Use this service when you need this capability: audits bounded HTML or Markdown heading hierarchy, duplicates, IDs, skipped levels, and empty headings deterministically.
0.005 USDC per call
x402 V2 exact payment on Base mainnet (eip155:8453) using USDC. The HTTP 402 challenge confirms the exact requirements before an authorized payment.
POST https://signalharness.ai/api/agent/services/heading_structure_audit/invokeAudits bounded HTML or Markdown heading hierarchy, duplicates, IDs, skipped levels, and empty headings deterministically.
This service applies bounded processing to the supplied input. Review its schema, result fields, and limits for the exact supported capability.
| Field | Type | Required | Limits |
|---|---|---|---|
| html | string | Optional | Minimum length 1; Maximum length 65536 |
| markdown | string | Optional | Minimum length 1; Maximum length 65536 |
{
"markdown": "# Example\n\n### Detail"
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 1,
"maxProperties": 1,
"required": [],
"properties": {
"html": {
"type": "string",
"minLength": 1,
"maxLength": 65536
},
"markdown": {
"type": "string",
"minLength": 1,
"maxLength": 65536
}
}
}Illustrative output from the canonical adapter fixture and schema. It is not a completed paid execution or a current live observation.
{
"format": "html",
"status": "pass",
"outline": [
{
"level": 1,
"text": "Example caller-supplied content.",
"id": "example",
"ordinal": 0
}
],
"findings": [
{
"code": "empty_heading",
"severity": "warn",
"ordinal": 0
}
],
"summary": {
"headingCount": 0,
"h1Count": 0,
"failCount": 0,
"warnCount": 0
}
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 5,
"maxProperties": 5,
"required": [
"format",
"status",
"outline",
"findings",
"summary"
],
"properties": {
"format": {
"type": "string",
"enum": [
"html",
"markdown"
],
"minLength": 4,
"maxLength": 8
},
"status": {
"type": "string",
"enum": [
"pass",
"warn",
"fail"
],
"minLength": 4,
"maxLength": 4
},
"outline": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "object",
"additionalProperties": false,
"minProperties": 4,
"maxProperties": 4,
"required": [
"level",
"text",
"id",
"ordinal"
],
"properties": {
"level": {
"type": "integer",
"minimum": 1,
"maximum": 6
},
"text": {
"type": "string",
"minLength": 0,
"maxLength": 8192
},
"id": {
"type": "string",
"minLength": 0,
"maxLength": 256
},
"ordinal": {
"type": "integer",
"minimum": 0,
"maximum": 255
}
}
}
},
"findings": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "object",
"additionalProperties": false,
"minProperties": 3,
"maxProperties": 3,
"required": [
"code",
"severity",
"ordinal"
],
"properties": {
"code": {
"type": "string",
"enum": [
"empty_heading",
"skipped_level",
"duplicate_id",
"duplicate_heading"
],
"minLength": 11,
"maxLength": 17
},
"severity": {
"type": "string",
"enum": [
"warn",
"fail"
],
"minLength": 4,
"maxLength": 4
},
"ordinal": {
"type": "integer",
"minimum": 0,
"maximum": 255
}
}
}
},
"summary": {
"type": "object",
"additionalProperties": false,
"minProperties": 4,
"maxProperties": 4,
"required": [
"headingCount",
"h1Count",
"failCount",
"warnCount"
],
"properties": {
"headingCount": {
"type": "integer",
"minimum": 0,
"maximum": 256
},
"h1Count": {
"type": "integer",
"minimum": 0,
"maximum": 256
},
"failCount": {
"type": "integer",
"minimum": 0,
"maximum": 256
},
"warnCount": {
"type": "integer",
"minimum": 0,
"maximum": 256
}
}
}
}
}Timeout: 5000 ms. Full schemas are in OpenAPI.
This schema-valid request returns the canonical HTTP 402 challenge without executing the service. A payment-capable client validates the challenge, signs only with prior authority and budget, and retries the identical body.
curl -i -X POST https://signalharness.ai/api/agent/services/heading_structure_audit/invoke \
-H "Content-Type: application/json" \
--data '{"markdown":"# Example\n\n### Detail"}'