Johto Data

Checks and payment terms on this page refer to the first endpoint's example. Other endpoints have not been checked individually.

Base URLhttps://johtodata.com/api

• GET/context-pack$0.01POST documents or text chunks plus a token budget. Returns deduplicated, query-ranked, whitespace-compressed context that fits the budget, with source offsets and a token estimate. Deterministic, no LLM.
  Example

  curl -i 'https://johtodata.com/api/context-pack'

• GET/dataset-check$0.01POST CSV text or JSON rows. Returns inferred schema plus null, missing, duplicate, type-mismatch and numeric outlier findings per column, and a 0-100 quality score. Never changes values.
  Example

  curl -i 'https://johtodata.com/api/dataset-check'

• GET/extract-contacts$0.005Fetch one public web page and return emails, phone numbers and social profile links found on it.
  Example

  curl -i 'https://johtodata.com/api/extract-contacts'

• GET/html-to-rag$0.005POST HTML or a public URL. Strips scripts, styles, nav and footers, converts to Markdown and returns heading-aware chunks with heading paths, token estimates, stable hashes and configurable overlap. For embedding and RAG pipelines. Tables: HTML tables become GitHub-flavored Markdown with a | --- | header row. Nested tables are lifted out as labelled sub-tables under ### Parent row → column headings, with (see Parent → column) in the parent cell. If two nested tables would get the same label, later ones get ', table 2', ', table 3' in document order, so headings stay unique and the same on every run. Pipes in cells are escaped as \|. Links inside cells become [text](url); bold, italic and code markers in the link text are kept; the title attribute is dropped; an href that starts with # is not turned into a link. Example: a Basic row with a nested Limits table becomes | Basic | (see Basic → Limits) | plus a ### Basic → Limits sub-table.
  Example

  curl -i 'https://johtodata.com/api/html-to-rag'

• GET/injection-scan$0.01POST text, HTML or a public URL. Returns a 0-100 prompt-injection risk score with rule hits and exact character spans: instruction overrides, forged role tags, system-prompt leaks, secret exfiltration, hidden HTML text, zero-width and Unicode tag characters. Deterministic, versioned rules.
  Example

  curl -i 'https://johtodata.com/api/injection-scan'

• GET/json-repair$0.005POST broken or LLM-truncated JSON (max 16 KB). Returns valid JSON plus an ordered list of fixes: code fences, comments, single quotes, bare keys, trailing or missing commas, Python literals and unclosed strings, arrays or objects. Valid input is returned unchanged.
  Example

  curl -i 'https://johtodata.com/api/json-repair'

• GET/pii-redact$0.005POST text (max 64 KB). Detects and redacts emails, phone numbers, Luhn-valid card numbers, SSNs, IBANs (mod 97), IPv4/IPv6 addresses, API keys, JWTs, private keys and password assignments. Returns redacted text, per-type counts and findings with offsets. Nothing stored.
  Example

  curl -i 'https://johtodata.com/api/pii-redact'

• GET/schema-diff$0.01POST two JSON Schemas or OpenAPI documents as old and new. Returns breaking and non-breaking changes with JSON pointers and reason codes: removed properties, new required fields, narrowed types, enums and bounds, removed paths, operations, parameters and responses.
  Example

  curl -i 'https://johtodata.com/api/schema-diff'

• GET/url-to-markdown$0.005Fetch one public web page and return clean Markdown plus title. For LLM context and RAG. Tables: HTML tables become GitHub-flavored Markdown with a | --- | header row. Nested tables are lifted out as labelled sub-tables under ### Parent row → column headings, with (see Parent → column) in the parent cell. If two nested tables would get the same label, later ones get ', table 2', ', table 3' in document order, so headings stay unique and the same on every run. Pipes in cells are escaped as \|. Links inside cells become [text](url); bold, italic and code markers in the link text are kept; the title attribute is dropped; an href that starts with # is not turned into a link. Example: a Basic row with a nested Limits table becomes | Basic | (see Basic → Limits) | plus a ### Basic → Limits sub-table.
  Example

  curl -i 'https://johtodata.com/api/url-to-markdown'

• GET/validate-id$0.005POST up to 50 identifiers. Validates IBAN (mod 97), EU/UK/CH/NO VAT format, EAN/UPC/ISBN check digits, card numbers (Luhn, brand), EVM addresses (EIP-55 checksum), Solana base58 addresses, email syntax and E.164 phone numbers. Type auto-detected when omitted. Returns normalized values.
  Example

  curl -i 'https://johtodata.com/api/validate-id'

• GET/x402-lint$0.01POST a URL of an x402 paid endpoint, or a raw PAYMENT-REQUIRED header or 402 JSON body. Returns PASS/WARN/FAIL checks for x402 v1/v2 (header/version, CAIP-2 network, USDC asset, atomic amount, payTo, timeouts, EIP-712) plus optional live checks when url is set: facilitator /supported lists network+scheme, MCP tools/call challenge matches HTTP, and bad input returns charged:false before payment. Each failed check states payment impact (blocks_payment, client_specific, or cosmetic). $0.01.
  Example

  curl -i 'https://johtodata.com/api/x402-lint'

A dash means the listing gives no price or method. {Braces} mark a value you fill in. Copy buttons copy an example URL.