"
},
{
"description": "Says whether a citation can be repeated. Give a DOI, an arXiv ID or a paper title; the answer says whether the work exists, what it is (title, authors, year, container) and whether it has been retracted. A title that is absent from both Crossref and arXiv returns not_found, and a near title match is never reported as verified. Cited to the source record with its retrieval time. Verdicts: verified, ambiguous, retracted, not_found, unknown.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "10.1038/nature12373",
"group": "body",
"name": "query",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.02",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "3"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/citation"
},
{
"description": "For a document that quotes figures, names companies or cites papers: post the text and every checkable claim comes back verified against dated primary sources, as one signed bundle with a per-claim receipt and its licence. Claims we cannot answer are named and never charged, and the preview is free. Verdicts: verified, stale, contradicted, unknown. Prose, not a list: a bare bibliography belongs to /bulk.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "The RBA cash rate was 4.35% as at August 2026. Shopify Inc. is registered in Canada. The method follows doi:10.1038/nature12373.",
"group": "body",
"name": "document",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.25",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "2",
"l30DaysUniquePayers": "1"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/document"
},
{
"description": "Company verification of a legal entity: whether it exists, is registered, and under which identifier — GLEIF, US SEC EDGAR, the Australian Business Register (ABN, ACN, GST, status), with an ASIC search by ACN or ABN. Relevant wherever a company is named in a contract, invoice or filing: an Australian company check, a company register check, an ABN lookup, or an ABN, ACN, LEI or CIK for a company known only by name. Returns found, ambiguous, not_found or unknown, cited with its retrieval time.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "Shopify Inc.",
"group": "body",
"name": "query",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.1",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "4",
"l30DaysUniquePayers": "2"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/entity"
},
{
"description": "One company in full at the point of signing, onboarding, paying or acquiring — a company check by company number or name across the company registers. Identity and standing, registered office, SIC and prior names, the filing position, a sanctions screen across six lists, plus the ownership the registers publish (persons with significant control where published; parent relationships where a company has an LEI; beneficial ownership not public in nearly every country we cover). Not a KYB provider.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "00445790",
"group": "body",
"name": "query",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.438119",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "2",
"l30DaysUniquePayers": "1"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/entity-file"
},
{
"description": "Israeli company lookup and register check by company number (nine digits, with its check digit) or by registered name, when signing, onboarding or paying a counterparty: one Israeli company file in seven sections, read live from the Registrar of Companies on data.gov.il. Identity, type, status, purpose, incorporation date, government-company flag, last annual-report year and registered address. No officers or shareholders as people; no financials. Returns found, ambiguous, not_found or unknown.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "516321486",
"group": "body",
"name": "query",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.3",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "1",
"l30DaysUniquePayers": "1"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/il/entity-file"
},
{
"description": "Reports on a dependency at the point of installation. Give a package and, optionally, a version with its ecosystem (npm, PyPI, crates.io); the answer says whether that exact version exists, whether it is yanked or deprecated, and every advisory OSV lists against it. A version that was never published returns not_found with the real versions nearest to it. Verdicts: verified, advisory, yanked, not_found, unknown.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "npm",
"group": "body",
"name": "ecosystem",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "express@4.18.2",
"group": "body",
"name": "package",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.02",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "3"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/package"
},
{
"description": "A two-cent probe of the FactStamp engine: one small claim in, one cited answer out, receipted. Send a dated figure, a company name, a DOI/arXiv id or a package@version and get the verdict, the value and the source it rests on with our retrieval time — the same engine and the same sources the full-price doors read. Unknown is a valid answer and nothing is invented. Paid per call in USDC on Base; no pack code and no free tier.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "Australia's cash rate target is 3.60%",
"group": "body",
"name": "claim",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "figure",
"group": "body",
"name": "kind",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.02",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "1",
"l30DaysUniquePayers": "1"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/probe"
},
{
"description": "Sanctions screening of a name against OFAC SDN and Non-SDN, the UN consolidated list, the EU Financial Sanctions File, the UK Sanctions List and Australia's DFAT list. Relevant before transacting with a party, and wherever a sanctions check must be evidenced. Returns listed, mismatch, not_found or unknown, with the matched entry's reference and each list's dates. A near name is never the same party; a list not consulted is named as not consulted. Not advice, not a legal determination.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "entity",
"group": "body",
"name": "kind",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "Banco Nacional de Cuba",
"group": "body",
"name": "name",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.05",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "2",
"l30DaysUniquePayers": "2"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/sanctions"
},
{
"description": "An EU VAT number check — VAT validity, and the VAT registration behind it. Relevant wherever a VAT number is being relied on or cited: the check reads the official VIES service (European Commission), keyless, and returns valid, invalid or unknown — an outage is never reported as invalid — with the member state, the register's own request date, and the trader identity only where that member state discloses it. GB is out of scope after Brexit; XI (Northern Ireland) is covered. Not tax advice.",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "IE",
"group": "body",
"name": "country_code",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "6388047V",
"group": "body",
"name": "vat_number",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.05",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "3",
"l30DaysUniquePayers": "3"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/vat"
},
{
"description": "A standing re-check of ONE citation or package version, for an answer that must stay true for a month rather than once: daily re-checks for 30 days. US$0.50 the month — 1.7 cents a check, under a 2-cent lookup. The first check is answered and signed on purchase, and each real change (a retraction, a new advisory, a yanked version) gets its own signed receipt. One subject only: for a list use /watch/portfolio. Pay per call here, or redeem a pack code (10 credits).",
"method": "POST",
"parameters": [
{
"default": null,
"description": "",
"enumValues": [],
"example": "citation",
"group": "body",
"name": "kind",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "10.1038/nature12373",
"group": "body",
"name": "subject",
"required": false,
"type": "string"
},
{
"default": null,
"description": "",
"enumValues": [],
"example": "https://example.com/factstamp/hook",
"group": "body",
"name": "webhook",
"required": false,
"type": "string"
}
],
"pricing": {
"amount": "0.5",
"currency": "USDC",
"maxAmount": "",
"minAmount": "",
"network": "eip155:8453",
"scheme": "exact"
},
"providerName": "",
"quality": {
"l30DaysTotalCalls": "1",
"l30DaysUniquePayers": "1"
},
"serviceName": "",
"tags": [],
"url": "https://agents.factstamp.dev/watch"
}
],
"enriched": false,
"iconUrl": "",
"id": "agents-factstamp-dev",
"integrationType": "",
"isNew": false,
"name": "agents.factstamp.dev",
"networks": [
"Base"
],
"priceSummary": {
"avgCostBasis": "exact",
"avgCostPerTransaction": "0.166778",
"currency": "USDC",
"maxAmount": "0.5",
"minAmount": "0.02"
},
"provider": "agents.factstamp.dev",
"providerUrl": "",
"serviceName": "",
"tags": []
},
"source": "agentic_market",
"summary": ""
}What the leaf hashes
{"body":"37079277d90853c811da3937238d415aae6ba2c40cbafe8d7ac4aeb1870b93d4","id":560,"kind":"listing","method":"baseline/1","observed_us":1793025224915255,"prev":null,"subject":"agentic_market:agents-factstamp-dev","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (296695 rows).
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- 0xefabf1105e09cf52c12c58e60cbb5048b9ac3f02631d1816a926e14bdd86fbdf
- 0xe94ca5b798e9899ad611e57835af42266e20f53f44977e487d81365e30972beb
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- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae