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.
/api/gov/senate-votesPAYMENT-SIGNATURE.The senate votes API is a pay-per-call gov endpoint built for AI agents and autonomous software. US Senate roll-call votes, newest first by vote date.
There is no signup and no API key. An agent (or any HTTP client) hits the endpoint, receives an x402 "402 Payment Required" challenge, signs a sub-cent USDC payment on Base or Solana, and retries — the data comes back on the paid request. That makes it a drop-in senate votes data source for an agent tool-use loop, an MCP host, or a backend that needs gov data on demand without onboarding to yet another vendor portal.
| 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 |
# 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'
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)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)// 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
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object | |
meta | object |
{
"ok": true,
"items": [
{
"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"
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
},
"meta": {
"query": {
"congress": 1,
"session": 1,
"result": "example",
"document": "example",
"since": "example",
"until": "example",
"limit": 1,
"offset": 1
},
"nextOffset": 1,
"previousOffset": 1
}
}