bls.series

US Bureau of Labor Statistics time-series data. Pass seriesIds = comma-separated BLS series IDs (1-10 per call), optional startYear + endYear bracket (max 10 years). Each observation: year, period (M01-M12 monthly, Q01-Q04 quarterly, A01 annual, S01/S02 semiannual), periodName, value (verbatim string from BLS) + numericValue (parsed number), latest flag, footnote texts. Common series IDs: LNS14000000 (unemployment rate), CUUR0000SA0 (CPI-U all items), CES0000000001 (nonfarm employment), LNS11300000 (labor force participation). Unauthenticated upstream — ~25 queries/day per IP.

price

$0.0012 USDC per call

method

GET/api/bls/series

payment

x402 v2 · USDC on Base (EIP-3009) or Solana (SPL transfer)

auth

None. Sign the payment, retry with PAYMENT-SIGNATURE.

tier

Tier 0 — no paid upstream

Parameters

Name	Type	Description
`seriesIds`required	string	min 4 chars · max 400 chars
`startYear`	integer	min 1900 · max 2100
`endYear`	integer	min 1900 · max 2100

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/bls/series?seriesIds=xxxx&startYear=1900&endYear=1900'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/bls/series?seriesIds=xxxx&startYear=1900&endYear=1900' \
  -H 'PAYMENT-SIGNATURE: <base64-json-payload>'

# Or use the canonical runner (handles probe → sign → retry):
#   EVM_PRIVATE_KEY=0x... node --env-file=.env.local \
#     --experimental-strip-types scripts/x402-pay.ts \
#     'https://2s.io/api/bls/series?seriesIds=xxxx&startYear=1900&endYear=1900'

TypeScript / Node — @2sio/sdktypescript

import { TwoS } from '@2sio/sdk'

const client = new TwoS({
  privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})

const result = await client.bls.series({
  "seriesIds": "xxxx",
  "startYear": 1900,
  "endYear": 1900
})

console.log('endpoint:', result.endpoint)
console.log('cost:', result.costUsd, 'USDC')
console.log('tx:', result.settlement?.txHash)
console.log('data:', result.data)

Python — 2siopython

import os
from twosio import TwoS

client = TwoS(private_key=os.environ["EVM_PRIVATE_KEY"])

result = client.bls.series(seriesIds="xxxx", startYear=1900, endYear=1900)

print("endpoint:", result.endpoint)
print("cost:", result.cost_usd, "USDC")
print("tx:", (result.settlement or {}).get("tx_hash"))
print("data:", result.data)

MCP — Claude Desktop / AgentKit / any MCP hostjson

// 1. Add @2sio/mcp to your MCP host config (Claude Desktop example below).
//    EVM_PRIVATE_KEY funds x402 payments per call.

// claude_desktop_config.json
{
  "mcpServers": {
    "2sio": {
      "command": "npx",
      "args": ["-y", "@2sio/mcp"],
      "env": { "EVM_PRIVATE_KEY": "0x..." }
    }
  }
}

// 2. Once the server is running, agents call this tool via standard MCP:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "bls.series",
    "arguments": {
      "seriesIds": "xxxx",
      "startYear": 1900,
      "endYear": 1900
    }
  }
}

Response

Field	Type	Description
`query`	object
`status`	string
`series`	array
`source`	object

Example response datajson

{
  "query": {
    "seriesIds": [
      "example"
    ],
    "startYear": 1,
    "endYear": 1
  },
  "status": "example",
  "series": [
    {
      "seriesId": "example",
      "catalog": {},
      "observations": [
        {
          "year": "example",
          "period": "example",
          "periodName": "example",
          "value": "example",
          "numericValue": 1,
          "latest": false,
          "footnotes": [
            "example"
          ]
        }
      ]
    }
  ],
  "source": {
    "provider": "example",
    "url": "https://example.com",
    "license": "example"
  }
}

Discovery

/api/directory — full catalog of every endpoint
/openapi.json — OpenAPI 3.1 spec (per-op x-payment-info, x402Payment security)
/.well-known/x402 — machine-readable service descriptor for x402-aware crawlers
/.well-known/mcp/server-card.json — MCP SEP-1649 server card
/llms.txt — plain-text manifest for LLM ingestion

2s.io is x402-native. Every call is paid per-request from a USDC-funded EVM wallet on Base — no signup, no API keys, no monthly fees. Source code: github.com/2s-io/sdk.