Verify an SEC 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.
Not tested: has real-world effectsour last check, 2026-09-24
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Endpoint
POST https://goodsong.dev/verify/filing
| Category | Everything else |
|---|---|
| Provider host | goodsong.dev |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"accession_number": "0000320193-23-000106",
"cik": "320193"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$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"
}