# Stannp

**Canonical:** https://apis.io/providers/stannp/  
**Website:** https://www.stannp.com  
**APIs profiled:** 7

Stannp is a direct mail platform that enables businesses to send physical postcards and letters programmatically via a REST API. The platform lets developers create campaigns, upload recipient lists, trigger individual mail pieces in real time, and track print and delivery status through webhooks and event endpoints. Authentication uses API key-based HTTP Basic Auth over HTTPS, and the API follows a simple JSON response envelope with success/data or success/error fields. Stannp serves businesses across the UK, US, and Canada with per-item pricing for letters and postcards at scale, and supports no-code integrations through Zapier and Make as well as official SDKs for PHP, Go, and C#.

## Kin Score — 78.5 / 100 (exemplar)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 78.5).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 76.8 |
| Governance | 40.2 |
| Contract Governance | 40.2 |
| Operational Transparency | 68.4 |
| Developer Ergonomics | 73.2 |
| Commercial Clarity | 93.4 |
| Access Clarity | 93.4 |

Regulatory layer — **Telecommunications**: 56.9 (matched via tags).

## Agent readiness — 38.6 (agent-ready)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | documented |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | verified |
| 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 |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

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

## APIs (7)

- **Stannp Account API** — Account balance and user information
- **Stannp Campaigns API** — Manage batch direct mail campaigns
- **Stannp Events API** — Record recipient engagement and conversion events
- **Stannp Groups API** — Manage recipient groups
- **Stannp Letters API** — Create, post, retrieve, and cancel letter mailpieces
- **Stannp Postcards API** — Create, retrieve, and cancel postcard mailpieces
- **Stannp Recipients API** — Manage individual recipients and bulk imports

## MCP servers (1)

- **Stannp MCP Server**

## Agentic access (1)

- **Stannp Agentic Access** — 32 operations · 23 acting

## Security (4)

- **Stannp Authentication** — http/apiKey · 3 schemes
- **Stannp Domain Security** — TLSv1.3 · HSTS · DMARC
- **Stannp Vulnerability Disclosure** — Hackerone · contact published
- **Stannp Trust Center** — HIPAA, ISO 27001, ISO 9001, GDPR, ICO registration ZA134992 (UK Data Processor), USPS CASS certification, Royal Mail PAF accreditation, Royal Mail Mail Made Easy partner, Securi...

## Plans (1)

- **Stannp Plans Pricing**

## Tags

Direct Mail, Postcards, Letters, Print, Physical Mail, Marketing Automation, Campaigns, Address Verification, SMS, Webhook, Mailing Lists, Fulfillment

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