@ambolt/mcp

Ambolt MCP server

Pay-per-call data and lookup tools for AI agents and developers, as an MCP server. Every result names its source and the time it was fetched.

• MCP endpoint (streamable HTTP, JSON-RPC): https://api.ambolt.dev/mcp
• Website and docs: https://ambolt.dev
• Registry name: dev.ambolt/ambolt

What is in this repository

• bin/ambolt-local.mjs: a complete MCP server (stdio) whose five tools run in this repository's code, with no Ambolt account or hosted service: iban_validate (offline), disposable_email_check, dns_lookup, fx_rate_ecb and package_vulnerabilities. Source in functions/ and src/; run it with npx -y -p @ambolt/mcp ambolt-local or node bin/ambolt-local.mjs.
• bin/ambolt-mcp.mjs: the bridge to the hosted server with all 37 tools (see the table below). The hosted server's other tools (company registers, tenders, on-chain facts, Solana swap and so on) run on Ambolt's infrastructure and are not part of this repository.

Connect

{ "mcpServers": { "ambolt": { "url": "https://api.ambolt.dev/mcp" } } }

For clients that only speak stdio (Claude Desktop, many IDE agents), use the bridge package; it forwards to the same hosted server and needs no API key:

{ "mcpServers": { "ambolt": { "command": "npx", "args": ["-y", "@ambolt/mcp"] } } }

Rate limit: 30 requests per minute per IP on the MCP route. For higher volume and a payment-secured API, use the HTTP endpoints with the x402 protocol (USDC on Base): see https://ambolt.dev.

Tools (37)

Tool	What it returns	Price per call over HTTP (x402)
base_erc20_balance	ERC-20 token balance of a wallet address on Base mainnet (USDC, WETH, any token): raw units, decimals, symbol and formatted amount, read live via eth_call.	$0.003
base_token_facts	Verifiable on-chain facts about an ERC-20 token on Base: name, symbol, supply, whether the contract has an owner (and whether it was renounced), whether it is an upgradeable proxy and who administers it, whether it is paused, and which privileged functions (mint, burn, pause, blacklist, fee setting, upgrade) appear in its bytecode.	$0.01
base_token_info	Basic facts about an ERC-20 token contract on Base mainnet: name, symbol, decimals and total supply (raw and formatted), read live via eth_call.	$0.003
base_transaction	Look up a transaction on Base by hash: success or revert, block and time, sender, recipient, ETH value, gas and fee, the called method selector, and decoded ERC-20 transfers with token symbols.	$0.005
base_wallet_balances	ETH balance and balances of major tokens (USDC, WETH, cbBTC, DAI, USDbC, cbETH, AERO) for any address on Base, plus any extra token contracts you list.	$0.005
disposable_email_check	Fast email address check without sending anything: syntax, domain MX records, disposable/temporary-mail domain (9,000+ listed), role address (info@, admin@) and likely typo of a popular provider.	$0.003
dk_co2_intensity	CO2 emissions per kWh of electricity consumed in Denmark (DK1 West, DK2 East), latest 5-minute value plus 24-hour average, cleanest and dirtiest times.	$0.005
dk_electricity_prices	Day-ahead electricity spot prices for one day and bidding area, in EUR and DKK per MWh, quarter-hourly or hourly, with min/max/average and the cheapest hours.	$0.01
dns_lookup	Resolve public DNS records for a domain (A, AAAA, MX, TXT, NS, CNAME) and report whether SPF and DMARC records are present, with their policies.	$0.003
doi_lookup	Scholarly metadata by DOI, or a best-match search by citation text: title, authors, journal, year, publisher, citation count, licence links and URL. Bibliographic facts only.	$0.003
domain_rdap	Look up a domain in the public RDAP registry: registration, last-changed and expiry dates, status codes, nameservers, DNSSEC flag and registrar name.	$0.003
domain_ssl_sweep	Check SSL certificate and domain registration expiry for one domain or a whole list: certificate issuer, valid from and to, days left, trusted or not, domain registration and expiry dates, registrar and nameservers.	$0.005
ecb_key_rates	The three ECB key interest rates with their latest change dates and recent history.	$0.003
ens_resolve	Resolve an ENS name (e.g.	$0.003
entity_resolve	Resolve a company name, website domain, registry number, LEI or VAT number to its official legal entity: registry, registry number, legal form, status, address, industry codes, size where published and LEI. Searches national registers (Norway, Finland, Czechia, Slovakia, France, UK; Poland by KRS number) and GLEIF, scores the match and links every record to its source.	$0.01
eu_vat_validate	Check whether an EU VAT number is valid and active.	$0.003
fx_rate_ecb	European Central Bank euro foreign-exchange reference rates for any date since 1999, converted to any base currency.	$0.003
iban_validate	Validate an IBAN offline: ISO 13616 checksum (mod 97), registered length for the country, and a normalised and grouped format.	$0.003
lei_lookup	Look up a Legal Entity Identifier (LEI) record by 20-character LEI, or search legal entities by name and country.	$0.005
nordic_company_lookup	Look up companies in the Norwegian and Finnish company registers by registration number or name: name, legal form, industry, address, registration date and status.	$0.005
package_vulnerabilities	Check an npm or PyPI package version against a public vulnerability database: advisory ids, aliases (CVE, GHSA), summary, severity label and first fixed version, plus the latest published version.	$0.003
rss_feed_normaliser	Turn any RSS 2.0, RSS 1.0, Atom or JSON Feed into one clean JSON schema: feed title, link and language, then items with id, title, URL, ISO published/updated dates, summary, categories and enclosure.	$0.003
sitemap_robots_doctor	Audit a website's robots.txt and XML sitemaps in one call: user-agent groups and blocked paths, sitemap declarations, whether each sitemap loads, URL counts (indexes followed to 10 files), lastmod coverage and age, duplicates, off-host and non-HTTPS URLs, size-limit breaches, and a sample of listed URLs checked for status.	$0.005
solana_swap_quote	Get a swap quote on Solana through a DEX aggregator: expected output, minimum output after slippage, price impact, route venues and all fees in basis points.	free
solana_swap_transaction	Build an unsigned Solana swap transaction through a DEX aggregator for a wallet you control.	free
solana_token_facts	Verifiable on-chain facts about a Solana token mint: whether the mint and freeze authorities are still set, total supply, decimals, token program, and how much of the supply the largest token accounts hold, plus public market metrics from a token index.	$0.01
solana_token_price	Current USD price, 24-hour change, liquidity and decimals for up to 50 Solana token mints in one call, from an aggregated market feed.	$0.003
solana_token_search	Find Solana tokens by symbol, name or mint address: mint, decimals, verification flag, organic score, liquidity, market cap and holder count.	$0.003
solana_transaction	Look up a confirmed Solana transaction by signature: success or error, time, fee, signers, programs used, and the resulting SOL and token balance changes per account.	$0.005
solana_wallet_balances	SOL balance and token holdings of any Solana address, with symbols, USD prices and values, largest first.	$0.01
tech_stack_lookup	Detect the technologies a public website uses: CMS or site builder, JavaScript framework, CDN and hosting, web server, analytics and tag managers, advertising pixels, support widgets, payments, consent tools.	$0.005
ted_notices_search	Find recent EU public procurement notices by buyer country, CPV code, keyword and notice type.	$0.01
tender_feed	Search public tenders across TED (EU), Find a Tender (UK) and SAM.gov (US) in one normalised schema: title, buyer organisation, country, CPV codes, deadline, estimated value, procurement method and source link.	$0.02
url_metadata	Link-preview data for one or many public URLs: title, description, canonical URL, Open Graph and Twitter card fields, favicon, language, hreflang alternates, feed links and JSON-LD types.	$0.003
url_to_markdown	Fetch a public web page and return its main text as Markdown with title, headings, lists, tables and absolute links.	$0.003
us_treasury_rates	Monthly average interest rates on US Treasury marketable securities (bills, notes, bonds, TIPS, FRNs) Latest months first.	$0.003
wikipedia_summary	Lead-section summary of a Wikipedia article by title and language: plain-text extract, short description, canonical URL and last-edit time.	$0.003

Informational only, not financial, legal or tax advice. Crypto tools are read-only or produce unsigned transactions; no keys or funds are ever held. Terms: https://ambolt.dev/terms. Privacy: https://ambolt.dev/privacy.

License

The code and documentation in this repository are MIT licensed. The hosted service is operated by Ambolt.