> STAKR.space. Content reviewed 2026-09-28. Paid RPC is not available.

＋ AGENT RPC / PRODUCT PREVIEW

# Infrastructure.  
On an agent’s terms.

Discover an endpoint. Understand its price. Authorize access. Get a response. A preview of the next interface to STAKR infrastructure.

IN DEVELOPMENTPaid gateway not connected · endpoints and pricing to be confirmed

REQUEST LAB / LOCAL SIMULATION

## Walk through  
a paid request.

See the exchange without a wallet, a payment or a live RPC call.

Example RPC familyEVM · eth\_blockNumberSolana · getSlotCosmos · statusPayment protocol

● ● ●x402 / illustrative exchange

1.  01 Request
2.  02 Challenge
3.  03 Authorize
4.  04 Response

\# Local simulation — no network request
# Select a protocol and start the flow.

POST /rpc/evm
{"jsonrpc":"2.0","id":1,
 "method":"eth\_blockNumber","params":\[\]}

ILLUSTRATIVE DATA · NOT A PAYMENT SDK IMPLEMENTATION

＋ ONE GATEWAY / TWO ADAPTERS

## The protocol is a choice.  
The access is clear.

MPP and x402 are separate protocols. A client chooses one supported flow and keeps its challenge, authorization and receipt format consistent.

Proposed payment protocol support
| Exchange | x402 | MPP |
| --- | --- | --- |
| Challenge | `PAYMENT-REQUIRED` | `WWW-Authenticate: Payment` |
| Authorization | `PAYMENT-SIGNATURE` | `Authorization: Payment` |
| Receipt | `PAYMENT-RESPONSE` | `Payment-Receipt` |
| Reference | [x402 documentation ↗](https://docs.x402.org/) | [MPP documentation ↗](https://mpp.dev/) |

01 / DISCOVER

### Know what you’re calling.

A catalogue of verified networks, supported methods, limits and endpoint health.

02 / AUTHORIZE

### Set a spending boundary.

Published prices, client-side budgets and a selected payment protocol before executing a request.

03 / VERIFY

### Keep the receipt.

Request accounting, payment verification and a clear outcome when an upstream is unavailable.

## Building an agent?

Tell us the networks, methods and request volume you need.

[Discuss RPC access↗](https://stakr.space/contact/?topic=Agent%20RPC)