Let's Do This

Let's Do This is an endurance-events marketplace where participants discover and register for mass-participation sport — marathons, road races, trail runs, triathlons, obstacle races and cycling events — across the United Kingdom and the United States. The platform covers event discovery, entry purchase and entry management, team entries, memberships, referral credits and discount codes, and it works with event organisers and charity partners who list and sell places through it. Backed by EQT Ventures. As of July 2026 Let's Do This publishes no public API program: there is no developer portal, API documentation, machine-readable specification, SDK or webhook surface. A live but undocumented GraphQL endpoint backs the consumer marketplace with introspection disabled.

Let’s Do This is listed with 1 API on the APIs.io network. Tagged areas include Company, Fitness Tech, Endurance Sports, Event, and Event Registration.

Let’s Do This’ developer surface includes engineering blog and 4 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

7.5/100 minimal ▬ flat Agent 11/100 agent aware Full breakdown ↓
scored 2026-11-02 · rubric v0.26.0 · Show this score on your site →

1 API 1 MCP Servers

CompanyFitness TechEndurance SportsEvent Event Registration Marketplace Ticketing Consumer

Kin Score

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

Composite quality — 7.5/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 1.2 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 6.4 / 9

Regulatory Posture 0.9 / 15

Agent readiness — 11/100 · agent aware

Machine-Readable Contract 0 / 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 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document
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

12 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points
Access Clarity scores 0.0 — up to +20.0 composite points
Developer Ergonomics scores 7.1 — up to +18.6 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/lets-do-this/apis.yml: open an issue on github.com/api-evangelist/lets-do-this 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 →

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
Events and Ticketing Platforms	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.

Model Context Protocol (MCP)

measured — observed by APIs.io (verified)

APIs 1

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

Let's Do This GraphQL (undocumented)

Live GraphQL endpoint backing the Let's Do This consumer marketplace. Discovered by probe, not published as a developer product: no documentation, no published schema, no docume...

MCP Servers 1

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

Let's Do This MCP Server

Remote MCP server at mcp.letsdothis.com over HTTP; 1 tool listed.

MCP SERVER

Security Posture 1

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

Lets Do This Domain Security

TLSv1.3 · DNSSEC · DMARC

SECURITY

Resources

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Operate 1

Status, limits, changes, and where to get help

HelpCenter

HelpCenter

Company 2

The organization behind the API

Blog

Blog

Website

Website

Source (apis.yml)

aid: lets-do-this
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  gated_conflict: 'x-api-posture: private but 1 published API entry'
  label: Unknown
  confidence: low
  source:
  - security
  generated: '2026-11-02'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/lets-do-this.png
name: Let's Do This
description: 'Let''s Do This is an endurance-events marketplace where participants discover and register for mass-participation
  sport — marathons, road races, trail runs, triathlons, obstacle races and cycling events — across the United Kingdom and
  the United States. The platform covers event discovery, entry purchase and entry management, team entries, memberships,
  referral credits and discount codes, and it works with event organisers and charity partners who list and sell places through
  it. Backed by EQT Ventures. As of July 2026 Let''s Do This publishes no public API program: there is no developer portal,
  API documentation, machine-readable specification, SDK or webhook surface. A live but undocumented GraphQL endpoint backs
  the consumer marketplace with introspection disabled.'
url: https://raw.githubusercontent.com/api-evangelist/lets-do-this/refs/heads/main/apis.yml
x-api-posture: no-product-api
x-api-posture-basis: observed
x-api-posture-note: 'As of July 2026 Let''s Do This publishes no public API program: there is no developer portal, API documentation,
  machine-readable specification, SDK or webhook surface.'
x-type: company
x-source: vc-portfolio
x-backed-by:
- eqt-ventures
x-tier: stub
x-tier-reason: no-public-api-program
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-10-06'
tags:
- Company
- Fitness Tech
- Endurance Sports
- Event
- Event Registration
- Marketplace
- Ticketing
- Consumer
tags_raw:
- Company
- Fitness Tech
- Endurance Sports
- Events
- Event Registration
- Marketplace
- Ticketing
- Consumer
apis:
- name: Let's Do This GraphQL (undocumented)
  description: 'Live GraphQL endpoint backing the Let''s Do This consumer marketplace. Discovered by probe, not published
    as a developer product: no documentation, no published schema, no documented authentication and no third-party terms of
    use. Introspection is disabled, so no schema could be captured. Recorded as a factual discovery only — not a supported
    public API.'
  humanURL: https://www.letsdothis.com/
  baseURL: https://graphql.letsdothis.com/graphql
  x-status: undocumented
  x-discovery: probed
  tags:
  - GraphQL
  - Undocumented
  properties:
  - type: GraphQL
    url: graphql/lets-do-this-graphql-endpoint.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- url: https://www.letsdothis.com/press
  type: Blog
- type: DomainSecurity
  url: security/lets-do-this-domain-security.yml
- type: Website
  url: https://www.letsdothis.com/
- type: HelpCenter
  url: https://help.letsdothis.com/
- type: LLMsTxt
  url: llms/lets-do-this-llms.txt
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence

Let's Do This API — frequently asked questions

Does Let's Do This have an API?

Yes. APIs.io lists 1 API from Let's Do This, including Let's Do This GraphQL (undocumented).

Does Let's Do This have an MCP server?

Yes. APIs.io lists 1 MCP server for Let's Do This: Remote MCP server at mcp.letsdothis.com over HTTP; 1 tool listed.

Is the Let's Do This API ready for AI agents?

Let's Do This has a Kin Score of 7.5 out of 100 (minimal) and an Agent Readiness score of 11.4 (agent-aware), scored by API Evangelist on 2026-11-02.

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