CryptoTaxEdge MCP Server

US tax classification for on-chain transactions, as an MCP server. Submit transaction hashes and get back the canonical event category, the US tax treatment with cited authority, a calibrated confidence score, an explicit route-to-review flag on uncertain rows, and per-leg breakdowns with counterparty identification. 80+ chains, including Ethereum, the major L2s, and Solana.

This is a remote MCP server — nothing to install or run locally.

• Endpoint: https://mcp.cryptotaxedge.com/ (streamable HTTP, JSON-RPC 2.0)
• Auth: Authorization: Bearer YOUR_API_KEY — free self-serve Developer key (no card) at dashboard.cryptotaxedge.com under Settings → API Keys
• Docs: dashboard.cryptotaxedge.com/api
• Site: cryptotaxedge.com

What it returns

Every classification carries the reliability envelope:

Field	Meaning
category	Canonical event type (swap, liquidity_add, reward, bridge, ...)
treatment	Closed enum: disposal, income, non_taxable, expense, needs_review
taxable	true, false, or null — null always travels with needs_review: true
confidence	Routing signal: how strongly independent evidence agreed
needs_review	The honesty contract — uncertain rows are flagged, never guessed
grey_area	On contested treatments (LP, wrap, liquid staking): the position not taken
assets	Per-leg sent/received breakdown with counterparties

Plain transfers, approvals, spam, failed and unsupported transactions, and every repeat come back fully identified at no charge.

Try it

List the tools:

curl -X POST https://mcp.cryptotaxedge.com/ \
  -H "Authorization: Bearer $CTE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

Classify a batch (up to 100 per call):

curl -X POST https://mcp.cryptotaxedge.com/ \
  -H "Authorization: Bearer $CTE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"classify_batch","arguments":{"transactions":[{"tx_id":"row_1","tx_hash":"0x...","chain":"ethereum"}]}}}'

The same engine is available over plain REST — see the API docs and the developer quickstart.

Registry manifest

server.json — published to the official MCP Registry as io.github.sturs49/cryptotaxedge.

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Classifications are informational only, not tax advice. Verify results with a qualified tax professional before filing.