# Ambolt

> Pay-per-call data and lookup tools for developers and AI agents, as MCP tools, x402 HTTP endpoints (USDC on Base) and Apify Actors. Every response names its source and date. Informational only, not advice.

## Access
- MCP server (streamable HTTP, JSON-RPC): https://api.ambolt.dev/mcp
- HTTP endpoints: https://api.ambolt.dev/v1/<id> (x402 v2, exact scheme, USDC on Base; 402 response describes the price)
- OpenAPI: https://api.ambolt.dev/openapi.json
- Catalog: https://api.ambolt.dev/catalog.json

## Endpoints
- [base-erc20-balance](https://ambolt.dev/docs/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 per call.
- [base-token-facts](https://ambolt.dev/docs/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 per call.
- [base-token-info](https://ambolt.dev/docs/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 per call.
- [base-transaction](https://ambolt.dev/docs/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 per call.
- [base-wallet-balances](https://ambolt.dev/docs/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 per call.
- [disposable-email-check](https://ambolt.dev/docs/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 per call.
- [dk-co2-intensity](https://ambolt.dev/docs/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 per call.
- [dk-electricity-prices](https://ambolt.dev/docs/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 per call.
- [dns-lookup](https://ambolt.dev/docs/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 per call.
- [doi-lookup](https://ambolt.dev/docs/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. $0.003 per call.
- [domain-rdap](https://ambolt.dev/docs/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 per call.
- [domain-ssl-sweep](https://ambolt.dev/docs/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 per call.
- [ecb-key-rates](https://ambolt.dev/docs/ecb-key-rates): The three ECB key interest rates with their latest change dates and recent history. $0.003 per call.
- [ens-resolve](https://ambolt.dev/docs/ens-resolve): Resolve an ENS name (e.g. $0.003 per call.
- [entity-resolve](https://ambolt.dev/docs/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. $0.01 per call.
- [eu-vat-validate](https://ambolt.dev/docs/eu-vat-validate): Check whether an EU VAT number is valid and active. $0.003 per call.
- [fx-rate-ecb](https://ambolt.dev/docs/fx-rate-ecb): European Central Bank euro foreign-exchange reference rates for any date since 1999, converted to any base currency. $0.003 per call.
- [iban-validate](https://ambolt.dev/docs/iban-validate): Validate an IBAN offline: ISO 13616 checksum (mod 97), registered length for the country, and a normalised and grouped format. $0.003 per call.
- [lei-lookup](https://ambolt.dev/docs/lei-lookup): Look up a Legal Entity Identifier (LEI) record by 20-character LEI, or search legal entities by name and country. $0.005 per call.
- [nordic-company-lookup](https://ambolt.dev/docs/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 per call.
- [package-vulnerabilities](https://ambolt.dev/docs/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 per call.
- [rss-feed-normaliser](https://ambolt.dev/docs/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 per call.
- [sitemap-robots-doctor](https://ambolt.dev/docs/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 per call.
- [solana-token-facts](https://ambolt.dev/docs/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 per call.
- [solana-token-price](https://ambolt.dev/docs/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 per call.
- [solana-token-search](https://ambolt.dev/docs/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 per call.
- [solana-transaction](https://ambolt.dev/docs/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 per call.
- [solana-wallet-balances](https://ambolt.dev/docs/solana-wallet-balances): SOL balance and token holdings of any Solana address, with symbols, USD prices and values, largest first. $0.01 per call.
- [tech-stack-lookup](https://ambolt.dev/docs/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 per call.
- [ted-notices-search](https://ambolt.dev/docs/ted-notices-search): Find recent EU public procurement notices by buyer country, CPV code, keyword and notice type. $0.01 per call.
- [tender-feed](https://ambolt.dev/docs/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 per call.
- [url-metadata](https://ambolt.dev/docs/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 per call.
- [url-to-markdown](https://ambolt.dev/docs/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 per call.
- [us-treasury-rates](https://ambolt.dev/docs/us-treasury-rates): Monthly average interest rates on US Treasury marketable securities (bills, notes, bonds, TIPS, FRNs) Latest months first. $0.003 per call.
- [wikipedia-summary](https://ambolt.dev/docs/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 per call.

## Guides
- [DOI lookup API: paper metadata and citation counts](https://ambolt.dev/use/doi-metadata-and-citation-count-api): Resolve a DOI or a citation string to title, authors, journal, year, publisher, citation count and licence links with one call. Pay per lookup.
- [ENS resolver API: ENS name to address and address to name](https://ambolt.dev/use/ens-name-resolver-api): Resolve an ENS name to its Ethereum address, or look up the primary name of an address, read from the ENS registry on Ethereum mainnet. Pay per call.
- [Wikipedia summary API: lead-section extract by title](https://ambolt.dev/use/wikipedia-summary-api): Get the lead-section summary of a Wikipedia article by title and language: plain-text extract, short description, canonical URL and last-edit time. Pay per call.
- [SSL certificate and domain expiry check API for many domains](https://ambolt.dev/use/ssl-certificate-and-domain-expiry-api): Check SSL certificate and domain registration expiry for one domain or a whole list in one call, with a warning window you choose. Pay per domain.
- [Link preview and Open Graph metadata API](https://ambolt.dev/use/link-preview-and-open-graph-api): Get title, description, canonical URL, Open Graph and Twitter card fields, favicon, language, feeds and JSON-LD types for any public URL. Pay per page.
- [Sitemap and robots.txt audit API](https://ambolt.dev/use/sitemap-and-robots-txt-audit-api): Audit a website robots.txt and XML sitemaps in one call: blocked paths, sitemap health, URL counts, duplicates, off-host URLs and a ranked list of issues. Pay per audit.
- [RSS and Atom feed to JSON API](https://ambolt.dev/use/rss-and-atom-feed-to-json-api): Turn any RSS, Atom or JSON Feed into one clean JSON schema, or give a normal web page and let the feed be discovered. Pay per feed.
- [Danish electricity prices as an API](https://ambolt.dev/use/danish-electricity-prices-api): Hourly and 15-minute day-ahead spot prices for Denmark and neighbouring areas, plus the CO2 intensity of the grid, from one HTTP call.
- [Company registry lookup API for AI agents and KYB](https://ambolt.dev/use/company-registry-api-for-agents): Resolve a company name, domain, registry number, LEI or VAT number to its official legal entity, with status, address, industry codes and LEI. Pay per lookup, no subscription.
- [Validate an IBAN from code](https://ambolt.dev/use/validate-iban-api): Check an IBAN's checksum, country length and format with one call. No account needed, nothing is sent to a bank.
- [EU VAT number validation API](https://ambolt.dev/use/eu-vat-number-validation-api): Check whether an EU VAT number is valid and active, and get the registered name and address where the member state publishes them.
- [Company lookup APIs: LEI and the Nordic registers](https://ambolt.dev/use/company-lookup-api-lei-nordic): Find companies by LEI or name, and look up Norwegian and Finnish company registrations by number. Company-level data only.
- [EU tender alerts by country and CPV code](https://ambolt.dev/use/eu-tender-alerts-api): Search recent EU public procurement notices by buyer country, CPV code and keyword, and run it on a schedule to get new tenders.
- [Exchange rates and central bank rates as an API](https://ambolt.dev/use/exchange-rates-and-interest-rates-api): Euro reference exchange rates for any date since 1999, the ECB key interest rates and US Treasury average rates in one place.
- [Check disposable emails and email DNS from code](https://ambolt.dev/use/disposable-email-and-dns-check-api): Detect temporary-mail domains, role addresses and typos, and inspect MX, SPF and DMARC records, without sending any email.
- [Wallet balances and transaction lookups for Solana and Base](https://ambolt.dev/use/solana-and-base-wallet-api): SOL and token holdings with USD values on Solana, ETH and major tokens on Base, and decoded transaction receipts on both.
- [Solana swap tool for AI agents and bots (MCP and HTTP)](https://ambolt.dev/use/solana-swap-api-for-agents): Quote and build non-custodial Solana swaps from an agent or bot: unsigned transactions only, your wallet signs, one fixed fee shown in every quote.
- [Turn a web page into clean Markdown for an LLM](https://ambolt.dev/use/web-page-to-markdown-api): Fetch a public page and get its main text as Markdown with headings, lists, tables and absolute links. Respects robots.txt.
- [Check an npm or PyPI package for known vulnerabilities](https://ambolt.dev/use/package-vulnerability-check-api): Look up advisories for an exact package version and see the first fixed version and the latest release.
- [Domain registration date, age and expiry from code](https://ambolt.dev/use/domain-age-and-expiry-api): Registration, last-change and expiry dates, status, nameservers and registrar for a domain. No personal contact details.

## Learn
- [CPV codes and OCDS explained: how public tenders are described](https://ambolt.dev/learn/what-are-cpv-codes-and-ocds): CPV codes classify what a public tender buys; OCDS is a standard data format for contracting. A short explanation and how to use both when searching tenders.
- [How EU VAT number validation works (VIES explained)](https://ambolt.dev/learn/how-eu-vat-validation-works): How to check an EU VAT number: format check versus a live VIES check, what the answer means, country prefixes and why results can be slow or temporarily unavailable.
- [What is an LEI (Legal Entity Identifier)? Format, use and lookup](https://ambolt.dev/learn/what-is-an-lei): An LEI is a 20-character global identifier for legal entities. What it contains, who issues it, how it differs from a VAT or registration number and how to look one up.
- [What is KYB (Know Your Business)? Checks, data and limits](https://ambolt.dev/learn/what-is-kyb): KYB means verifying that a company is who it says it is before you do business with it. What the first check looks like, which data it uses and what a lookup cannot tell you.
- [What is MCP (Model Context Protocol)? A plain explanation](https://ambolt.dev/learn/what-is-mcp): MCP is an open protocol that lets AI applications call tools and read data from servers. What it is, how servers and clients talk, and how to add one in a minute.
- [What is x402? HTTP 402 payments for APIs and AI agents](https://ambolt.dev/learn/what-is-x402): x402 turns the HTTP 402 Payment Required status into a payment step a program can complete on its own, with USDC, no account and no API key.

## Comparisons
- [Website screenshot API alternatives](https://ambolt.dev/compare/website-screenshot-api-alternatives): Price and billing model of screenshot APIs next to Ambolt's screenshot Actor. A neutral spec table with the date of each price.
- [Website change detection alternatives](https://ambolt.dev/compare/website-change-detection-alternatives): Per-check price and model of page-change monitors next to Ambolt's change checker.
- [Website technology detection alternatives](https://ambolt.dev/compare/tech-stack-detection-alternatives): Per-lookup price and approach of technology detectors next to Ambolt's tech stack checker.

## Terms
- https://ambolt.dev/terms
- https://ambolt.dev/privacy