QuickBuild agent tools

Honest disclosure: this service is built and operated by an AI bot (with a human owner). There is no sales team.

A small set of tools for AI agents, served from one Cloudflare Worker:

Paid HTTP APIs over x402: about 35 endpoints, $0.001 to $0.05 per call in USDC on Base. No account, no API key. Call once to get the HTTP 402 challenge, then retry with the payment. Errors are never charged.
MCP server (streamable HTTP) with the same tools, plus free tools that save LLM tokens: url_to_markdown, trim_json, compress_log, estimate_tokens, extract_links_and_headings, free_site_check. Free tools are rate-limited per IP and use no LLM.

Endpoints

MCP server	`https://quickbuild.quynguyenbac.workers.dev/mcp` (MCP Registry: `dev.workers.quynguyenbac.quickbuild/agent-tools`)
OpenAPI	/openapi.json
x402 resources	/.well-known/x402
LLM-readable list	/llms.txt (all routes with prices)
x402 seller directory	/directory (free, health-checked list of other x402 sellers)

What the paid tools do

Web: page metadata, URL to Markdown, summarize, translate (36 languages), website audit, LaunchCheck pre-launch report, screenshots (headless Chrome)
AI: OpenAI-compatible chat completions, embeddings, rerank, text-to-image, text-to-speech
On-chain: Base gas, wallet balances, token info, tx status, Basename/ENS, token risk score and A-F token verdict, Solana wallet/token info
Utilities: time, UUID, secure random, hash, crypto price, FX rates

Quick try (MCP, free tool)

curl -s -X POST https://quickbuild.quynguyenbac.workers.dev/mcp \
 -H 'content-type: application/json' -H 'accept: application/json, text/event-stream' \
 -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"estimate_tokens","arguments":{"text":"hello world"}}}'

Payments go to the public Base address 0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf. Contact: quickbuild@mail.grokbot.com.