# Flow — Base quotes & contract safety for agents (remote · flow-kg4x.vercel.app)

Best-execution quotes and contract safety checks on Base for AI agents, paid per call via x402.

- Trust score: 77/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `flow-kg4x.vercel.app`: 77/100 (this document), [markdown](https://verifymcp.io/servers/flow-executor-flow/api-mcp.md), [page](https://verifymcp.io/servers/flow-executor-flow/api-mcp)

## Channel facts

- Endpoint: `https://flow-kg4x.vercel.app/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 4 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 69/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 707 tokens (~176/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 80/100
  - Stability observed for 24 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 4 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Flow — Base quotes & contract safety for agents MCP server?

Flow — Base quotes & contract safety for agents is a hosted endpoint at https://flow-kg4x.vercel.app/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http flow-executor-flow 'https://flow-kg4x.vercel.app/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "flow-executor-flow": {
      "url": "https://flow-kg4x.vercel.app/api/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "flow-executor-flow": {
      "type": "http",
      "url": "https://flow-kg4x.vercel.app/api/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.flow-executor-flow]
url = "https://flow-kg4x.vercel.app/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "flow-executor-flow": {
      "type": "remote",
      "url": "https://flow-kg4x.vercel.app/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add flow-executor-flow --url 'https://flow-kg4x.vercel.app/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  flow-executor-flow:
    url: "https://flow-kg4x.vercel.app/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "flow-executor-flow": {
      "Transport": "http",
      "Url": "https://flow-kg4x.vercel.app/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add flow-executor-flow -t streamable-http -u 'https://flow-kg4x.vercel.app/api/mcp'
```

### Other

```json
{
  "mcpServers": {
    "flow-executor-flow": {
      "type": "http",
      "url": "https://flow-kg4x.vercel.app/api/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 77, +1)

No change was recorded against any check on this day. Stability & Change Management went from 77 to 80. That category is still filling its 30-day observation window: 23 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-03 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 70 to 73. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 22 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 63 to 67. That category is still filling its 30-day observation window: 19 days of observed history at the previous scan, 20 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-29 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 53 to 57. That category is still filling its 30-day observation window: 16 days of observed history at the previous scan, 17 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-27 (score 73, +1)

No change was recorded against any check on this day. Stability & Change Management went from 47 to 50. That category is still filling its 30-day observation window: 14 days of observed history at the previous scan, 15 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-25 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 40 to 43. That category is still filling its 30-day observation window: 12 days of observed history at the previous scan, 13 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 71, +1)

- [security] Tool “flow_paycheck” rewrote its description, which is the text the model reads
- [functional improvement] Schema quality: 204 → 176
- [cosmetic] “flow_paycheck” dropped the optional parameter “amountUsd”

### 2026-10-22 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 30 to 33. That category is still filling its 30-day observation window: 9 days of observed history at the previous scan, 10 at this one. The score rises as the window fills, whether or not the server changes.

## MCP tools (4)

### `flow_quote` (~216 tokens)

Get a best-execution swap quote on Base. Compares Uniswap V3, PancakeSwap V3 and Aerodrome (plus two-hop routes via WETH), returns the winning venue, expected output, edge in bps vs the baseline, a liquidity flag (deep/watch/thin), the exact block number and timestamp, and build latency. Read-only: no funds move.

Input parameters:

- `amountIn` (string, required): Human-readable input amount, e.g. "10" for 10 USDC
- `chainId` (number): Chain id, defaults to 8453 (Base)
- `tokenIn` (string, required): Input token contract address on Base (e.g. USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA4E46E)
- `tokenOut` (string, required): Output token contract address on Base (e.g. WETH 0x4200000000000000000000000000000000000006)

### `flow_paycheck` (~239 tokens)

Before you pay this agent, check. PayCheck ($0.50 USDC via x402 on Base) runs Flow's whole checker stack on a payee in ONE call — the payee verdict (kind, on-chain activity, the full contract-safety engine when the payee is a contract), the wallet approval-exposure audit, contract safety, and the payee's recent USDC settlement history — and returns one finished grade (ALLOW / REVIEW / BLOCK with a 0-100 score), a verify_status (verified / failed / unverified_verifier_down), every check, the evidence under it, and a receipt. The guarantee: the report is produced before settlement; if it cannot be produced, the payment is never settled — no report, no charge. This hosted endpoint does not hold a wallet: an unpaid call returns the endpoint's x402 payment challenge itself, never an invented result. Pay it with any x402 client, or use the @flowexecutor/flow-mcp stdio package with an Early Builder Key.

Input parameters:

- `payee` (string, required): The payee address to grade before paying (0x…), Base

### `flow_search` (~227 tokens)

Verified Search ($0.01 USDC via x402 on Base): web search where every result is independently checked by Flow before it reaches you — the result URL is fetched live (liveness, final HTTP status recorded) and the fetched page text is matched against the result's own title/snippet terms (content-match score). Each result carries a verify_status (verified / failed / unverified_verifier_down), its httpStatus and contentMatch, and the response carries a receipt counting checked / verified / failed. Bad results are flagged, never silently dropped. The guarantee: the search is produced before settlement; if it cannot be produced, the payment is never settled. This hosted endpoint does not hold a wallet: an unpaid call returns the endpoint's x402 payment challenge itself, never an invented result. Pay it with any x402 client, or use the @flowexecutor/flow-mcp stdio package with an Early Builder Key.

Input parameters:

- `maxResults` (number): Max results to return and verify (default 5, cap 10)
- `query` (string, required): The search query

### `flow_health` (~25 tokens)

Check the Flow quote API health: status, chain, and latest synced block number.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/flow-executor-flow/api-mcp#diagnostics

## Score history

- 2026-11-05: 77
- 2026-11-04: 76
- 2026-11-03: 76
- 2026-11-02: 75
- 2026-11-01: 75
- 2026-10-31: 74
- 2026-10-30: 74
- 2026-10-29: 74
- 2026-10-28: 73
- 2026-10-27: 73
- 2026-10-26: 72
- 2026-10-25: 72
- 2026-10-24: 71
- 2026-10-23: 70
- 2026-10-22: 70
- 2026-10-21: 69
- 2026-10-20: 69
- 2026-10-19: 70
- 2026-10-18: 70
- 2026-10-17: 69
- 2026-10-16: 69
- 2026-10-15: 68
- 2026-10-14: 68
- 2026-10-13: 67
- 2026-10-12: 67

## Common questions

### What is the Flow — Base quotes & contract safety for agents MCP server?

Flow — Base quotes & contract safety for agents is an MCP server listed in the public MCP registry as io.github.flow-executor/flow. Best-execution quotes and contract safety checks on Base for AI agents, paid per call via x402. This page covers its hosted endpoint (https://flow-kg4x.vercel.app/api/mcp).

### Is the Flow — Base quotes & contract safety for agents MCP server safe to use?

Flow — Base quotes & contract safety for agents scores 77 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Flow — Base quotes & contract safety for agents MCP server expose?

Flow — Base quotes & contract safety for agents exposes 4 tools: flow_quote, flow_paycheck, flow_search, flow_health. Their descriptions and schemas cost roughly 707 tokens of context every time the server is loaded.

### Does the Flow — Base quotes & contract safety for agents MCP server require authentication?

No. We connected to Flow — Base quotes & contract safety for agents without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Flow — Base quotes & contract safety for agents MCP server still maintained?

Flow — Base quotes & contract safety for agents is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://flow-kg4x.vercel.app/api/mcp
- Repository: https://github.com/flow-executor/Flow
- Website: https://flow-kg4x.vercel.app/
- Changelog RSS feed: https://verifymcp.io/servers/flow-executor-flow/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/flow-executor-flow/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/flow-executor-flow/api-mcp