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xsignal MCP Server

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⚡ xsignal

Pay-per-call data ingredients for AI agents on Base, via x402 (USDC). The flagship is the one thing no other x402 signal does: get_intent abstains — it returns "no verdict" (and says so) when it isn't confident enough, instead of always answering and always charging. 3 free calls per wallet to try, then from $0.01. Verify-only: never signs or moves funds.

The tools (flagship first)

Tool / route

Price

What you get

get_preflight · GET /preflight?addr=0x…

$0.05

The composed Base preflight: fuses on-chain safety (SAFE/WATCH/AVOID + rug flags, via MainStreet) with momentum into one verdict — GO / CAUTION / AVOID. Safety gates momentum, so it never green-lights a token that can rug.

get_intent · GET /intent?addr=0x…&min_confidence=0.7

$0.01

An outcome-priced momentum verdict (gaining/fading) only if confidence clears your bar, else a calibrated abstain. Paid answers carry a keyless tamper-evidence receipt.

get_token_brief · GET /brief?addr=0x…

$0.05

A meal: fuses market intel + cited social signal into a "what is happening with $TOKEN now" brief.

get_signal · GET /signal?q=<topic>

$0.01

A scored (virality + freshness) and cited real-time X/social signal.

get_token_intel · GET /token?addr=0x…

$0.01

Base token market data (liquidity/volume/price/age/flow + flags). Best as an input to the brief.

POST /mcp

—

MCP (streamable-http): tools/list discovers the 5 tools; a tools/call returns an x402 payment pointer.

GET /health · /.well-known/mcp.json · /.well-known/agent-card.json · /skill.md

free

health + agent discovery + the installable skill (no data).

Related MCP server: Octodamus Market Intelligence

Try it free (3 calls per wallet)

Add ?wallet=0xYourAddress to any route for 3 free full results, so you can evaluate quality before paying. After 3, that wallet pays via x402.

curl "https://xsignal-production.up.railway.app/intent?addr=0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed&min_confidence=0.5&wallet=0xYourAddr"

Then run the example — a watchlist alerter that surfaces only the tokens confidently moving (and stays quiet on the rest):

WALLET=0xYourAddr node examples/watchlist-alerter.js

Pay with x402 (beyond the free probe)

The first post-probe request returns HTTP 402 with an accepts array (price in USDC, network base, payTo). Pay with x402-fetch/x402-axios and a funded Base wallet, resubmit with the X-PAYMENT header, get the result. /intent is pay-first: you pay, then get a verdict or an honest abstain.

Safety

We never sign or move funds. x402 means we receive USDC to payTo; payment is verify-only via a facilitator. Signals are scored from public X posts + public DEX data — verify before acting; not financial advice. Confidence is a mechanical heuristic, not a calibrated probability or a prediction.

Config (env)

Var

Purpose

XSIGNAL_PAYTO

address that receives USDC (public; no key). Default = the operator address.

XSIGNAL_PRICE_USD / XSIGNAL_BRIEF_PRICE_USD / XSIGNAL_INTENT_PRICE_USD

per-call prices (default 0.01 / 0.05 / 0.01)

XSIGNAL_PROBE_FREE

free probe calls per wallet (default 3)

X402_NETWORK / FACILITATOR_URL

base (mainnet CDP, needs CDP_API_KEY_ID/CDP_API_KEY_SECRET) or base-sepolia (keyless x402.org)

X_BEARER_TOKEN or XAI_API_KEY

live X/Grok source for get_signal (token intel + intent are keyless via DexScreener). No key → a labelled DEMO seed.

Run

npm start      # :4520
npm test       # full self-test suite (signal · tokenintel · brief · intent · x402 · sources · server)

Zero runtime deps for the core (plain Node >=18); @coinbase/x402 is used only for CDP-facilitator auth on mainnet.

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