Barker Stablecoin Yield
OfficialServer Configuration
Describes the environment variables required to run the server.
| Name | Required | Description | Default |
|---|---|---|---|
| BARKER_API_BASE | No | Optional base URL for the Barker API when self-hosting the stdio server. Defaults to the hosted API if not set. |
Instructions
Guidance the server publishes about itself, which clients place ahead of the tool catalog so the model reads it before choosing anything.
This server publishes no instructions, or was last inspected before Glama recorded them.
Capabilities
Features and capabilities supported by this server
Protocol revision2025-11-25
| Capability | Details |
|---|---|
| tools | {} |
Tools
Functions exposed to the LLM to take actions
| Name | Description |
|---|---|
| barker_defi_vaultsA | Query real-time stablecoin supply yield pools from Barker's index of 500+ DeFi protocols. Returns ranked rows with protocol_name, chain_name, asset_symbol, supply_apy_total (decimal — multiply by 100 for %), and supply_tvl (USD). Use for questions like 'best stablecoin yield', 'where to earn on USDC', 'compare lending rates', '稳定币利率'. |
| barker_market_overviewA | Stablecoin market snapshot: total market cap, yield-bearing cap, asset distribution, chain distribution. Use for 'stablecoin market cap', 'USDT market share', '稳定币市场份额'. share_pct fields are decimals (0.425 = 42.5%). |
| barker_market_trendA | Historical APY trend for stablecoins vs. US Treasury benchmark over a lookback window (7–180 days). Use for 'DeFi vs treasury', 'is stablecoin APY going up', 'crypto yield trend', '稳定币利率走势'. |
| barker_agent_payment_statsA | Agent-economy payment metrics from Barker's cross-protocol index. x402 (Base) is on-chain verifiable; Virtuals ACP, Google AP2, Stripe-Tempo MPP, OKX MPP, and Mastercard AP4M are self-reported claims. Separates real vs nominal volume by filtering out wash/noise sellers (avg_tx_usd < $0.02 with a very high tx-per-buyer ratio). Three views: 'summary' (hero KPIs + cross-protocol comparison table), 'trend' (daily tx / nominal & real volume / buyers), 'leaderboard' (top x402 sellers/endpoints by revenue). Use for 'x402 volume', 'agent payment stats', 'agent economy metrics', 'how big is x402', 'top x402 sellers', 'real vs nominal agent GMV', '智能体支付', 'x402 交易量'. All *_share_pct and noise_share_pct fields are percentages (77.0 = 77%); volume fields are USD. |
Prompts
Interactive templates invoked by user choice
| Name | Description |
|---|---|
No prompts | |
Resources
Contextual data attached and managed by the client
| Name | Description |
|---|---|
No resources | |
TDQS
Scored across 4 tools
Three tools focus on stablecoin yield and market data, while the fourth (agent payment stats) addresses a completely different domain, causing confusion. Within the stablecoin tools, purposes are distinct.
All tools use the 'barker_' prefix and snake_case, but naming patterns are inconsistent: some are noun-noun (market_overview, market_trend) while others are modifier-noun (defi_vaults, agent_payment_stats). No verb-noun pattern.
4 tools is a reasonable number for a focused server, avoiding bloat while covering core queries. Not over- or under-scoped.
The stablecoin yield domain is partially covered (vaults, overview, trends) but lacks tools for specific asset comparisons or protocol details. The inclusion of an unrelated agent payment tool creates a dead end and dilutes focus.