openfang-rail

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Deterministic banking, LEI, VAT, SWIFT & compliance checks via MCP with signed XDR-1 receipts.

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Copy this into your MCP client config:

{
  "mcpServers": {
    "openfang-rail": {
      "url": "https://hcrb.in/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (24)

• crypto_ticker read-only

  Spot USD price for a crypto ticker or CoinGecko id from public price feeds, cached 60 s. Result carries a signed receipt.

  Parameters:

  • symbol (required) — string — Ticker symbol (btc, eth, sol, …) or a CoinGecko asset id (bitcoin, ethereum, …).

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• erc20_balance read-only

  Raw and formatted ERC-20 balanceOf for an address on Base, with decimals read from the token. Result carries a signed receipt.

  Parameters:

  • address (required) — string — Holder EVM address, 0x-prefixed.
  • token_address (required) — string — ERC-20 token contract address, 0x-prefixed.
  • decimals — number — Token decimals override (optional).

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• fx_spot_price_oracle read-only

  Reference fiat and stablecoin conversion rate from a static table, not a live feed. Returns rate and inverse; result carries a signed receipt.

  Parameters:

  • base (required) — string — Base currency symbol (e.g. USDC, EUR, GBP, JPY).
  • quote (required) — string — Quote currency symbol (e.g. USD, EUR, JPY).

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• block_info read-only

  Base block header: number, timestamp, transaction count and base fee for the latest or a given block. Result carries a signed receipt.

  Parameters:

  • block — string — Block number as hex (0x…) or decimal, or a tag (latest/earliest/pending/finalized/safe); defaults to latest.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• tx_activity read-only

  Outbound transaction count (nonce) and contract-or-EOA check for an address on Base. Result carries a signed receipt.

  Parameters:

  • address (required) — string — EVM address, 0x-prefixed.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• token_contract_risk read-only

  Deterministic Base contract facts: ERC-20 metadata, proxy slots, owner(), privileged-function selectors and flags. Not a safety verdict. Result carries a signed receipt.

  Parameters:

  • address (required) — string — Contract address on Base, 0x + 40 hex.
  • chain — string — Optional. Only 'base' (Base mainnet) is supported.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• clean_markdown_scraper read-only

  Fetch a public web page by URL (or take your HTML) and return Markdown plus headings. No JavaScript rendering. Result carries a signed receipt.

  Parameters:

  • url — string — Public http(s) page to fetch (ports 80/443 only). Provide exactly one of url or html.
  • html — string — Raw HTML string to convert instead of fetching a URL (max 1 MiB). Provide exactly one of url or html.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• context_distill read-only

  Deterministic text digest: word count, top-5 most frequent meaningful words (stop words excluded), first sentence, and a keccak-256 content hash. Pure function — no external calls, no ML.

  Parameters:

  • text (required) — string — Arbitrary text to distill (any length; hashing is over the exact input).

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• instant_json_schema_verifier read-only

  Validate JSON data payloads against schema definitions. Preflighted for agent tool call pipelines.

  Parameters:

  • data (required) — object — The JSON data object to validate against the schema.
  • schema (required) — object — The JSON schema object with expected properties and types.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• balance_check read-only

  Native ETH and one ERC-20 balance (default USDC) for an address on Base, raw and formatted. Result carries a signed receipt.

  Parameters:

  • address (required) — string — EVM address, 0x-prefixed.
  • token_address — string — ERC-20 token contract address (optional; defaults to USDC on Base).

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• calculate_fx_savings read-only

  Arithmetic comparison of a USDC settlement against comparator percentages YOU supply (bank_fee_pct, custodial_fee_pct) across 14 global fiat currencies. The comparators are assumptions, not measurements of any bank or provider; no protocol fee is deducted on this rail.

  Parameters:

  • amount — number — Gross invoice settlement volume in USD/USDC (alias).
  • currency — string — Target currency for local comparison (e.g. EUR, GBP, BRL, INR, ARS, PHP, NGN, SGD).
  • amount_usd — number — Gross invoice settlement volume in USD/USDC (alias).
  • amount_usdc — number — Gross invoice settlement volume in USD/USDC.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• iban_check read-only

  Validate IBAN structure and MOD-97 checksum. Does not establish account ownership, beneficiary identity or absence of fraud.

  Parameters:

  • iban (required) — string — IBAN to validate; spaces allowed.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• lei_check read-only

  Validate a 20-character LEI and MOD-97 check digits. No registry lookup, active-registration check or legal-entity identity verification.

  Parameters:

  • lei (required) — string — 20-character Legal Entity Identifier.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• vat_mod97_check read-only

  Check the supported Belgian VAT format and MOD-97 checksum. BE only; not VIES, other EU VAT formats, registration status or tax compliance.

  Parameters:

  • vat_number (required) — string — Belgian VAT id in the supported BE mod-97 format (BE prefix optional); not a VIES lookup.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• swift_bic_check read-only

  Check SWIFT/BIC structure and country code. Does not establish bank existence, active routing or beneficiary identity.

  Parameters:

  • bic (required) — string — SWIFT/BIC code, 8 or 11 characters; spaces/dashes allowed.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• batch_validate read-only

  Run up to 50 supported {tool, value} checks in one request. Each result states its scope. Compare the current batch quote with individual quotes; savings depend on batch size.

  Parameters:

  • items (required) — array — List of {tool, value} checks (max 50).

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• vendor_onboarding_pack read-only

  Check supplied IBAN, LEI, Belgian VAT and UK company-number fields in one result. Structural checks only; no ownership, registry or fraud clearance.

  Parameters:

  • lei — string — Vendor LEI (optional).
  • iban — string — Vendor IBAN (optional).
  • vat_number — string — Vendor VAT number, BE mod-97 (optional).
  • company_number — string — Vendor UK company number (optional).

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• india_supplier_check read-only

  One call, one receipt: GSTIN + PAN + UPI VPA + IFSC for an Indian counterparty. Four deterministic structural checks, each stating its own scope. Built for cross-border procurement where the buyer is an agent that cannot open an INR account.

  Parameters:

  • pan — string — PAN (10 chars, optional)
  • vpa — string — UPI VPA handle (optional)
  • ifsc — string — IFSC bank code (optional)
  • gstin — string — GSTIN (15 chars, optional)

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• pre_disbursement_guard read-only

  Evaluate supplied identifiers, domain-age evidence and mismatch signals. Requires a preceding receipt hash. An advisory result is not verified identity, fraud clearance or authorization to release funds.

  Parameters:

  • lei — string — ISO 17442 Legal Entity Identifier (optional).
  • vat_number — string — EU VAT number (optional).
  • vendor_domain — string — Vendor website domain or invoicing email address (optional).
  • company_number — string — Official corporate registration number, e.g. UK Companies House 8 digits/chars (optional).
  • recipient_iban — string — Recipient bank IBAN (optional).
  • declared_country — string — 2-letter ISO country code where vendor claims to be registered (optional, e.g. 'GB', 'US', 'DE').
  • physical_address — string — Vendor physical office address (optional).
  • prev_receipt_hash — string — Preceding verification receipt hash (may also be passed via X-PREV-RECEIPT-HASH header).
  • invoice_amount_usd — number — Disbursement transaction amount in USD (optional).

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• gstin_check read-only

  Validate an Indian GSTIN by structure (2-digit state code + PAN + entity code + 'Z') and its mod-36 cross-sum checksum.

  Parameters:

  • gstin (required) — string — 15-character Indian Goods and Services Tax Identification Number.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• ifsc_check read-only

  Check the 11-character Indian IFSC format, including its fifth-character zero. No bank-branch registry lookup or account verification.

  Parameters:

  • ifsc (required) — string — 11-character Indian Financial System Code.

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• sanctions_address_screen read-only

  Exact EVM-address comparison against the identified address snapshot and existing operator block policy. Current legal status is unknown; is_sanctioned is null. valid=false preserves a local block; valid=null never authorizes a transaction. Names are not screened. Missing, stale or incomplete evidence is explicit; no UN/EU coverage or sanctions clearance is provided.

  Parameters:

  • subject (required) — string — EVM address (0x...) or ISO 3166-1 country code / jurisdiction name

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• check_price read-only

  Instant zero-cost pricing hook for code402 tools. Returns the live price, an opaque quote_id, TTL, and the settlement URL. Free forever — feeds the price index into an agent planner's context without creating any financial obligation. If the planner acts on the quote, it hits the settlement_url with an EIP-3009 signed voucher.

  Parameters:

  • tool (required) — string — Target tool name (e.g. 'iban-check', 'vendor-onboarding-pack')
  • amount — number — Optional batch count or volume units (default 1)

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

• receipt_verify read-only

  Verifies a signed XDR-1 receipt from ANY x402 service: recomputes the canonical digest and recovers the signer, then compares it to the declared signer. Free forever — no account, no quota, no storage (stateless). A valid receipt proves the signer signed that tool call at that timestamp; it does NOT prove funds moved or any business claim.

  Parameters:

  • receipt (required) — string — The full XDR-1 receipt object: v, tool, tool_version, input_hash, output_hash, payer, recipient, amount, nonce, ts, tier, signer, signature (optional successor/stream_state).

  Hints: read-only yes · destructive not declared · idempotent yes · open-world yes

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