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TensorFeed x402 Base Reader MCP server

by tensorfeed.ai·ai.tensorfeed/x402-base-mcp·v0.2.1·2 stars
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Read-only Base mainnet reader. Verifies x402 payment settlements + AFTA federation status.

B74/100grade B
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B74/100

full report

Adoption
Growing

2 stars65 downloads/wk

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TensorFeed x402 Base Reader tools (15)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • 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.

  • balance

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

  • block_number

    Returns the latest block number on Base mainnet.

  • call

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

  • decode_x402_payment_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.

  • get_tx_receipt

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

  • parse_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).

  • probe_x402_endpoint

    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.

  • recent_transfers

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

  • tf_payment_lookup

    On-chain lookup: was this transaction hash a USDC payment to TensorFeed's canonical payment wallet (…) 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.

  • usdc_balance

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

  • usdc_recent_payments_to

    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.

  • verify_afta_federation

    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.

  • verify_x402_settlement

    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.

  • x402_publisher_health

    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.

Public scan report

scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings
  • Code scan27 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 47 days ago12/15
  • Maintainer identitynamespace and repository owner differ; website matches verified namespace5/10
Overall 74/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How TensorFeed x402 Base Reader compares

Against every graded Finance MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
74/100
higher than 48% of 1,761 Finance servers
Tools
15
the typical Finance server has 8
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
2
more than 80% of 946 Finance servers
Downloads a week
65
more than 57% of 421 Finance servers with a package

What its tools let an agent do: 15 read

Install TensorFeed x402 Base Reader in Claude Code, Cursor or VS Code

Runs npx -y @tensorfeed/x402-base-mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add x402-base-mcp -- npx -y @tensorfeed/x402-base-mcp
Add to Cursor

What the publisher says

From the TensorFeed x402 Base Reader repository's README, as published. We do not edit it. Read it on GitHub

@tensorfeed/x402-base-mcp

Read-only MCP server for verifying x402 USDC settlements on Base mainnet. Drop it into any MCP-compatible agent (Claude Desktop, Claude Code, Cursor, ChatGPT) to independently audit x402 payment receipts on-chain, parse publisher .well-known/x402 manifests, and check AFTA federation status. No private keys, no signing, no broadcasts.

npm install -g @tensorfeed/x402-base-mcp

Relationship to Coinbase Base MCP

Coinbase shipped Base MCP (the official mcp.base.org server, launched May 2026) as the transact-side MCP: it connects an agent to a Base Account and lets the agent propose swaps, transfers, and x402 payments that the user approves in-wallet.

This package, @tensorfeed/x402-base-mcp, is the verify-side MCP. Once an x402 payment has been made (by Base MCP, by a server-side @coinbase/x402 middleware, or by any other x402 client), this server lets the calling agent independently check the on-chain settlement, parse the publisher's /.well-known/x402 manifest, and audit the receipt. Read-only chain visibility, no wallet.

The two are complementary, not competing. Use Base MCP to pay. Use this MCP to verify.

Why a separate verify MCP

x402 is a payment protocol where agents pay merchants in USDC on Base for paid API responses. When an agent receives a payment receipt back, it has two options for confirming that the settlement actually happened the way the receipt claims:

  1. Trust the merchant
  2. Read the on-chain Transfer event itself

Most existing EVM MCP servers either require a private key (so the agent can also send transactions, which is operationally risky and unnecessary for verification), or are generic multi-chain readers that don't speak x402. This server is the read-only, x402-aware option. Drop it into a Claude Desktop or Claude Code session and any agent can verify x402 payments without operating a wallet.

The TensorFeed-flavor tools (verifyaftafederation, tfpaymentlookup) compose the same primitives against TF's canonical surfaces and demonstrate the pattern. Use them or ignore them; the generic tools work fine on their own.

Installation

Claude Desktop

Add to claudedesktopconfig.json:

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

Claude Code

claude mcp add tensorfeed-x402-base -- npx -y @tensorfeed/x402-base-mcp

Optional: bring your own RPC

The server defaults to the public Base RPC (https://mainnet.base.org), which is fine for casual use. For heavier workloads, set an Alchemy or Infura URL via TENSORFEEDRPCURL. The URL must match the allowlist in src/rpc/allowlist.ts; anything else falls back to the public endpoint and logs a warning to stderr.

export TENSORFEED_RPC_URL="https://base-mainnet.g.alchemy.com/v2/YOUR_KEY"

Affiliate links if you don't already have an account:

  • Alchemy: https://www.alchemy.com/
  • Infura: https://www.infura.io/

Tools

Generic Base reads

x402-native verification

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

TensorFeed x402 Base Reader: common questions

Is TensorFeed x402 Base Reader MCP server safe?
Mostly: it is graded B (74/100). Read the TensorFeed x402 Base Reader safety report
How do I install TensorFeed x402 Base Reader?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does TensorFeed x402 Base Reader need an API key?
Yes. The registry entry asks for TENSORFEED_RPC_URL.
Is TensorFeed x402 Base Reader maintained?
The last commit was 84 days ago (2026-08-12). The latest release is v0.2.1.
What can I use instead of TensorFeed x402 Base Reader?
Servers from other publishers that do the same job: three.ws Agent Payments MCP server, X402 List MCP server and Pulsefeed X402 MCP server. Compare all TensorFeed x402 Base Reader alternatives.
How does TensorFeed x402 Base Reader compare with other Finance MCP servers?
safety score 74/100 (higher than 48% of 1,761 Finance servers); tools 15 (the typical Finance server has 8); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to TensorFeed x402 Base Reader

Same job from other publishers: the closest match first, then the best rated.

All TensorFeed x402 Base Reader alternatives →
  • three.ws Agent Payments
    Governed x402 payment sessions: pay any endpoint with budget, allowlist & per-tx caps, no key.
    More from nirholas →
    B
  • X402 List
    Find and vet x402 payment APIs before your agent pays one: uptime, price, on-chain volume.
    A
  • Pulsefeed X402
    Verify x402 payment endpoints before an AI agent pays: scam scan, on-chain checks, trust scores.
    A
  • Blockrun
    Web search, deep research, prediction markets & crypto data for AI agents. Pay per call via x402.
    B
  • Agent402.Tools: pay-per-call web tools
    Agentic Finance: 500+ agent tools, multi-chain USDC over x402 or MPP, or free via proof-of-work
    A