Helcim vs Square Payments

Helcim and Square Payments are both Online Card Payment APIs, compared here on pricing, compliance, capabilities, and developer experience from structured, cited data - not reviews or paid placement. Helcim starts lower at $0.08 transaction + percent vs $0.30 for Square Payments. On compliance, Square Payments additionally documents SOC 2, GDPR. For coding-agent use, Square Payments scores higher on agent-friendliness (65 vs 45).

Comparedby a transparent data-readiness score computed from each API's published, sourced fields. No reviews, no paid placement. How we rank.

Data last verified 2026-06-21, with every field cited on each profile.

Head-to-head, from published, cited fields (auto-generated; no paid placement)
Field	Helcim	Square Payments
Starting price	$0.08 transaction + percent	$0.30 transaction + percent
Pricing model	Usage	Hybrid
Free tier	✗	✗
Self-serve signup	✓	✓
SOC 2	·	Type II
HIPAA	✗	·
GDPR	✗	✓
Webhooks	✓	✓
Sandbox	✓	✓
Documented actions	23	26

Full data and citations: Helcim · Square Payments. See more Online Card Payment APIs.