# proof.arakelproof.space Federal Register Search

> proof.arakelproof.space Federal Register Search is a paid API for AI agents from proof.arakelproof.space, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Searches the Federal Register by topic, entity, rule, notice, order, or publication term and returns results with signed, machine-verifiable evidence of authenticity.

## Facts

- Endpoint: GET https://proof.arakelproof.space/v1/federal-register-search
- 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/proof-arakelproof-space-federal-register-search-4b212cbd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_MQOHY_t17vGgmsEqqUsV-

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 proof-arakelproof-space-federal-register-search-4b212cbd
```

Example prompt: Search the Federal Register for any rules or notices about cryptocurrency regulation and give me the results with signed proof that they're official government publications.

## When to prefer this

Choose this endpoint when you need not just Federal Register search results but also cryptographic proof of authenticity — ideal for legal, compliance, or journalistic use cases where you must demonstrate that a regulation or notice is genuinely official. Prefer this over a plain web search or a generic government document API when machine-verifiable attestation is required alongside the content.

## Known failure modes

- No matching documents found for the given search term — returns empty results
- Overly broad queries may return too many results or be rate-limited
- Malformed or ambiguous query terms may yield irrelevant results
- Service unavailable if Federal Register upstream is down
- Payment failure (insufficient USDC) results in 402 error before search is executed
- Proof signing service failure may return results without a valid attestation

## How this service works

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

## Output

Returns matching Federal Register documents (rules, notices, orders, or other publications) along with a signed, machine-verifiable proof certificate attesting to the authenticity and official origin of the search results. The response includes document metadata such as title, type, publication date, and relevant text excerpts, paired with a cryptographic signature that proves the evidence is official.

## 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",
     "required": [
      "q"
     ],
     "properties": {
      "q": {
       "type": "string",
       "description": "Federal Register search by topic, entity, rule, notice, order, or publication term with signed official evidence."
      },
      "to": {
       "type": "string",
       "format": "date-time",
       "description": "Optional UTC end. Defaults to now."
      },
      "from": {
       "type": "string",
       "format": "date-time",
       "description": "Optional UTC start. Defaults to the last 90 days."
      }
     }
    }
   },
   "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.machine-evidence.v2",
  "source": {
   "id": "federal-register"
  },
  "evidence": [
   {}
  ],
  "signature": {
   "alg": "Ed25519"
  },
  "observed_count": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/proof-arakelproof-space-federal-register-search-4b212cbd/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)