# ARAKEL Machine Evidence Network – Prove Not Observed

> ARAKEL Machine Evidence Network – Prove Not Observed is a paid API for AI agents from proof.arakelproof.space, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-14).

Returns a cryptographically signed machine-readable proof that a given entity was NOT_OBSERVED on official sanctions/watchlist sources (e.g. OFAC), with OBSERVED/INCONCLUSIVE alternatives.

## Facts

- Endpoint: GET https://proof.arakelproof.space/v1/machine/prove-not-observed
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/arakel-machine-evidence-network-prove-not-observed-d7cfe6df
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_CohhXXj8xO_y-s1htbmZq

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 arakel-machine-evidence-network-prove-not-observed-d7cfe6df
```

Example prompt: Can you get a cryptographically signed NOT_OBSERVED proof from ARAKEL for counterparty 'Acme Trading Ltd' against the OFAC sanctions list so I have machine-readable compliance evidence before I send payment?

## When to prefer this

Choose this endpoint when you need a cryptographically signed, machine-readable proof that a specific entity is NOT on a sanctioned or watched list — particularly for automated compliance workflows, audit trails, or agent-to-agent due diligence where human-readable reports are insufficient. Prefer it over manual screening tools when you need Ed25519-attested evidence compatible with automated verification pipelines and when OFAC or similar official-source coverage is required.

## Known failure modes

- Entity identifier not found or ambiguous — may return INCONCLUSIVE
- Source list unavailable or temporarily offline — endpoint may return error or INCONCLUSIVE
- Invalid or missing entity parameter — HTTP 400 bad request
- Payment not settled — HTTP 402 payment required (x402 protocol)
- Rate limiting or quota exceeded — HTTP 429
- Signature verification failure on response — indicates data integrity issue

## How this service works

Machine-verifiable official-source evidence with free preflight and x402 USDC payments on Base.

## Output

A JSON object containing: a result field with OBSERVED, NOT_OBSERVED, or INCONCLUSIVE; the schema identifier (arakel.machine-evidence.v2); the source that was queried (e.g. id: 'ofac'); and a cryptographic signature block using Ed25519 algorithm — providing a tamper-evident, machine-readable compliance proof.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": "OBSERVED|NOT_OBSERVED|INCONCLUSIVE",
  "schema": "arakel.machine-evidence.v2",
  "source": {
   "id": "ofac"
  },
  "signature": {
   "alg": "Ed25519"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arakel-machine-evidence-network-prove-not-observed-d7cfe6df/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from proof.arakelproof.space](https://www.zero.xyz/host/proof.arakelproof.space/llms.txt)