# 411data.io Lead Enrichment Session

> 411data.io Lead Enrichment Session is a paid API for AI agents from 411data.io, paid per call via x402, $1.5/call, status down (last checked 2026-09-15).

Runs an agentic lead enrichment session combining directory phone/people lookup, web research fallback, and company data pass to return a summary and structured enrichment JSON for a lead.

## Facts

- Endpoint: POST https://411data.io/api/v1/enrich/lead-session
- Price: $1.5/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/411data-io-lead-enrichment-session-bfc57e06
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5Wd9qSYcCW6GRAeBjjoxL

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability 411data-io-lead-enrichment-session-bfc57e06 -d '<json body>'
```

Example prompt: Can you enrich this lead for me — her name is Sarah Chen, she works at Meridian Health in Austin, TX, and I need her phone number, email, and a company overview so I can reach out?

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-source lead enrichment that combines directory lookup, reverse phone, and web research in a single agentic session. It is especially well-suited when you want both a human-readable markdown summary and structured JSON backfill in one call, and when you can tolerate variable pricing tied to actual data found. Prefer it over single-purpose sibling endpoints when the lead's contact details are sparse and multiple enrichment strategies may be needed.

## Known failure modes

- No enrichment fields found — bill-on-match policy applies, minimal or no charge
- Insufficient identifying information provided — session cannot locate the individual
- Rate limiting or quota exceeded — returns error indicating retry needed
- LLM synthesis failure during web research fallback — partial results returned
- Ambiguous identity match — multiple candidates found with low confidence

## How this service works

Agentic lead enrichment session: directory phone/people hunt, research_web fallback, company pass. Returns summary_markdown + lead_enrichment_v1 backfill JSON. Minimum base price pre-charged; usage true-up when session COGS (tools + synthesis LLM) exceeds base. Bill-on-match when no usable enrichment fields are found.

## Output

Returns a summary_markdown field with a human-readable enrichment summary and a lead_enrichment_v1 JSON object containing backfilled fields such as phone numbers (including mobile), email addresses, physical addresses, and company profile data. Billing is usage-based: a minimum base price is pre-charged and trued up if session compute costs exceed it; if no usable enrichment fields are found, the bill-on-match policy applies.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/411data-io-lead-enrichment-session-bfc57e06/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 411data.io](https://www.zero.xyz/host/411data.io/llms.txt)