# Stablecoin Gateways (MAINNET)

> Compliance and company data APIs for AI agents: sanctions screening (OFAC, EU, UK, UN), crypto wallet sanctions checks, counterparty and merchant KYB checks with SAM.gov exclusions (US federal debarments), LEI and SEC company facts, WHOIS/domain checks, FX conversion, business days and recalls. Pay per call in USDC on Base or XRP on XRPL over x402 (MPP: XRPL testnet only), no account or API key, every paid response with a signed receipt. Pay per call with x402 (Base USDC, XRPL XRP; Base Sepolia and XRPL testnet also offered for testing) or MPP (XRPL testnet). No account or API key. XRP amounts are pegged to the USD price (live XRP/USD quote, 3% margin, shown in the 402 as extensions.xrp_quote; the quote is the XRP/RLUSD pool price on the XRP Ledger, RLUSD taken as 1 USD).

Every paid call returns { data, receipt }. The receipt is Ed25519-signed and hash-chained in a public log; verify it free with POST /v1/verify-receipt. An unpaid request with no query parameters returns the 402 price quote; malformed parameters return 400 before any payment is requested. Payment is only settled after the answer is produced, so errors are never charged.

## Endpoints
- [domain-facts-v1](https://api.stablecoingateways.com/v1/domain-facts?domain=example.com): $0.003/call. Domain lookup and due diligence (DNS, WHOIS/RDAP, email security): give a domain or hostname, get DNS records (A, AAAA, MX, NS, TXT, CAA), SPF, DMARC, DKIM and MTA-STS email-auth posture, HTTPS/HSTS status, and registrar, creation and expiry dates from registry RDAP. Use to check a website's setup, email deliverability or domain age before trusting it. No personal data. Signed receipt. Source: Live DNS (Cloudflare DoH); registry data from public RDAP via the IANA bootstrap (Verisign for .com/.net), cached 24 h under a low daily query cap.
- [sec-company-facts-v1](https://api.stablecoingateways.com/v1/sec/company-facts?ticker=AAPL): $0.003/call. SEC EDGAR company lookup by stock ticker or CIK: revenue, net income, assets, liabilities, equity, cash, EPS and shares from the latest 10-K/10-Q XBRL data, plus recent 10-K, 10-Q and 8-K filings with links, exchange, state of incorporation and industry (SIC). Use when you need a US public company's fundamentals, filings or identity. Signed receipt. Source: SEC EDGAR data.sec.gov (public).
- [sanctions-screen-v1](https://api.stablecoingateways.com/v1/sanctions/screen?name=Huawei+Technologies&lists=all): $0.005/call. Sanctions screening (OFAC, EU, UK, UN): is a company, organisation, vessel (name or IMO), aircraft or crypto wallet address sanctioned? Screens the official US OFAC SDN and Consolidated lists, the EU consolidated financial sanctions list and the UK Sanctions List, flagging UN Security Council designations, with fuzzy name and alias matching; returns matches, scores, programs and each list's date. Entities only, not individuals. Use for KYB, AML, vendor and pre-payment screening. Data lookup, not a compliance determination. Signed receipt. Source: Official OFAC Sanctions List Service files (SDN + Consolidated), US Treasury; EU consolidated financial sanctions list (European Commission Financial Sanctions Files); UK Sanctions List (FCDO, Open Government Licence v3.0); UN Security Council designations as carried in the UK and EU lists. trade.gov Consolidated Screening List only as a labelled OFAC fallback (with ITA notice).
- [page-to-markdown-v1](https://api.stablecoingateways.com/v1/page-to-markdown?url=https%3A%2F%2Fexample.org%2F): $0.002/call. Web page to markdown: give a public URL, get its main content as clean Markdown for LLMs (navigation, footers and scripts removed) with title, canonical URL, language, publish date and links. Use when an agent needs to read, quote or summarise a page. Respects robots.txt, ai.txt and noai; no paywall bypass; refusals are not charged. Signed receipt. Source: Buyer-supplied public URL; honours robots.txt, ai.txt, X-Robots-Tag, noai/noindex meta and a terms blocklist.
- [business-days-v1](https://api.stablecoingateways.com/v1/business-days?calendar=US-NY&op=add&date=2026-12-23&days=3): $0.001/call. Business days and public holidays: check if a date is a business day, add or subtract N business days, count business days between dates, or list holidays, for 250 countries, 630 subdivisions (e.g. US-NY, GB-ENG) and 31 stock exchanges, 2025-2030. Use for payment due dates, T+N settlement, delivery estimates and SLAs. Data: python-holidays (MIT). Signed receipt. Source: python-holidays, MIT License, Copyright (c) Vacanza Team and individual contributors; Copyright (c) dr-prodigy 2017-2023; Copyright (c) ryanss 2014-2017 (https://github.com/vacanza/holidays).
- [fx-reference-rates-v1](https://api.stablecoingateways.com/v1/fx/rates?base=USD&symbols=EUR%2CGBP%2CJPY): $0.001/call. Currency exchange rates from the European Central Bank: euro reference rates for 29 currencies plus EUR (USD, GBP, JPY, CHF, CNY...), latest or any day in the last 90 days, with cross rates for any base and optional amount conversion (e.g. 100 USD to EUR). Use for invoicing, pricing and reporting. Reference rates, not transaction rates. Source: ECB; free at ecb.europa.eu. Signed receipt. Source: European Central Bank euro foreign exchange reference rates. Source: ECB. This information may be obtained free of charge at https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html.
- [lei-lookup-v1](https://api.stablecoingateways.com/v1/lei?lei=HWUPKR0MPOU8FGXBT394): $0.002/call. LEI lookup (GLEIF): find a company's Legal Entity Identifier by legal name, or get the full record by LEI: legal name, jurisdiction, entity and registration status, registered and headquarters address, and direct and ultimate parent companies. Use for KYB, company identity verification, counterparty identification and corporate ownership checks. Global coverage, CC0 data. Signed receipt. Source: GLEIF API (CC0).
- [product-recalls-us-v1](https://api.stablecoingateways.com/v1/recalls?q=stroller&source=cpsc): $0.002/call. Product recall check (US): has a product or brand been recalled? Searches CPSC consumer product recalls and FDA food, drug and medical device enforcement reports (openFDA) in one call; returns hazard or reason, remedy, date, FDA recall class and agency link. Use for product safety, e-commerce listing and procurement checks. Signed receipt. Source: CPSC Recalls API (public), openFDA enforcement (CC0).
- [us-rates-macro-v1](https://api.stablecoingateways.com/v1/us/rates-macro?series=treasury%2Ccpi): $0.002/call. US Treasury yields and inflation data: daily Treasury par yield curve (1-month to 30-year) plus BLS CPI, core CPI, unemployment rate and nonfarm payrolls for the last 13 months with year-over-year change. Use when a finance agent needs current US interest rates, inflation or jobs data. Sources: US Treasury, BLS (public). Signed receipt. Source: US Treasury Daily Par Yield Curve (public), BLS Public Data API v2 (public domain; cite BLS). BLS.gov cannot vouch for the data or analyses derived from these data after the data have been retrieved from BLS.gov..
- [whois-v1](https://api.stablecoingateways.com/v1/whois?domain=example.com): $0.003/call. WHOIS / RDAP domain lookup: give a domain, get registrar, registration (creation), expiry and last-updated dates, status codes and nameservers from the registry's RDAP service, plus DNS records and SPF/DMARC/DKIM email-auth posture. Use to check a domain's age, registrar or expiry before trusting a merchant, vendor or counterparty. No personal data. Signed receipt. Source: Registry data from public RDAP via the IANA bootstrap (Verisign for .com/.net), cached 24 h; live DNS (Cloudflare DoH). Alias of /v1/domain-facts.
- [fx-convert-v1](https://api.stablecoingateways.com/v1/fx/convert?from=USD&to=EUR%2CGBP%2CJPY&amount=250): $0.001/call. Currency converter (ECB reference rates): convert an amount from one currency to one or more others, e.g. 250 USD to EUR, GBP and JPY, at the latest European Central Bank rate or any day in the last 90 days. Returns the rate, converted amount and rate date for each target. 30 currencies. Reference rates, not transaction rates. Source: ECB. Signed receipt. Source: European Central Bank euro foreign exchange reference rates. Source: ECB. This information may be obtained free of charge at https://www.ecb.europa.eu/stats/policy_and_exchange_rates/euro_reference_exchange_rates/html/index.en.html.
- [merchant-check-v1](https://api.stablecoingateways.com/v1/merchant-check?domain=apple.com&name=Apple+Inc.): $0.01/call. Merchant check (KYB facts) before an agent pays: give a merchant's domain and optionally its company name, get neutral sourced facts in one call for merchant verification and vendor due diligence: domain registration date and age, expiry and registrar (registry RDAP), DNS and SPF/DMARC email-auth, an OFAC sanctions screen of the name, GLEIF LEI match and SEC EDGAR match. No risk score or fraud verdict. Signed receipt. Source: Registry RDAP via IANA bootstrap; DNS via Cloudflare DoH; official OFAC SDN + Consolidated lists (US Treasury); GLEIF (CC0); SEC EDGAR (public). Same engines as /v1/whois, /v1/sanctions/screen, /v1/lei and /v1/sec/company-facts.
- [sanctions-address-v1](https://api.stablecoingateways.com/v1/sanctions/address?address=0x098B716B8Aaf21512996dC57EB0615e2383E2f96): $0.002/call. Crypto wallet sanctions check (OFAC): is this blockchain address on the US Treasury OFAC sanctions lists? Exact match against all 1,000+ digital currency addresses OFAC publishes on SDN and Consolidated entries (Bitcoin, Tron, Ethereum and EVM chains, USDT, Litecoin, Monero and more), returning the listing's program and entry ID. Use before sending or accepting a crypto payment. No tracing or risk scoring. Signed receipt. Source: Official OFAC Sanctions List Service files (SDN + Consolidated), US Treasury: 'Digital Currency Address' identifiers.
- [counterparty-check-v1](https://api.stablecoingateways.com/v1/counterparty-check?name=Siemens+Aktiengesellschaft&domain=siemens.com&vat=DE129274202): $0.01/call. Counterparty check (KYB preflight) in one call: give any of a company name, domain, LEI or crypto wallet address (plus an optional EU VAT number), get neutral sourced facts for vendor onboarding and supplier due diligence: sanctions screen of the name on OFAC, EU and UK lists with UN designations flagged, US federal exclusions (SAM.gov debarments and suspensions of firms, by name or UEI), OFAC wallet check, GLEIF LEI match and status, domain age, registrar and email-auth, and an EU VAT number format check. No risk score or verdict. Signed receipt. Source: OFAC SDN + Consolidated (US Treasury); EU Financial Sanctions Files (European Commission); UK Sanctions List (FCDO, OGL v3.0); SAM.gov Exclusions public extract (GSA; some records contain D&B Open Data, source: Dun & Bradstreet); GLEIF (CC0); registry RDAP via IANA bootstrap; DNS via Cloudflare DoH. Same engines as /v1/sanctions/screen, /v1/sanctions/address, /v1/lei and /v1/whois.

## Evidence and receipts
- Provenance: counterparty-check, sanctions-screen, lei-lookup, sanctions-address, merchant-check, domain-facts, whois, sec-company-facts, product-recalls-us, page-to-markdown, fx-reference-rates, fx-convert, us-rates-macro, business-days add a `provenance` block (sg-provenance/1) to data. Each fact says what a named public source showed, the source URL, when we retrieved it (retrieved_at; null for a static rule table), the source's own as-of date where it has one, and the limits of that fact. Evidence only: no score, rating, verdict or recommendation. Existing response fields are unchanged. Every paid endpoint carries it.
- Receipt evidence: new receipts carry a signed `evidence` object: service_version, data_timestamp (oldest retrieval time of the data served), validation (checks run before settlement, e.g. input=pass;freshness=pass;output=pass;provenance=pass), terms_version, terms_hash (sha256 of the applicable terms text; a placeholder label means no binding terms are published yet) and provenance_hash (sha256 of the canonical data.provenance: JSON with keys sorted at every level, no whitespace). Receipts issued before 2026-10-24 have no evidence.
- Verify: recompute provenance_hash from data.provenance, then POST the receipt to /v1/verify-receipt.

## MCP
- Remote MCP server (Streamable HTTP): https://api.stablecoingateways.com/mcp. Every endpoint above is a tool; paid tools follow the x402 MCP transport (unpaid call returns PaymentRequired with isError:true; retry with params._meta["x402/payment"]). Free tools: catalog, health, verify_receipt.

## Contact
- Email: hello@stablecoingateways.com

## Docs
- [OpenAPI](https://api.stablecoingateways.com/openapi.json)
- [x402 discovery](https://api.stablecoingateways.com/.well-known/x402)
- [Catalog](https://api.stablecoingateways.com/v1/catalog)
- [Status and uptime](https://api.stablecoingateways.com/status)
- [Verify a receipt](https://api.stablecoingateways.com/v1/verify-receipt) (POST, free)
- [Receipt public key](https://api.stablecoingateways.com/.well-known/receipt-key)