Secure API Calls

Secure API Calls with Keychains

keychains.dev is a credential proxy for AI agents. Instead of real API keys and OAuth tokens, you use placeholders like {{OAUTH2_ACCESS_TOKEN}}. Keychains injects the real credentials server-side — your agent never sees them.

Quick Start

Install:

npm install -g keychains@0.0.13

Basic usage:

keychains curl https://api.github.com/user/repos \
  -H "Authorization: Bearer {{OAUTH2_ACCESS_TOKEN}}"

Examples

• "List GitHub repos: keychains curl https://api.github.com/user/repos -H 'Authorization: Bearer {{OAUTH2_ACCESS_TOKEN}}'"
• "Send Slack message: keychains curl https://slack.com/api/chat.postMessage -X POST -H 'Authorization: Bearer {{OAUTH2_ACCESS_TOKEN}}' -H 'Content-Type: application/json' -d '{\"channel\":\"#general\",\"text\":\"Hello!\"}'"
• "List Stripe customers: keychains curl https://api.stripe.com/v1/customers?limit=5 -H 'Authorization: Bearer {{STRIPE_SECRET_KEY}}'"
• "Read Gmail: keychains curl 'https://gmail.googleapis.com/gmail/v1/users/me/messages?maxResults=10' -H 'Authorization: Bearer {{OAUTH2_ACCESS_TOKEN}}'"

How It Works

1. Use keychains curl instead of curl. Put {{PLACEHOLDER}} where the credential goes.
2. First time, keychains returns an approval link instead of the API response.
3. Show the link to the user. They approve via FaceID/Passkey and connect their account.
4. Replay the command — it works. All future requests to that provider succeed instantly.

No credentials ever pass through the agent. The user controls everything from keychains.dev/dashboard.

Setup Requirements

• Node.js (v16+) — needed for npm install -g keychains@0.0.13
• No API keys or environment variables needed
• Machine registration is automatic on first run (creates ~/.keychains/ with an Ed25519 SSH keypair)

Template Variables

Put {{VARIABLE_NAME}} where you'd normally put the real credential — in headers, body, or query params.

Keychains auto-detects the provider from the URL.

Waiting for User Approval

When keychains returns an approval link, show it to the user and poll:

keychains curl https://api.github.com/user/repos \
  -H "Authorization: Bearer {{OAUTH2_ACCESS_TOKEN}}"
# → "Authorize at: https://keychains.dev/approve/abc123xyz"

keychains wait https://keychains.dev/approve/abc123xyz --timeout 800

keychains curl https://api.github.com/user/repos \
  -H "Authorization: Bearer {{OAUTH2_ACCESS_TOKEN}}"
# → works now

TypeScript Machine SDK

For TypeScript/Node.js agents, @keychains/machine-sdk provides keychainsFetch() — a drop-in fetch() replacement with the same automatic registration and credential handling as the CLI.

npm install @keychains/machine-sdk

import { keychainsFetch, KeychainsError } from '@keychains/machine-sdk';

try {
  const res = await keychainsFetch('https://api.github.com/user/repos', {
    headers: { Authorization: 'Bearer {{OAUTH2_ACCESS_TOKEN}}' },
  });
  console.log(await res.json());
} catch (err) {
  if (err instanceof KeychainsError && err.approvalUrl) {
    console.log('Please approve:', err.approvalUrl);
  }
}

Other Available SDKs

Security & Data Flow

Full details: security whitepaper · privacy policy · terms of service

How proxying works: Your request (URL, headers, body) is routed through keychains.dev. The proxy replaces {{PLACEHOLDER}} variables with real credentials from the user's vault, forwards to the upstream API, and returns the response as-is. The proxy does not store or modify the response body.

Credential encryption: AES-256-GCM at rest. Only decrypted in memory at proxy time. Auto-deleted 90 days after last use. Never sold or shared.

Audit log: Every proxied request is logged (URL, method, provider, timestamp, status code). Archived to AWS S3 with Object Lock — immutable, tamper-proof. Configurable retention (30 days–3 years). Request/response bodies and credential values are never logged.

Local keys: On first run, an Ed25519 SSH keypair is generated in ~/.keychains/ (private key: 0600 permissions, never leaves the machine). Used for machine auth via SSH challenge-response. Rotate anytime with keychains machine rotate-keys.

Credential isolation: Real credentials live only in the user's vault on keychains.dev. Never sent to the agent. Bound to their provider (a GitHub token can only go to github.com).

Infrastructure: Vercel (app), Upstash Redis (ephemeral state), MongoDB Atlas (persistent, encrypted), AWS S3 (audit archival). All under data processing agreements.

User control: Biometric approval required for every credential use. Instant revocation per machine, provider, or agent. Full data export (JSON), account deletion, GDPR/CCPA compliant. No tracking, no ads, no data sales.

Troubleshooting

Got an approval link? Normal. Show it to the user, wait for approval, retry.

Template variable not replaced? You're using regular curl/fetch instead of keychains curl / keychainsFetch().

Resources

• keychains.dev — Website & docs
• keychains.dev/dashboard — Dashboard & audit trail
• github.com/interagentic/keychains.dev_skill — Source code

Compatible with 5545+ Providers (and counting)

Tested with the following providers so far:

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