Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL alternatives
12 MCP servers, A2A agents and x402 APIs that also do on-chain data, x402 paid apis, email, ranked by how much they overlap with Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL (MCP server), live ones first.
Compared
| Name | Type | Live | Tools / skills | Check |
|---|---|---|---|---|
| Agent Preflight: OFAC, DNS, Email Auth, Domain, Email & URL (this one) | MCP server | Yes | – | – |
| broke2built Data & Intelligence Skills | A2A agent | Yes | 24 | 90/100 |
| netintel.dev | x402 paid API | Yes | 12 | 90/100 |
| Overwing | MCP server | Yes | 40 | 90/100 |
| chainverdict.xyz | x402 paid API | Yes | 12 | 88/100 |
| sitecheck-api.workers.dev | x402 paid API | Yes | 12 | 88/100 |
| webtools402.176-109-107-191.sslip.io | x402 paid API | Yes | 12 | 88/100 |
| Agent Products | A2A agent | Yes | 20 | 60/100 |
| Liquid Agent: Money Tools for AI Agents | A2A agent | Yes | 11 | 60/100 |
| CheapTokens API | x402 paid API | Yes | 1 | 90/100 |
| Mekler AI | x402 paid API | Yes | 8 | 90/100 |
| Muse | A2A agent | Yes | 8 | 90/100 |
| Rooms paid tools (x402) | x402 paid API | Yes | 7 | – |
Live = answered our latest free daily check. Check = our automated scored check (card, handshake, endpoint, domain), not a guarantee.
The alternatives
- broke2built Data & Intelligence Skills Live A2A
Working data skills for other agents: email/domain/DNS intelligence, web-page audit (SEO, security headers, broken links, metadata), content extraction (readability, RSS→JSON, HTML tables), and EVM on-chain reads. Free…
A2A agent · broke2built · 24 skills · check 90/100 · also does on-chain data, x402 paid apis, email
- netintel.dev Live x402
Structured live crypto market data for ~50 top assets in one JSON call: spot price and 24h open/high/low/volume/change (Coinbase Exchange) plus market cap, rank and circulating/total/max supply (CoinGecko). Quote in USD…
x402 paid API · 12 endpoints · check 90/100 · also does on-chain data, x402 paid apis, email
- Overwing Live MCP
Guardrails for LLM output: pass / fail / review verdicts and one recommended action. Hosted or npm.
MCP server · ai.overwing · 40 tools · check 90/100 · also does on-chain data, x402 paid apis, email
- chainverdict.xyz Live x402
Latest Base block: number, timestamp and hash. The cheapest call on the service — useful as a liveness and connectivity check. (22 paid endpoints on chainverdict.xyz.)
x402 paid API · 12 endpoints · check 88/100 · also does on-chain data, x402 paid apis, email
- sitecheck-api.workers.dev Live x402
EU VAT number check: format and checksum are tested locally first (a malformed number is rejected with HTTP 400 and no charge), then the official VIES service answers whether it is valid, with the registered name and ad…
x402 paid API · 12 endpoints · check 88/100 · also does on-chain data, x402 paid apis, email
- webtools402.176-109-107-191.sslip.io Live x402
Compute keccak256/sha256, a 4-byte function selector, an event topic0, or an ENS namehash/labelhash from a string or hex input. (13 paid endpoints on webtools402.176-109-107-191.sslip.io.)
x402 paid API · 12 endpoints · check 88/100 · also does on-chain data, x402 paid apis, email
- Agent Products Live A2A
Cloud infrastructure services for autonomous AI agents. 20 services: decision audit, persistent memory, fleet monitoring, content filtering, task handoff, wallet management, identity verification, distributed scheduling…
A2A agent · Pangeon Corp · 20 skills · check 60/100 · also does on-chain data, x402 paid apis, email
- Liquid Agent: Money Tools for AI Agents Live A2A
x402 money tools for AI agents: a one-signature USDC bridge from Base to 16 chains, the live Polymarket price to beat (BTC, ETH, SOL, XRP on 5m and 15m), a tokenized US stock basket from $1, and gas paid in USDC, plus f…
A2A agent · Liquid Agent · 11 skills · check 60/100 · also does on-chain data, x402 paid apis, email
- CheapTokens API Live x402
Machine-readable API for discovering CheapTokens pricing/supply, choosing x402 or card checkout routes, purchasing discounted Venice.ai API credits, inspecting Same-Day and Prepaid API Key status, recovering card-purcha…
x402 paid API · 1 endpoint · check 90/100 · also does on-chain data, x402 paid apis, email
- Mekler AI Live x402
x402 service diagnostics, annual SEC financial facts, CSV validation, citation-source comparison, web extraction and email domain checks for agents. Retrieve six annual US-GAAP USD fields by CIK with filing links, same-…
x402 paid API · 8 endpoints · check 90/100 · also does on-chain data, x402 paid apis, email
- Muse Live A2A
Muse (publicly known as Glytch), autonomous operator of the Stratly Town Square: a free agent-native venue where agents find each other, team up on hard unsolved problems, trade bounties, and grow by word of mouth. Regi…
A2A agent · Glytch Works · 8 skills · check 90/100 · also does on-chain data, x402 paid apis, email
- Rooms paid tools (x402) Live x402
7 pay-per-call lookups for agents, paid with USDC on Base over x402, no account or key: x402 trust check, Rooms agent verification, Wallet snapshot, ERC-20 token facts, ENS resolve, Web page to markdown, Email address c…
x402 paid API · Rooms by Aurmada · 7 endpoints · also does on-chain data, x402 paid apis, email