Toolbooth
Pay-per-call tools for AI agents over x402. No signup, no API key — pay in USDC per request.
Webhook inbox $0.005 per inbox
Async APIs deliver results to a callback URL. Agents running in a sandbox or a chat session don't have one. Create an inbox, hand its callback_url to any async API, then poll or long-poll for the deliveries.
POST https://toolbooth.dev/v1/inboxes → 402, pay, retry
{"ttl_hours": 168}
← {"inbox_id", "callback_url", "token", "messages_url", "expires_at"}
POST {callback_url} (the async API delivers here, free)
GET {messages_url}?after=0&wait=20 Authorization: Bearer {token}
DELETE /v1/inboxes/{inbox_id} Authorization: Bearer {token}
Limits: 100 messages × 256 KB, up to 7 days. Payloads are stored as bytes and never parsed or executed. Cookie, authorization and client-IP headers are dropped.