Use this service when you need this capability: compares text or Markdown by deterministic heading-aware sections without semantic inference or an LLM.
0.02 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/document_diff/invokeCompares text or Markdown by deterministic heading-aware sections without semantic inference or an LLM.
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 |
|---|---|---|---|
| before | string | Required | Minimum length 0; Maximum length 65536 |
| after | string | Required | Minimum length 0; Maximum length 65536 |
{
"before": "# Before",
"after": "# After"
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 2,
"maxProperties": 2,
"required": [
"before",
"after"
],
"properties": {
"before": {
"type": "string",
"minLength": 0,
"maxLength": 65536
},
"after": {
"type": "string",
"minLength": 0,
"maxLength": 65536
}
}
}Illustrative output from the canonical adapter fixture and schema. It is not a completed paid execution or a current live observation.
{
"beforeHash": "0000000000000000000000000000000000000000000000000000000000000000",
"afterHash": "0000000000000000000000000000000000000000000000000000000000000000",
"beforeLineCount": 0,
"afterLineCount": 0,
"beforeSectionCount": 0,
"afterSectionCount": 0,
"addedSections": [
{
"heading": "example",
"text": "Example caller-supplied content.",
"hash": "example000000000000000000000000000000000000000000000000000000000",
"lineCount": 0
}
],
"removedSections": [
{
"heading": "example",
"text": "Example caller-supplied content.",
"hash": "example000000000000000000000000000000000000000000000000000000000",
"lineCount": 0
}
],
"changedSections": [
{
"heading": "example",
"beforeHash": "example000000000000000000000000000000000000000000000000000000000",
"afterHash": "example000000000000000000000000000000000000000000000000000000000",
"beforeText": "example",
"afterText": "example"
}
],
"summary": {
"added": 0,
"removed": 0,
"changed": 0
}
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 10,
"maxProperties": 10,
"required": [
"beforeHash",
"afterHash",
"beforeLineCount",
"afterLineCount",
"beforeSectionCount",
"afterSectionCount",
"addedSections",
"removedSections",
"changedSections",
"summary"
],
"properties": {
"beforeHash": {
"type": "string",
"pattern": "^[0-9a-f]{64}$",
"minLength": 64,
"maxLength": 64
},
"afterHash": {
"type": "string",
"pattern": "^[0-9a-f]{64}$",
"minLength": 64,
"maxLength": 64
},
"beforeLineCount": {
"type": "integer",
"minimum": 0,
"maximum": 100000
},
"afterLineCount": {
"type": "integer",
"minimum": 0,
"maximum": 100000
},
"beforeSectionCount": {
"type": "integer",
"minimum": 0,
"maximum": 2000
},
"afterSectionCount": {
"type": "integer",
"minimum": 0,
"maximum": 2000
},
"addedSections": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "object",
"additionalProperties": false,
"minProperties": 4,
"maxProperties": 4,
"required": [
"heading",
"text",
"hash",
"lineCount"
],
"properties": {
"heading": {
"type": "string",
"minLength": 1,
"maxLength": 8192
},
"text": {
"type": "string",
"minLength": 0,
"maxLength": 65536
},
"hash": {
"type": "string",
"minLength": 64,
"maxLength": 64
},
"lineCount": {
"type": "integer",
"minimum": 0,
"maximum": 100000
}
}
}
},
"removedSections": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "object",
"additionalProperties": false,
"minProperties": 4,
"maxProperties": 4,
"required": [
"heading",
"text",
"hash",
"lineCount"
],
"properties": {
"heading": {
"type": "string",
"minLength": 1,
"maxLength": 8192
},
"text": {
"type": "string",
"minLength": 0,
"maxLength": 65536
},
"hash": {
"type": "string",
"minLength": 64,
"maxLength": 64
},
"lineCount": {
"type": "integer",
"minimum": 0,
"maximum": 100000
}
}
}
},
"changedSections": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "object",
"additionalProperties": false,
"minProperties": 5,
"maxProperties": 5,
"required": [
"heading",
"beforeHash",
"afterHash",
"beforeText",
"afterText"
],
"properties": {
"heading": {
"type": "string",
"minLength": 1,
"maxLength": 8192
},
"beforeHash": {
"type": "string",
"minLength": 64,
"maxLength": 64
},
"afterHash": {
"type": "string",
"minLength": 64,
"maxLength": 64
},
"beforeText": {
"type": "string",
"minLength": 0,
"maxLength": 65536
},
"afterText": {
"type": "string",
"minLength": 0,
"maxLength": 65536
}
}
}
},
"summary": {
"type": "object",
"additionalProperties": false,
"minProperties": 3,
"maxProperties": 3,
"required": [
"added",
"removed",
"changed"
],
"properties": {
"added": {
"type": "integer",
"minimum": 0,
"maximum": 2000
},
"removed": {
"type": "integer",
"minimum": 0,
"maximum": 2000
},
"changed": {
"type": "integer",
"minimum": 0,
"maximum": 2000
}
}
}
}
}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/document_diff/invoke \
-H "Content-Type: application/json" \
--data '{"before":"# Before","after":"# After"}'