SpecLock - AI Constraint Engine alternatives
12 MCP servers, A2A agents and x402 APIs that also do coding & dev tools, ai models & inference, ranked by how much they overlap with SpecLock - AI Constraint Engine (MCP server), live ones first.
Compared
| Name | Type | Live | Tools / skills | Check |
|---|---|---|---|---|
| SpecLock - AI Constraint Engine (this one) | MCP server | Yes | – | – |
| DevMatch (zachary-royals) | MCP server | Yes | – | – |
| gitBeacon API | x402 paid API | Yes | 1 | 90/100 |
| Code Reviewer | A2A agent | Yes | 3 | – |
| Atlas Web Compiler & Scraper | MCP server | Yes | – | 55/100 |
| NPM Sentinel MCP | MCP server | Yes | – | 55/100 |
| MaShop MCP | MCP server | Yes | – | – |
| scan.openverbs.com | x402 paid API | Yes | 4 | – |
| b612 | A2A agent | Yes | 6 | – |
| datastand.dev | x402 paid API | Yes | 10 | – |
| Encrypted OAuth LLM Agent | A2A agent | Yes | 7 | – |
| Structured Output MCP Agent (Cryptography) | A2A agent | Yes | 8 | – |
| webbersites.com | x402 paid API | Yes | 12 | – |
Live = answered our latest free daily check. Check = our automated scored check (card, handshake, endpoint, domain), not a guarantee.
The alternatives
- DevMatch (zachary-royals) Live MCP
DevMatch is an MCP server for hiring engineers based on what they've actually built. Connect from Cursor, Claude Desktop, or any MCP-compatible AI assistant and search 35M+ developers ranked by verified open-source cont…
MCP server · zachary-royals · also does coding & dev tools, ai models & inference
- gitBeacon API Live x402
gitBeacon — GitHub trend intelligence for AI agents. A daily scan of trending new GitHub repos, LLM-analyzed into a structured digest (title, summary, top categories, language trends, emerging tools, notable projects, a…
x402 paid API · 1 endpoint · check 90/100 · also does coding & dev tools, ai models & inference
- Code Reviewer Live A2A
Paste up to 8000 characters of code (any common language) with what you want: a review (bugs, security issues, edge cases, readability, with severity and a suggested fix for each), an explanation of what it does, or a f…
A2A agent · Rooms by Aurmada · 3 skills · also does coding & dev tools, ai models & inference
- Atlas Web Compiler & Scraper Live MCP
Deterministic Zero-LLM Web Compiler, Scraper, Crawler, and Site Mapper for AI Agents.
MCP server · com.atlas-compiler · check 55/100 · also does coding & dev tools, ai models & inference
- NPM Sentinel MCP Live MCP
Provide AI-powered real-time analysis and intelligence on NPM packages, including security, dependencies, performance, and quality metrics. Enable faster and safer package management decisions by integrating with Claude…
MCP server · Nekzus · check 55/100 · also does coding & dev tools, ai models & inference
- MaShop MCP Live MCP
Build, deploy and manage MaShop e-commerce projects from Claude, Cursor or any MCP client.
MCP server · app.mashop · also does coding & dev tools, ai models & inference
- scan.openverbs.com Live x402
Scan source code or configuration text for hardcoded secrets: AWS access keys, GitHub/Slack/Google tokens, Stripe and OpenAI keys, PEM private-key blocks, JWTs and high-entropy secret assignments. Placeholder values are…
x402 paid API · 4 endpoints · also does coding & dev tools, ai models & inference
- b612 Live A2A
Japanese-market code review agent. Returns review checklists, industry requirement presets with mandatory Japanese legal checks, field-tested failure patterns from real client projects, and scans code you send to report…
A2A agent · HaneruTo · 6 skills · also does coding & dev tools, ai models & inference
- datastand.dev Live x402
Cost-optimised endpoint selection: name a capability (web search, token safety, enrichment) and get the x402 endpoints that provide it ranked cheapest-first in USDC per call, with adoption stats. Refreshed daily from th…
x402 paid API · 10 endpoints · also does coding & dev tools, ai models & inference
- Encrypted OAuth LLM Agent Live A2A
Encrypted OAuth LLM Agent: composes cryptography + google-auth-oauthlib + langchain + mcp + openai + opentelemetry-exporter-otlp + opentelemetry-sdk — crypto, oauth-oidc, orchestration, agent-protocol, llm-client, obser…
A2A agent · VDA / GOSCE · 7 skills · also does coding & dev tools, ai models & inference
- Structured Output MCP Agent (Cryptography) Live A2A
Structured Output MCP Agent (Cryptography): composes authlib + cryptography + instructor + langchain-core + mcp + openai + opentelemetry-sdk — oauth-oidc, crypto, structured-output, orchestration, agent-protocol, llm-cl…
A2A agent · VDA / GOSCE · 8 skills · also does coding & dev tools, ai models & inference
- webbersites.com Live x402
ANTHROPIC-COMPATIBLE /v1/messages — Claude Haiku 4.5 through the exact Anthropic API dialect: same request/response shape, no Anthropic account, the x402 payment IS the auth. Point an Anthropic SDK's base_url at https:/…
x402 paid API · 12 endpoints · also does coding & dev tools, ai models & inference