---
$id: https://apis.ax/directory
$type: Directory
$context: https://schema.org
app: "apis.ax"
---

# apis.ax

The agent-first API catalog — every high-quality API an agent needs mid-task, agent-legible by construction, worst-case cost on the wire before the first call.

**4** of **42** listings (category=enrichment).

## Facets

_Derived from the Listing type — no facet was hand-authored._

### Category (enum)

- reference-data (8) — `/directory?category=reference-data`
- enrichment (4) — `/directory`
- web-access (3) — `/directory?category=web-access`
- intelligence (6) — `/directory?category=intelligence`
- compute (2) — `/directory?category=compute`
- geo (3) — `/directory?category=geo`
- finance (2) — `/directory?category=finance`
- commerce (2) — `/directory?category=commerce`
- business (3) — `/directory?category=business`
- compliance (4) — `/directory?category=compliance`
- logistics (3) — `/directory?category=logistics`
- platform (2) — `/directory?category=platform`

## Listings

### Email deliverability / domain reputation

- id: `email-deliverability-reputation`
- category: enrichment
- sources: DMARC/SPF/DKIM, blocklist, inbox-placement
- pricing: per domain check
- detail: https://apis.ax/listings/email-deliverability-reputation

Check DMARC/SPF/DKIM alignment, blocklist presence, and inbox placement BEFORE a send — so outreach never leaves from a burned domain.

### Data enrichment — multi-vendor waterfall

- id: `enrichment-external-waterfall`
- category: enrichment
- sources: Apollo, Hunter, PDL, Prospeo, FullEnrich
- pricing: per verified record across the cascade
- detail: https://apis.ax/listings/enrichment-external-waterfall

Apollo, Hunter, PDL, Prospeo, and FullEnrich orchestrated under one contract: the waterfall keeps trying vendors until a record verifies, and you pay only when one does.

### Data enrichment — company / person / email

- id: `enrichment-waterfall-house-core`
- category: enrichment
- sources: enrichment.headless.ly, wikidata
- pricing: per verified record · unverified results are never charged
- detail: https://apis.ax/listings/enrichment-waterfall-house-core

Domain or name → firmographics → decision-maker → verified email, in one waterfall call — you are charged only when the record verifies as deliverable, never for a miss.

### Phone & address validation (canonical /validate)

- id: `phone-address-validate`
- category: enrichment
- sources: live-telco lookup, places.org.ai address data
- pricing: per validation
- detail: https://apis.ax/listings/phone-address-validate

One canonical /validate/phone and /validate/address with published accuracy benchmarks — live-telco phone checks, address checks on the places.org.ai geographic base.

---

> Agent register. Submit a listing: `POST https://apis.ax/listings` with a JSON Listing body. The same state renders as HTML at `https://apis.ax/directory?format=html`.