# Circle

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

Circle Internet Financial is the issuer of USDC and EURC and operates a developer platform for moving regulated stablecoin money across the internet. Their APIs cover programmable wallets (developer- and user-controlled), gas sponsorship, the Cross-Chain Transfer Protocol (CCTP), Gateway unified balances, the Smart Contract Platform, the Circle Payments Network (CPN) for cross-border payments, compliance, StableFX trading on Arc, and xReserve for issuing USDC-backed stablecoins.

## Kin Score — 41.8 / 100 (developing)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 41.8).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 63.6 |
| Governance | 11.4 |
| Contract Governance | 11.4 |
| Operational Transparency | 26.3 |
| Developer Ergonomics | 38.1 |
| Commercial Clarity | 26.3 |
| Access Clarity | 26.3 |

Regulatory layer — **Payments**: 32.8 (matched via tags).

## Agent readiness — 40.8 (agent-ready)

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

## Access

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

## APIs (7)

- **Gas Station and Paymaster** — Sponsor gas fees on behalf of users or let users pay gas in USDC via Circle Paymaster, removing native-token friction from onboarding.
- **Circle NFTs API** — The NFTs API from Circle — 1 operation(s) for nfts.
- **Circle Signing API** — The Signing API from Circle — 4 operation(s) for signing.
- **Circle Tokens API** — The Tokens API from Circle — 1 operation(s) for tokens.
- **Circle Transactions API** — The Transactions API from Circle — 12 operation(s) for transactions.
- **Circle Wallet Sets API** — The Wallet Sets API from Circle — 4 operation(s) for wallet sets.
- **Circle Wallets API** — The Wallets API from Circle — 7 operation(s) for wallets.

## MCP servers (1)

- **Circle MCP Server**

## Agentic access (1)

- **Circle Agentic Access** — 30 operations · 18 acting · 3 human-in-the-loop

## Security (2)

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

## Plans (1)

- **Circle Plans Pricing**

## Tags

Blockchain, Compliance, Cross-Chain, Currency, Money, Payments, Stablecoins, Transfers, USDC, Wallets

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