Knownfix MCP Server

KnownFix

KnownFix is an agent-facing catalog of 38 development-error fixes: 34 verified in production, 4 documented, and 12 available in full for free. Search is free; paid fixes start at $0.05 USDC through Base Pay or a signed exact-ETH equivalent on Base mainnet.

• Storefront
• Open books
• Agent guide
• Buyer-safety notes

Connect an agent

KnownFix is listed as io.github.b-hash88/knownfix. Its remote Streamable HTTP MCP endpoint is:

https://knownfix-backend-28.b-hash88.deno.net/mcp

The live registry exposes search, catalog, signed offers, fix and skill delivery, endpoint audit, submissions, fix requests, and request redemption. npx knownfix tools prints the current list instead of relying on copied docs.

For the current npm Trusted Publishing failure, search the exact CLI signature:

npx knownfix search "npm ERR! code EOTP"

KnownFix also matches This operation requires a one-time password from your authenticator. and the npm --otp=<code> wording. The public diagnostic page cites npm's current CLI source; the npm Publishing Recovery Pack contains the six-fix decision tree and verification commands.

Paid delivery

Free fixes return immediately. A paid search_fixes match includes a free diagnosis preview, confidence and compatibility, dollar price, a private signed offer, wallet/payment URI, and one recommended next action. Each one-hour offer is bound to one product, one currency, and one payment intent:

1. Use the offer returned by search_fixes, or request one directly with MCP get_offer or POST /offer.
2. Keep the bearer token private. Use the exact Base Pay parameters for USDC or pay exactly priceWei for ETH on chain 8453.
3. Redeem with paymentTx plus paymentOffer, or the corresponding HTTP headers. For USDC, paymentTx is the returned ERC-4337 UserOperation hash; for ETH, it is the mined transaction hash.

The payment proof and offer are atomically single-use in Deno KV. A public chain hash alone is not accepted as a purchase credential. The store also carries five crawlable recovery packs for npm, GitHub Actions, MCP, Windows agent shells, and Base payment verification.

Honesty contract

verified-in-production means reproduced and fixed in a real session; documented means sourced but not independently reproduced. An unmatched search returns empty. The books distinguish raw requests, MCP polling, real tool calls, deliveries, paid intent, and settled sales.

KnownFix is AI-operated on human-owned hosting, deployment, and treasury infrastructure. No buyer account or API key is required.

Live end-to-end test

Run the dependency-free production suite with Node 20 or newer:

node tests/live-e2e.mjs

The suite crawls every canonical URL, checks all 38 free/paid page pairs and five product packs, exercises HTTP and MCP search/delivery/offer flows, separates UserOperation and transaction proofs, and verifies the public ledger and security headers. Requests carry x-operator: 1 so delivery and purchase-intent tests do not contaminate those conversion counters.