Semantic diff analysis and breaking change detection for code, paid per call via x402 on Base.
What it does
The `/api/dev/diff-impact` endpoint is part of DeFi Shield, a suite of 69 paid API endpoints providing security intelligence to autonomous AI agents. This specific endpoint performs semantic diff analysis and breaking change detection on code changes. It is one of five Developer Security endpoints offered by the platform.
All DeFi Shield endpoints use the x402 payment protocol, settling in USDC on Base. The `/api/dev/diff-impact` endpoint is priced at $0.05 per call. Agents send a POST request with an x402 payment header; the facilitator verifies the USDC payment on Base, the endpoint processes the request and returns JSON, and payment settles only on a successful response. Free endpoint discovery is available via GET on the same path, which returns metadata including an `llm_usage_prompt`.
The platform provides discovery mechanisms including a health endpoint (`/api/health`) listing all endpoints and pricing, an analytics endpoint (`/api/analytics`), and an A2A agent card at `/.well-known/agent-card.json`. No OpenAPI schema or detailed documentation page was found during crawling — the docs path returns 404. The exact request/response schema for this endpoint is not documented in the crawled material, so the expected input fields and output structure must be inferred from the endpoint's stated purpose (semantic diff and breaking change detection).
Capabilities
Use cases
- —Detecting breaking changes in pull requests or code updates before deployment
- —Automated code review pipelines where agents assess diff impact
- —CI/CD integration to flag risky code changes with per-call payment
- —Agent-driven dependency update analysis to catch semantic regressions
Fit
Best for
- —AI agents needing automated breaking change detection in code diffs
- —Autonomous developer tooling pipelines using x402 micropayments
- —Security-focused code review workflows
Not for
- —Large-scale batch diff processing where per-call pricing becomes expensive
- —Use cases requiring detailed line-by-line code review with human-readable annotations
- —Projects that need free or open-source diff tooling
Quick start
# Discover endpoint metadata (free)
curl https://defi-shield-hazel.vercel.app/api/dev/diff-impact
# Paid request (requires x402 payment header)
curl -X POST https://defi-shield-hazel.vercel.app/api/dev/diff-impact \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402-payment-token>" \
-d '{"diff": "--- a/index.js\n+++ b/index.js\n@@ -1 +1 @@\n-module.exports = foo;\n+module.exports = bar;"}'Endpoint
Quality
The endpoint is live (402 challenge captured) and pricing is documented on the landing page, but no OpenAPI schema, detailed docs, or request/response examples are available. The x402 challenge object was empty, providing no additional payment metadata. Input/output schemas are entirely inferred.
Warnings
- —No OpenAPI or JSON schema available for request/response format
- —Docs page returns 404 — no detailed endpoint documentation found
- —x402 challenge body was empty — no payment parameters (amount, token, network) captured in probe
- —Request and response examples are not available and cannot be reliably inferred
Citations
- —DeFi Shield offers 69 paid API endpoints for security intelligence via x402 on Basehttps://defi-shield-hazel.vercel.app
- —/api/dev/diff-impact performs semantic diff and breaking change detection at $0.05 per callhttps://defi-shield-hazel.vercel.app
- —Free endpoint discovery is available via GET on each endpoint pathhttps://defi-shield-hazel.vercel.app
- —Payment settles in USDC on Base via x402 protocolhttps://defi-shield-hazel.vercel.app