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SignalHarness Artifact Verify
x402
SignalHarness Artifact Verify is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Verifies the integrity of a remote artifact by fetching it and comparing its SHA-256 hash, byte size, and MIME type against expected values.
Price / call$0.005
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object with a 'status' field (e.g. 'VERIFIED' or an error state), the calculated SHA-256 hash of the fetched artifact, and its actual byte size. Also includes a receipt object with payment confirmation, latency metrics, service version, and a result SHA-256 for auditing the response itself.
Example use cases
Software release integrity check
“Before I install this binary, can you confirm that https://releases.myapp.com/v2.1/installer.pkg has the SHA-256 hash d4e5f6...a1b2c3 and is exactly 5242880 bytes with MIME type application/octet-stream?”
AI model weight verification
“I downloaded a model weights file — can you check that https://storage.example.com/models/llm-weights-v3.bin matches the expected SHA-256 checksum 0a1b2c...9f8e7d and is 10485760 bytes?”
Supply chain artifact audit
“Before our CI pipeline uses the artifact at https://artifacts.corp.io/libs/libcrypto.so, please verify its SHA-256 is 1234abcd...ef567890 and its MIME type is application/x-sharedlib.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/artifact_verify/invokeWhen to prefer
Use this endpoint when you need a cryptographically sound, server-side verification of a remote file's integrity — particularly when you cannot trust the client environment to compute hashes reliably, or when you need a tamper-evident receipt of the verification. Ideal for supply chain security, release pipeline validation, and agent workflows that consume external artifacts before acting on them.
Side effects
- URL not reachable or returns non-200 — verification fails with a network error
- SHA-256 mismatch — status will indicate verification failure rather than VERIFIED
- Byte size mismatch when expectedByteSize is provided
- File exceeds 10 MB limit — request rejected by schema validation
- Invalid SHA-256 format (not 64 hex characters) — rejected at input validation
- Invalid or malformed URL — rejected by pattern validation
- Payment failure — endpoint returns 402 if USDC payment is not provided
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | |
| expectedSha256 | string | |
| expectedByteSize | integer | |
| expectedMimeType | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"status": "VERIFIED",
"byteSize": 0,
"calculatedSha256": "0000000000000000000000000000000000000000000000000000000000000000"
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "artifact_verify",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "5000",
"resultSha256": "4dbe334ff68438b7d30fb15362500240824a991c41a365535c542eb5e448ead6",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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