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Breakra OpenAPI Breaking-Change Analyzer
x402
Breakra OpenAPI Breaking-Change Analyzer is a paid API for AI agents from breakra.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-10).
Compares two OpenAPI 3.0 JSON contracts and returns every breaking change, its evidence, and a recommended fix
Price / call$0.02
Success—
StatusUnknown
How this service works
Compare two OpenAPI 3.0 contracts and get every breaking change, the evidence and a recommended fix. One HTTP call, $0.02 USDC on Base via x402. Errors are free.
Output
Returns a structured JSON object containing a list of changes, each with a stable rule ID (e.g. 'request.required_parameter_added'), a compatibility classification (breaking, potentially_breaking, compatible, unknown, or non_contract), the affected operation (HTTP method + path), the location within the schema, the reason for the classification, evidence showing the before/after values at the relevant path, and a recommended action. Also includes summary statistics, spec versions, engine/rule-set versions, and an analysis ID.
Example use cases
Pre-deploy API safety check
“Before I deploy this new version of my payments API, compare the old OpenAPI spec and the new one and tell me if anything will break existing callers — list every breaking or potentially breaking change and what I should do about it.”
Code review gate for API PRs
“I'm reviewing a pull request that changes our OpenAPI contract. Can you run a breaking-change check between the base branch spec and the PR spec and give me a summary of what changed, what's breaking, and what's safe?”
Library upgrade compatibility audit
“We upgraded a third-party API and got a new OpenAPI spec from the vendor. Compare it against the version we're currently integrated with and flag anything that could break our client — especially removed operations or new required fields.”
Technical details
Endpoint
POSThttps://breakra.dev/api/analyze?utm_source=zero.xyzWhen to prefer
Choose Breakra when you need a single-call, structured, machine-readable breakdown of OpenAPI 3.0 contract differences with per-change rule IDs, compatibility classifications, evidence, and fix recommendations — especially in CI/CD pipelines or coding-agent workflows where you need deterministic output rather than a prose diff. Prefer this over generic diff tools when you need semantic API-contract reasoning, not just textual line diffs.
Side effects
- Input specs are not valid OpenAPI 3.0.0–3.0.4 JSON (YAML, Swagger 2.0, OpenAPI 3.1, or URLs are rejected)
- Missing required 'before' or 'after' fields returns an error (free of charge)
- Malformed JSON in either contract causes a parse error
- Very large specs may result in truncated evidence fields (over 1,000 characters truncated)
- Payment failure or insufficient USDC balance blocks the request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| afterrequired | object | New contract: an inline OpenAPI 3.0.0–3.0.4 JSON document. |
| beforerequired | object | Previous contract: an inline OpenAPI 3.0.0–3.0.4 JSON document. URLs, YAML, OpenAPI 3.1 and Swagger 2.0 are not accepted. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| statusrequired | string | |
| changesrequired | array | Most severe first. At most 500 are listed; see metadata.changes_omitted. |
| summaryrequired | object | Counts over all changes, including any not listed. |
| metadatarequired | object | |
| analysis_idrequired | string | sha256 of engine version, rule-set version and both canonical input hashes. The same inputs always give the same id and the same result. |
| limitationsrequired | array | What was not analysed, such as external $refs (never fetched) or omitted changes. |
| compatibilityrequired | string | breaking: existing callers will fail (rule set 0.1.0: a removed operation). potentially_breaking: some callers may fail (e.g. a new required input, a removed or newly optional response field, a new response enum value). unknown: not classified; review by hand. compatible: additive and safe. non_contract: docs or metadata only. |
| spec_versionsrequired | object | |
| engine_versionrequired | string | |
| rule_set_versionrequired | string |
Tags
x402
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