Best Developer Tools APIs (2026)

Stack Overflow includes 87 actions (questions, question, answers). Stack Overflow The primary catalog return is paginated questions by sort/tag; returns score, tags, body, owner/link attribution.

GitHub Developer Data includes 39 actions (user, user_repos, user_followers). GitHub Developer Data The primary catalog return is github user profile.

Developer Utilities includes 21 actions (hash, uuid, encode). Developer Utilities The primary catalog return is hash/checksum text or binary (base64/hex) input: md5…sha3·blake2·crc32·adler32, optional hmac k....

Generation includes 21 actions (pdf_render, pdf_from_html, pdf_from_url). Generation The primary catalog return is render a pdf from inline html/css (jinja2) or a built-in template_name + data (invoice/receipt/....

Product Hunt includes 13 actions (posts, post, reviews). Product Hunt The primary catalog return is today's or historical leaderboard launches (daily/weekly/monthly/yearly).

Email Deliverability & DNS Health includes 12 actions (check, spf, dmarc). Email Deliverability & DNS Health The primary catalog return is full email-health audit: spf + dkim + dmarc + mx + bimi + mta-sts + tls-rpt + dnssec + blacklis....

Email Preflight includes 7 actions (audit_html, css_support, spam_score). Email Preflight The primary catalog return is full pre-send structure + accessibility + deliverability lint of an html email: missing alt tex....

Package Registries includes 7 actions (package, versions, version). Package Registries The primary catalog return is full package metadata (latest version normalized).

Service Status & Incident includes 7 actions (status, incidents, components). Service Status & Incident The primary catalog return is current overall status for a vendor → normalized indicator (operational/degraded/partial_outage....

Vulnerability & Dependency Intelligence includes 7 actions (package_vulns, vuln_detail, advisory_search). Vulnerability & Dependency Intelligence The primary catalog return is all known vulnerabilities affecting a package (by name+ecosystem, optionally pinned to an insta....

Web Archive includes 7 actions (snapshots, available, history). Web Archive The primary catalog return is all wayback captures for a url (timestamp, status, mimetype, digest, archival size, snapshot_ur....

Domain Risk includes 6 actions (assess, age, parked). Domain Risk The primary catalog return is comprehensive fraud and security risk report for one domain: a 0-100 risk score, human-readable....

MCP Server & Agent-Skill Registry includes 6 actions (search, server_detail, skill_detail). MCP Server & Agent-Skill Registry The primary catalog return is normalized cross-registry search over the official mcp registry, glama and smithery (and skills....

Change-Detect includes 5 actions (snapshot, diff, monitor_check). Change-Detect The primary catalog return is fetch a url and return a noise-resistant fingerprint: content_hash (normalised main content, ro....

Threat Intelligence includes 5 actions (url_check, domain_reputation, ip_reputation). Threat Intelligence The primary catalog return is is a url malicious? checks the urlhaus malware-url feed + openphish phishing feed (exact + vari....

Web Extract includes 5 actions (scrape, map, crawl). Web Extract The primary catalog return is fetch one url and return its content in the formats you choose (markdown, plain text, cleaned h....

Package & Dependency Trust includes 4 actions (package_trust, repo_trust, lockfile_scan). Package & Dependency Trust The primary catalog return is ecosystem+package → registry metadata + downloads + maintainers + license + resolved repository....

Passive OSINT & Recon includes 4 actions (subdomains, domain, ip). Passive OSINT & Recon The primary catalog return is passive subdomain discovery across crt.sh + certspotter + otx + hackertarget + wayback, deduped....