Chronicling America
Chronicling America is a Library of Congress initiative providing free public access to a searchable database of historic American newspaper pages from 1770 to 1963. The platform hosts over 20 million digitized newspaper pages from hundreds of US newspapers contributed by institutions in the National Digital Newspaper Program (NDNP). The API exposes search, title, issue, batch, and OCR text endpoints with no authentication required, returning responses in JSON and Atom feed formats.
Chronicling America publishes 6 API contracts indexed on the APIs.io network, including Batches API, Issues API, OCR API, and 3 more. Tagged areas include Newspapers, Historical, Archives, Library of Congress, and Government.
The Chronicling America catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.
Chronicling America’s developer surface includes documentation and 14 more developer resources.
Kin Score
Markets this provider is in provisional
The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.
| Market | Position | Depth | Registered MCP server | Declares compatibility |
|---|---|---|---|---|
| IIIF and Cultural Heritage (GLAM image interoperability, Linked Art) | undeclared | - | - | - |
Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.
Standards implemented 1
Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.
APIs 6
Individual APIs this provider publishes, each with its own machine-readable definition.
Chronicling America Batches API
Endpoints for retrieving digitization batch information.
Chronicling America Issues API
Endpoints for retrieving newspaper issue metadata.
Chronicling America OCR API
Endpoints for retrieving OCR text from digitized newspaper pages.
Chronicling America Pages API
Endpoints for retrieving individual newspaper page metadata and content.
Chronicling America Search API
Full-text search endpoints for newspaper pages and titles.
Chronicling America Titles API
Endpoints for retrieving newspaper title bibliographic metadata.
Open Collections 6
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Chronicling America Batches API
OPEN COLLECTIONChronicling America Batches Issues API
OPEN COLLECTIONChronicling America Batches OCR API
OPEN COLLECTIONChronicling America Batches Pages API
OPEN COLLECTIONChronicling America Batches Search API
OPEN COLLECTIONChronicling America Batches Titles API
OPEN COLLECTIONChronicling America API pricing
Not yet checked against Chronicling America's own pricing page. Compiled by API Evangelist on 2026-06-13; confirm before you rely on a figure. A free plan or tier is listed.
| Plan | Price |
|---|---|
| Free Public Access free | Free |
Plan details, limits and sources →
Rate limits
- Search and Metadata Endpoints: 150 requests per minute
- Page and OCR Text Endpoints: 150 requests per minute
- Image and Binary File Downloads: 60 requests per minute
Compiled by API Evangelist, not yet checked against Chronicling America's documentation. Rate-limit details →
Pricing Plans 1
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Chroniclingamerica Rate Limits
RATE LIMITSService Levels 1
Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.
FinOps 1
Cost, billing, and metering signals for API financial operations.
Semantic Vocabularies 1
JSON-LD contexts and semantic vocabularies used across these APIs.
Chroniclingamerica Context
JSON-LDSpectral Rules 1
Spectral governance rulesets for linting and validating these APIs.
Chronicling America API Rules
SPECTRALSecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 1
Pagination, idempotency, versioning, errors, and events
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Other 1
Properties that don't map to a standard resource type
Source (apis.yml)
Chronicling America API — frequently asked questions
Does Chronicling America have an API?
Yes. APIs.io lists 6 APIs from Chronicling America, including Chronicling America Batches API, Chronicling America Issues API and Chronicling America OCR API, and 3 more.
Is there an OpenAPI specification for the Chronicling America API?
Yes. APIs.io indexes 6 OpenAPI specifications for Chronicling America, each linked for download from this page.
How much does the Chronicling America API cost?
APIs.io lists 1 pricing plan for Chronicling America, with each plan's price, limits and inclusions under Pricing on this page.
Is the Chronicling America API ready for AI agents?
Chronicling America has a Kin Score of 32.1 out of 100 (thin) and an Agent Readiness score of 28.4 (agent-aware), scored by API Evangelist on 2026-11-06.
Work with this as data
Every provider here is available over the APIs.io API and to AI agents over MCP.