# RadhikaChain ZK Proof of Knowledge (PoK) Endpoint

> RadhikaChain ZK Proof of Knowledge (PoK) Endpoint is a paid API for AI agents from x402.radhikachain.xyz, paid per call via x402, $5.148/call, status unknown (last checked 2026-09-15).

Generates a zero-knowledge proof of knowledge (Halo2/Nova/Plonky3) verifying a claimed value on-chain, returning a proof blob, status, and claimed count, paid per-call in USDC via x402.

## Facts

- Endpoint: POST https://x402.radhikachain.xyz/pok
- Price: $5.148/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/radhikachain-zk-proof-of-knowledge-pok-endpoint-6cff28fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EbGkyLYgqqqJwMvkZw_45

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 radhikachain-zk-proof-of-knowledge-pok-endpoint-6cff28fb -d '<json body>'
```

Example prompt: Use RadhikaChain's PoK endpoint to generate a zero-knowledge proof of knowledge attesting to my claimed membership count of 4 — I need a Halo2/Nova/Plonky3 proof blob and a status confirmation, paying $0.99 USDC per call via x402.

## When to prefer this

Choose this endpoint when you need a pay-per-use, zero-knowledge proof of knowledge generated by a multi-scheme ZK backend (Halo2, Nova, Plonky3) without requiring account registration or subscriptions. It is ideal for agents needing on-demand cryptographic attestations, membership proofs, or verifiable computation results payable in USDC on Base via x402. Prefer it over hosted ZK SaaS platforms when you want per-call billing with no commitments and native Base USDC settlement.

## Known failure modes

- Invalid or malformed proof request payload — returns error status
- Payment not included or insufficient USDC balance — x402 payment required before computation
- ZK circuit constraint violation — proof generation fails if inputs don't satisfy the circuit
- Rate limiting or capacity constraints — endpoint may reject requests under high load
- Network timeout during proof generation — verifiable compute may take longer than expected for complex circuits

## How this service works

Telemetria de cadena, inteligencia de defensa y computo verificable (Halo2, Nova, Plonky3). Pago por peticion en USDC nativo en Base (eip155:8453) mediante x402 v2 scheme exact; sin cuenta ni suscripcion. Catalogo canonico: GET /.well-known/x402.

## Output

Returns a JSON object containing a ZK proof blob (base64 or hex-encoded cryptographic proof artifact), a status field indicating success or failure ('ok'), and a claimed integer count representing the number of claims proven. The proof can be submitted on-chain or to a verifier for trustless validation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "properties": {
    "body": {
     "type": "object",
     "additionalProperties": true
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": true
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "proof": "...",
  "status": "ok",
  "claimed": 4
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/radhikachain-zk-proof-of-knowledge-pok-endpoint-6cff28fb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.radhikachain.xyz](https://www.zero.xyz/host/x402.radhikachain.xyz/llms.txt)