Agent Embassy Verified Web Check

x402

Agent Embassy Verified Web Check is a paid API for AI agents from agent-embassy.fly.dev, paid per call via x402, $0.15/call, status unknown (last checked 2026-10-11).

Fetches a public HTTPS URL server-side, checks it against user-defined conditions (status, body substring, or JSON field), and returns a cryptographically signed, re-verifiable Outcome Receipt proving the result

Price / call$0.15

Seller volume →—

Success—

StatusUnknown

How this service works

Verify a web claim and get a signed, re-checkable Outcome Receipt — machine-verifiable proof of delivery for agent commerce. The Embassy fetches your HTTPS URL once, server-side, and checks it against your conditions: HTTP status, a body substring, or a JSON field value. The receipt records the check transcript and verdict so anyone can re-verify. $0.15 per check via x402. Fully automated, no human review.

Output

A signed JSON Outcome Receipt containing: a unique receipt_id (e.g. 'emb_jkl012'), the verdict ('pass' or 'fail'), the payer wallet account address, a chain-of-custody array (request, authorization, action, proof, liability_boundary), receipt version string, tool name, and status. The receipt can be shared with any counterparty and independently re-verified.

Example use cases

Proof of delivery for agent payment

“I just paid an agent to complete a task and it says it's done — can you check https://taskagent.example.com/jobs/abc789/result and verify the JSON field 'status' equals 'complete', then get me a signed receipt I can use as proof?”

Webhook callback confirmation

“After my checkout flow, can you verify that https://shop.example.com/webhooks/confirm/order99 returns HTTP 200 and contains the text 'payment_confirmed' in the body, and give me the outcome receipt?”

Live site health attestation

“I need a machine-verifiable signed receipt proving that https://dashboard.myapp.io/health is returning HTTP 200 right now — can you run that check and get me the receipt ID?”

Technical details

Endpoint

POSThttps://agent-embassy.fly.dev/v1/check/verify?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need tamper-evident, machine-verifiable proof that a specific public HTTPS URL returned a particular status, body content, or JSON field value — especially in agent-to-agent commerce contexts where a neutral third-party attestation is required. Prefer it over DIY HTTP checks when auditability, re-verifiability by counterparties, and signed receipts matter. It is particularly suited for post-payment delivery verification, webhook confirmation, and any scenario where a counterparty needs to independently re-verify the outcome.

Side effects

URL points to a private IP or non-public host — refused with an error
HTTP status does not match expect_status — receipt issued with verdict 'fail'
Body does not contain expect_body_contains substring — verdict 'fail'
JSON path does not exist or value does not match expect_json_equals — verdict 'fail'
URL is unreachable or times out — error or fail verdict
x402 payment not completed or insufficient — request rejected before check
Invalid or malformed URL provided — request rejected

Input

Schema · Request body

Field	Type	Description
url	string	HTTPS URL to check (max 2000 chars; no credentials in URL). Fetched once; up to 3 redirects followed, 10s timeout, 1MB body cap
expect_status	number	Expected HTTP status code; truncated to an integer. Defaults to 200 when omitted
idempotency_key	string	Idempotency key: UUID v4, client-generated, one per logical request. Replaying the same key on this tool returns the original receipt — the action is not re-run, and the first request's receipt wins even if you resend different inputs. Published example keys are rejected. Keys are scoped per tool and per payer account: a key never returns another wallet's receipt.
expect_json_path	string	Dot-separated path into the JSON body, e.g. 'data.price' (max 500 chars). Only evaluated when set
expect_json_equals	—	Expected value at expect_json_path; compared by canonical JSON equality. Defaults to null when omitted
expect_body_contains	string	Substring that must appear in the response body (max 5000 chars). Skipped when empty or omitted

Output

Schema · Response

{
  "type": "json",
  "example": {
    "tool": "verified_check",
    "chain": [
      "request",
      "authorization",
      "action",
      "proof",
      "liability_boundary"
    ],
    "status": "complete",
    "account": "0x1111111111111111111111111111111111111111",
    "verdict": "pass",
    "receipt_id": "emb_jkl012",
    "receipt_version": "embassy-receipt/1"
  }
}

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