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apis.json,llms.txtand similar), its public repositories, and its public status, pricing and changelog pages. Nothing here is obtained by breaching a system, defeating an access control, or using credentials of any kind.The rating is an independent assessment. The Kin Score and Agent Readiness rating are independently calculated scores of a company's public API artifacts, produced by API Evangelist against a published rubric. They are not certifications, endorsements, security assessments, or audits, and they score published artifacts — not the quality, safety, or security of the software.
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Full detail: Where this data comes from
Klutch (Klutch Card) issues an "app-powered" programmable credit card — Klutch Credit (unsecured) and Klutch Spend (collateralized prepaid) — whose behavior is extended by user-installable Mini Apps. Its public GraphQL API exposes enriched card transactions with acquirer metadata, virtual card lifecycle, server-side transaction rules that approve or decline spend in real time, account balances, ACH card payments, and Mini App panel rendering.
- Website: https://klutchcard.com
- Developers: https://www.klutchcard.com/developer
- API reference (Postman): https://api-docs.klutchcard.com/
- GitHub: https://github.com/KlutchCard
| Style | GraphQL (single endpoint, introspection disabled) |
| Production | https://graphql.klutchcard.com/graphql |
| Sandbox | https://sandbox.klutchcard.com/graphql |
| Auth | Bearer session token (createSessionToken) or OAuth 2.1 authorization code + PKCE |
| MCP | https://mcp.klutchcard.com (remote, OAuth-protected, Claude + ChatGPT) |
| Events | Transaction webhooks (registered in the account UI) |
| Artifact | File |
|---|---|
| Operation catalog | graphql/klutch-graphql-operations.yml |
| Postman collection (verbatim) | postman/klutch-public-api-postman.json |
| Packages / SDKs | packages/klutch-packages.yml |
| CLI | cli/klutch-cli.yml |
| Mini App components | components/klutch-components.yml |
| MCP server | mcp/klutch-mcp.yml |
| Agent Skills | skills/_index.yml |
| Authentication | authentication/klutch-authentication.yml |
| OAuth scopes | scopes/klutch-scopes.yml |
| Well-known | well-known/klutch-well-known.yml |
| Conventions | conventions/klutch-conventions.yml |
| Errors | errors/klutch-error-codes.yml |
| Webhook catalog | asyncapi/klutch-webhooks.yml |
| Sandbox | sandbox/klutch-sandbox.yml |
| Data model | data-model/klutch-data-model.yml |
| Lifecycle | lifecycle/klutch-lifecycle.yml |
| Conformance | conformance/klutch-conformance.yml |
| Domain security | security/klutch-domain-security.yml |
| llms.txt | llms/klutch-llms.txt |
No OpenAPI or AsyncAPI document, no security.txt, no status page, no published changelog, no deprecation policy, no documented rate limits, and no idempotency contract — which matters, because createPayment moves money.
Backed by: 500 Global, Bain Capital Ventures.