DELTA Witness Preflight Check

x402

DELTA Witness Preflight Check is a paid API for AI agents from delta-witness-api.ruphussten.workers.dev, paid per call via x402, $5/call, status unknown (last checked 2026-09-13).

Fetches a public URL, verifies its content against expected conditions, and returns a cryptographic proof bundle for machine-verifiable trust before an autonomous action

Price / call$5

Seller volume →—

Success—

StatusUnknown

How this service works

Paid, machine-verifiable capture and preflight checks for public web sources.

Output

A JSON object indicating whether the preflight passed (ok, safe, changed flags), a UUID proof_id, a SHA-256 bundle_root hash of the observed content, an ISO 8601 observed_at timestamp, and URLs to the full proof manifest and human-readable public proof page for independent verification.

Example use cases

Pre-trade price page attestation

“Before executing that limit order, verify https://exchange.example.com/BTC-USDC still shows 'Trading Active' and doesn't contain 'Maintenance Mode' — give me a cryptographic proof it looked that way within the last 60 seconds.”

Agent safety check before form submission

“Before my agent submits the grant application, preflight-check https://grants.example.gov/apply to confirm the page still contains 'Accepting Submissions' and hasn't changed since proof ID a1b2c3d4-1234-5678-abcd-ef0123456789.”

Compliance snapshot before legal filing

“Capture and attest the current state of https://regulations.example.gov/rule/2024-001 — I need a machine-verifiable proof bundle showing the exact content at observation time with freshness under 3600 seconds for our audit trail.”

Technical details

Endpoint

POSThttps://delta-witness-api.ruphussten.workers.dev/v1/preflight

When to prefer

Choose this endpoint when an autonomous agent needs machine-verifiable, cryptographically-attested evidence of a public web page's content state before taking an irreversible or high-stakes action. It is distinct from simple web scraping because it produces a signed proof bundle with a persistent manifest URL — ideal for audit trails, compliance workflows, or multi-agent trust chains where one agent must prove to another what a page said at a specific moment.

Side effects

URL is unreachable or returns a non-200 status — ok:false with network error detail
Expected 'contains' strings not found in fetched content — safe:false
Expected 'excludes' strings found in fetched content — safe:false
Content hash differs from prior_proof_id baseline — changed:true
Content is older than freshness_seconds threshold — staleness violation
Invalid URL format (not http/https) — 400 validation error
prior_proof_id not found or malformed — 422 error
Payment not received or insufficient — 402 Payment Required

Input

Schema · Request body

Field	Type	Description
url	string	Public HTTP(S) source to observe before an action.
expected	object
prior_proof_id	string	Optional DELTA proof to use as the hash baseline.
freshness_seconds	integer

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "safe": true,
    "changed": false,
    "product": "preflight",
    "proof_id": "7d9d12f7-8f91-5f41-9f0c-5ef257d9ea5d",
    "bundle_root": "sha256:0000000000000000000000000000000000000000000000000000000000000000",
    "observed_at": "2026-08-31T00:00:00.000Z",
    "manifest_url": "https://delta-witness-api.ruphussten.workers.dev/v1/proofs/7d9d12f7-8f91-5f41-9f0c-5ef257d9ea5d",
    "public_proof_url": "https://delta-witness-api.ruphussten.workers.dev/p/7d9d12f7-8f91-5f41-9f0c-5ef257d9ea5d"
  }
}

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How this service works

Paid, machine-verifiable capture and preflight checks for public web sources.

Output

Example use cases

Pre-trade price page attestation

Agent safety check before form submission

Compliance snapshot before legal filing

Technical details

Endpoint

POSThttps://delta-witness-api.ruphussten.workers.dev/v1/preflight

When to prefer

Side effects

URL is unreachable or returns a non-200 status — ok:false with network error detail
Expected 'contains' strings not found in fetched content — safe:false
Expected 'excludes' strings found in fetched content — safe:false
Content hash differs from prior_proof_id baseline — changed:true
Content is older than freshness_seconds threshold — staleness violation
Invalid URL format (not http/https) — 400 validation error
prior_proof_id not found or malformed — 422 error
Payment not received or insufficient — 402 Payment Required

Input

Schema · Request body

Field	Type	Description
url	string	Public HTTP(S) source to observe before an action.
expected	object
prior_proof_id	string	Optional DELTA proof to use as the hash baseline.
freshness_seconds	integer

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "safe": true,
    "changed": false,
    "product": "preflight",
    "proof_id": "7d9d12f7-8f91-5f41-9f0c-5ef257d9ea5d",
    "bundle_root": "sha256:0000000000000000000000000000000000000000000000000000000000000000",
    "observed_at": "2026-08-31T00:00:00.000Z",
    "manifest_url": "https://delta-witness-api.ruphussten.workers.dev/v1/proofs/7d9d12f7-8f91-5f41-9f0c-5ef257d9ea5d",
    "public_proof_url": "https://delta-witness-api.ruphussten.workers.dev/p/7d9d12f7-8f91-5f41-9f0c-5ef257d9ea5d"
  }
}