Point-in-time (vintage) economic data from FRED's ALFRED archive — what an economic figure was AS FIRST REPORTED / as known on a past date, before later revisions. Give a seriesId (e.g. GDP, GDPC1, PAYEMS, INDPRO) and an asOf date to get the observations exactly as they stood on that date; omit asOf to get the current (latest-revised) values. Also returns the series' vintage (revision) dates — every date the series was revised. Free, public-domain (FRED). Critical for honest backtesting and macro research: it eliminates look-ahead bias (e.g. GDP for 2020Q1 was first reported far lower than today's revised figure). No LLM and no real-time API gives this — it's the archived state of the data through time. Pair with econ.fred (current series) and econ.fred-releases (release calendar).
/api/econ/fred-vintagePAYMENT-SIGNATURE.The fred vintage API is a pay-per-call econ endpoint built for AI agents and autonomous software. Point-in-time (vintage) economic data from FRED's ALFRED archive — what an economic figure was AS FIRST REPORTED / as known on a past date, before later revisions.
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 fred vintage data source for an agent tool-use loop, an MCP host, or a backend that needs econ data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
seriesIdrequired | string | min 1 chars · max 60 chars |
asOf | string | match ^\d{4}-\d{2}-\d{2}$ |
start | string | match ^\d{4}-\d{2}-\d{2}$ |
end | string | match ^\d{4}-\d{2}-\d{2}$ |
limit | integer | min 1 · max 100 |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/econ/fred-vintage?seriesId=example&asOf=2024-01-01&start=2024-01-01&end=2024-01-01&limit=1' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/econ/fred-vintage?seriesId=example&asOf=2024-01-01&start=2024-01-01&end=2024-01-01&limit=1' \ -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/econ/fred-vintage?seriesId=example&asOf=2024-01-01&start=2024-01-01&end=2024-01-01&limit=1'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.econ.fredVintage({
"seriesId": "example",
"asOf": "2024-01-01",
"start": "2024-01-01",
"end": "2024-01-01",
"limit": 1
})
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.econ.fred_vintage(seriesId="example", asOf="2024-01-01", start="2024-01-01", end="2024-01-01", limit=1)
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": "econ.fred-vintage",
"arguments": {
"seriesId": "example",
"asOf": "2024-01-01",
"start": "2024-01-01",
"end": "2024-01-01",
"limit": 1
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object |
{
"ok": true,
"items": [
{
"seriesId": "example",
"title": "example",
"units": "example",
"asOf": "example",
"vintageDates": [
"example"
],
"observations": [
{
"date": "example",
"value": 1
}
]
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
}
}