Lead enrichment APIs you can pay per call

What a lead enrichment API does

A lead enrichment API takes something you already know about a prospect, such as a work email, a company domain, a profile URL or a name and company, and returns more of the record: job title and seniority, company size and industry, a work address, a register status or a fit score. The input is the lead you already hold. The output fills the fields your routing, scoring or outreach step reads.

That definition separates enrichment from two neighboring jobs. Prospect discovery finds new people or companies that match criteria; it creates leads instead of completing one. Signal tracking watches for hiring, filings or job changes; it tells you when to act on an account. Both are useful in a sales workflow, and both are priced on this page as adjacent outputs so they cannot set the price of an enrichment row.

Verification and qualification belong with enrichment because they also start from a lead you hold. A verification route checks whether the company is registered and active or whether the email domain can receive mail. A qualification route scores the lead against an ideal customer profile. Each adds fields to an existing record, and each needs its evidence kept next to the verdict.

Personal data deserves care at every step. A person profile, a work email and a job title describe a real individual. Collect only the fields your process needs, keep the source and date of each one, honor deletion requests and check the rules that apply to outreach in the recipient's country before an agent sends anything.

Compare the returned data, sources and limits

The comparison separates five outputs that can qualify a service: company profiles, person profiles, work-email lookups, lead verification and prospect qualification. Discovery searches and hiring, intent or filing signals are listed separately as adjacent products. A service enters the table only with a priced route of one of the first five outputs, and its row price is the lowest of those routes.

Company profiles vary more than their names suggest. A profile built from a public website and DNS records reports what the domain publishes; a merged firmographic profile adds headcount, revenue or funding from commercial databases. Both are company enrichment, with different evidence and freshness. Read the field list and the declared source before comparing their prices.

Public web, registry or DNS evidence is declared by agentstools, AgentBIT, DOHMAN Machine Services, Zinin M2M Hub and M0 Email Verification in the matched endpoint descriptions. People Data Labs is named as a source by Deepline GTM API and MDataAccess. A declared source describes where a provider says the data comes from; it does not certify that a specific field is current. Store the provider, route and observation date with every enriched value.

Dutch or Belgian company register checks are described by Limitguard. A register check confirms registration status in that jurisdiction; a lead outside those registers needs another source.

Each price is the cheapest endpoint of that service for that kind of data: the same number wherever this page quotes it.

Compare 15 lead enrichment services

Each row keeps the selected endpoint and its reference price. Rows are ordered by observed paying wallets for the service; the order does not rank match rate, field coverage or data freshness.

$/CALL is the price of the endpoint named under it: the cheapest company profile enrichment from a name or domain, professional person profile enrichment, work-email lookup for a known person, lead verification before outreach and prospect qualification and fit scoring endpoint of the service or, for a service without one, its cheapest lead enrichment endpoint. Never the cheapest tool of a gateway. Other kinds of data have their own price in the tables below. LEAD ENRICHMENT ENDPOINTS counts the lead enrichment endpoints out of all the endpoints the service lists. BUYERS 30D counts distinct wallets that paid the whole service on-chain in 30 days, not only its lead enrichment endpoints. "Generalist" marks a gateway that sells more than three unrelated kinds of tools: it is never called the cheapest.

How to choose a lead enrichment endpoint

Start from the input you hold

An email address, a company domain, a profile URL and a name with a company lead to different routes and different match rates. Group your records by the identifier they carry and test each group separately. A route that needs a profile URL is not a fallback for a list of bare email addresses.

Define a match before paying for it

Decide which fields make a result usable: a title and seniority for routing, a work email for outreach, a headcount band for scoring. A response with a name and nothing else may count as a match for the provider and still be useless for your workflow. Write the acceptance rule first, then compare providers on accepted records.

Check what happens on a miss

A route can charge for every request, whether or not it finds the person, or charge only for a deliverable result. Read the terms for the exact route. The difference changes the cost of enriching a list with a low expected match rate far more than the per-call quote does.

Verify before you enrich

A cheap syntax, domain or register check can stop a malformed email, a role address or an inactive company before a more expensive person lookup. Order the calls so the cheap filters run first, and keep their verdicts with the record so the reason for a skipped lead stays visible.

Keep provenance and freshness

People change jobs and companies change size. Store the provider, route, input and observation date with each enriched field, and set a refresh interval for the fields that drive decisions. A stale title routed to the wrong team costs more than a fresh lookup.

Test the operating limits

The monitored median uptime is 100% and the median selected quote is $0.05. Monitoring latency describes our checks, not the time an asynchronous lookup takes to finish. Test known contacts, a former employee, a company with a common name and a record with a personal email before committing to a provider.

Choose by the output your workflow needs

Start with the field your next step consumes. The candidates below use the same classification as the comparison table, and each job quote is the lowest priced endpoint of the requested types, with its path kept.

Enrich a company from a name or domain

Company profiles range from public website and DNS evidence to merged firmographics with headcount, revenue and funding. Decide which fields your routing or scoring rule reads, and keep the source of each one.

Candidates today, most buyers first: agentstools ($0.015/call, generalist, 127 buyers) · AgentBIT ($0.1/call, generalist, 71 buyers) · Deepline GTM API ($0.1/call, 43 buyers) · Apollo via Locus ($0.038/call, 36 buyers) · Linked Panda ($0.05/call, 34 buyers) · Qonoro Intelligence API ($0.05/call, generalist, 14 buyers) · DOHMAN Machine Services ($0.003/call, 4 buyers) · Zinin M2M Hub ($0.01/call, generalist, 3 buyers) · MDataAccess ($0.15/call, 1 buyer) · PayForAPI resale doors — people enrichment + web search ($0.15/call, generalist)

Enrich a person from an email, profile URL or name

A person profile describes a professional role at a point in time. Store the observation date and the input you matched on, and treat a missing title as unknown rather than as a change of job.

Candidates today, most buyers first: vaaya ($0.01/call, generalist, 57 buyers) · Deepline GTM API ($0.12/call, 43 buyers) · Apollo via Locus ($0.038/call, 36 buyers) · Linked Panda ($0.05/call, 34 buyers) · Qonoro Intelligence API ($0.05/call, generalist, 14 buyers) · MDataAccess ($0.35/call, 1 buyer) · PayForAPI resale doors — people enrichment + web search ($0.1/call, generalist)

Find a work email for a known person

A work-email lookup returns a candidate address for a named person. Check how the provider defines a deliverable result and whether a miss is charged before running it across a list.

Candidates today, most buyers first: Linked Panda ($0.05/call, 34 buyers) · PayForAPI resale doors — people enrichment + web search ($0.05/call, generalist) · Deploid Enrich ($0.15/call)

Verify a lead before outreach

Lead verification checks what a record already holds: register status, tax number, mail domain or role-account signals. A clean result lowers the chance of wasted outreach; it does not confirm that a person wants to hear from you.

Candidates today, most buyers first: Limitguard ($0.1/call, generalist, 5 buyers) · M0 Email Verification ($0.015/call)

Score a prospect against your ideal customer profile

Fit scores are rules or model judgments about public evidence. Keep the evidence and the rule version with the score, and review a sample by hand before letting a score route leads automatically.

Candidates today, most buyers first: Qonoro Intelligence API ($0.6/call, generalist, 14 buyers) · Signal Forge x402 Services ($0.01/call, 6 buyers)

Find new prospects

Discovery returns new records instead of enriching one you hold. Check the unit: a single result per paid call and a page of results cost differently per usable prospect.

Candidates today, most buyers first: vaaya ($0.01/call, generalist, 57 buyers) · Apollo via Locus ($0.005/call, 36 buyers) · Linked Panda ($0.3/call, 34 buyers) · Qonoro Intelligence API ($0.05/call, generalist, 14 buyers) · MDataAccess ($0.15/call, 1 buyer) · PayForAPI resale doors — people enrichment + web search ($0.15/call, generalist)

Track hiring, intent and job-change signals

Signals are timing hints. A job posting, a filing or a detected role change says something happened; the inference that a company is ready to buy remains yours to test.

Candidates today, most buyers first: Linked Panda ($0.05/call, 34 buyers) · Qonoro Intelligence API ($0.05/call, generalist, 14 buyers) · Zinin M2M Hub ($0.01/call, generalist, 3 buyers)

What the providers describe

These paragraphs attribute output contracts, sources and limits to each provider. Reference prices follow the matching endpoint type, never an amount quoted in a marketing description.

Linked Panda

Linked Panda describes a read-only API over LinkedIn data. Company enrichment starts at $0.05, profile enrichment for one B2B lead at $0.05 and a verified work-email lookup for a profile at $0.05. Company and profile searches return results pages at $0.3, a different unit from enriching one record. The endpoint descriptions are short, so read the response schema for field coverage and freshness before mapping it into a CRM.

7 lead enrichment endpoints of 10 · $0.05/call (POST /agent/v1/companies/enrich) · Base · uptime 30d 100% · 152 ms · 34 buyers in 30 days

Deepline GTM API

Deepline lists POST /api/company/enrich at $0.1. The provider describes a merged profile of more than 30 fields from Apollo, Crustdata and People Data Labs, covering revenue, headcount, industry, funding, technology and address fields. POST /api/person/from-email, at $0.12, reverses an email address into a name, title, company and profile URL. A merged profile can disagree with each of its upstreams; keep the provider's field values and dates instead of assuming a single original source.

2 lead enrichment endpoints of 2 · $0.1/call (POST /api/company/enrich) · Base · uptime 30d 100% · 494 ms · 43 buyers in 30 days

Apollo via Locus

Apollo via Locus is a reseller listing: Locus wraps Apollo people and organization routes and charges per call. Person enrichment and bulk person enrichment start at $0.038, organization enrichment at $0.038 and the search routes at $0.005. The endpoint descriptions name the Locus wrapper without documenting fields, so the Apollo response format and the reseller's handling of partial matches should be confirmed with a known contact.

5 lead enrichment endpoints of 5 · $0.038/call (POST /apollo/org-enrichment) · Base · uptime 30d 99.9% · 300 ms · 36 buyers in 30 days

MDataAccess

MDataAccess separates enrichment from discovery. /company enriches a company from a name or website at $0.15 and /person enriches a person from an email, profile URL or name at $0.35. Its discovery routes start at $0.15: the search routes return exactly one company or profile per paid call, and the decision-maker and lead routes return one senior contact or one sales-ready lead for a company and business function. Budget discovery by accepted record, since each paid call yields one candidate.

6 lead enrichment endpoints of 7 · $0.15/call (GET /company) · Base · uptime 30d 100% · 235 ms · 1 buyer in 30 days

PayForAPI resale doors — people enrichment + web search

PayForAPI lists a work-email finder at $0.05, taking a full name and company domain. People enrichment by profile URL, email or name and domain starts at $0.1, and company enrichment by domain, name, profile URL or ticker at $0.15. A people-search route at $0.15 finds new people by title, company and other filters, which is prospecting rather than enrichment.

4 lead enrichment endpoints of 6 · $0.05/call (GET /email-enrich) · Base · uptime 30d 99.7% · 307 ms · 0 buyers in 30 days

Qonoro Intelligence API

Qonoro covers several steps of an outbound workflow. Company identity enrichment starts at $0.05 and person enrichment from a name and company at $0.05; the provider says the person route returns title, seniority, department, decision-maker status, profile URL and location. Lead qualification with fit scoring, cited evidence, risks and a suggested next action starts at $0.6, and hiring, intent, job-change and news routes start at $0.05. Each output answers a different question, so price the sequence your workflow runs.

10 lead enrichment endpoints of 21 · $0.05/call (POST /v1/company/enrich) · Base · uptime 30d 100% · 257 ms · 14 buyers in 30 days

Deploid Enrich

Deploid Enrich lists one route, POST /v1/work-email, at $0.15. It looks up one work email from a profile or a name and company as an asynchronous job with free polling. The provider says it charges only for a deliverable result, does not return personal emails or phones and describes the service as a limited pilot for occasional CRM enrichment rather than bulk prospecting. Plan for job polling and an uncharged miss in your retry logic.

1 lead enrichment endpoint of 1 · $0.15/call (POST /v1/work-email) · Base · uptime 30d 100% · 889 ms · 0 buyers in 30 days

Limitguard

Limitguard lists POST /v1/leads/verify at $0.1 for one Dutch or Belgian sales lead. The provider says it checks the company in the KVK or KBO register and cross-checks what the lead holds: VAT number, mail server and disposable domain, bank country and name screening against sanctions lists, returning a verdict, a lead score and flags with an action each. Inputs that are not supplied are not checked. Its service description quotes a lead-verify amount that differs from the captured endpoint; this page uses the captured endpoint quote.

1 lead enrichment endpoint of 11 · $0.1/call (POST /v1/leads/verify) · Base/SOL · uptime 30d 99.8% · 177 ms · 5 buyers in 30 days

Signal Forge x402 Services

Signal Forge's qualification routes start at $0.01. POST /x402/prospect-qualifier scores a public business URL for fit against an ideal customer profile, contactability, website trust friction and opportunity signals, returning evidence and a qualify, review or skip decision. A batch route qualifies a small set of URLs per request. The provider describes the batch scores as heuristic rather than calibrated win probabilities, a caveat worth keeping wherever the score drives routing.

2 lead enrichment endpoints of 11 · $0.01/call (POST /x402/prospect-qualifier) · Base · uptime 30d 100% · 232 ms · 6 buyers in 30 days

M0 Email Verification

M0 lists POST /v1/lead-validate at $0.015 as a pre-flight check before paying for contact enrichment: email syntax, live DNS, MX records, disposable-domain and role-account detection, built from public DNS and conventions. The provider states that it does not confirm mailbox existence or person identity. Used first, it can stop a malformed or role address before a more expensive person lookup.

1 lead enrichment endpoint of 3 · $0.015/call (POST /v1/lead-validate) · Base · uptime 30d 94.2% · 434 ms · 0 buyers in 30 days

Cost per lead and for a larger list

The median selected route costs $0.05 per call. At the same request shape, 100,000 calls total $5,000.00. The table repeats the calculation for the services named on this page. Treat it as a reference figure: the cost of an enriched lead depends on how many calls produce one accepted record.

Each service at the price of its main lead enrichment endpoint, the one named in the table above.

A realistic budget multiplies by more than the list size. Count the verification calls that run first, the enrichment calls that follow, the misses that are charged and the refreshes you will need. A route that costs more per call but charges only for a deliverable result can be cheaper per accepted email on a list with a low match rate.

Deduplicate records before enriching them and cache company profiles, which many leads share. Read the payment challenge for the exact request before authorizing a payment, and record whether an empty or partial answer was charged under the provider's terms.

Inspect a request and its payment evidence

The public listing documents Linked Panda at GET /agent/v1/profiles/enrich, described as profile enrichment for one B2B lead. This endpoint has a reference quote of $0.05. The listing does not name the query parameter that carries the profile, so read the request schema before building the call.

The listed method and description establish the advertised contract. This explanation does not reproduce an HTTP 402 challenge or certify a paid response. Open the linked service's payment evidence and request the challenge for the exact call before authorizing a payment. Keep the resource, method, input, accepted payment and response together, then compare the returned fields with a contact whose details you already know.

How this comparison is built

The comparison starts with services that are online and payment-ready, have a known price, a description of at least 80 characters and measured 30-day uptime of at least 90%. Task selection then reads the documented endpoints. A service enters the table only with a priced company, person, work-email, lead-verification or qualification route; discovery and signal routes are shown as adjacent outputs. General-purpose email and phone validators, outbound message writing, account actions and token or wallet enrichment are different products and stay out; a validation bundle documented as a check before contact enrichment counts as lead verification. Pages below the index threshold can still be read directly.

Provider claims were reviewed against the public service and endpoint descriptions captured on October 22, 2026, and remain provider claims. Monitoring supplies operating figures and reference prices; it does not test match rates, field accuracy or how current a profile is. Buyer counts describe observed paying wallets for the service, with the coverage limits explained on its linked page.

The visible comparison date is October 26, 2026. Endpoint membership, row prices, the type table and the job candidates share one classification, so a cheaper search or signal route cannot replace the quote of an enrichment output.

Questions

How to pay

Each service answers an unpaid call with HTTP 402 and its price; your agent signs a USDC payment on the listed network and retries. No API key, no account, no subscription. See what x402 is.