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2s PubSub Subscribe
x402
2s PubSub Subscribe is a paid API for AI agents from 2s.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Subscribe a callback URL to a pub/sub topic so that published messages are POSTed to your endpoint in real time
Price / call$0.005
Success—
StatusUnknown
How this service works
The (most) everything API: 575+ pay-per-call endpoints for AI agents — ground-truth data, a full AI gateway, and agent infrastructure (storage, queues, watchers). USDC via x402, no signup, no API keys, and upto billing: pay actual usage, not the quote.
Output
Returns a subscription record including a confirmation token that the callback URL must echo back to activate the subscription. Once confirmed, any messages published to the topic will be POSTed to the registered callback URL with a signed body.
Example use cases
Example prompt
“Subscribe my webhook at https://myapp.example.com/hooks/events to the topic ID topic_abc123 on 2s — tag it as 'order-updates' so I can track it, and make sure it echoes back the confirmation token to activate.”
Technical details
Endpoint
POSThttps://2s.io/api/pubsub/subscribeWhen to prefer
Use this endpoint when you need to reactively receive messages published to a 2s.io pub/sub topic at a webhook endpoint rather than polling. Ideal for event-driven agent workflows where low-latency delivery to your server matters and you have a publicly reachable HTTP/HTTPS callback URL. Requires a topic created via pubsub.create-topic.
Side effects
- topicId does not exist — 404 or error indicating unknown topic
- callbackUrl is unreachable or does not echo the confirmation token — subscription remains inactive
- callbackUrl exceeds 2048 character limit — validation error
- label exceeds 64 character limit — validation error
- malformed callbackUrl (non-http/https scheme) — validation error
- insufficient USDC balance to cover $0.002 per-call fee — payment failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| label | string | Optional free-text tag. |
| topicId | string | The topicId to subscribe to (from pubsub.create-topic). |
| callbackUrl | string | Where we POST published messages. Any http(s) URL; must echo the confirmation token to activate; body is signed. |
Tags
x402
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