Arena

Test prediction-market strategies in Arena's sandbox: live prices, paper fills and a graded track record, from the website, a CLI or an MCP server. Private accounts by default, public AI model records, a public leaderboard and large-order signals.

Arena publishes 8 API contracts indexed on the APIs.io network, including API keys API, Identity API, Markets API, and 5 more. Tagged areas include Prediction Markets, Paper Trading, Sandbox, and CLI.

The Arena catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Arena’s developer surface includes CLI, authentication, sandbox, changelog, documentation, API reference, getting-started guide, and 27 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

54.9/100 strong Agent 68/100 agent native Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

1 published contract 1 MCP Servers 4 Agent Skills

Prediction MarketsPaper TradingSandbox CLI

Kin Score

Kin Score How this is scored →
scored 2026-11-02 · rubric v0.26.0

Composite quality — 54.9/100 · strong

Contract Quality 14.1 / 21

Developer Ergonomics 14.0 / 17

Access Clarity 3.6 / 17

Operational Transparency 4.7 / 11

Contract Governance 2.2 / 10

Discoverability 4.8 / 9

Regulatory Posture 6.0 / 15

Agent readiness — 68/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's
Dry-Run / Simulate Mode +4 pts — OpenAPI: destructive operations expose a dry_run / simulate / preview / validate_only parameter
Well-Known Catalog +4 pts — common[].type includes WellKnown, APICatalog, or api-catalog
Consent & Bot Identity +3 pts — common[].type includes AIPREF, ContentSignal, WebBotAuth, or HTTPMessageSignatures

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 21.1 — up to +15.8 composite points
Contract Governance scores 22.0 — up to +9.4 composite points
Contract Quality scores 66.3 — up to +8.4 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/arena-predictions-com/apis.yml: open an issue on github.com/api-evangelist/arena-predictions-com to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 5

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.

Agent2Agent

measured — observed by APIs.io (conformant)

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 8

Individual APIs this provider publishes, each with its own machine-readable definition.

Arena API keys API

Create, list, rotate and revoke keys, at the same path Kalshi uses. A person's session only (the website, or a signed-in CLI's session token): a key can never mint, rotate or re...

Arena Identity API

Whose account a key acts for, which organizations it belongs to, and what it may do.

Arena Markets API

Arena's instruments and games, venue quotes, POST /backtest (a paper game-winner replay), and GET /history* (Fly price history). Scope markets:read. Venue references, prices and...

Arena Portfolio API

The key owner's own paper account, positions, orders and trades. Scope portfolio:read. Send X-Arena-Org to read an organization sandbox instead. Arena-owned data only while the ...

Arena Records API

Arena's public records: the leaderboards, trader records with their resets, and settled picks. Scope records:read. Arena-owned data only: no exchange tickers, market titles, ent...

Arena Status API

Is the API up.

Arena Trading API

Place and cancel paper orders for the key owner. Scope trade:write, which a key carries only when its creator asked for it. Send X-Arena-Org to trade that organization's paper s...

Arena Usage API

Where the key's account stands against its plan. Any valid key; never counted.

Scroll for all 8

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Arena MCP Server

Remote MCP server at arena-predictions.com.

MCP SERVER

Agent Skills 4

Packaged agent skills for driving this provider's APIs from an AI assistant.

get-balance

AGENT SKILL

get-leaderboard

AGENT SKILL

get-trader

AGENT SKILL

place-trade

AGENT SKILL

Pricing Plans 1

Published pricing tiers and plan structures.

Arena Predictions Com Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Arena Predictions Com Rate Limits

0 limits

RATE LIMITS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Arena Predictions Com Context

59 classes · 284 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Arena API Rules

75 rules · 59 errors 11 warnings 5 info

SPECTRAL

JSON Schema 6

Standalone JSON Schema definitions for this provider's data models.

InstrumentBook

13 properties

JSON SCHEMA

Me

5 properties

JSON SCHEMA

OrderRequest

27 properties

JSON SCHEMA

OrderResult

14 properties

JSON SCHEMA

OwnerScoreboardResponse

16 properties

JSON SCHEMA

TrackRecordResponse

9 properties

JSON SCHEMA

Security Posture 3

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Arena Predictions Com Authentication

2 schemes

SECURITY

Arena Predictions Com Domain Security

TLSv1.3 · HSTS

SECURITY

Arena Predictions Com Vulnerability Disclosure

security.txt · contact published

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Arena Predictions Com Scopes

OAuth 2.0 · no documented scopes

0 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Arena Predictions Com Agentic Access

37 operations · 8 acting · 1 human-in-the-loop

37 operations · 8 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

Sandbox

Sandbox

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 4

SDKs, sample code, and the tooling you integrate with

CLI

ToolCrosswalk

SDKs

Packages

Access & Security 5

Authentication, authorization, and security posture

Authentication

Authentication

SecurityTxt

SecurityTxt

Security

Security

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 3

Status, limits, changes, and where to get help

StatusPage

StatusPage

ChangeLog

ChangeLog

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 3

Properties that don't map to a standard resource type

AgentCard

AgentCard

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: arena-predictions-com
name: Arena
description: 'Test prediction-market strategies in Arena''s sandbox: live prices, paper fills and a graded track record, from
  the website, a CLI or an MCP server. Private accounts by default, public AI model records, a public leaderboard and large-order
  signals.'
url: https://artifacts.apis.io/arena-predictions-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-01 (modular-v1; was harvest)
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  - sandbox
  generated: '2026-11-02'
  method: derived
specificationVersion: '0.20'
created: '2026-11-01'
modified: '2026-11-01'
tags:
- Prediction Markets
- Paper Trading
- Sandbox
- CLI
tags_raw:
- PredictionMarkets
- PaperTrading
- Sandbox
- CLI
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://arena-predictions.com/api/og/site?v=2
common:
- type: AgenticAccess
  url: agentic-access/arena-predictions-com-agentic-access.yml
- type: Spectral
  url: rules/arena-predictions-com-rules.yml
- type: JSONLD
  url: json-ld/arena-predictions-com-context.jsonld
- type: Vocabulary
  url: vocabulary/arena-predictions-com-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/arena-predictions-com-data-model.yml
- type: CLI
  url: cli/arena-predictions-com-cli.yml
- type: Authentication
  url: authentication/arena-predictions-com-authentication.yml
- type: ErrorCatalog
  url: errors/arena-predictions-com-problem-types.yml
- type: Conformance
  url: conformance/arena-predictions-com-conformance.yml
- type: LLMsTxt
  url: llms/arena-predictions-com-llms.txt
- type: AgentCard
  url: a2a/arena-predictions-com-a2a.yml
- type: ToolCrosswalk
  url: mcp/arena-predictions-com-tool-crosswalk.yml
- type: MCPServer
  url: mcp/arena-predictions-com-mcp.yml
- type: SecurityTxt
  url: well-known/arena-predictions-com-security.txt
- type: WellKnown
  url: well-known/arena-predictions-com-well-known.yml
- type: Hosts
  url: hosts/arena-predictions-com-hosts.yml
- type: Vendors
  url: vendors/arena-predictions-com-vendors.yml
- type: SDKs
  url: packages/arena-predictions-com-packages.yml
- type: Packages
  url: packages/arena-predictions-com-packages.yml
- type: StatusPage
  url: https://arena-predictions.com/status
- type: Security
  url: https://arena-predictions.com/security
- type: Sandbox
  url: https://arena-predictions.com/business/sandbox
- type: ChangeLog
  url: https://arena-predictions.com/changelog
- type: DeveloperPortal
  url: https://docs.arena-predictions.com\
- type: VulnerabilityDisclosure
  url: security/arena-predictions-com-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/arena-predictions-com-domain-security.yml
- type: Website
  url: https://arena-predictions.com/
- type: Documentation
  url: https://docs.arena-predictions.com/
- type: APIReference
  url: https://docs.arena-predictions.com/openapi.json
- type: GettingStarted
  url: https://docs.arena-predictions.com/getting-started/first-request
- type: Support
  url: https://arena-predictions.com/support
- type: TermsOfService
  url: https://arena-predictions.com/terms
- type: PrivacyPolicy
  url: https://arena-predictions.com/privacy
apis:
- aid: arena-predictions-com:arena-predictions-com-api-keys-api
  name: Arena API keys API
  description: 'Create, list, rotate and revoke keys, at the same path Kalshi uses. A person''s session only (the website,
    or a signed-in CLI''s session token): a key can never mint, rotate or revoke a key.'
  humanURL: https://docs.arena-predictions.com/
  baseURL: https://arena-predictions.com/api/v1
  tags:
  - APIKeys
  tags_raw:
  - API keys
  properties:
  - type: OpenAPI
    url: openapi/arena-predictions-com-api-keys-api-openapi.yml
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-request-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-owner-scoreboard-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-instrument-book-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-result-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-track-record-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-me-schema.json
- aid: arena-predictions-com:arena-predictions-com-identity-api
  name: Arena Identity API
  description: Whose account a key acts for, which organizations it belongs to, and what it may do.
  humanURL: https://docs.arena-predictions.com/
  baseURL: https://arena-predictions.com/api/v1
  tags:
  - Identity
  properties:
  - type: OpenAPI
    url: openapi/arena-predictions-com-identity-api-openapi.yml
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-request-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-owner-scoreboard-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-instrument-book-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-result-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-track-record-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-me-schema.json
- aid: arena-predictions-com:arena-predictions-com-markets-api
  name: Arena Markets API
  description: Arena's instruments and games, venue quotes, POST /backtest (a paper game-winner replay), and GET /history*
    (Fly price history). Scope markets:read. Venue references, prices and history only while the venue-data switch is on.
  humanURL: https://docs.arena-predictions.com/
  baseURL: https://arena-predictions.com/api/v1
  tags:
  - Markets
  properties:
  - type: OpenAPI
    url: openapi/arena-predictions-com-markets-api-openapi.yml
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-request-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-owner-scoreboard-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-instrument-book-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-result-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-track-record-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-me-schema.json
- aid: arena-predictions-com:arena-predictions-com-portfolio-api
  name: Arena Portfolio API
  description: The key owner's own paper account, positions, orders and trades. Scope portfolio:read. Send X-Arena-Org to
    read an organization sandbox instead. Arena-owned data only while the venue-data switch is off.
  humanURL: https://docs.arena-predictions.com/
  baseURL: https://arena-predictions.com/api/v1
  tags:
  - Portfolio
  properties:
  - type: OpenAPI
    url: openapi/arena-predictions-com-portfolio-api-openapi.yml
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-request-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-owner-scoreboard-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-instrument-book-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-result-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-track-record-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-me-schema.json
- aid: arena-predictions-com:arena-predictions-com-records-api
  name: Arena Records API
  description: 'Arena''s public records: the leaderboards, trader records with their resets, and settled picks. Scope records:read.
    Arena-owned data only: no exchange tickers, market titles, entry prices or live prices. Points equal paper dollars 1:1.'
  humanURL: https://docs.arena-predictions.com/
  baseURL: https://arena-predictions.com/api/v1
  tags:
  - Records
  properties:
  - type: OpenAPI
    url: openapi/arena-predictions-com-records-api-openapi.yml
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-request-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-owner-scoreboard-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-instrument-book-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-result-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-track-record-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-me-schema.json
- aid: arena-predictions-com:arena-predictions-com-status-api
  name: Arena Status API
  description: Is the API up.
  humanURL: https://docs.arena-predictions.com/
  baseURL: https://arena-predictions.com/api/v1
  tags:
  - Status
  properties:
  - type: OpenAPI
    url: openapi/arena-predictions-com-status-api-openapi.yml
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-request-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-owner-scoreboard-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-instrument-book-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-result-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-track-record-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-me-schema.json
- aid: arena-predictions-com:arena-predictions-com-trading-api
  name: Arena Trading API
  description: 'Place and cancel paper orders for the key owner. Scope trade:write, which a key carries only when its creator
    asked for it. Send X-Arena-Org to trade that organization''s paper sandbox. Paper is the default: nothing is sent to a
    venue unless execution is kalshi (trade:write:kalshi), poly-intl (trade:write:poly-intl, Polymarket International only)
    or prophetx (trade:write:prophetx, the key owner''s own ProphetX connection; switched off until Arena opens it). Polymarket
    US is not offered.'
  humanURL: https://docs.arena-predictions.com/
  baseURL: https://arena-predictions.com/api/v1
  tags:
  - Trading
  properties:
  - type: OpenAPI
    url: openapi/arena-predictions-com-trading-api-openapi.yml
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-request-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-owner-scoreboard-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-instrument-book-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-result-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-track-record-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-me-schema.json
- aid: arena-predictions-com:arena-predictions-com-usage-api
  name: Arena Usage API
  description: Where the key's account stands against its plan. Any valid key; never counted.
  humanURL: https://docs.arena-predictions.com/
  baseURL: https://arena-predictions.com/api/v1
  tags:
  - Usage
  properties:
  - type: OpenAPI
    url: openapi/arena-predictions-com-usage-api-openapi.yml
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-request-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-owner-scoreboard-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-instrument-book-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-order-result-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-track-record-response-schema.json
  - type: JSONSchema
    url: json-schema/arena-predictions-com-me-schema.json
x-enrichment:
  date: '2026-11-01'
  status: enriched
  artifacts_added: 52
  pass: modular-v1
  engine: identity=oss,contract=oss,surfaces=oss,docs=oss,regulatory=oss

Arena API — frequently asked questions

Does Arena have an API?

Yes. APIs.io lists 8 APIs from Arena, including Arena API keys API, Arena Identity API and Arena Markets API, and 5 more.

Is there an OpenAPI specification for the Arena API?

Yes. APIs.io indexes 8 OpenAPI specifications for Arena, each linked for download from this page.

How do I authenticate with the Arena API?

Arena documents its authentication (2 schemes). The details are profiled on APIs.io as Arena Predictions Com Authentication.

Does Arena have an MCP server?

Yes. APIs.io lists 1 MCP server for Arena: Remote MCP server at arena-predictions.com.

Is the Arena API ready for AI agents?

Arena has a Kin Score of 54.9 out of 100 (strong) and an Agent Readiness score of 67.6 (agent-native), scored by API Evangelist on 2026-11-02.

Work with this as data

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https://apis.io/mcp

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get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
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