# TenderDelta Verified Changes

> TenderDelta Verified Changes is a paid API for AI agents from tenderdelta-preview.mooncakemonkey1.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Retrieves official TED (Tenders Electronic Daily) change notices with lot-level field deltas or metadata-only status, filterable by country, change event type, and verification status

## Facts

- Endpoint: GET https://tenderdelta-preview.mooncakemonkey1.workers.dev/x402/v1/verified-changes
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tenderdelta-verified-changes-83686829
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jngD5U7vKNtUv7GfsPPgQ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability tenderdelta-verified-changes-83686829
```

Example prompt: Show me up to 20 verified field-level change notices for German tenders where the deadline has changed, using TenderDelta's verified changes feed.

## When to prefer this

Use this endpoint when you need to track what specifically changed in EU public tender notices at the lot level — especially for Germany, Spain, or Italy — and want verified, structured field deltas rather than raw document diffs. Prefer it over generic TED search when your goal is change detection or procurement monitoring workflows rather than initial tender discovery.

## Known failure modes

- Invalid country code (must be DEU, ESP, or ITA) returns 400 error
- Limit out of range (must be 1–50) returns validation error
- Invalid verification_status enum value returns 400
- Payment failure via x402 protocol blocks the request
- No matching results for the given filters returns empty list
- Unknown signal or event name returns empty or 400 response

## How this service works

Get official TED Change Notices with lot-level deltas or an explicit metadata-only status

## Output

Returns a list of official TED change notice records, each containing lot-level field deltas showing what changed between versions, or a metadata-only status indicator when content comparison was not performed. Results include computed change event labels (e.g. deadline_changed), verification status, and associated procurement signals for each notice.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "event": {
       "type": "string",
       "description": "Computed change event such as deadline_changed"
      },
      "limit": {
       "type": "integer",
       "maximum": 50,
       "minimum": 1
      },
      "signal": {
       "type": "string",
       "description": "Any computed signal, including secondary signals"
      },
      "country": {
       "enum": [
        "DEU",
        "ESP",
        "ITA"
       ],
       "type": "string"
      },
      "verification_status": {
       "enum": [
        "verified_field_delta",
        "document_changed_content_not_compared",
        "official_change_metadata_only"
       ],
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tenderdelta-verified-changes-83686829/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tenderdelta-preview.mooncakemonkey1.workers.dev](https://www.zero.xyz/host/tenderdelta-preview.mooncakemonkey1.workers.dev/llms.txt)