# Fieldgeist Verify


- **Get started**
- [Introduction](/): Fieldgeist Verify is an address model, trained on real US addresses. It reads free text into USPS-standard fields and matches the address to a parcel.
- [Quickstart](/quickstart): Create an API key, parse an address and match it to a parcel.
- [Authentication](/authentication): Authenticate requests with a team API key sent as a Bearer token.

- **Concepts**
- [US-LEX-1](/concepts/model): The Verify model. A purpose-built neural model, trained by Fieldgeist on real US addresses.
- [Fieldgeist IDs](/concepts/fieldgeist-ids): fieldgeist_id identifies a parcel; building_id groups the unit parcels of one building.
- [Condos and units](/concepts/condos-and-units): How lookups handle buildings whose units are separate parcels, and what unit_required asks of you.
- [Confidence and warnings](/concepts/confidence-and-warnings): How sure an answer is, and how the API tells you what it couldn't settle.

- **Guides**
- [From free text to a parcel](/guides/parse-then-match): Parse an address, match it to a parcel, and handle every answer the lookup can give.

- **API reference**
- [API overview](/api-reference/overview): Base URL, request format, response headers and conventions shared by every Verify endpoint.
- [Parse an address](/api-reference/parse): Split one line of free text into USPS Publication 28 components and standardized delivery lines.
- [Look up a parcel](/api-reference/lookup): Match a parsed street address to its parcel, or learn why it can't be matched to exactly one.
- [Look up by Fieldgeist ID](/api-reference/lookup-by-id): Fetch one parcel and its address by the Fieldgeist ID a lookup returned.
- [Errors](/api-reference/errors): Every error code the Verify API returns, what causes it and what to do.

- **Account**
- [Rate limits and quotas](/rate-limits): The limits the Verify API enforces, and what happens when you reach each one.
- [Credits and billing](/billing): Prepaid credits, billed per answered request. What counts as billable, and how to control spend.
- [Changelog](/changelog): Changes to the Verify API, newest first.