Use this service when you need this capability: detects exact and normalized duplicate text blocks using deterministic hashes while retaining canonical representatives and source order.
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/text_deduplicate/invokeDetects exact and normalized duplicate text blocks using deterministic hashes while retaining canonical representatives and source order.
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 |
|---|---|---|---|
| items | array | Optional | Minimum 1 item(s); Maximum 256 item(s) |
| document | string | Optional | Minimum length 1; Maximum length 65536 |
| caseSensitive | boolean | Optional | See the complete OpenAPI schema. |
{
"items": [
"example",
"example"
]
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 1,
"maxProperties": 2,
"required": [],
"properties": {
"items": {
"type": "array",
"minItems": 1,
"maxItems": 256,
"items": {
"type": "string",
"minLength": 0,
"maxLength": 65536
}
},
"document": {
"type": "string",
"minLength": 1,
"maxLength": 65536
},
"caseSensitive": {
"type": "boolean"
}
}
}Illustrative output from the canonical adapter fixture and schema. It is not a completed paid execution or a current live observation.
{
"itemCount": 1,
"exactDuplicateGroups": [
"example"
],
"normalizedDuplicateGroups": [
"example"
],
"canonicalRepresentatives": [
{
"ordinal": 0,
"text": "Example caller-supplied content.",
"exactHash": "0000000000000000000000000000000000000000000000000000000000000000",
"normalizedHash": "0000000000000000000000000000000000000000000000000000000000000000"
}
],
"retainedOrder": [
0
]
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 5,
"maxProperties": 5,
"required": [
"itemCount",
"exactDuplicateGroups",
"normalizedDuplicateGroups",
"canonicalRepresentatives",
"retainedOrder"
],
"properties": {
"itemCount": {
"type": "integer",
"minimum": 1,
"maximum": 256
},
"exactDuplicateGroups": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "string",
"minLength": 2,
"maxLength": 8192
}
},
"normalizedDuplicateGroups": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "string",
"minLength": 2,
"maxLength": 8192
}
},
"canonicalRepresentatives": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "object",
"additionalProperties": false,
"minProperties": 4,
"maxProperties": 4,
"required": [
"ordinal",
"text",
"exactHash",
"normalizedHash"
],
"properties": {
"ordinal": {
"type": "integer",
"minimum": 0,
"maximum": 255
},
"text": {
"type": "string",
"minLength": 0,
"maxLength": 65536
},
"exactHash": {
"type": "string",
"pattern": "^[0-9a-f]{64}$",
"minLength": 64,
"maxLength": 64
},
"normalizedHash": {
"type": "string",
"pattern": "^[0-9a-f]{64}$",
"minLength": 64,
"maxLength": 64
}
}
}
},
"retainedOrder": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "integer",
"minimum": 0,
"maximum": 255
}
}
}
}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/text_deduplicate/invoke \
-H "Content-Type: application/json" \
--data '{"items":["example","example"]}'