# RadhikaChain ZK Fold — Nova Proof Folding Endpoint

> RadhikaChain ZK Fold — Nova Proof Folding Endpoint is a paid API for AI agents from x402.radhikatmosphere.com, paid per call via x402, $6.032/call, status unknown (last checked 2026-09-14).

Executes a Nova-based recursive proof folding computation on BN256/Grumpkin curves and returns a live constant-size proof with step count and final state hash

## Facts

- Endpoint: GET https://x402.radhikatmosphere.com/zk/fold
- Price: $6.032/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/radhikachain-zk-fold-nova-proof-folding-endpoint-96b8ba5f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5BA3-gOntAUAhW0sIDSTH

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-fold-nova-proof-folding-endpoint-96b8ba5f
```

Example prompt: Run a live Nova proof folding computation on BN256/Grumpkin curves and show me the step count, final state hash, and proof that it stays constant-size no matter how many steps you fold.

## When to prefer this

Choose this endpoint when you need an on-demand, live Nova recursive proof folding execution on BN256/Grumpkin curves with a verifiable final state hash — particularly when you need to demonstrate or audit the constant-size proof property (that verification time is the same for 4 or 4000 steps). Prefer this over precomputed ZK services when freshness and liveness of computation matter. Best suited for pay-per-use scenarios where no account or subscription is desired.

## Known failure modes

- Missing or invalid x402 USDC payment header returns 402 Payment Required
- Insufficient payment amount (must be exactly $1.16 USDC on Base chain) causes rejection
- Network issues with Base chain payment settlement may cause timeout
- Malformed request headers may return 400 Bad Request
- Service unavailability returns 503

## 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 with ok status, a note confirming the fold was executed live (not precomputed), the number of folding steps performed, the curve pair used (BN256/Grumpkin), a description of the constant-size proof property, and the final state hash as a hex string.

## 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": "plegado ejecutado en esta peticion, no una cifra precalculada",
  "pasos": 4,
  "curvas": "BN256 / Grumpkin",
  "propiedad": "prueba de tamano constante: 4 pasos o 4000 se verifican igual de rapido",
  "estado_final": "0x0000000000000000000000000000000000000000000000000de0c0b4ccfc8eba"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/radhikachain-zk-fold-nova-proof-folding-endpoint-96b8ba5f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.radhikatmosphere.com](https://www.zero.xyz/host/x402.radhikatmosphere.com/llms.txt)