Congress.gov API
The official REST API for the United States Congress, provided by the Library of Congress. It offers public access to machine-readable legislative data including bills, amendments, laws, committee reports, the Congressional Record, nominations, treaties, CRS reports, house votes, hearings, and member information. The API is free to use and requires a key obtained via the Data.gov signup page. Responses are available in JSON or XML format, with version 3 (v3) as the current release.
Congress.gov API publishes 20 APIs on the APIs.io network, including amendments API, bill API, bound-congressional-record API, and 17 more. Tagged areas include Government, Legislative, Congress, Bills, and Amendments.
The Congress.gov API catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.
Congress.gov API’s developer surface includes authentication, documentation, engineering blog, pricing, signup flow, changelog, and 8 more developer resources.
Kin Score
APIs 20
Individual APIs this provider publishes, each with its own machine-readable definition.
Congress.gov API amendments API
Returns amendment data from the API
Congress.gov API bill API
Returns bill data from the API
Congress.gov API bound-congressional-record API
Returns bound Congressional Record data from the API
Congress.gov API committee API
Returns committee data from the API
Congress.gov API committee-meeting API
Returns committee meeting data from the API
Congress.gov API committee-print API
Returns committee print data from the API
Congress.gov API committee-report API
Returns committee report data from the API
Congress.gov API congress API
Returns congress and congressional sessions data from the API
Congress.gov API congressional-record API
Returns Congressional Record data from the API
Congress.gov API crsreport API
Returns Congressional Research Service (CRS) report data from the API
Congress.gov API daily-congressional-record API
Returns daily Congressional Record data from the API
Congress.gov API hearing API
Returns hearing data from the API
Congress.gov API house-communication API
Returns House communication data from the API
Congress.gov API house-requirement API
Returns House requirement data from the API
Congress.gov API house-vote API
[BETA] Returns House of Representatives roll call vote data from the API
Congress.gov API member API
Returns member data from the API
Congress.gov API nomination API
Returns nomination data from the API
Congress.gov API senate-communication API
Returns Senate communication data from the API
Congress.gov API summaries API
Returns summaries data from the API
Congress.gov API treaty API
Returns treaty data from the API
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Pricing Plans 1
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Congress Gov Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals for API financial operations.
Congress Gov Finops
FINOPSSemantic Vocabularies 1
JSON-LD contexts and semantic vocabularies used across these APIs.
Congress Gov Context
JSON-LDSpectral Rules 1
Spectral governance rulesets for linting and validating these APIs.
Congress.gov API API Rules
SPECTRALJSON Schema 135
Standalone JSON Schema definitions for this provider's data models.
Actions
JSON SCHEMAActivity
JSON SCHEMAamendedBill
JSON SCHEMAAmendment
JSON SCHEMAAmendmentActions
JSON SCHEMAAmendmentAmendments
JSON SCHEMAAmendmentCosponsors
JSON SCHEMAAmendmentNumber
JSON SCHEMAAmendments
JSON SCHEMAAmendmentText
JSON SCHEMAarticle
JSON SCHEMAassociatedBill
JSON SCHEMAassociatedMeeting
JSON SCHEMAauthor
JSON SCHEMABill
JSON SCHEMABillDetail
JSON SCHEMABillSummaries
JSON SCHEMAbillSummariesArray
JSON SCHEMABoundCongressionalRecord
JSON SCHEMAcboCost
JSON SCHEMACommittee
JSON SCHEMAcommitteeBill
JSON SCHEMACommitteeBills
JSON SCHEMACommitteeCommunication
JSON SCHEMACommitteeDetail
JSON SCHEMAcommitteeHistory
JSON SCHEMACommitteeHouseCommunication
JSON SCHEMACommitteeMeeting
JSON SCHEMACommitteeMeetingDetail
JSON SCHEMAcommitteeMeetings
JSON SCHEMACommitteeNominations
JSON SCHEMACommitteePrint
JSON SCHEMAcommitteePrintCommittees
JSON SCHEMACommitteePrintDetail
JSON SCHEMACommitteePrintDetailText
JSON SCHEMAcommitteePrints
JSON SCHEMAcommitteePrintText
JSON SCHEMAcommitteeReport
JSON SCHEMACommitteeReports
JSON SCHEMAcommitteereportsformats
JSON SCHEMACommitteeReportsNumber
JSON SCHEMACommitteeReportsText
JSON SCHEMACommittees
JSON SCHEMACommitteeSenateCommunication
JSON SCHEMAcommunicationType
JSON SCHEMACongress
JSON SCHEMACongresses
JSON SCHEMACongressionalRecord
JSON SCHEMACoSponsor
JSON SCHEMACrsReport
JSON SCHEMACrsReportDetail
JSON SCHEMADailyCongressionalRecord
JSON SCHEMADailyCongressionalRecordArticles
JSON SCHEMADailyCongressionalRecordIssue
JSON SCHEMAformat
JSON SCHEMAformats
JSON SCHEMAfullIssue
JSON SCHEMAhearing
JSON SCHEMAHearingDetail
JSON SCHEMAHearings
JSON SCHEMAhouseCommunication
JSON SCHEMAHouseCommunications
JSON SCHEMAHouseCommunicationTypeNumber
JSON SCHEMAHouseRequirement
JSON SCHEMAHouseRequirements
JSON SCHEMAHouseVote
JSON SCHEMAHouseVoteMembers
JSON SCHEMAHouseVoteNumber
JSON SCHEMAHouseVoteNumberBase
JSON SCHEMAhouseVoteResults
JSON SCHEMAissues
JSON SCHEMAlatestAction
JSON SCHEMAlatestNominationAction
JSON SCHEMALaw
JSON SCHEMALawNumber
JSON SCHEMAlaws
JSON SCHEMAleadership
JSON SCHEMAlegislativeSubjects
JSON SCHEMAmatchCommunication
JSON SCHEMAMatchCommunications
JSON SCHEMAmeetingdocument
JSON SCHEMAMember
JSON SCHEMAmemberDetailTerms
JSON SCHEMAMembers
JSON SCHEMAMemberSponsoredLegislation
JSON SCHEMAmemberTerms
JSON SCHEMANomination
JSON SCHEMANominationActions
JSON SCHEMAnominationCommittee
JSON SCHEMANominationCommittees
JSON SCHEMANominationHearing
JSON SCHEMANominationNominee
JSON SCHEMANominations
JSON SCHEMAnominationType
JSON SCHEMAnominee
JSON SCHEMAnomineeAction
JSON SCHEMAparentcommittee
JSON SCHEMAparty
JSON SCHEMApartyHistory
JSON SCHEMApolicyArea
JSON SCHEMArecordedVote
JSON SCHEMARelatedBills
JSON SCHEMArelatedItem
JSON SCHEMArelatedMaterial
JSON SCHEMArelationshipDetails
JSON SCHEMAsectionArticle
JSON SCHEMAsenatecommittee
JSON SCHEMAsenateCommunication
JSON SCHEMASenateCommunications
JSON SCHEMASenateCommunicationTypeNumber
JSON SCHEMASessions
JSON SCHEMAsourceSystem
JSON SCHEMASponsor
JSON SCHEMAsponsoredLegislation
JSON SCHEMAsubcommittees
JSON SCHEMASubjects
JSON SCHEMASummaries
JSON SCHEMAsummariesArray
JSON SCHEMAsummaryBill
JSON SCHEMAText
JSON SCHEMAtextVersion
JSON SCHEMAtextVersions
JSON SCHEMATitles
JSON SCHEMAtitlesArray
JSON SCHEMAtopic
JSON SCHEMATreaty
JSON SCHEMAtreatyAction
JSON SCHEMATreatyActions
JSON SCHEMAtreatyCommittee
JSON SCHEMATreatyCommittees
JSON SCHEMATreatyDetail
JSON SCHEMAvideo
JSON SCHEMAvoteParty
JSON SCHEMAwitness
JSON SCHEMAwitnessDocument
JSON SCHEMAScroll for all 135
Examples 8
Example request and response payloads for these APIs.
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Security Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Get Started 1
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 2
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API