Open a live TLS connection to a host and return its certificate. Give a host (and optional port, default 443). Returns the negotiated TLS protocol + cipher, whether the chain validates against system roots, and the leaf certificate's subject + issuer (CN/O/C), validity window (valid-from / valid-to), days until expiry + expired flag, serial number, SHA-256 fingerprint, Subject Alternative Names, and the chain length. A genuine network probe agents can't do from their sandbox — for cert-expiry monitoring, TLS audits, and verifying who issued a site's certificate. SSRF-guarded: the host must resolve to a public address. Self-signed and expired certs are reported (not rejected).
/api/tls/cert-infoPAYMENT-SIGNATURE.The cert info API is a pay-per-call tls endpoint built for AI agents and autonomous software. Open a live TLS connection to a host and return its certificate.
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 cert info data source for an agent tool-use loop, an MCP host, or a backend that needs tls data on demand without onboarding to yet another vendor portal.
| Name | Type | Description |
|---|---|---|
hostrequired | string | min 1 chars · max 253 chars |
port | integer | min 1 · max 65535 |
# 1. Probe with no auth → 402 envelope with PaymentRequirements curl -sS 'https://2s.io/api/tls/cert-info?host=example&port=443' # 2. Sign + retry with PAYMENT-SIGNATURE: curl -sS 'https://2s.io/api/tls/cert-info?host=example&port=443' \ -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/tls/cert-info?host=example&port=443'
import { TwoS } from '@2sio/sdk'
const client = new TwoS({
privateKey: process.env.EVM_PRIVATE_KEY as `0x${string}`,
})
const result = await client.tls.certInfo({
"host": "example",
"port": 443
})
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.tls.cert_info(host="example", port=443)
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": "tls.cert-info",
"arguments": {
"host": "example",
"port": 443
}
}
}| Field | Type | Description |
|---|---|---|
ok | boolean | one of: true |
items | array | |
total | integer | Total matching rows upstream; null when unknown. |
source | object |
{
"ok": true,
"items": [
{
"host": "example",
"port": 1,
"resolvedIp": "example",
"protocol": "example",
"cipher": {
"name": "example",
"version": "example"
},
"authorized": false,
"authorizationError": "example",
"certificate": {
"subject": {},
"issuer": {},
"validFrom": "example",
"validTo": "example",
"daysUntilExpiry": 1,
"expired": false,
"serialNumber": "example",
"fingerprintSha256": "example",
"subjectAltNames": [
"example"
],
"isCa": false
},
"chainLength": 1
}
],
"total": 1,
"source": {
"provider": "example",
"url": "example",
"license": "example"
}
}