Idempotency
One stable key.
Canonical JSON sorting makes the same object produce the same namespaced SHA-256 key even when object fields arrive in a different order.
Hosted API · version 1.0.0
Webhook Reliability API
Generate stable idempotency keys, decide whether an HTTP retry is replay-safe, and check incoming JSON against a small explicit contract.
Retry safety
Retry deliberately.
Recognizes common transient HTTP statuses, honors
Retry-After, caps exponential delay, stops at the
attempt limit, and refuses unsafe POST or PATCH replay without an
idempotency key.
Contracts
Fail with evidence.
Checks JSON Pointer paths, required values, JSON types, non-empty fields, and allowed-value lists, then returns a compact machine-readable error list.
Verified boundaries
Small, deterministic, and bounded.
- Seven automated tests pass
- 64 KiB maximum request body
- 5,000 JSON nodes and depth 20
- At most 100 contract rules
- No third-party endpoint calls
- No credentials requested
Marketplace pricing
Test free, scale when useful.
- Basic: 100 requests free
- Pro: $9 monthly for 5,000 requests
- Ultra: $29 monthly for 25,000 requests
- Mega: $79 monthly for 100,000 requests
All four plans are live on RapidAPI. Start on Basic without a monthly charge, then upgrade only when the request allowance is useful.
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