Use this service when you need this capability: produces exact and explicitly normalized SHA-256 fingerprints for bounded text, JSON, HTML, or base64 bytes.
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/content_fingerprint/invokeProduces exact and explicitly normalized SHA-256 fingerprints for bounded text, JSON, HTML, or base64 bytes.
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 |
|---|---|---|---|
| text | string | Optional | Minimum length 0; Maximum length 65536 |
| json | object or array or string or number or boolean or null | Optional | See the complete OpenAPI schema. |
| html | string | Optional | Minimum length 1; Maximum length 65536 |
| base64 | string | Optional | Pattern: ^[A-Za-z0-9+/]*={0,2}$; Minimum length 0; Maximum length 65536 |
| type | string | Optional | Minimum length 1; Maximum length 128 |
{
"text": "example"
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 1,
"maxProperties": 2,
"required": [],
"properties": {
"text": {
"type": "string",
"minLength": 0,
"maxLength": 65536
},
"json": {
"type": [
"object",
"array",
"string",
"number",
"boolean",
"null"
]
},
"html": {
"type": "string",
"minLength": 1,
"maxLength": 65536
},
"base64": {
"type": "string",
"pattern": "^[A-Za-z0-9+/]*={0,2}$",
"minLength": 0,
"maxLength": 65536
},
"type": {
"type": "string",
"minLength": 1,
"maxLength": 128
}
}
}Illustrative output from the canonical adapter fixture and schema. It is not a completed paid execution or a current live observation.
{
"sha256": "0000000000000000000000000000000000000000000000000000000000000000",
"normalizedSha256": "0000000000000000000000000000000000000000000000000000000000000000",
"byteCount": 0,
"normalizedLength": 0,
"type": "example",
"normalization": "example"
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 6,
"maxProperties": 6,
"required": [
"sha256",
"normalizedSha256",
"byteCount",
"normalizedLength",
"type",
"normalization"
],
"properties": {
"sha256": {
"type": "string",
"pattern": "^[0-9a-f]{64}$",
"minLength": 64,
"maxLength": 64
},
"normalizedSha256": {
"type": "string",
"pattern": "^[0-9a-f]{64}$",
"minLength": 64,
"maxLength": 64
},
"byteCount": {
"type": "integer",
"minimum": 0,
"maximum": 1048576
},
"normalizedLength": {
"type": "integer",
"minimum": 0,
"maximum": 1048576
},
"type": {
"type": "string",
"minLength": 1,
"maxLength": 128
},
"normalization": {
"type": "string",
"minLength": 1,
"maxLength": 128
}
}
}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/content_fingerprint/invoke \
-H "Content-Type: application/json" \
--data '{"text":"example"}'