LastLook Data

Financial market data for AI agents. Pay per query via x402 — no accounts, no API keys, no subscriptions.

LastLook Data provides Treasury yields, mortgage rates, benchmark rates, macro indicators, G10 FX rates, energy prices, and derived market signals via a simple REST API. Agents pay USDC per query using the x402 protocol on Base mainnet. Data is sourced from the Federal Reserve (FRED) and the European Central Bank (via Frankfurter).

Authentication

No API key required. All paid endpoints are protected by the x402 payment protocol. When you hit a paid endpoint without payment, the API returns HTTP 402 with a payment payload. Your client completes the x402 flow and retries — the data comes back on the retry.

1. 1.Request — your agent sends a GET request to any paid endpoint
2. 2.402 Response — the API returns HTTP 402 with a base64-encoded PAYMENT-REQUIRED header
3. 3.Pay and Retry — your agent pays via x402 and retries — the API returns the data

# First request returns 402
curl https://api.lastlookdata.com/api/treasury/current

# After x402 payment, retry with payment header
curl https://api.lastlookdata.com/api/treasury/current \
  -H "X-PAYMENT: <payment_token>"

Common Use Cases

The most frequent queries and the exact endpoints to use.

All current value queries cost $0.01 USDC. Use /api/series/30 for 30-day history ($0.05), /api/series/90 for 90-day history ($0.10), or /api/series/365 for full-year history ($0.25).

Treasury Endpoints

Returns the most recent 30-year US Treasury constant maturity yield (DGS30). No parameters.

{
  "service": "LastLook Data",
  "series": "DGS30 - 30-Year Treasury Constant Maturity Rate",
  "date": "2026-05-09",
  "yield_percent": 4.97,
  "note": "Source: Federal Reserve Bank of St. Louis (FRED)"
}

Returns the 30-year Treasury yield for a specific date. Business days only.

Returns the current 30-year Treasury yield. No payment required. Used for previews.

FRED Series Endpoints

Use these endpoints to retrieve current and historical values for any supported FRED series.

Returns the most recent value for any supported FRED series.

{
  "service": "LastLook Data",
  "series_id": "IORB",
  "label": "Interest on Reserve Balances",
  "date": "2026-05-09",
  "value": 4.40,
  "note": "Source: Federal Reserve Bank of St. Louis (FRED)"
}

Returns the value for any supported FRED series on a specific date. Business days only.

Last 30 days of observations for any supported FRED series.

{
  "service": "LastLook Data",
  "series_id": "MORTGAGE30US",
  "label": "30-Year Fixed Rate Mortgage Average",
  "days": 30,
  "count": 4,
  "start": "2026-04-10",
  "end": "2026-05-09",
  "observations": [
    { "date": "2026-04-10", "value": 6.82 },
    { "date": "2026-05-09", "value": 6.79 }
  ],
  "note": "Source: Federal Reserve Bank of St. Louis (FRED)"
}

Last 90 days of observations. Same response format as /api/series/30.

Last 365 days of observations. Same response format as /api/series/30.

Legacy endpoints /api/treasury/current and /api/treasury/date remain available for backward compatibility.

Derived Indicators

Computed and interpreted market signals built on FRED data — yield curve spreads, recession signals, Fed policy stance, and the upcoming economic release calendar.

Returns 2s10s (10Y minus 2Y) and 3m10y (10Y minus 3-Month T-Bill) Treasury spreads with an inversion signal. No parameters required.

Real-time Sahm Rule recession indicator. Value >= 0.50 means recession is likely underway. No parameters required.

Effective Fed funds rate (EFFR) minus interest on reserves (IORB), with plain-English interpretation. No parameters required.

Upcoming FRED economic data release dates — CPI, jobs, GDP, Treasury rates, and more.

FX Rate Endpoints

G10 currency pairs sourced from the European Central Bank via Frankfurter. Updates on business days.

Current exchange rate for a G10 currency pair.

{
  "service": "LastLook Data",
  "pair": "EURUSD",
  "label": "Euro / US Dollar",
  "date": "2026-05-09",
  "rate": 1.1245,
  "base": "EUR",
  "quote": "USD",
  "note": "Source: Frankfurter (European Central Bank)"
}

Returns the exchange rate for a G10 currency pair on a specific date.

{
  "service": "LastLook Data",
  "pair": "EURUSD",
  "label": "Euro / US Dollar",
  "date": "2026-05-09",
  "rate": 1.1245,
  "base": "EUR",
  "quote": "USD",
  "note": "Source: Frankfurter (European Central Bank)"
}

Historical daily exchange rates for a G10 currency pair.

Bundles

Bundle endpoints fetch all constituent series in parallel under a single x402 payment. One payment, multiple series, one structured response with values, computed derived fields, and interpreted signals.

{
  "service": "LastLook Data",
  "as_of": "2026-05-29",
  "bundle": "rate_environment",
  "series":  { "FEDFUNDS": 4.33, "DGS10": 4.46, ... },
  "derived": { "spread_2s10s": 0.52, "policy_spread": -0.07, ... },
  "signals": { "curve_shape": "Normal (upward sloping)", ... },
  "note": "Source: Federal Reserve Bank of St. Louis (FRED)"
}

Series: FEDFUNDS, SOFR, DGS2, DGS5, DGS10, DGS30.
Derived: spread_2s10s, spread_3m10y, policy_spread (EFFR minus IORB).
Signals: curve_shape, policy_stance.

Series: MORTGAGE30US, MORTGAGE15US, DGS10, FEDFUNDS, MSPUS, HOUST.
Derived: mbs_spread (30yr mortgage rate minus 10Y Treasury yield).
Signals: rate_trend_30d (rising / falling / flat).

Series: GDP, UNRATE, CPIAUCSL, CPILFESL, FEDFUNDS.
Derived: sahm_rule, spread_2s10s.
Signals: cycle_phase (expansion / late cycle / peak / contraction), recession_triggered.

Series: EURUSD, GBPUSD, USDJPY, USDCHF, USDCAD, AUDUSD, NZDUSD, USDSEK, USDNOK.
Derived: usd_strength_index (avg % change vs G10 basket vs 30 days ago, positive = stronger).
Signals: usd_trend_30d (strengthening / weakening / stable).

Series: DCOILWTICO, DCOILBRENTEU, GASREGCOVW, DHHNGSP.
Derived: wti_brent_spread (WTI minus Brent, USD/bbl).
Signals: wti_brent_signal.

15+ indicators across rates, inflation, employment, FX, and energy. Also returns a pre-formatted natural-language paragraph ready for LLM context injection, plus key FX rates.

"As of 2026-05-29: The Fed Funds Rate is 4.33%, yield curve at +52bps (normal),
 10Y Treasury at 4.46%, 30Y at 4.97%, CPI at 315.5, unemployment at 4.2%,
 30yr mortgage 6.86% (240bps over 10Y), WTI crude $61.50/bbl, Brent $64.80/bbl,
 EUR/USD 1.1345, USD/JPY 142.5, Sahm Rule 0.37 (below 0.50 threshold)."

MCP Integration

Connect LastLook Data to any MCP-compatible AI assistant.

LastLook Data exposes all endpoints as MCP tools via a public MCP server. Add the config below to your MCP client to get access to all 18 tools with no additional setup.

{
  "mcpServers": {
    "lastlook-data": {
      "type": "http",
      "url": "https://mcp.lastlookdata.com/mcp"
    }
  }
}

Payments are handled automatically by the MCP server when an agent has an x402-compatible wallet.

Data Catalog

Treasury Rates — Source: FRED, updates daily

Mortgage & Housing — Source: FRED

Benchmark Rates — Source: FRED, updates daily

Macro Indicators — Source: FRED

G10 FX Pairs — Source: European Central Bank, updates daily

EURUSD, GBPUSD, USDJPY, USDCHF, USDCAD, AUDUSD, NZDUSD, USDSEK, USDNOK

Energy Prices — Source: FRED