openfang-rail

Reliability

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How to connect

Add it to any MCP client that supports remote servers.

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

24 tools

• crypto_ticker

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

• erc20_balance

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

• fx_spot_price_oracle

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

• block_info

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

• tx_activity

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

• token_contract_risk

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

• clean_markdown_scraper

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

• context_distill

  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.

• instant_json_schema_verifier

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

• balance_check

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

• calculate_fx_savings

  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.

• iban_check

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

• lei_check

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

• vat_mod97_check

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

• swift_bic_check

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

• batch_validate

  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.

• vendor_onboarding_pack

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

• india_supplier_check

  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.

• pre_disbursement_guard

  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.

• gstin_check

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

• ifsc_check

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

• sanctions_address_screen

  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…

• check_price

  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…

• receipt_verify

  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…

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