Use this service when you need this capability: audits bounded supplied or safely fetched HTTP headers for caching, security, discovery, CORS, and x402 signals.
0.01 USDC per call
x402 V1 + V2 exact payment on Base mainnet (base in V1; eip155:8453 in V2) using USDC. One HTTP 402 response carries the canonical V2 PAYMENT-REQUIRED header and equivalent V1 JSON body.
POST https://signalharness.ai/api/agent/services/http_header_audit/invokeAudits bounded supplied or safely fetched HTTP headers for caching, security, discovery, CORS, and x402 signals.
Documented public-source retrieval is bounded by the URL, byte, redirect, and timeout limits below. Source availability can affect execution; review the input schema and returned source metadata.
| Field | Type | Required | Limits |
|---|---|---|---|
| url | string | Optional | Pattern: ^https://; Minimum length 9; Maximum length 2048 |
| headers | array | Optional | Minimum 1 item(s); Maximum 128 item(s) |
| status | integer | Optional | Minimum 100; Maximum 599 |
{
"headers": [
[
"content-type",
"text/html"
],
[
"cache-control",
"max-age=60"
]
]
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 1,
"maxProperties": 2,
"required": [],
"properties": {
"url": {
"type": "string",
"pattern": "^https://",
"minLength": 9,
"maxLength": 2048
},
"headers": {
"type": "array",
"minItems": 1,
"maxItems": 128,
"items": {
"type": "array",
"minItems": 2,
"maxItems": 2,
"items": {
"type": "string",
"minLength": 0,
"maxLength": 8192
}
}
},
"status": {
"type": "integer",
"minimum": 100,
"maximum": 599
}
}
}Illustrative output from the canonical adapter fixture and schema. It is not a completed paid execution or a current live observation.
{
"sourceUrl": "example",
"status": 0,
"normalizedHeaders": [
{
"name": "example",
"values": [
"example"
]
}
],
"findings": [
{
"code": "duplicate_header",
"severity": "info",
"header": "example"
}
],
"result": "pass",
"cacheSummary": {
"present": [
"example"
],
"missing": [
"example"
]
},
"securitySummary": {
"present": [
"example"
],
"missing": [
"example"
]
},
"discoverySummary": {
"present": [
"example"
],
"missing": [
"example"
]
}
}{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"type": "object",
"additionalProperties": false,
"minProperties": 8,
"maxProperties": 8,
"required": [
"sourceUrl",
"status",
"normalizedHeaders",
"findings",
"result",
"cacheSummary",
"securitySummary",
"discoverySummary"
],
"properties": {
"sourceUrl": {
"type": "string",
"minLength": 0,
"maxLength": 2048
},
"status": {
"type": "integer",
"minimum": 0,
"maximum": 599
},
"normalizedHeaders": {
"type": "array",
"minItems": 1,
"maxItems": 128,
"items": {
"type": "object",
"additionalProperties": false,
"minProperties": 2,
"maxProperties": 2,
"required": [
"name",
"values"
],
"properties": {
"name": {
"type": "string",
"minLength": 1,
"maxLength": 256
},
"values": {
"type": "array",
"minItems": 1,
"maxItems": 128,
"items": {
"type": "string",
"minLength": 0,
"maxLength": 8192
}
}
}
}
},
"findings": {
"type": "array",
"minItems": 0,
"maxItems": 256,
"items": {
"type": "object",
"additionalProperties": false,
"minProperties": 3,
"maxProperties": 3,
"required": [
"code",
"severity",
"header"
],
"properties": {
"code": {
"type": "string",
"enum": [
"duplicate_header",
"missing_header",
"cors_wildcard_credentials"
],
"minLength": 14,
"maxLength": 25
},
"severity": {
"type": "string",
"enum": [
"info",
"warn",
"fail"
],
"minLength": 4,
"maxLength": 4
},
"header": {
"type": "string",
"minLength": 1,
"maxLength": 256
}
}
}
},
"result": {
"type": "string",
"enum": [
"pass",
"warn",
"fail"
],
"minLength": 4,
"maxLength": 4
},
"cacheSummary": {
"type": "object",
"additionalProperties": false,
"minProperties": 2,
"maxProperties": 2,
"required": [
"present",
"missing"
],
"properties": {
"present": {
"type": "array",
"minItems": 0,
"maxItems": 16,
"items": {
"type": "string",
"minLength": 1,
"maxLength": 256
}
},
"missing": {
"type": "array",
"minItems": 0,
"maxItems": 16,
"items": {
"type": "string",
"minLength": 1,
"maxLength": 256
}
}
}
},
"securitySummary": {
"type": "object",
"additionalProperties": false,
"minProperties": 2,
"maxProperties": 2,
"required": [
"present",
"missing"
],
"properties": {
"present": {
"type": "array",
"minItems": 0,
"maxItems": 16,
"items": {
"type": "string",
"minLength": 1,
"maxLength": 256
}
},
"missing": {
"type": "array",
"minItems": 0,
"maxItems": 16,
"items": {
"type": "string",
"minLength": 1,
"maxLength": 256
}
}
}
},
"discoverySummary": {
"type": "object",
"additionalProperties": false,
"minProperties": 2,
"maxProperties": 2,
"required": [
"present",
"missing"
],
"properties": {
"present": {
"type": "array",
"minItems": 0,
"maxItems": 16,
"items": {
"type": "string",
"minLength": 1,
"maxLength": 256
}
},
"missing": {
"type": "array",
"minItems": 0,
"maxItems": 16,
"items": {
"type": "string",
"minLength": 1,
"maxLength": 256
}
}
}
}
}
}Timeout: 20000 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/http_header_audit/invoke \
-H "Content-Type: application/json" \
--data '{"headers":[["content-type","text/html"],["cache-control","max-age=60"]]}'