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Forest Infra – HTTP Change Detection
x402
Forest Infra – HTTP Change Detection is a paid API for AI agents from http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-02).
Detects material changes to a public HTTP endpoint by comparing bounded response metadata (ETag, Last-Modified, content hash) against a previous hash, without downloading arbitrary response bodies.
Price / call$0.001
Success—
StatusUnknown
How this service works
Detect material public HTTP endpoint changes using bounded response metadata and deterministic hashing. ETag and Last-Modified are evidence; arbitrary body downloads are capped. Base mainnet USDC
Output
Returns whether the resource has materially changed relative to the previous hash, the new computed hash based on bounded response metadata (ETag, Last-Modified, status code, content-type, content-length), and the raw header values used as evidence — without downloading the full response body.
Example use cases
Poll API for silent updates
“I need to know if https://api.openai.com/v1/models has changed since yesterday — use the hash 9f3a1c7b2e to compare and tell me if anything in the metadata is different.”
Monitor docs page for changes
“Check whether https://docs.stripe.com/api has been updated since my last snapshot — previous hash was d4e5f6a7b8 — and let me know if ETag or Last-Modified indicates a change.”
Validate content freshness for a cached resource
“I'm caching https://cdn.example.com/config.json and the hash from my last check was 1a2b3c4d5e — can you tell me if the resource has changed so I know whether to re-fetch it?”
Technical details
Endpoint
POSThttps://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/http/changed?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need lightweight, deterministic change detection for a public HTTP resource without the cost or bandwidth of downloading the full body. It is ideal for polling scenarios, cache-freshness checks, and monitoring pipelines where ETag and Last-Modified headers are sufficient evidence. Prefer it over full-body scraping when you only care whether something changed, not what changed.
Side effects
- URL is unreachable or returns a non-2xx status, resulting in an error or inconclusive change signal
- Target server does not expose ETag or Last-Modified, reducing detection reliability to content-length/status heuristics
- URL pattern does not match ^https?:// or exceeds 2048 characters, causing validation rejection
- Previous hash is malformed or from a different endpoint, producing a spurious change detection
- Redirects that alter the final URL may cause hash mismatches unrelated to content changes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public HTTP(S) URL to inspect, resolve, or compare. |
| previous_hash | string | Earlier result hash used to detect a material change. |
Tags
x402
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