adapt-io

Adapt — B2B contact + company data API (250M+ contacts, 12M+ companies, Prospect API v3).

About

Adapt is a B2B lead intelligence and sales acceleration platform. The Prospect API exposes search, enrichment, and contact-purchase operations against Adapt's verified contact and company database via JSON over HTTPS, with header-based authentication (email + apiKey) and a 250 requests-per-minute account-level rate limit.

APIs

• Adapt Prospect API (v3) — https://api.adapt.io/v3
  • POST /contact/search — Search Contacts
  • POST /company/search — Search Companies
  • POST /contact/enrich — Enrich Contact (by email, LinkedIn URL, or firstName + lastName + domain)
  • POST /contact/fetch — Purchase Contacts (max 50 ids per request)

Artifacts

Folder	Contents
openapi/	OpenAPI 3.0 spec for the Prospect API (adapt-prospect-api-openapi.yml).
capabilities/	Naftiko capabilities for contact search, company search, enrichment, and purchase.
json-schema/	JSON Schema for Contact and Company entities.
json-ld/	JSON-LD context mapping Adapt entities onto schema.org.
examples/	Request/response examples for contact search and enrichment.
vocabulary/	Adapt operational and capability vocabulary.
plans/	API Commons Plans 0.1 — Free / Starter / Basic / Custom tiers.
rate-limits/	API Commons Rate Limits 0.1 — 250 rpm account-level + credit quotas.
finops/	FOCUS-aligned FinOps definition for credit-based metering.

Pricing (self-serve)

Plan	Price	Email credits	Phone credits	Enrich credits	API access
Free	$0/mo	25	—	25	No
Starter	$49/mo	500	—	500	No
Basic	$99/mo	1,000	100	1,000	No
Custom	Contact sales	Negotiated	Negotiated	Negotiated	Yes

API access to the Prospect API is gated to the Custom plan. Annual billing carries a 20% discount across all tiers.

Authentication

Every request requires two headers:

email:  account-email@your-company.com
apiKey: <key from Adapt account settings>

Rate limits and credits

• 250 requests per minute per account (fixed window).
• 429 APP-429-001 on throttle, with x-ratelimit-retry-after indicating wait seconds.
• Credit pools: search, email, phone, enrich. Remaining balances are returned on each call via *-remaining-credits response headers.

Sources

• https://www.adapt.io
• https://www.adapt.io/api-docs/v3/
• https://www.adapt.io/platform/api
• https://www.adapt.io/pricing
• https://www.adapt.io/our-data

Maintainer

Kin Lane — kin@apievangelist.com