UnFee (unfee.xyz) MCP server

• Registry namexyz.unfee/mcpverified in the MCP registry

The registry name sits under unfee.xyz. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-29
• Tools14
• Server calls itselfunfee-mcp
• Server version1.3.0
• Protocol version2024-11-05

On 2026-10-29 the server answered initialize and tools/list without a sign-in. First answer in 132 ms.

• Answered on only 1 of 7 daily checks.
• Whether its tools do the product's job has not been judged yet.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP score49 of 100answers 14 · definitions 82 · context 100 · connects 100 · lowered by the warning signs below
• Answered14% of days1 of 7 daily checks
• Median first answer233 ms
• Space in an agent's context≈ 2,401 tokensthe definitions of all its tools (14), which an agent carries on every turn
• Tool definitionsB · 82 of 100
• Typed results0 of 14 toolsdeclared outputSchema: results come typed, read once

• Parameters without a description: in 3 of 14
• Not saying whether it only reads or can destroy: 12 of 14

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• create_payment_link

  Create a zero-middleman-fee UnFee payment short link (/to/<wallet>/<amount>/<currency>), hosted checkout URL, dynamic OpenGraph social preview card, scannable SVG QR code, and 1-line HTML embed snippet for Base (USDC, ETH, cbBTC, EURC) or…

• get_instant_free_rpc_key

  Mint a live UnFee API key with Free Tier credits (flat 1 request = 1 credit across eth_call, eth_getLogs, and XRPL JSON-RPC; 0 compute-unit multipliers).

• compare_payment_fees

  Compare legacy card processor fees (2.9% + $0.30) against UnFee Starter ($0/mo, 0.005% = 5¢ per $1,000 micro-fee) and UnFee Indie ($5/mo, True 0% protocol fee).

• get_live_arb_opportunities

  Scan all 9 live Base Mainnet 3-hop triangular flash-loan arbitrage loops (cbXRP, AERO, EURC, cbBTC, VIRTUAL, BRETT, DEGEN, MORPHO, WELL) and XRPL CLOB spreads.

• verify_transaction

  Verify an on-chain Base Mainnet or XRPL transaction hash and return settlement confirmation details.

• unfee_check_seller_reputation

  Check a seller or x402 API provider on-chain/gateway Proof-of-Delivery reputation (verified HTTP-200 deliveries, dropped failed calls, delivery rate %, and buyer USD saved on failed calls).

• unfee_pay_with_delivery_proof

  Execute an atomic HTTP-200 Proof-of-Delivery x402 settlement check: settles payment ONLY if the seller returns HTTP 200..299 with a valid non-empty payload and matching SHA-256 digest; drops authorization with $0.00 buyer charge if…

• unfee_generate_tax_report

  Generate an instant read-only IRS Form 8949, Schedule D summary, HIFO/FIFO/LIFO cost-basis calculation, non-taxable self-transfer matching, instant email CSV delivery (POST /api/v1/tax/email-export & POST /api/v1/tax/email-report), and…

• base_rpc_request

  Execute any Base Mainnet (Chain ID 8453) JSON-RPC method (eth_call, eth_getLogs, eth_getBalance, eth_estimateGas, eth_sendRawTransaction, eth_blockNumber) at a flat 1 Request = 1 Credit (250,000 free calls/month, zero compute-unit…

• eth_getLogs_flat_rate

  Query Base Mainnet (8453) or Ethereum Mainnet (1) eth_getLogs event logs at 1 flat credit per request (saving 75x–500x vs. legacy compute-unit RPC gateways that charge 75–500 CUs per eth_getLogs call).

• xrpl_rpc_request

  Execute any native XRP Ledger (XRPL Mainnet) JSON-RPC method (account_info, book_offers, server_info, tx, submit, account_lines) at 1 flat credit per request with zero compute-unit markups.

• ethereum_rpc_request

  Execute any Ethereum Mainnet (Chain ID 1) JSON-RPC method (eth_call, eth_getLogs, eth_getBalance, eth_blockNumber, eth_estimateGas) at 1 flat credit per request (250,000 free calls/month).

• unfee_trace_x402_wash_filter

  Run UnFee Trace (https://unfee.xyz/trace) on any Base (8453), Ethereum (1), or XRPL wallet or x402 facilitator to separate verified organic x402 end-user spend from circular agent-to-agent 24h ping-pong wash traffic, self-loops, and…

• unfee_address_guard

  Pre-send address-poisoning & vanity prefix/suffix lookalike spoofing guard for Base (8453), Ethereum (1), and XRPL wallets. Detects attackers matching the first 3-6 and last 3-6 hex characters of a trusted counterparty while middle bytes…