DepthFeed

DepthFeed provides Polymarket and Kalshi historical order‑book data with aligned reference prices, offering REST access, live WebSocket updates, and explicit coverage documentation for prediction‑market depth data.

DepthFeed is listed with 1 API on the APIs.io network. Tagged areas include Finance, Data, Market Data, and Prediction Markets.

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

DepthFeed’s developer surface includes pricing, documentation, and 16 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

34.7/100 thin Agent 16/100 agent aware Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 API 1 MCP Servers

Finance Data Market Data Prediction Markets

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 34.7/100 · thin

Contract Quality 5.6 / 21

Developer Ergonomics 3.2 / 17

Access Clarity 13.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 2.2 / 10

Discoverability 5.1 / 9

Regulatory Posture 3.5 / 15

Agent readiness — 16/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 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 Securities & Market Data 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):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)

11 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 26.3 — up to +18.4 composite points
Developer Ergonomics scores 19.0 — up to +16.2 composite points
Operational Transparency scores 0.0 — up to +13.0 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/depthfeed-com/apis.yml: open an issue on github.com/api-evangelist/depthfeed-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 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.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

APIs 1

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

DepthFeed API

DepthFeed API as documented publicly: 79 operations. Contract generated from the documentation by API Evangelist (2026-11-05); not the provider's own document.

MCP Servers 1

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

DepthFeed MCP Server

Remote MCP server at api.depthfeed.com.

MCP SERVER

DepthFeed API pricing

Prices published by DepthFeed, read 2026-11-05 from depthfeed.com/pricing.

Plan	Price
Explorer	$0 Free, no card
Quant	$29/month per month, billed monthly
Research	$99/month per month, 1-day free trial
Desk	$249/month per month, billed monthly

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Depthfeed Com Plans Pricing

4 plans

PLANS

Semantic Vocabularies 1

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

Depthfeed Com Context

63 classes · 29 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

DepthFeed API Rules

46 rules · 40 errors 3 warnings 3 info

SPECTRAL

JSON Schema 6

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

GetV3ScreenerResponse

4 properties

JSON SCHEMA

GetV3SportsBooksAssetidHistoryResponse

4 properties

JSON SCHEMA

GetV3WhoamiResponse

2 properties

JSON SCHEMA

PostPaperHookTokenRequest

6 properties

JSON SCHEMA

PostPaperHookTokenResponse

7 properties

JSON SCHEMA

PostV3SportsWebhooksRequest

3 properties

JSON SCHEMA

Security Posture 1

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

Depthfeed Com Domain Security

TLSv1.3 · HSTS

SECURITY

Resources

Get Started 2

Portal, sign-up, and the first successful call

Login

DeveloperPortal

DeveloperPortal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Conformance

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: depthfeed-com
name: DepthFeed
description: DepthFeed provides Polymarket and Kalshi historical order‑book data with aligned reference prices, offering REST
  access, live WebSocket updates, and explicit coverage documentation for prediction‑market depth data.
url: https://depthfeed.comml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-05 (modular-v1; was harvest)
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  probe_state: unreadable
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
specificationVersion: '0.20'
created: '2026-11-05'
modified: '2026-11-05'
tags:
- Finance
- Data
- Market Data
- Prediction Markets
tags_raw:
- Finance
- Data
- MarketData
- PredictionMarkets
- API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/depthfeed-com-plans-pricing.yml
- type: Spectral
  url: rules/depthfeed-com-rules.yml
- type: JSONLD
  url: json-ld/depthfeed-com-context.jsonld
- type: Vocabulary
  url: vocabulary/depthfeed-com-vocabulary.yml
- type: DataModel
  url: data-model/depthfeed-com-data-model.yml
- type: Conformance
  url: conformance/depthfeed-com-conformance.yml
- type: LLMsTxt
  url: llms/depthfeed-com-llms.txt
- type: MCPServer
  url: mcp/depthfeed-com-mcp.yml
- type: Hosts
  url: hosts/depthfeed-com-hosts.yml
- type: Vendors
  url: vendors/depthfeed-com-vendors.yml
- type: TermsOfService
  url: https://depthfeed.com/terms
- type: PrivacyPolicy
  url: https://depthfeed.com/privacy
- type: Pricing
  url: https://depthfeed.com/pricing
- type: Login
  url: https://depthfeed.com/login
- type: Documentation
  url: https://depthfeed.com/docs
- type: DeveloperPortal
  url: https://api.depthfeed.com<!--
- type: DomainSecurity
  url: security/depthfeed-com-domain-security.yml
- type: Website
  url: https://depthfeed.com/
apis:
- aid: depthfeed-com:depthfeed-com-api
  name: DepthFeed API
  description: 'DepthFeed API as documented publicly: 79 operations. Contract generated from the documentation by API Evangelist
    (2026-11-05); not the provider''s own document.'
  humanURL: https://depthfeed.com/data-api
  baseURL: https://api.depthfeed.com
  properties:
  - type: OpenAPI
    url: openapi/_ae-authored/depthfeed-com-openapi-generated.yml
    x-provenance: generated
  - type: JSONSchema
    url: json-schema/depthfeed-com-post-paper-hook-token-request-schema.json
  - type: JSONSchema
    url: json-schema/depthfeed-com-post-paper-hook-token-response-schema.json
  - type: JSONSchema
    url: json-schema/depthfeed-com-get-v3-whoami-response-schema.json
  - type: JSONSchema
    url: json-schema/depthfeed-com-get-v3-sports-books-assetid-history-response-schema.json
  - type: JSONSchema
    url: json-schema/depthfeed-com-get-v3-screener-response-schema.json
  - type: JSONSchema
    url: json-schema/depthfeed-com-post-v3-sports-webhooks-request-schema.json
x-coverage:
  state: unreadable
  reason: no-machine-readable-spec
  detail: Documentation provides API reference but no OpenAPI/AsyncAPI/GraphQL spec is published.
  evidence:
  - url: https://depthfeed.com/docs
    status: 200
  checked: '2026-11-05'
x-enrichment:
  date: '2026-11-05'
  status: enriched
  artifacts_added: 24
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

DepthFeed API — frequently asked questions

Does DepthFeed have an API?

Yes. APIs.io lists 1 API from DepthFeed, including DepthFeed API.

Is there an OpenAPI specification for the DepthFeed API?

Yes. APIs.io indexes 1 OpenAPI specification for DepthFeed, each linked for download from this page.

How much does the DepthFeed API cost?

DepthFeed publishes its prices; its Explorer plan is $0 Free, no card as of 2026-11-05. APIs.io lists 4 pricing plans for DepthFeed, with each plan's price, limits and inclusions under Pricing on this page.

Does DepthFeed have an MCP server?

Yes. APIs.io lists 1 MCP server for DepthFeed: Remote MCP server at api.depthfeed.com.

Is the DepthFeed API ready for AI agents?

DepthFeed has a Kin Score of 34.7 out of 100 (thin) and an Agent Readiness score of 16.4 (agent-aware), scored by API Evangelist on 2026-11-06.

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