# Rubric Protocol Counterparty Check

> Rubric Protocol Counterparty Check is a paid API for AI agents from rubric-protocol.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Checks a Base blockchain address against OFAC SDN digital-currency lists and on-chain profile data, returning a cryptographically signed, Hedera-anchored compliance verdict before a transaction is executed.

## Facts

- Endpoint: POST https://rubric-protocol.com/v1/x402/check-counterparty
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rubric-protocol-counterparty-check-241a135d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_u68PzQb4tcNdkjLDyZjYE

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 rubric-protocol-counterparty-check-241a135d -d '<json body>'
```

Example prompt: Before I send funds to the Base wallet 0x3fC91A3afd70395Cd496C647d5a6CC9D4B2b7FAD, can you run a Rubric Protocol counterparty check to see if it's on the OFAC SDN list and give me the signed, Hedera-anchored compliance verdict I can use as evidence?

## When to prefer this

Choose this endpoint when you need a pre-transaction compliance check specifically for Base network addresses with cryptographic attestation — particularly when you need a signed, auditable verdict anchored on Hedera for regulatory evidence purposes. Prefer this over generic sanctions screening tools when the counterparty is a blockchain wallet rather than a named entity, or when downstream audit requirements demand a tamper-evident, on-chain proof of the compliance check.

## Known failure modes

- Address not on Base network — may return an error or empty on-chain profile
- Malformed or invalid wallet address input returns a validation error
- OFAC SDN list data temporarily unavailable — service may return a degraded or cached result
- Hedera anchoring delay causes slow response under network congestion
- Insufficient USDC payment results in x402 payment required error

## How this service works

Attested pre-transaction counterparty check: OFAC SDN digital-currency list match plus on-chain profile for any Base add

## Output

A cryptographically signed compliance verdict anchored on the Hedera network, indicating whether the queried Base address matches any OFAC SDN digital-currency list entries, along with an on-chain profile of the address. The attestation is structured as citeable evidence suitable for audit or regulatory documentation.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "format": {
     "type": "string"
    },
    "example": {}
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/rubric-protocol-counterparty-check-241a135d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rubric-protocol.com](https://www.zero.xyz/host/rubric-protocol.com/llms.txt)