# Zeffy

**Canonical:** https://apis.io/providers/zeffy/  
**Website:** https://www.zeffy.com  
**APIs profiled:** 4

Zeffy is a 100% free fundraising platform for nonprofits - donation forms, event ticketing, peer-to-peer campaigns, memberships, e-commerce, and donor management - with no platform, transaction, or credit-card fees, funded entirely by optional tips from donors. Zeffy exposes a free public REST API that gives organization admins read-only access to their Payments, Contacts, and Campaigns data (base https://api.zeffy.com/api/v1), authenticated with a per-organization API key sent as a Bearer token, plus outbound webhooks that POST payment details to a configured URL when a payment is completed. Zeffy also integrates via Zapier, QuickBooks, and WordPress.

## Kin Score — 21.6 / 100 (emerging)

Scored 2026-08-25 under rubric 0.14.0. Trend: falling (-10.5 from 32.1).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 13.9 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 21.1 |
| Developer Ergonomics | 21.4 |
| Commercial Clarity | 28.9 |
| Access Clarity | 28.9 |

Regulatory layer — **Payments**: 18.8 (matched via tags).

## Agent readiness — 22.9 (agent-aware)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | na |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | na |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | na |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Free · Self-serve signup — onboarding: self-serve, pricing: free, trial: no (confidence: high).

## APIs (4)

- **Zeffy Webhooks** — Outbound webhooks configured under Settings then Integrations. When a payment is completed, Zeffy sends an HTTP POST with the full payment details to the organization's configur...
- **Zeffy Campaigns API** — Donation forms, events, and other campaign types.
- **Zeffy Contacts API** — An organization's donors and supporters.
- **Zeffy Payments API** — An organization's transactions and donations.

## Agentic access (1)

- **Zeffy Agentic Access** — 6 operations

## Security (2)

- **Zeffy Authentication** — http · 1 scheme
- **Zeffy Domain Security** — TLSv1.3 · DNSSEC · DMARC

## Plans (1)

- **Zeffy Plans Pricing**

## Tags

Fundraising, Non-Profit, Donations, Payments, Donor Management, Free, Webhook

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/zeffy/). Scores are computed from the provider's own public artifacts under a published rubric.