# RadhikaChain POI — Proof-of-Inclusion Endpoint

> RadhikaChain POI — Proof-of-Inclusion Endpoint is a paid API for AI agents from x402.radhikachain.xyz, paid per call via x402, $1.716/call, status unknown (last checked 2026-09-14).

Returns a Merkle proof-of-inclusion (root, height, and leaf count) for a given point of interest on the RadhikaChain verifiable computation layer, paid per-request via x402 USDC on Base.

## Facts

- Endpoint: POST https://x402.radhikachain.xyz/poi
- Price: $1.716/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/radhikachain-poi-proof-of-inclusion-endpoint-c7bc0ef1
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UoRvZewtw-y4d0MKZ3Ngm

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-poi-proof-of-inclusion-endpoint-c7bc0ef1 -d '<json body>'
```

Example prompt: Can you fetch a Merkle proof-of-inclusion from RadhikaChain for the current chain state — I need the tree root, block height, and leaf count to verify inclusion in the ZK layer?

## When to prefer this

Choose this endpoint when you need a cryptographic Merkle proof-of-inclusion from a ZK-based chain (Halo2/Nova/Plonky3) without requiring an account or subscription — ideal for one-off, pay-per-use inclusion verification. Prefer this over on-chain RPC calls when you want a compact, pre-computed verifiable proof rather than raw block data, and when you need trustless attestation compatible with ZK circuit pipelines.

## Known failure modes

- Payment failure: x402 payment not included or USDC balance insufficient — returns 402 Payment Required
- Invalid or malformed POST body — returns 400 Bad Request
- Chain data temporarily unavailable — returns 503 Service Unavailable
- Rate limiting if payment is valid but request volume is excessive
- Network timeout if ZK computation is delayed

## 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

A JSON object containing: `root` (hex-encoded Merkle root hash of the current ZK tree), `height` (current block height as an integer), and `leaves` (total number of leaves in the Merkle tree as an integer). This provides a compact, verifiable snapshot of chain inclusion state.

## 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": {
  "root": "e96b3eac15c5...",
  "height": 45058,
  "leaves": 2
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/radhikachain-poi-proof-of-inclusion-endpoint-c7bc0ef1/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)