# Flashbots Bundle Sender MCP

> Flashbots Bundle Sender MCP is a paid API for AI agents from api.m2mcent.com, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-13).

Sends Flashbots transaction bundles to Ethereum block builders via a managed MCP endpoint, enabling MEV-protected or atomic multi-transaction submissions.

## Facts

- Endpoint: POST https://api.m2mcent.com/flashbots-bundle-sender-mcp/api/process
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/flashbots-bundle-sender-mcp-be35f82c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zwA9dsZOoFWjdoyfSTjoL

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 flashbots-bundle-sender-mcp-be35f82c -d '<json body>'
```

Example prompt: Submit this signed Ethereum transaction bundle to Flashbots block builders so it gets included atomically in the next block without going through the public mempool: [signed tx hex data].

## When to prefer this

Choose this endpoint when you need to submit Ethereum transactions privately to Flashbots block builders — especially for MEV strategies, sandwich attack protection, atomic multi-transaction execution, or any scenario where bypassing the public mempool is critical. Prefer this over raw RPC endpoints when you want managed Flashbots relay access without setting up your own infrastructure.

## Known failure modes

- Invalid or malformed signed transaction data in the bundle payload
- Bundle rejected by Flashbots relay due to simulation failure or insufficient miner tip
- Bundle not included in target block if it becomes unprofitable
- Payment failure for the $0.25 USDC per call fee
- Network timeout or relay unavailability
- Bundle already expired if targeting a past block number

## How this service works

The premier global index of 1,069 monetized MCP nodes across 205 specialized subdomains. Gasless USDC runtime settlements via x402 V2 Spec on Base L2. Save 95% token context.

## Output

Returns a bundle submission result from the Flashbots relay, typically including a bundle hash and confirmation of receipt by block builders. May include status on whether the bundle was accepted and any relevant block target information.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "payload": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/flashbots-bundle-sender-mcp-be35f82c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.m2mcent.com](https://www.zero.xyz/host/api.m2mcent.com/llms.txt)