# TensorFeed x402 Base Reader (npm · @tensorfeed/x402-base-mcp)

Read-only Base mainnet reader. Verifies x402 payment settlements + AFTA federation status.

- Trust score: 70/100 (medium)
- Change this week: +24
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `@tensorfeed/x402-base-mcp`: 70/100 (this document), [markdown](https://verifymcp.io/servers/ai-tensorfeed-x402-base-mcp/tensorfeed-x402-base-mcp.md), [page](https://verifymcp.io/servers/ai-tensorfeed-x402-base-mcp/tensorfeed-x402-base-mcp)

## Channel facts

- Registry: `npm`
- Package: `@tensorfeed/x402-base-mcp`
- Version: `0.2.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, 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 2026-08-03.

- **Supply Chain Security**: 87/100
  - No malware found by supply-chain analysis.
  - Only part of the dependency tree could be resolved (110 of 114), so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Only part of the dependency tree could be resolved (110 of 114), so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 67 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 77/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1097 tokens (~73/item across 15 items; 15 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 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.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add ai-tensorfeed-x402-base-mcp -- npx -y @tensorfeed/x402-base-mcp
```

### Codex

```bash
codex mcp add ai-tensorfeed-x402-base-mcp -- npx -y @tensorfeed/x402-base-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ai-tensorfeed-x402-base-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@tensorfeed/x402-base-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ai-tensorfeed-x402-base-mcp --command npx --arg -y --arg @tensorfeed/x402-base-mcp
```

### Hermes

```yaml
mcp_servers:
  ai-tensorfeed-x402-base-mcp:
    command: "npx"
    args: ["-y", "@tensorfeed/x402-base-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "ai-tensorfeed-x402-base-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@tensorfeed/x402-base-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-08-03 (score 70, +1)

No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-02 (score 69, +15)

- [security regression] Known CVEs: partial → unverified
- [security improvement] Malware scan: unverified → pass
- [security] Stability: Stability not yet verified: we do not have a sandbox capture of the MCP schema this version of the package serves yet.
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional regression] Dependency health: partial → unverified
- [functional improvement] Stability: unverified → 0.23
- [functional] First check of Schema quality: unverified

### 2026-08-01 (score 54, +26)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-31 (score 28, −18)

- [security regression] Malware scan: pass → unverified

### 2026-07-27 (score 46)

First indexed and scored.

## MCP tools (15)

### `balance` (~38 tokens)

Get ETH balance

Returns the native ETH balance of an address on Base mainnet.

Input parameters:

- `address` (string, required): EVM address (0x-prefixed, checksummed)

### `usdc_balance` (~47 tokens)

Get USDC balance

Returns the USDC balance of an address on Base mainnet (Circle native bridged USDC).

Input parameters:

- `address` (string, required): EVM address (0x-prefixed, checksummed)

### `block_number` (~18 tokens)

Get latest Base block number

Returns the latest block number on Base mainnet.

### `get_tx_receipt` (~52 tokens)

Get transaction receipt

Returns the receipt for a transaction on Base mainnet, including status, gas used, and a summary of emitted logs.

Input parameters:

- `tx_hash` (string, required): 32-byte tx hash (0x-prefixed)

### `call` (~64 tokens)

Read-only contract call

Performs an eth_call against a contract on Base mainnet. Read-only; never broadcasts a transaction.

Input parameters:

- `contract` (string, required): Contract address (0x-prefixed)
- `data` (string, required): ABI-encoded calldata (0x-prefixed hex, up to 64 KB)

### `recent_transfers` (~95 tokens)

Recent USDC transfers touching an address

Returns USDC Transfer events involving the given address over the last N blocks on Base mainnet. Direction filter: in, out, or both.

Input parameters:

- `address` (string, required): EVM address (0x-prefixed)
- `blocks_back` (number): How many blocks back to scan (1-10000, default 1000)
- `direction` (string): Filter to incoming, outgoing, or both (default both)

### `verify_x402_settlement` (~123 tokens)

Verify an x402 payment settlement on Base

Given a tx hash, expected recipient, and expected USDC amount, returns a structured verdict on whether the on-chain USDC Transfer event actually matches the claimed settlement. Use to independently verify any x402 payment receipt.

Input parameters:

- `expected_amount_usdc` (string|number, required): Expected USDC amount, e.g. "0.02" or 0.02
- `expected_recipient` (string, required): Expected payTo wallet (0x-prefixed, checksummed)
- `tx_hash` (string, required): 32-byte tx hash (0x-prefixed)

### `parse_x402_manifest` (~80 tokens)

Fetch and parse a publisher's x402 manifest

Fetches https://{domain}/.well-known/x402.json (or x402) and returns the structured manifest. Used to discover what an x402-paid publisher accepts (scheme, network, payTo, prices, paid endpoints).

Input parameters:

- `domain` (string, required): Bare hostname, e.g. "tensorfeed.ai" (no scheme or path)

### `usdc_recent_payments_to` (~80 tokens)

Recent USDC payments to an address

Returns USDC transfers TO the given address over the last N blocks on Base mainnet. A convenience wrapper for x402 merchants verifying incoming agent payments.

Input parameters:

- `address` (string, required): Recipient address (0x-prefixed)
- `blocks_back` (number): How many blocks back to scan (1-10000, default 1000)

### `probe_x402_endpoint` (~81 tokens)

Probe whether a URL is x402-paid

Performs a GET against an https URL and reports whether the response looks like a canonical x402-paid endpoint (HTTP 402 with a JSON body containing accepts[]). Read-only. Does not pay, does not broadcast.

Input parameters:

- `url` (string, required): Absolute https:// URL to probe (no http, no file, no IP; rejects localhost/private network targets)

### `decode_x402_payment_payload` (~100 tokens)

Decode an X-PAYMENT header payload

Decodes a base64-encoded X-PAYMENT header payload per the Coinbase x402 V2 spec. Returns the parsed scheme, network, x402Version, EIP-3009 authorization, and signature. Pure offline decode; no signature is verified and no network call is made.

Input parameters:

- `payload` (string, required): Base64-encoded X-PAYMENT header value (standard or URL-safe). Decoded size capped at 64 KB.

### `verify_afta_federation` (~65 tokens)

AFTA certification check for a domain

Calls TensorFeed's canonical AFTA certification endpoint for a domain. Returns a scored checklist of which Agent Fair-Trade Agreement tenets the domain's public surfaces satisfy. Read-only.

Input parameters:

- `domain` (string, required): Bare hostname, e.g. "tensorfeed.ai"

### `tf_payment_lookup` (~112 tokens)

Check if a tx was a USDC payment to TensorFeed

On-chain lookup: was this transaction hash a USDC payment to TensorFeed's canonical payment wallet (0x549c82e6bFC54bdaE9A2073744CBC2AF5D1FC6D1) on Base mainnet? Returns structured details if yes. For credit attribution and endpoint mapping, the paying agent should call https://tensorfeed.ai/api/payment/history with its bearer token.

Input parameters:

- `tx_hash` (string, required): 32-byte tx hash (0x-prefixed)

### `x402_publisher_health` (~85 tokens)

Health and uptime of an x402 publisher

Returns the latest x402 status snapshot for a given domain from TensorFeed's canonical hourly monitor: current outcome, latency, 24h/7d uptime, and the recent series of check results. Useful for agents picking which paid publisher to depend on.

Input parameters:

- `domain` (string, required): Bare hostname, e.g. "tensorfeed.ai" (no scheme or path)

### `afta_federation_members` (~57 tokens)

List confirmed AFTA federation members

Returns the canonical list of confirmed Agent Fair-Trade Agreement (AFTA) federation members as of this package version. Static curated list; chain through verify_afta_federation(domain) to confirm live cert posture per member.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/ai-tensorfeed-x402-base-mcp/tensorfeed-x402-base-mcp#diagnostics

## Score history

- 2026-08-03: 70
- 2026-08-02: 69
- 2026-08-01: 54
- 2026-07-31: 28
- 2026-07-29: 46
- 2026-07-28: 46
- 2026-07-27: 46

## Links

- npm package: https://www.npmjs.com/package/@tensorfeed/x402-base-mcp
- Socket report: https://socket.dev/npm/package/@tensorfeed/x402-base-mcp
- Repository: https://github.com/RipperMercs/tensorfeed-x402-base-mcp
- Website: https://tensorfeed.ai/x402
- Changelog RSS feed: https://verifymcp.io/servers/ai-tensorfeed-x402-base-mcp/tensorfeed-x402-base-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/ai-tensorfeed-x402-base-mcp/tensorfeed-x402-base-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/ai-tensorfeed-x402-base-mcp/tensorfeed-x402-base-mcp