Verify an SEC filing: given a filer's CIK and a claimed accession number, does that filing
Verify an SEC filing: given a filer's CIK and a claimed accession number, does that filing actually exist, and does its form type/filing date match what's claimed? Checked against SEC EDGAR's submissions API. Catches a fabricated or misattributed filing citation, including a real-looking accession number paired with an invented form type or date.
5000 (raw units)
price
1
calls / 30d
1
unique payers
2026-09-04
updated
Provider
goodsong.dev · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0xf3b36a95913eb2676fcdedb2ba6b0c96ade58de1",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "5000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"body": {
"accession_number": "0000320193-23-000106",
"cik": "320193"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"canonical": {
"accession_number": "0000320193-23-000106",
"cik": "0000320193",
"company": "Apple Inc.",
"filing_date": "2023-11-03",
"form": "10-K",
"report_date": "2023-09-30"
},
"checks": {
"date_match": true,
"exists": true,
"form_match": true
},
"cost": {
"amount": "0.005",
"currency": "USDC"
},
"evidence": [
{
"retrieved_at": "2026-08-30T12:00:00Z",
"source": "sec_edgar",
"url": "https://data.sec.gov/submissions/CIK0000320193.json"
}
],
"latency_ms": 240,
"verdict": "confirmed"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"description": "Provide the filer's CIK and the filing's accession number; form_type and filed_date are optional and checked against the canonical record when given.",
"properties": {
"accession_number": {
"description": "The filing's SEC accession number, e.g. '0000320193-23-000106'.",
"type": "string"
},
"cik": {
"description": "The filer's SEC Central Index Key (CIK), e.g. '320193' or '0000320193'.",
"type": "string"
},
"filed_date": {
"description": "Optional expected filing date (YYYY-MM-DD) to cross-check.",
"type": "string"
},
"form_type": {
"description": "Optional expected form type, e.g. '10-K', '8-K', '4'.",
"type": "string"
}
},
"required": [
"cik",
"accession_number"
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"canonical": {
"type": [
"object",
"null"
]
},
"checks": {
"type": "object"
},
"cost": {
"type": "object"
},
"evidence": {
"type": "array"
},
"latency_ms": {
"type": "integer"
},
"verdict": {
"enum": [
"confirmed",
"contradicted",
"unknown"
],
"type": "string"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
curl
curl "https://goodsong.dev/verify/filing" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://goodsong.dev/verify/filing");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://goodsong.dev/verify/filing")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/7666.json, and this resource appears in /discovery/resources and /discovery/search.