# GET /upgrade/fix: $0.10 per call

Premium "fix this dependency upgrade" report for moving package X from version A to B: breaking changes from every release note, the project's migration guide, changed runtime/peer requirements, vulnerabilities fixed or introduced, problems others hit after upgrading (GitHub issues, Stack Overflow), and a cited step-by-step upgrade plan.

- **Price:** $0.10 in USDC, the same on Base, Solana, Polygon, Arbitrum. Failed calls are never charged.
- **Free trial:** no, paid only (it uses a paid AI model or data source, or costs more than the trial covers). Other ways to pay: x402 or [prepaid credits](/credits).
- **Tier:** deep
- **Answers cached for:** 12 hour(s)
- **Data sources:** GitHub releases / CHANGELOG / migration guides (free); npm and PyPI metadata (free); OSV.dev (free); GitHub issues and Stack Overflow (free); Workers AI (metered)
- **Lane:** AI coding agents ([OpenAPI](/openapi/coding.json))
- **Live health:** [status page](/status)

## Free sample

See an answer for the demo input first, free (no payment, 10 a minute): [https://aayatai.com/sample/upgrade-fix](/sample/upgrade-fix). It is a stored real answer when we have one, otherwise an example marked `"kind": "illustrative"`.

```bash
curl "https://aayatai.com/sample/upgrade-fix"
```

## 1. See the price (free)

Call it without paying: you get `402 Payment Required` and a `PAYMENT-REQUIRED` header with the exact price and where to pay.

```bash
curl -i "https://aayatai.com/upgrade/fix?ecosystem=npm&name=hono&from=4.12.0&to=4.13.9"
```

## 2. Pay and call (TypeScript)

```bash
npm install @x402/fetch @x402/evm viem
```

```ts
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

// A wallet used only by your agent, holding a little USDC on Base.
const account = privateKeyToAccount(process.env.WALLET_PRIVATE_KEY as `0x${string}`);
const pay = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});

const res = await pay("https://aayatai.com/upgrade/fix?ecosystem=npm&name=hono&from=4.12.0&to=4.13.9");
console.log(await res.json());
```

## 3. Or as an MCP tool

```ts
// MCP server: https://aayatai.com/mcp (Streamable HTTP). With the x402 MCP client (see /start):
const result = await client.callTool("upgrade-fix", {"ecosystem":"npm","name":"hono","from":"4.12.0","to":"4.13.9"});
```

## Inputs

- `ecosystem` (string; one of `npm`, `pypi`, `crates`, `go`; default `npm`): Package ecosystem: npm, pypi, crates (Rust) or go (Go modules).
- `name` **(required)** (string): Package name, e.g. express, requests, serde or github.com/gin-gonic/gin.
- `from` **(required)** (string): Version you use now, e.g. 6.22.0.
- `to` (string): Target version (default: latest).

Bad inputs are rejected with HTTP 400 before any payment is asked for.

## Example answer

```json
{
  "ecosystem": "npm",
  "name": "hono",
  "from": "4.12.0",
  "to": "4.13.9",
  "majorVersionChange": false,
  "plan": "## Summary\nA minor upgrade with no breaking changes [1]...\n\n## Steps\n1. ...",
  "sources": [
    {
      "n": 1,
      "kind": "release-notes",
      "url": "https://github.com/honojs/hono/releases/tag/v4.13.9"
    }
  ],
  "breakingHints": [],
  "requirementChanges": [
    {
      "what": "runtime",
      "from": ">=16.9.0",
      "to": ">=18.14.1"
    }
  ],
  "security": {
    "fixed": [],
    "remaining": [],
    "introduced": []
  },
  "migrationGuide": null,
  "knownIssues": [],
  "releases": 2,
  "checkedAt": "2026-09-28T12:00:00.000Z"
}
```

## Related

- [GET /docs/find](/services/docs-find) ($0.003): Find the AI-ready docs for any library or API: checks the project's docs site (from its npm, PyPI, crates or Go metadata) or any company domain (docs., develope
- [GET /docs/lib](/services/docs-lib) ($0.005): Up-to-date docs for any npm, PyPI, crates or Go library, trimmed for a coding agent's context: finds the project's own llms.txt and docs pages (or the latest re
- [POST /docs/answer](/services/docs-answer) ($0.02): Ask a coding question about any npm, PyPI, crates or Go library and get an answer written only from its current docs (project llms.txt, docs pages or latest REA
- [GET /openapi](/services/openapi) ($0.005): Understand any public API fast: give its OpenAPI/Swagger spec URL, its docs or base URL, or a name from the APIs.guru directory (?api=stripe.com); we find the s
- [GET /library/research](/services/library-research) ($0.10): Premium research report on a library or API for coding agents: reads its current docs for your goal, checks version, safety and repository health, gathers what 
- [GET /package/check](/services/package-check) ($0.005): Should a coding agent install this package?
- [GET /dependency/verdict](/services/dependency-verdict) ($0.03): "Should I use this dependency?" in one call for npm, PyPI, crates or Go: full package safety check (vulnerabilities, malware, typosquats, deprecation, licence, 
- [GET /dependency/report](/services/dependency-report) ($0.08): Premium "should I use this dependency?" report: package safety (vulnerabilities, malware, typosquats, deprecation), GitHub repository health, licence compatibil

New here? [Getting started in 60 seconds](/start). All services: [Aayat AI](/).