gov.senate-votes

US Senate roll-call votes, newest first by vote date. Each record includes congress + session + vote_number, vote question + result + title + majority requirement, vote date/time, document name (e.g., S. 5, H.R. 4499), document title, grand totals (yeas/nays/present/absent), AND per-party breakdown (D/R/I yea/nay/present/absent counts derived from member-level vote_cast). Filters (all optional, AND-combined): congress, session (1 or 2), result substring, document substring (e.g., 'S. 5'), since/until (vote_date), limit + offset. Locally aggregated from senate.gov XML feeds (refreshed daily). Public-domain US government records.

price

$0.0024 USDC per call

method

GET/api/gov/senate-votes

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
`congress`	integer	Filter by Congress number. The 119th Congress = 2025-2026. min 100 · max 200
`session`	integer	Filter by session (1 = odd year, 2 = even year of a Congress).
`result`	string	Filter by vote result (case-insensitive substring). Examples: "Agreed", "Rejected", "Cloture". min 2 chars · max 60 chars
`document`	string	Filter by document name substring (case-insensitive on document_name). Examples: "S. 5", "H.R. 4499", "H.R.". min 2 chars · max 40 chars
`since`	string	Earliest vote date (YYYY-MM-DD). match ^\d{4}-\d{2}-\d{2}$
`until`	string	Latest vote date (YYYY-MM-DD). match ^\d{4}-\d{2}-\d{2}$
`limit`	integer	Max records (1-100). Default 25. min 1 · max 100
`offset`	integer	Offset for pagination. Default 0. min 0 · max 100000

Code samples

cURLbash

# 1. Probe with no auth → 402 envelope with PaymentRequirements
curl -sS 'https://2s.io/api/gov/senate-votes?congress=100&session=1&result=xx&document=xx&since=2024-01-01&until=2024-01-01&limit=25&offset=0'

# 2. Sign + retry with PAYMENT-SIGNATURE:
curl -sS 'https://2s.io/api/gov/senate-votes?congress=100&session=1&result=xx&document=xx&since=2024-01-01&until=2024-01-01&limit=25&offset=0' \
  -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/gov/senate-votes?congress=100&session=1&result=xx&document=xx&since=2024-01-01&until=2024-01-01&limit=25&offset=0'

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.gov.senateVotes({
  "congress": 100,
  "session": 1,
  "result": "xx",
  "document": "xx",
  "since": "2024-01-01",
  "until": "2024-01-01",
  "limit": 25,
  "offset": 0
})

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.gov.senate_votes(congress=100, session=1, result="xx", document="xx", since="2024-01-01", until="2024-01-01", limit=25, offset=0)

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": "gov.senate-votes",
    "arguments": {
      "congress": 100,
      "session": 1,
      "result": "xx",
      "document": "xx",
      "since": "2024-01-01",
      "until": "2024-01-01",
      "limit": 25,
      "offset": 0
    }
  }
}

Response

Field	Type	Description
`query`	object
`totalCount`	integer
`returned`	integer
`pagination`	object
`votes`	array
`source`	object

Example response datajson

{
  "query": {
    "congress": 1,
    "session": 1,
    "result": "example",
    "document": "example",
    "since": "example",
    "until": "example",
    "limit": 1,
    "offset": 1
  },
  "totalCount": 1,
  "returned": 1,
  "pagination": {
    "nextOffset": 1,
    "previousOffset": 1
  },
  "votes": [
    {
      "congress": 1,
      "session": 1,
      "voteNumber": 1,
      "congressYear": 1,
      "voteDate": "example",
      "voteTime": "example",
      "voteQuestion": "example",
      "voteResult": "example",
      "voteResultText": "example",
      "voteTitle": "example",
      "majorityRequirement": "example",
      "documentName": "example",
      "documentTitle": "example",
      "totals": {
        "yeas": 1,
        "nays": 1,
        "present": 1,
        "absent": 1
      },
      "totalsByParty": {},
      "sourceXmlUrl": "https://example.com"
    }
  ],
  "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.