# SYNTHORA EU Law Delta Feed (Trust Layer EU)

> SYNTHORA EU Law Delta Feed (Trust Layer EU) is a paid API for AI agents from regfeed.hergertsynthora.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Returns Ed25519-signed article-level change deltas for major EU legal acts (AI Act, MiCA, DORA, NIS2, GDPR) sourced live from EUR-Lex/CELLAR, with cryptographic provenance.

## Facts

- Endpoint: POST https://regfeed.hergertsynthora.com/service
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synthora-eu-law-delta-feed-trust-layer-eu-be5e3b19
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HuoWVFBwfLQsAM2q2vMOF

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 synthora-eu-law-delta-feed-trust-layer-eu-be5e3b19 -d '<json body>'
```

Example prompt: Pull me all article-level changes to the EU AI Act and MiCA from EUR-Lex since 2025-01-01, signed with Ed25519 provenance — I need the delta feed starting from that date.

## When to prefer this

Choose this endpoint when you need cryptographically verifiable, article-granular change tracking for specific EU legal acts (AI Act, MiCA, DORA, NIS2, GDPR) sourced directly from the official EUR-Lex/CELLAR repository. It is preferable over generic legal databases when Ed25519-signed provenance is required for audit trails, compliance dashboards, or automated regulatory monitoring pipelines that must prove the integrity of their data source.

## Known failure modes

- Invalid or malformed CELEX ID returns empty feed or 400 error
- Invalid ISO date format in `since` field causes parse error
- Expired or invalid cursor returns pagination error
- EUR-Lex/CELLAR upstream outage may cause delayed or empty feed
- Payment failure (x402) blocks the request before processing
- No deltas found for given date range returns empty feed array with count 0

## How this service works

Ed25519-signed article-level deltas of EU legal acts (AI Act, MiCA, DORA, NIS2, GDPR) live from the official EUR-Lex/CELLAR endpoint, with provenance.

## Output

A JSON object containing: a boolean `ok` flag, the niche tag `regdelta_eu`, a `feed` array of article-level legal change deltas, an `as_of` ISO date, a `count` of results, a `cursor` for pagination, and a `source` field identifying EUR-Lex/CELLAR as the authoritative origin. Each delta entry is Ed25519-signed for cryptographic provenance verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "celex": {
   "type": "string",
   "description": "optional CELEX id filter"
  },
  "since": {
   "type": "string",
   "description": "ISO date - deltas from this date"
  },
  "cursor": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "niche": "regdelta_eu",
  "result": {
   "feed": [],
   "as_of": "2026-07-10",
   "count": 0,
   "cursor": null,
   "source": "EUR-Lex/CELLAR"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synthora-eu-law-delta-feed-trust-layer-eu-be5e3b19/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from regfeed.hergertsynthora.com](https://www.zero.xyz/host/regfeed.hergertsynthora.com/llms.txt)