# Additive Atlas – Substance Cross-Jurisdiction Diff

> Additive Atlas – Substance Cross-Jurisdiction Diff is a paid API for AI agents from api.additiveatlas.monon.space, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-16).

Returns what every major jurisdiction (JP, EU, US, Codex, IARC, JECFA, EFSA) says about a single food additive substance, with per-cell sources and derived vs. primary data kept separate

## Facts

- Endpoint: GET https://api.additiveatlas.monon.space/v1/substances/:id/diff?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/additive-atlas-substance-cross-jurisdiction-diff-d437602e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Ubw7xd_CI4p0LBCHHhb3S

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 additive-atlas-substance-cross-jurisdiction-diff-d437602e
```

Example prompt: What does every major food safety authority — EU, US, Japan, Codex, IARC, JECFA, and EFSA — say about E330 (eu:e330)? Show me the per-jurisdiction breakdown with sources and flag anything that was derived rather than directly stated.

## When to prefer this

Use this endpoint when you need a single-substance, multi-jurisdiction regulatory comparison with explicit sourcing and a clear distinction between primary and derived data. It is preferable over general web search when you need structured, per-cell sourced regulatory data in a machine-readable format across JP, EU, US, Codex, IARC, JECFA, and EFSA simultaneously.

## Known failure modes

- Unknown substance ID returns an error or refusal — IDs must be obtained from the free /v1/substances search endpoint first
- If cross-jurisdiction data is too sparse or ambiguous, the API returns a refusal rather than a low-confidence guess
- Derived conclusions may be incorrect — the response flags confidence and coverage to indicate reliability
- Network or payment (x402) failures may result in no response; caller must handle 402 Payment Required

## How this service works

One substance, with the cross-axis derivation: what every other jurisdiction (JP, EU, US, Codex, IARC, JECFA, EFSA) says about it, with per-cell sources, kept separate from what was derived

## Output

A structured object with one entry per jurisdiction (JP, EU, US, Codex, IARC, JECFA, EFSA) describing the regulatory status of the substance in that jurisdiction, each cell annotated with its source(s). A separate 'derived' section flags any status, coverage, or confidence values that were inferred rather than directly sourced. If nothing can be concluded, the API returns a refusal rather than an empty or misleading result.

## 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"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "id"
     ],
     "properties": {
      "id": {
       "type": "string",
       "description": "Substance id as returned by the free endpoints (GET /v1/substances?name=…&axis=…&lang=…, POST /v1/labels/analyze), e.g. eu:e330, jp:designated-aspartame, us:cfr-184-1033"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "substance",
      "meta"
     ],
     "properties": {
      "meta": {
       "type": "object"
      },
      "substance": {
       "type": "object"
      }
     },
     "description": "What every other jurisdiction says about the substance (primary, with per-cell sources) kept separate from what was derived (derived: status, coverage, confidence); refusal when nothing can be concluded. Full response shape and vocabulary: /openapi.yaml on this host. Every record is a draft and needs verification; not a safety judgement."
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/additive-atlas-substance-cross-jurisdiction-diff-d437602e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.additiveatlas.monon.space](https://www.zero.xyz/host/api.additiveatlas.monon.space/llms.txt)