_done

name: _done
description: '_done is an agent-native catalog of 26 single-purpose utility REST APIs — network and DNS lookups, domain intelligence,
  email-authentication checks, HTTP and SEO inspection, OCR, screenshots, hashing, JSON tooling, web3 resolution and finance
  calculators. There are no accounts, no signups and no API keys: every call is metered individually at $0.01 in USDC over
  the x402 protocol, settled on Base Mainnet or Solana Mainnet through the Coinbase CDP facilitator. Each service runs on
  its own subdomain, exposes a single POST operation, and publishes its own OpenAPI 3.1.0 spec annotated for AI agents with
  x-ai-instructions, x-guidance, x-pricing and x-402 payment metadata. Discovery is served from /.well-known/x402.json, /llms.txt,
  robots.txt and sitemap.xml. There is no MCP server, no A2A agent card, no SDK, no changelog, no status page and no published
  terms of service.'
image: https://underscoredone.com/logo.png
url: https://done.apievangelist.com/apis.yml
created: '2026-08-10'
modified: '2026-08-11'
specificationVersion: '0.21'
tags:
- developer-tools
- utility-apis
- ai-agents
- agent-native
- x402
- pay-per-call
- web3
- crypto-payments
- dns
- domains
- email-security
- network-security
- seo
- ocr
- data
- fintech-calculators
apis:
- name: _done Catalog
  description: Single-page agent-native catalog of the 26 _done pay-per-call utility APIs. Publishes a real llms.txt, a robots.txt,
    a sitemap.xml and an x402 resource manifest at /.well-known/x402.json listing every payment-gated endpoint with its price,
    chain, asset, payTo address, OpenAPI URL and info page. The aggregate https://underscoredone.com/openapi.json is a valid
    OpenAPI 3.1.0 document but its paths object is EMPTY — the real contracts are the 26 per-service specs on the service
    subdomains.
  humanURL: https://underscoredone.com
  baseURL: https://underscoredone.com
  tags:
  - api-catalog
  - agent-native
  - llms-txt
  - x402
  - discovery
  - pay-per-call
  properties:
  - type: Documentation
    url: https://underscoredone.com
  - type: LLMsTxt
    url: llms/done-llms.txt
  - type: WellKnown
    url: well-known/done-well-known.yml
- name: ASN Lookup
  description: 'Look up the network operator, country, and address block behind any IP address or ASN number. Given an internet
    address (IP) or a network identification number (ASN), this tool returns who operates that piece of the internet: the
    network number, the owner''s name, the country it''s registered in, the regional registry that manages it, and the exact
    address range it belongs to. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI
    3.1.0; 1 operation(s): POST /lookup.'
  humanURL: https://underscoredone.com/asn_lookup/
  baseURL: https://asn-lookup.underscoredone.com
  tags:
  - network
  - asn
  - lookup
  - ip-address
  - autonomous-system
  - threat-intel
  - abuse-reporting
  - infrastructure-mapping
  - whois
  - cidr
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/asn_lookup/
  - type: APIReference
    url: https://underscoredone.com/asn_lookup/
  - type: OpenAPI
    url: openapi/done-asn-lookup-openapi.yml
  - type: OpenAPI
    url: https://asn-lookup.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-asn-lookup-overlay.yaml
- name: BIMI Checker
  description: 'Checks whether a website''s email branding setup is correct so its logo shows up in inboxes. Checks one or
    more website addresses to see if they are properly set up to show a brand logo next to emails in inboxes like Gmail, Apple
    Mail, and Yahoo. It looks up the special settings the domain has published, checks that the logo picture follows the required
    format, checks that a security certificate for the logo (if any) is valid and not expired, and confirms the domain has
    strict enough email protection rules turned on. It returns a clear pass or fail for each domain along with a plain list
    of what is broken if something fails. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key.
    OpenAPI 3.1.0; 1 operation(s): POST /check.'
  humanURL: https://underscoredone.com/bimi_checker/
  baseURL: https://bimi-checker.underscoredone.com
  tags:
  - bimi
  - bimi-checker
  - email-branding
  - dmarc
  - vmc-certificate
  - email-authentication
  - brand-indicators-for-message-identification
  - logo-validation
  - email-deliverability
  - svg-validation
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/bimi_checker/
  - type: APIReference
    url: https://underscoredone.com/bimi_checker/
  - type: OpenAPI
    url: openapi/done-bimi-checker-openapi.yml
  - type: OpenAPI
    url: https://bimi-checker.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-bimi-checker-overlay.yaml
- name: CORS Header Checker
  description: 'Send a URL and origin, get back exactly which cross-origin permissions that server grants. Sends a real request
    to any URL you provide, attaches an Origin header, and reads back all six standard cross-origin permission headers the
    server returns. Tells you whether cross-origin requests are enabled at all, whether your specific origin is permitted,
    and shows you every permission value exactly as the server sent it. Perfect for figuring out why a browser is blocking
    a request, confirming a freshly deployed service is configured correctly, or auditing whether a public API allows credentialed
    cross-origin calls. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1
    operation(s): POST /check.'
  humanURL: https://underscoredone.com/cors_header_checker/
  baseURL: https://cors-header-checker.underscoredone.com
  tags:
  - network
  - cors
  - header
  - checker
  - cross-origin
  - access-control
  - cors-debug
  - browser-blocked
  - preflight
  - origin-allowed
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/cors_header_checker/
  - type: APIReference
    url: https://underscoredone.com/cors_header_checker/
  - type: OpenAPI
    url: openapi/done-cors-header-checker-openapi.yml
  - type: OpenAPI
    url: https://cors-header-checker.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-cors-header-checker-overlay.yaml
- name: US CPI Data & Inflation Report
  description: 'Returns the latest, a specific month''s, or a historical range of official US inflation (CPI) figures from
    BLS . Gives you official United States inflation numbers from the government''s BLS Consumer Price Index. Ask for the
    newest reading, a specific month in the past, or a whole range of months, and get back clear percentages for overall inflation
    and ''core'' inflation (which ignores food and energy prices), plus a plain-English summary sentence. Pay-per-call at
    $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /cpi.'
  humanURL: https://underscoredone.com/cpi_report_us/
  baseURL: https://cpi-report-us.underscoredone.com
  tags:
  - cpi-report
  - cpi-consumer-price-index
  - consumer-index-number
  - consumer-index-price
  - consumer-index-rate
  - consumer-price-index-figures
  - cpi-index-report
  - cpi-price-index
  - current-price-index
  - price-index-consumer
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/cpi_report_us/
  - type: APIReference
    url: https://underscoredone.com/cpi_report_us/
  - type: OpenAPI
    url: openapi/done-cpi-report-us-openapi.yml
  - type: OpenAPI
    url: https://cpi-report-us.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-cpi-report-us-overlay.yaml
- name: Curl HTTP Request
  description: 'Make a real HTTP request from the cloud and get back the status code, headers, and body instantly. Send an
    HTTP request to any URL from our servers and receive the full response — including the status code, all response headers,
    and the body content. Supports GET, POST, PUT, PATCH, DELETE, and HEAD. Automatically follows up to 3 redirects. Useful
    for testing endpoints, verifying servers are responding correctly, debugging redirect chains, or fetching raw data without
    needing a local setup. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0;
    1 operation(s): POST /curl.'
  humanURL: https://underscoredone.com/curl_http_request/
  baseURL: https://curl-http-request.underscoredone.com
  tags:
  - network
  - curl
  - http-request
  - fetch-url
  - check-endpoint
  - status-code
  - response-headers
  - redirect-follow
  - api-tester
  - debug-server
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/curl_http_request/
  - type: APIReference
    url: https://underscoredone.com/curl_http_request/
  - type: OpenAPI
    url: openapi/done-curl-http-request-openapi.yml
  - type: OpenAPI
    url: https://curl-http-request.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-curl-http-request-overlay.yaml
- name: Directory Submission Lite
  description: 'Places an order to have a website submitted to twenty directories, returning a confirmation number to track
    it. Places an order to have a website submitted to twenty directories that publish a link back to it, and returns a confirmation
    number so the order can be checked later for free. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account,
    no API key. OpenAPI 3.1.0; 2 operation(s): POST /submit, POST /status.'
  humanURL: https://underscoredone.com/directory_submission_lite/
  baseURL: https://directory-submission-lite.underscoredone.com
  tags:
  - network
  - directory-submission
  - backlinks
  - seo
  - indexing
  - link-building
  - new-website
  - search-engine-discovery
  - site-submission
  - order
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/directory_submission_lite/
  - type: APIReference
    url: https://underscoredone.com/directory_submission_lite/
  - type: OpenAPI
    url: openapi/done-directory-submission-lite-openapi.yml
  - type: OpenAPI
    url: https://directory-submission-lite.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-directory-submission-lite-overlay.yaml
- name: Bulk DMARC Record Lookup
  description: 'Check email security (DMARC) configuration for one or many domains in a single request. Give this tool a list
    of domain names and it will instantly check each one''s DMARC email security record. DMARC is a standard that tells email
    providers how to handle fake or spoofed emails pretending to come from your domain. For each domain you submit, you get
    back whether a valid record exists, what the policy is (none, quarantine, or reject), whether reporting addresses are
    set up, and the full raw record text. Perfect for auditing many domains at once without any setup. Pay-per-call at $0.01
    USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /dmarc-lookup.'
  humanURL: https://underscoredone.com/dmarc_lookup/
  baseURL: https://dmarc-lookup.underscoredone.com
  tags:
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/dmarc_lookup/
  - type: APIReference
    url: https://underscoredone.com/dmarc_lookup/
  - type: OpenAPI
    url: openapi/done-dmarc-lookup-openapi.yml
  - type: OpenAPI
    url: https://dmarc-lookup.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-dmarc-lookup-overlay.yaml
- name: DNS & WHOIS Lookup
  description: 'Look up all 13 DNS record types plus full WHOIS registration data for up to 10 domains in one call. Send up
    to 10 domain names and get back every DNS record type (A, AAAA, MX, CNAME, TXT, NS, PTR, SOA, SRV, CAA, NAPTR, DS, TLSA)
    plus the full WHOIS registration profile (registrar, dates, contacts, status, nameservers) for each one. URLs are accepted
    and automatically stripped down to the bare domain. Duplicate domains are quietly removed before processing. Results come
    back as one flat row per domain, ready to drop into a spreadsheet, database, or pipeline. Pay-per-call at $0.01 USDC over
    x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /lookup.'
  humanURL: https://underscoredone.com/dns_whois_lookup/
  baseURL: https://dns-whois-lookup.underscoredone.com
  tags:
  - network
  - dns
  - whois
  - domain-lookup
  - dns-records
  - domain-audit
  - mx-record
  - spf-dkim-dmarc
  - domain-expiry
  - migration-verification
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/dns_whois_lookup/
  - type: APIReference
    url: https://underscoredone.com/dns_whois_lookup/
  - type: OpenAPI
    url: openapi/done-dns-whois-lookup-openapi.yml
  - type: OpenAPI
    url: https://dns-whois-lookup.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-dns-whois-lookup-overlay.yaml
- name: Domain Age Checker
  description: 'Give it a list of domains and get back registration date, expiration date, age, and time remaining — instantly.
    Send a list of domain names and this tool tells you exactly how old each one is, when it was first registered, when it
    expires, and how much time is left before expiration. Great for spotting brand-new suspicious domains, researching competitors,
    or evaluating domains before buying or linking to them. Works with over 100 domain extensions worldwide. Pay-per-call
    at $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /lookup.'
  humanURL: https://underscoredone.com/domain_age_checker/
  baseURL: https://domain-age-checker.underscoredone.com
  tags:
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/domain_age_checker/
  - type: APIReference
    url: https://underscoredone.com/domain_age_checker/
  - type: OpenAPI
    url: openapi/done-domain-age-checker-openapi.yml
  - type: OpenAPI
    url: https://domain-age-checker.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-domain-age-checker-overlay.yaml
- name: Domain Availability Checker
  description: 'Check whether 1–10 domain names have an active registration record using the official RDAP protocol. Give
    this API up to 10 domain names and it will tell you whether each one has a registration record on file with the official
    registry. It uses RDAP — the modern, structured replacement for WHOIS — so there is no messy free-text parsing. Each domain
    comes back labeled ''registered'', ''unregistered'', or ''indeterminate'' (when the registry does not support RDAP for
    that ending). Important: ''unregistered'' means no record was found, which usually means the name is available — but reserved
    or premium names can also return no record. This API tells you registration status only; it does not tell you price, premium
    status, or whether a registrar will actually let you buy the name. Pay-per-call at $0.01 USDC over x402 on Base or Solana
    — no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /check.'
  humanURL: https://underscoredone.com/domain_availability_checker/
  baseURL: https://domain-availability-checker.underscoredone.com
  tags:
  - network
  - domain
  - availability
  - checker
  - rdap
  - whois
  - domain-lookup
  - tld
  - registration-status
  - name-search
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/domain_availability_checker/
  - type: APIReference
    url: https://underscoredone.com/domain_availability_checker/
  - type: OpenAPI
    url: openapi/done-domain-availability-checker-openapi.yml
  - type: OpenAPI
    url: https://domain-availability-checker.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-domain-availability-checker-overlay.yaml
- name: ENS Resolver
  description: 'Resolve an ENS name to an Ethereum address, or an address back to its ENS name. Look up an ENS name or an
    Ethereum address and get back the matching one, automatically figuring out which direction you need. Pay-per-call at $0.01
    USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /resolve.'
  humanURL: https://underscoredone.com/ens_resolver/
  baseURL: https://ens-resolver.underscoredone.com
  tags:
  - network
  - ens
  - resolver
  - ethereum
  - wallet-address
  - ens-name-lookup
  - blockchain-identity
  - reverse-resolve
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/ens_resolver/
  - type: APIReference
    url: https://underscoredone.com/ens_resolver/
  - type: OpenAPI
    url: openapi/done-ens-resolver-openapi.yml
  - type: OpenAPI
    url: https://ens-resolver.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-ens-resolver-overlay.yaml
- name: Hacker News Data
  description: 'Fetch Hacker News stories by category, or scan all stories/jobs/polls from a specific date, with optional
    nested comments. This tool reads live information from Hacker News, a popular website where people share and discuss technology
    news. You can either ask for a current list of stories (like the Top, New, Best, Ask, Show, or Job lists) or ask for every
    story, job posting, and poll that was posted on one specific calendar day in the past. You can also choose to pull in
    the discussion comments underneath each story, including nested replies several levels deep. Pay-per-call at $0.01 USDC
    over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /fetch.'
  humanURL: https://underscoredone.com/hackernews_data/
  baseURL: https://hackernews-data.underscoredone.com
  tags:
  - network
  - hackernews
  - hacker-news
  - hn-api
  - stories
  - comments
  - jobs
  - polls
  - date-scan
  - developer-news
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/hackernews_data/
  - type: APIReference
    url: https://underscoredone.com/hackernews_data/
  - type: OpenAPI
    url: openapi/done-hackernews-data-openapi.yml
  - type: OpenAPI
    url: https://hackernews-data.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-hackernews-data-overlay.yaml
- name: Hashing, HMAC & Checksum Suite
  description: 'Compute cryptographic hashes, HMAC signatures, and checksums — and verify webhook signatures with constant-time
    comparison. Give this API any text or binary data and it instantly returns its fingerprint under whichever hash algorithms
    you choose — SHA-256, SHA-512, MD5, BLAKE2, CRC32, and more. It also signs data with a secret key (HMAC) and, most importantly,
    safely verifies whether an incoming signature matches — using a timing-safe comparison that prevents secret-leaking attacks.
    Language models cannot perform hashing: they produce a string of the right length and character set that looks correct
    but is simply wrong. Every webhook verification, idempotency key, cache fingerprint, or integrity check that relies on
    a hallucinated hash is silently broken. This API is the cure. Pay-per-call at $0.01 USDC over x402 on Base or Solana —
    no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /hash.'
  humanURL: https://underscoredone.com/hash_hmac/
  baseURL: https://hash-hmac.underscoredone.com
  tags:
  - security
  - hash
  - hmac
  - checksum
  - sha256
  - webhook-verification
  - content-fingerprint
  - idempotency-key
  - signature-verify
  - blake2
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/hash_hmac/
  - type: APIReference
    url: https://underscoredone.com/hash_hmac/
  - type: OpenAPI
    url: openapi/done-hash-hmac-openapi.yml
  - type: OpenAPI
    url: https://hash-hmac.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-hash-hmac-overlay.yaml
- name: HTTP Header Checker
  description: 'Fetches any web address and returns its response headers, status code, and redirect path. Sends a request
    to a web address you provide and reports back everything the server said in response: the status code, all the response
    headers, how many times it got redirected, and how long the whole thing took. Pay-per-call at $0.01 USDC over x402 on
    Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s): POST /check.'
  humanURL: https://underscoredone.com/http_header_checker/
  baseURL: https://http-header-checker.underscoredone.com
  tags:
  - network
  - http-header-checker
  - headers
  - url-lookup
  - redirect-check
  - security-headers
  - cache-control
  - status-code
  - web-debugging
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/http_header_checker/
  - type: APIReference
    url: https://underscoredone.com/http_header_checker/
  - type: OpenAPI
    url: openapi/done-http-header-checker-openapi.yml
  - type: OpenAPI
    url: https://http-header-checker.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-http-header-checker-overlay.yaml
- name: HTTP Status Code Checker
  description: 'Check the live status of up to 10 URLs at once and detect redirects instantly. Give this API a list of up
    to 10 web addresses and it will visit each one to tell you whether it is working, broken, or redirecting visitors somewhere
    else. You get back the exact status number (like 200 for OK, 404 for not found, 500 for server error), whether the address
    redirects, and where it redirects to. Great for finding broken links, verifying website migrations, and running quick
    SEO audits without writing any code. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key.
    OpenAPI 3.1.0; 1 operation(s): POST /check.'
  humanURL: https://underscoredone.com/http_status_checker/
  baseURL: https://http-status-checker.underscoredone.com
  tags:
  - network
  - http
  - status
  - checker
  - redirect
  - broken-links
  - seo-audit
  - link-validation
  - website-migration
  - url-health
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/http_status_checker/
  - type: APIReference
    url: https://underscoredone.com/http_status_checker/
  - type: OpenAPI
    url: openapi/done-http-status-checker-openapi.yml
  - type: OpenAPI
    url: https://http-status-checker.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-http-status-checker-overlay.yaml
- name: JSON Validate, Repair, Convert, Query & Diff
  description: 'One endpoint to validate, repair, format, query, diff, convert, and canonicalize JSON — the most common operation
    in every agent workflow. Every AI agent and developer runs into broken or confusing JSON constantly. This tool handles
    all the most common JSON headaches in one place: check if JSON is valid (with exact error location), fix near-JSON that
    has typos or formatting mistakes, pretty-print or minify, pull out specific values using a path expression, compare two
    JSON documents and see exactly what changed, convert to and from YAML or CSV, produce a byte-stable canonical form for
    hashing or signing, validate against a schema, and get size and structure statistics. Same input always gives the same
    output — fully predictable, no side effects. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API
    key. OpenAPI 3.1.0; 1 operation(s): POST /json.'
  humanURL: https://underscoredone.com/json_suite/
  baseURL: https://json-suite.underscoredone.com
  tags:
  - parsing
  - json
  - validate
  - repair
  - jsonpath
  - diff
  - canonicalize
  - convert
  - yaml
  - csv
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/json_suite/
  - type: APIReference
    url: https://underscoredone.com/json_suite/
  - type: OpenAPI
    url: openapi/done-json-suite-openapi.yml
  - type: OpenAPI
    url: https://json-suite.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-json-suite-overlay.yaml
- name: Leetspeak Translator
  description: 'Converts regular text into leetspeak or decodes leetspeak back into normal readable text. Takes a piece of
    text and either turns it into leetspeak (swapping some letters for numbers and symbols, like ''hello'' becoming ''h3110'')
    or turns leetspeak back into normal, easy-to-read words. The same words always produce the same result, so answers never
    change unexpectedly. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1
    operation(s): POST /translate.'
  humanURL: https://underscoredone.com/leetspeak_translator/
  baseURL: https://leetspeak-translator.underscoredone.com
  tags:
  - text
  - leetspeak
  - translator
  - leet
  - encode-text
  - decode-text
  - text-obfuscation
  - character-substitution
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/leetspeak_translator/
  - type: APIReference
    url: https://underscoredone.com/leetspeak_translator/
  - type: OpenAPI
    url: openapi/done-leetspeak-translator-openapi.yml
  - type: OpenAPI
    url: https://leetspeak-translator.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-leetspeak-translator-overlay.yaml
- name: Mortgage & Loan Amortization Calculator
  description: 'Get the exact monthly payment and full period-by-period breakdown for any fixed-rate loan — results an AI
    model cannot reliably compute on its own. Give this API a loan amount, an interest rate, and a repayment term, and it
    hands back the precise monthly payment plus a complete schedule showing — for every single month — how much goes to interest,
    how much reduces the balance, and what you still owe. You can also ask ''what if I pay an extra $300 a month?'' or ''what
    if I make a $10,000 lump payment in month 24?'' and it will tell you exactly how many months you save and how much interest
    you avoid. Every number is computed with banker''s rounding and a pinned arithmetic rule so that two correct systems running
    the same inputs produce identical results, down to the cent. No rate lookups, no market data — you supply the rate, the
    API does the math. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s):
    POST /calculate.'
  humanURL: https://underscoredone.com/mortgage_amortization/
  baseURL: https://mortgage-amortization.underscoredone.com
  tags:
  - math
  - mortgage
  - amortization
  - loan
  - monthly-payment
  - repayment-schedule
  - interest-calculation
  - extra-payment
  - lump-sum
  - real-estate
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/mortgage_amortization/
  - type: APIReference
    url: https://underscoredone.com/mortgage_amortization/
  - type: OpenAPI
    url: openapi/done-mortgage-amortization-openapi.yml
  - type: OpenAPI
    url: https://mortgage-amortization.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-mortgage-amortization-overlay.yaml
- name: OCR Text Extractor
  description: 'Extract text from any image using Tesseract OCR. Send a picture, either as a public web address or as base64-encoded
    image data, and get back the plain text found inside it. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account,
    no API key. OpenAPI 3.1.0; 1 operation(s): POST /read.'
  humanURL: https://underscoredone.com/ocr/
  baseURL: https://ocr.underscoredone.com
  tags:
  - text
  - ocr
  - read
  - image-to-text
  - extract-text
  - screenshot-reader
  - document-scan
  - receipt-reader
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/ocr/
  - type: APIReference
    url: https://underscoredone.com/ocr/
  - type: OpenAPI
    url: openapi/done-ocr-openapi.yml
  - type: OpenAPI
    url: https://ocr.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-ocr-overlay.yaml
- name: TCP Port Scanner
  description: 'Send a host and port range, get back a clean list of which ports are open and what services are running on
    them. Give this API a hostname or IP address and it will try connecting to each port in your requested range. For every
    port that answers, it tells you whether it is open or blocked, which service is likely running there (like a web server
    or SSH), and what software version was detected. This saves you from installing network tools, parsing messy command-line
    output, or writing socket loops yourself. Only scan hosts you own or have permission to scan — this tool does not check
    that for you. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s):
    POST /scan.'
  humanURL: https://underscoredone.com/port_scanner/
  baseURL: https://port-scanner.underscoredone.com
  tags:
  - network
  - port
  - scanner
  - tcp
  - open-ports
  - service-detection
  - nmap
  - infrastructure
  - security-audit
  - firewall-check
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/port_scanner/
  - type: APIReference
    url: https://underscoredone.com/port_scanner/
  - type: OpenAPI
    url: openapi/done-port-scanner-openapi.yml
  - type: OpenAPI
    url: https://port-scanner.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-port-scanner-overlay.yaml
- name: Bulk QR Code Generator
  description: 'Turn a list of text, URLs, or any strings into QR code images instantly — one call, many codes. Send a list
    of texts — website addresses, phone numbers, plain words, WiFi details, anything — and get back a ready-to-use QR code
    image for each one. Every QR code comes as a base64-encoded PNG you can drop straight into a webpage or save to disk.
    Great for marketing campaigns, event tickets, product labels, menus, or any situation where you need many QR codes in
    one go. Empty entries are quietly skipped. Each input is limited to 700 characters. You must send at least one non-empty
    entry. Pay-per-call at $0.01 USDC over x402 on Base or Solana — no account, no API key. OpenAPI 3.1.0; 1 operation(s):
    POST /generate.'
  humanURL: https://underscoredone.com/qr_code_generator/
  baseURL: https://qr-code-generator.underscoredone.com
  tags:
  - x402
  - pay-per-call
  - agent-native
  - utility-apis
  - developer-tools
  properties:
  - type: Documentation
    url: https://underscoredone.com/qr_code_generator/
  - type: APIReference
    url: https://underscoredone.com/qr_code_generator/
  - type: OpenAPI
    url: openapi/done-qr-code-generator-openapi.yml
  - type: OpenAPI
    url: https://qr-code-generator.underscoredone.com/openapi.json
  - type: Overlay
    url: overlays/done-qr-code-generator-overlay.yaml
- name: Screenshots
  description: 'Capture a screenshot of a fully rendered webpage, including JavaScript-heavy pages. Renders a webpage exactly
    as a real browser would, including all its scripts and dynamic content, then takes a picture of it. You can capture just
    the visible area or th

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