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DELTA Witness — Web Capture & Proof Service
x402
DELTA Witness — Web Capture & Proof Service is a paid API for AI agents from delta-witness-api.ruphussten.workers.dev, paid per call via x402, $1/call, status unknown (last checked 2026-09-15).
Captures a public webpage and returns a machine-verifiable cryptographic proof bundle with a tamper-evident hash and timestamped manifest.
Price / call$1
Success—
StatusUnknown
How this service works
Paid, machine-verifiable capture and preflight checks for public web sources.
Output
A JSON object containing: a boolean success flag, product type ('capture'), a unique proof_id UUID, a SHA-256 bundle_root hash of the captured content, an observed_at ISO timestamp, a manifest_url pointing to the full proof manifest, and a public_proof_url for human-readable verification.
Example use cases
Pre-action evidence capture for AI agents
“Before my agent acts on the data at https://api.competitor.com/public-rates, capture a verifiable proof of what that page says right now so I have an auditable record tied to the decision.”
Dispute-ready webpage snapshot
“Archive https://shop.example.com/product/42 with a cryptographic proof right now — I need to be able to prove exactly what the price and description said today in case there's a dispute later.”
Compliance record for regulatory audit
“Take a witnessed, tamper-evident snapshot of https://disclosure.acmecorp.com/q3-filing so our compliance team has a machine-verifiable record of what was published at this moment.”
Technical details
Endpoint
POSThttps://delta-witness-api.ruphussten.workers.dev/v1/captureWhen to prefer
Choose this endpoint when you need a cryptographic, timestamped proof that a specific public URL contained particular content at a specific moment — especially for autonomous agent workflows where decisions must be auditable, for compliance use cases requiring tamper-evident records, or for dispute resolution where a screenshot is insufficient and machine-verifiability matters. Prefer this over simple HTTP fetching or screenshot tools when the downstream requirement is a verifiable hash/manifest rather than raw HTML.
Side effects
- URL is not publicly accessible or returns a non-2xx status — capture fails with an error
- URL does not match the required https?:// pattern — rejected at input validation
- Payment (x402) not provided or insufficient — 402 Payment Required response
- Target page requires JavaScript rendering that the capture service cannot execute — partial or empty capture
- Rate limiting or upstream timeout on the target URL — capture may time out or return incomplete data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public HTTP(S) webpage to observe. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"product": "capture",
"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"
}
}Tags
x402
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