Email and identity verification APIs for AI agents

Email and identity verification APIs let an agent check an address, a phone number or an identity claim before it sends, pays or creates a record. The rule looks at Verification, Data, Tools and Intelligence. The name has to say email, phone, identity or KYC, or the text has to use a phrase such as email verification, email validation, phone validation, identity verification or disposable email. A passing mention of a contact form is not enough. Discovery is free. The check itself is a paid call to the provider over x402, in USDC on Base, Solana or Algorand, with no API key. Settlement-verified means a paid route with an on-chain receipt, and that is what the examples are. Unclaimed (bazaar) imports are shown with their label and are not the examples. If you operate one of these checks, listing is free and you keep 100% of each settled call. The counts are the live number of APIs and endpoints that match the rule.

30 APIs and 521 endpoints match this page. 30 are settlement-verified: a paid route with an on-chain receipt.

Settlement-verified examples

Bulk Email Validation & Verification API · $0.01 · settlement-verified · On-chain receipt
Bulk email validation for lead-list cleaning, CRM cleanup, syntax checks, MX lookup, and disposable-domain signals. Returns stable source and interpretation fields for up to 100 addresses per request. The serverless route does not perform SMTP checks: valid means syntax valid, MX present, and domain not flagged disposable—not mailbox ownership, live reachability, delivery, consent, or anti-spam compliance. Deterministic test: emails=test@example.com,ava@example.org&maxResults=2. MCP tool: validate_email_addresses.
CourtListener Legal Opinions & Case Law API · $0.01 · settlement-verified · On-chain receipt
Search CourtListener legal opinions and case law by full text, court, filing date, citation, docket number, or source-reported status for precedent research, litigation analysis, and legal research workflows. Deterministic test: query=artificial intelligence copyright&maxResults=1 returns source-linked National Security Counselors v. Central Intelligence Agency evidence. CourtListener is a non-governmental public archive; results can be incomplete, delayed, duplicated, or corrected and are not official court copies, legal advice, identity verification, Shepardization/KeyCite treatment, or proof an opinion remains controlling law.
Email Verification API · $0.001 · settlement-verified · On-chain receipt
4 endpoints for real-time email verification: single verify, bulk verify (up to 100), domain check, MX lookup. Each call runs syntax validation, MX resolution, SMTP RCPT probe, catch-all detection, disposable check against 3500+ domains, role-based pattern detection (45+ patterns), free provider classification, typo suggestion, and a 0–100 quality score. Verdict: valid / invalid / risky / unknown.
Phone Validation & Geocoding API · $0.01 · settlement-verified · On-chain receipt
Bulk phone validation and carrier/region metadata for lead-list cleanup and CRM QA. Numbering-plan evidence only—not ownership, consent, live reachability, OTP delivery, or current HLR assignment.
Federal Court Dockets & PACER RECAP API · $0.01 · settlement-verified · On-chain receipt
Search federal court dockets through CourtListener's public RECAP archive by case name, court, filing dates, nature of suit, or full-text query. Returns bounded source-linked docket evidence with parties, attorneys, firms, judge, PACER case ID, CourtListener links, and matching archived documents. Deterministic test: caseName=Microsoft Corporation&maxResults=1. RECAP is an incomplete crowd-sourced PACER-derived archive—not official or complete PACER, identity verification, proof of allegations or liability, current case status/outcome, legal advice, or a Shepard's/KeyCite substitute.
OFAC SDN Sanctions Screening API · $0.01 · settlement-verified · On-chain receipt
Screen names against the U.S. Treasury OFAC Specially Designated Nationals (SDN) List by query, country, sanctions program, or person/entity type for AML, KYC, vendor, and counterparty review workflows. Deterministic test: query=Wagner Group&maxResults=1 returns one source-linked possible match. Scope is the SDN List only. Substring results are possible matches—not identity verification, legal or compliance clearance, non-SDN consolidated-list coverage, beneficial-ownership analysis under OFAC's 50 Percent Rule, or a substitute for current official guidance and qualified review.
AgentKit x402: email, domain and Swedish data APIs · $0.001 to $0.02 · settlement-verified · On-chain receipt
Pay-per-call utility API for agents (USDC on Base, x402 v2). 10 GET endpoints: email syntax/MX/disposable check ($0.002), SPF/DKIM/DMARC email-auth audit ($0.01), DNS-over-HTTPS records ($0.005), public contact details from a website ($0.02), one-page technical SEO audit ($0.02), URL to Markdown ($0.005), Swedish orgnr/personnummer/bankgiro/plusgiro validation ($0.001), IBAN validation ($0.001), Swedish clearing+account to IBAN ($0.002), Swedish bank-day calculator ($0.001). Honours robots.txt, no stored personal data, failed calls are not settled. OpenAPI at /openapi.json, MCP at /mcp, free static demos at /v1/demo/.
Base Wallet Profile · $0.01 · settlement-verified · On-chain receipt
Base wallet activity profiles for AI agents: native balance and contract status, indexed transaction and token-transfer history, and first/last-seen timestamps when available. Includes a transparent heuristic activity score and risk flags; incomplete history is marked, not presented as identity verification or investment advice.
Email-Verify Deliverability, MX & Disposable Trap Detector · $0.001 to $0.025 · settlement-verified · On-chain receipt
Real-time email deliverability, MX record, catch-all, and disposable domain verification API.
Exo Trust Synergy x402 utility layer · $0.002 · settlement-verified · On-chain receipt
OFAC SDN name screen. POST /execute/check_sanctions takes a name and returns literal matches from the OFAC Specially Designated Nationals list with program tags and provenance. $0.002 USDC per call on Base, no API key. The badge covers this route only; other routes advertised on this host are unpaid and unverified. Alias text embedded in SDN remarks is not separately indexed, so pass an alias as the name to screen it. Informational screening only: not identity verification, not a compliance sign off, and not legal advice.
GadgetHumans API Hub · $0.001 to $100 · settlement-verified · On-chain receipt
122 pay-per-call x402 endpoints on Base (USDC), no API key, no account. Flagship: /token-verdict returns a scored 0-100 risk verdict for any Base token (honeypot simulation, buy/sell tax, owner and mint privileges, verified source, liquidity, holders, 24h volume, named red flags) - $0.01. Also: DNS and email verification, domain and SSL checks, JSON/YAML/CSV conversion and validation, hashing and encoding, UUID/lorem/password generation, unit and currency conversion, and LLM text endpoints. From $0.001 per call. MCP endpoint exposes all 49 tools with prices.
ipv4.fr email authentication check · $0.003 · settlement-verified · On-chain receipt
SPF, DMARC policy and common DKIM selectors of a domain, with findings and a verdict. Maintained by ipv4.fr.

Unclaimed (bazaar) imports

These rows were imported and the provider has not claimed them. They are not the examples above.

Check an email address: RFC syntax, live MX records via DNS-over-HTTPS, and… · $0.003 · settlement-verified · Unclaimed (bazaar)
Check an email address: RFC syntax, live MX records via DNS-over-HTTPS, and disposable-domain screening. Check an email address: RFC syntax, live MX records via DNS-over-HTTPS, and disposable-domain screening. POST { email } or { emails: [...] } (max 20).
Email authentication posture check: parses SPF, DMARC and DKIM plus MX for any… · $0.01 · settlement-verified · Unclaimed (bazaar)
Email authentication posture check: parses SPF, DMARC and DKIM plus MX for any domain and grades deliverability/anti-spoofing gaps (SPF +all, SPF >10 lookups, DMARC p=none, missing DKIM). Email authentication posture check: parses SPF, DMARC and DKIM plus MX for any domain and grades deliverability/anti-spoofing gaps (SPF +all, SPF >10 lookups, DMARC p=none, missing DKIM). Clean JSON for deliverability and security-ops automation.
Email deliverability & domain security check — validates SPF, DKIM… · $0.002 · settlement-verified · Unclaimed (bazaar)
Email deliverability & domain security check — validates SPF, DKIM (multi-selector), and DMARC, detects spoofing and misconfigurations, and returns an A–F email security grade with transparent deductions. Email deliverability & domain security check — validates SPF, DKIM (multi-selector), and DMARC, detects spoofing and misconfigurations, and returns an A–F email security grade with transparent deductions. Anti-spam / anti-phishing readiness for any sending domain.
Says whether cold outreach - cold email, phone, SMS or postal mail - is… · $0.05 · settlement-verified · Unclaimed (bazaar)
Says whether cold outreach - cold email, phone, SMS or postal mail - is allowed, conditional or prohibited in a given country, with the legal basis (GDPR, PECR, CAN-SPAM, CASL, Spam Act, POPIA and national equivalents) and the conditions that must hold. Says whether cold outreach - cold email, phone, SMS or postal mail - is allowed, conditional or prohibited in a given country, with the legal basis (GDPR, PECR, CAN-SPAM, CASL, Spam Act, POPIA and national equivalents) and the conditions that must hold. Covers DE, AT, CH, GB, US, CA, AU, NZ, ZA. A country that is not covered is refused before the paywall. A risk map with citations, not legal advice.
Takes one email address and tells you whether it can actually receive mail · $0.01 · settlement-verified · Unclaimed (bazaar)
Takes one email address and tells you whether it can actually receive mail. Returns a verdict of valid, invalid, or risky, splits the address into username and domain, and flags free providers and role accounts like admin@ or support@. One address per call.
Validate email addresses: RFC-style syntax checks, IDN domain normalization,… · $0.003 · settlement-verified · Unclaimed (bazaar)
Validate email addresses: RFC-style syntax checks, IDN domain normalization, live MX lookups with A/AAAA fallback (DNS-over-HTTPS), disposable-domain detection, role-address detection (info@, support@), free-provider flagging, and typo suggestions for popular providers (gmial. Validate email addresses: RFC-style syntax checks, IDN domain normalization, live MX lookups with A/AAAA fallback (DNS-over-HTTPS), disposable-domain detection, role-address detection (info@, support@), free-provider flagging, and typo suggestions for popular providers (gmial.com -> gmail.com). Single address or batches up to 50. POST a JSON body like: {"emails":["ada@example.com","bad@mailinator.com","typo@gmial.com"]}
Validate phone numbers: E · $0.01 · settlement-verified · Unclaimed (bazaar)
Validate phone numbers: E.164 format, country detection, line type (mobile/landline/VOIP/toll-free), and risk score. Deterministic, sub-second. x402-native.
Validates email deliverability: syntax check, MX record lookup, and SMTP server… · $0.005 · settlement-verified · Unclaimed (bazaar)
Validates email deliverability: syntax check, MX record lookup, and SMTP server reachability. Validates email deliverability: syntax check, MX record lookup, and SMTP server reachability. Returns risk score and quality rating. Deterministic, sub-second. x402-native.

Questions

Which verification APIs are on this page?

Those in Verification, Data, Tools or Intelligence whose name says email, phone, identity or KYC, or whose text says email verification, email validation, phone validation, phone verification, identity verification or disposable email.

How does the agent pay for an email or phone check?

It calls the provider, receives HTTP 402, and pays in USDC on Base, Solana or Algorand over x402. There is no API key. The PayAPI Market catalogue does not charge for the lookup.

What does the receipt prove?

That PayAPI Market paid that route and recorded the on-chain USDC transfer. Settlement-verified means a paid route with an on-chain receipt. It does not verify every other route on the listing.