{"id":"11d78962-de3c-46f6-9915-27daae297c6c","shortId":"ZZDHY2","kind":"x402","title":"Semantic diff analysis and breaking change detection for code, paid per call via x402 on Base.","tagline":"Semantic diff analysis and breaking change detection for code, paid per call via x402 on Base.","description":"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.\n\nAll 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`.\n\nThe 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).","tags":[],"capabilities":["semantic-diff","breaking-change-detection","code-analysis","x402-payment","usdc-on-base","developer-security","agent-to-agent"],"categories":["security","dev-tools"],"synonyms":["code diff analysis","breaking change detector","semantic code diff","API diff impact","developer security scan","diff review","code change analysis"],"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"],"endpointUrl":"https://defi-shield-hazel.vercel.app/api/dev/diff-impact","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x0814d35F25F2EF3Dffa4aEF4d137558D5E51Ed7b","amount":"50000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"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 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'/api/analytics':175 '/api/dev/diff-impact':34,96 '/api/health':166 '0.05':101 '404':198 '69':44 'API diff impact' 'a2a':178 'agent':54,104,179 'agent-to-agent' 'ai':53 'analysi':3,19,61 'analyt':173 'api':46 'autonom':52 'avail':142 'base':16,32,94,121 'break':5,21,63,233 'breaking change detector' 'breaking-change-detection' 'call':12,28,103 'card':180 'chang':6,22,64,68,234 'code':9,25,67 'code change analysis' 'code diff analysis' 'code-analysis' 'crawl':193,211 'defi':39,82 'detail':187 'detect':7,23,65,235 'develop':74 'developer security scan' 'developer-security' 'diff':2,18,60,231 'diff review' 'discoveri':140,160 'doc':195 'document':188,208 'endpoint':35,47,57,76,84,97,123,139,165,169,174,205,226 'exact':200 'expect':215 'facilit':115 'field':217 'five':73 'found':191 'free':138 'get':144 'header':113 'health':164 'includ':152,162 'infer':223 'input':216 'intellig':50 'json':129 'list':167 'llm':154 'materi':212 'mechan':161 'metadata':151 'must':221 'offer':77 'one':71 'openapi':184 'output':219 'page':189 'paid':10,26,45 'part':37 'path':148,196 'payment':88,112,119,131 'per':11,27,102 'perform':58 'platform':80,158 'post':107 'price':99,171 'process':124 'prompt':156 'protocol':89 'provid':48,159 'purpos':229 'request':108,126 'request/response':201 'respons':137 'return':128,150,197 'schema':185,202 'secur':49,75 'semant':1,17,59,230 'semantic code diff' 'semantic-diff' 'send':105 'settl':90,132 'shield':40,83 'specif':56 'state':228 'structur':220 'success':136 'suit':42 'usag':155 'usdc':92,118 'usdc-on-base' 'use':85 'verifi':116 'via':13,29,143 'x402':14,30,87,111 'x402-payment'","prices":[{"id":"57f2fe8b-38f9-45dd-acb0-5a385f8146f8","listingId":"11d78962-de3c-46f6-9915-27daae297c6c","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0x0814d35F25F2EF3Dffa4aEF4d137558D5E51Ed7b","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x0814d35F25F2EF3Dffa4aEF4d137558D5E51Ed7b","amount":"50000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:41.054Z"}],"sources":[{"listingId":"11d78962-de3c-46f6-9915-27daae297c6c","source":"x402_bazaar","sourceId":"https://defi-shield-hazel.vercel.app/api/dev/diff-impact","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:41.054Z","lastSeenAt":"2026-04-22T05:32:33.955Z"}],"details":{"listingId":"11d78962-de3c-46f6-9915-27daae297c6c","quickStartSnippet":"# Discover endpoint metadata (free)\ncurl https://defi-shield-hazel.vercel.app/api/dev/diff-impact\n\n# Paid request (requires x402 payment header)\ncurl -X POST https://defi-shield-hazel.vercel.app/api/dev/diff-impact \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"diff\": \"--- a/index.js\\n+++ b/index.js\\n@@ -1 +1 @@\\n-module.exports = foo;\\n+module.exports = bar;\"}'","exampleRequest":null,"exampleResponse":null,"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"DeFi Shield offers 69 paid API endpoints for security intelligence via x402 on Base","source_url":"https://defi-shield-hazel.vercel.app"},{"claim":"/api/dev/diff-impact performs semantic diff and breaking change detection at $0.05 per call","source_url":"https://defi-shield-hazel.vercel.app"},{"claim":"Free endpoint discovery is available via GET on each endpoint path","source_url":"https://defi-shield-hazel.vercel.app"},{"claim":"Payment settles in USDC on Base via x402 protocol","source_url":"https://defi-shield-hazel.vercel.app"}],"useCases":["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"],"bestFor":["AI agents needing automated breaking change detection in code diffs","Autonomous developer tooling pipelines using x402 micropayments","Security-focused code review workflows"],"notFor":["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"],"kindDetails":{},"updatedAt":"2026-04-22T02:55:23.597Z"}}