# ARAKEL Machine Evidence Network – Counterparty Evidence

> ARAKEL Machine Evidence Network – Counterparty Evidence is a paid API for AI agents from proof.arakelproof.space, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-16).

Returns cryptographically signed machine-readable evidence (OBSERVED, NOT_OBSERVED, or INCONCLUSIVE) for a named entity over a specified time window, sourced from official records.

## Facts

- Endpoint: HEAD https://proof.arakelproof.space/v1/machine/counterparty-evidence
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/arakel-machine-evidence-network-counterparty-evidence-fea3e6aa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1nYvsenQdEqtXz4ZB6qi2

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-counterparty-evidence-fea3e6aa -d '<json body>'
```

Example prompt: Can you pull a signed machine evidence check on 'Acme Logistics LLC' from ARAKEL's counterparty dossier for the period January 1 2024 to June 30 2024, and tell me whether they show up as OBSERVED or NOT_OBSERVED in official sources?

## When to prefer this

Choose this endpoint when you need a cryptographically signed, machine-readable attestation (including NOT_OBSERVED proofs) about a named counterparty from official sources — especially for compliance workflows, due diligence audits, or automated agent pipelines that require verifiable evidence rather than a human-readable report. Prefer this over generic web searches or unverified lookups when legal or regulatory defensibility of the evidence matters.

## Known failure modes

- Missing required query parameters (entity, from, to) returns a 400-level error
- Entity string not recognized in enabled official sources returns INCONCLUSIVE
- Date range outside available data coverage returns INCONCLUSIVE or error
- Payment not included or insufficient (x402 protocol) results in 402 Payment Required
- Service unavailability from upstream official sources may delay or block response

## How this service works

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

## Output

A JSON response containing a 'result' field with one of OBSERVED, NOT_OBSERVED, or INCONCLUSIVE; a schema identifier ('arakel.counterparty-evidence.v1'); and an Ed25519 cryptographic signature attesting to the result's authenticity. The signed proof can be stored or presented as machine-verifiable evidence.

## 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": [
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "entity",
      "from",
      "to"
     ],
     "properties": {
      "to": {
       "type": "string",
       "format": "date-time"
      },
      "from": {
       "type": "string",
       "format": "date-time"
      },
      "term": {
       "type": "string"
      },
      "entity": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": "OBSERVED|NOT_OBSERVED|INCONCLUSIVE",
  "schema": "arakel.counterparty-evidence.v1",
  "signature": {
   "alg": "Ed25519"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/arakel-machine-evidence-network-counterparty-evidence-fea3e6aa/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)