Rain

Rain is an enterprise stablecoin payments platform that lets companies embed digital-dollar money movement into their products through a single API. Its infrastructure spans stablecoin wallets and virtual accounts, card issuing (Rain is a Visa and Mastercard Principal Member, settling Visa card transactions daily in stablecoins across multiple blockchains), and money movement via fiat on-ramps, off-ramps, and cross-border payment orchestration. Rain abstracts the back-end complexity of making on-chain stablecoins interoperable with traditional card networks, and maintains PCI DSS and SOC 2 compliance. Customers include Western Union, Nuvei, and ether.fi. Rain has raised over $338M, including a $250M Series C led by ICONIQ and a Series B led by Sapphire Ventures.

Rain is profiled on the APIs.io network. Tagged areas include Stablecoins, Payments, Card Issuing, Fintech, and Cross-Border Payments.

The Rain catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Rain’s developer surface includes documentation, engineering blog, support, signup flow, sandbox, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub
36.1/100 thin ▬ flat Agent 21/100 agent aware Full breakdown ↓
scored 2026-07-27 · rubric v0.5
0 APIs 1 MCP Servers
StablecoinsPaymentsCard IssuingFintechCross-Border PaymentsCryptoWalletsMoney MovementAPI

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 36.1/100 · thin
Contract Quality 5.7 / 25
Developer Ergonomics 7.8 / 20
Commercial Clarity 10.0 / 20
Operational Transparency 3.1 / 13
Governance 0.0 / 12
Discoverability 6.8 / 10
Agent readiness — 21/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/rain: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Rain docs MCP

MCP SERVER

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Rain Webhooks

ASYNCAPI

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Rain Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Rain Trust Center

PCI DSS, SOC 2

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 SignUp
SignUp
 Sandbox
Sandbox

Documentation 1

Reference material describing how the API behaves

Documentation
Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 MCPServer
MCPServer

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 Lifecycle
Lifecycle
 Webhooks
Webhooks

Access & Security 3

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 TrustCenter
TrustCenter
 Compliance
Compliance

Operate 2

Status, limits, changes, and where to get help

StatusPage
StatusPage
 Support
Support

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: rain
name: Rain
description: Rain is an enterprise stablecoin payments platform that lets companies embed digital-dollar money movement into
  their products through a single API. Its infrastructure spans stablecoin wallets and virtual accounts, card issuing (Rain
  is a Visa and Mastercard Principal Member, settling Visa card transactions daily in stablecoins across multiple blockchains),
  and money movement via fiat on-ramps, off-ramps, and cross-border payment orchestration. Rain abstracts the back-end complexity
  of making on-chain stablecoins interoperable with traditional card networks, and maintains PCI DSS and SOC 2 compliance.
  Customers include Western Union, Nuvei, and ether.fi. Rain has raised over $338M, including a $250M Series C led by ICONIQ
  and a Series B led by Sapphire Ventures.
url: https://raw.githubusercontent.com/api-evangelist/rain/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://cdn.prod.website-files.com/69af05389f32bed4dc0b35e0/6a556490090af8abcdcfcd24_rain-favicon-2026.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- 500-global
- iconiq-capital
- lightspeed-venture-partners
- paradigm
- prosus-ventures
- qed-investors
- sapphire-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
tags:
- Stablecoins
- Payments
- Card Issuing
- Fintech
- Cross-Border Payments
- Crypto
- Wallets
- Money Movement
- API
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/rain-domain-security.yml
- type: Website
  url: https://www.rain.xyz
- type: DeveloperPortal
  url: https://docs.rain.xyz
- type: Documentation
  url: https://docs.rain.xyz
- type: Blog
  url: https://www.rain.xyz/blog
- type: StatusPage
  url: https://status.rain.xyz
  name: Rain Status
- type: Support
  url: https://www.rain.xyz/contact-us
- type: SignUp
  url: https://use.rain.xyz
- type: TermsOfService
  url: https://www.rain.xyz/legal-center/legal
- type: PrivacyPolicy
  url: https://www.rain.xyz/legal-center/legal
- type: TrustCenter
  url: https://trust.rain.xyz
  name: Rain Trust Center
- type: Compliance
  url: https://trust.rain.xyz
  name: PCI DSS + SOC 2
- type: Conformance
  url: conformance/rain-conformance.yml
- type: Lifecycle
  url: lifecycle/rain-lifecycle.yml
- type: Webhooks
  url: asyncapi/rain-webhooks.yml
- type: Sandbox
  url: sandbox/rain-sandbox.yml
- type: LLMsTxt
  url: llms/rain-llms.txt
- type: WellKnown
  url: well-known/rain-well-known.yml
- type: MCPServer
  url: mcp/rain-mcp.yml
  name: Rain docs MCP
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 10
  pass: local-v1