# Overflow

**Canonical:** https://apis.io/providers/overflow/  
**Website:** https://docs.overflow.co  
**APIs profiled:** 13

Overflow is a fintech giving platform for churches and nonprofits that lets organizations accept and reconcile donations across many asset types — card and ACH, Apple Pay and Google Pay, stock, cryptocurrency, RoundUps, and Donor Advised Funds (DAFs) — through a single unified platform. Overflow also offers Overflow Tap (NFC tap-to-give hardware) and Generosity University donor education. Its public Overflow Open API (v3) is a REST interface over contributions, donors, subscriptions (recurring gifts), payments, campaigns, deposits, refunds, chargebacks, locations, tap devices/events, and webhooks, authenticated with header API keys and used to sync giving data into CRMs and accounting/reconciliation workflows. Overflow is backed by Uncork Capital.

## Kin Score — 49.4 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 49.4).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 63.0 |
| Governance | 16.7 |
| Contract Governance | 16.7 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 61.3 |
| Commercial Clarity | 34.2 |
| Access Clarity | 34.2 |

Regulatory layer — **Payments**: 39.1 (matched via tags).

## Agent readiness — 43.7 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | documented |
| MCP Server | no |
| Auth Clarity | yes |
| Idempotency | no |
| Error Semantics | documented |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | yes |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |

## Access

Self-serve signup — onboarding: self-serve, pricing: unknown, trial: no (confidence: medium).

## APIs (13)

- **Overflow Campaigns API** — The Campaigns API from Overflow — 2 operation(s) for campaigns.
- **Overflow Chargebacks API** — The Chargebacks API from Overflow — 2 operation(s) for chargebacks.
- **Overflow Contributions API** — The Contributions API from Overflow — 3 operation(s) for contributions.
- **Overflow Deposits API** — The Deposits API from Overflow — 3 operation(s) for deposits.
- **Overflow Donors API** — The Donors API from Overflow — 2 operation(s) for donors.
- **Overflow Locations API** — The Locations API from Overflow — 2 operation(s) for locations.
- **Overflow Payment Methods API** — The Payment Methods API from Overflow — 1 operation(s) for payment methods.
- **Overflow Payments API** — The Payments API from Overflow — 1 operation(s) for payments.
- **Overflow Refunds API** — The Refunds API from Overflow — 2 operation(s) for refunds.
- **Overflow Status API** — The Status API from Overflow — 1 operation(s) for status.
- **Overflow Subscriptions API** — The Subscriptions API from Overflow — 3 operation(s) for subscriptions.
- **Overflow Tap API** — The Tap API from Overflow — 7 operation(s) for tap.
- **Overflow Webhooks API** — The Webhooks API from Overflow — 3 operation(s) for webhooks.

## MCP servers (1)

- **Overflow MCP Server**

## Agentic access (1)

- **Overflow Agentic Access** — 38 operations · 8 acting · 8 human-in-the-loop

## Security (2)

- **Overflow Authentication** — apiKey · 2 schemes
- **Overflow Domain Security** — TLSv1.3 · HSTS · DMARC

## Tags

Company, Fintech, Payments, Donations, Fundraising, Non-Profit, Giving, Recurring Payments, Webhook, Cryptocurrency

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