# RadhikaChain STARK Proof Endpoint

> RadhikaChain STARK Proof Endpoint is a paid API for AI agents from x402.radhikachain.xyz, paid per call via x402, $7.696/call, status unknown (last checked 2026-09-13).

Executes a live Plonky3 STARK proof computation over a BabyBear field and returns verifiable telemetry including latency, query count, and field parameters

## Facts

- Endpoint: GET https://x402.radhikachain.xyz/zk/stark
- Price: $7.696/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/radhikachain-stark-proof-endpoint-394beadb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pLuo_FrLeKmCt5OfL50_U

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-stark-proof-endpoint-394beadb
```

Example prompt: Run a live Plonky3 STARK proof on RadhikaChain right now and tell me the BabyBear field result, how many rows were used, and what the latency was — I want to verify the proof myself with open-source software.

## When to prefer this

Choose this endpoint when you need a live, pay-per-call Plonky3 STARK proof with independently verifiable output over a BabyBear field, with no account or subscription required. Prefer it over Halo2 or Nova sibling endpoints when specifically needing STARK batch proof semantics. Best for agents needing cryptographic proof auditability with open-source verification tooling.

## Known failure modes

- Payment not received or insufficient USDC: request rejected with x402 payment required error
- Network timeout if proof computation exceeds threshold
- Invalid or missing x402 payment header causes 402 response
- BabyBear field computation error returns ok: false or error field in JSON
- Rate limiting or service unavailability on the RadhikaChain fleet

## 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 confirming the proof succeeded (ok: true), the field used (BabyBear), number of rows (256), number of FRI queries (64), latency in milliseconds (~1236ms), and a note confirming the result is verifiable with open-source software without trusting the issuer.

## 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": {
  "ok": true,
  "nota": "prueba STARK real; verificable con el mismo software libre, sin confiar en el emisor",
  "campo": "BabyBear",
  "filas": 256,
  "latencia_ms": 1236.162942,
  "num_queries": 64
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/radhikachain-stark-proof-endpoint-394beadb/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)