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 📡 Profile data on GitHub

35.5/100 thin ▬ flat Agent 39/100 agent ready Front door AI 3/6 light Heartbeat 96/100 alive saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

0 APIs 1 MCP Servers

Stablecoins Payments Card Issuing Fintech Cross-Border Payments Cryptocurrency Wallets Money Movement

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 35.5/100 · thin

Contract Quality 8.3 / 21

Developer Ergonomics 2.4 / 17

Access Clarity 8.5 / 17

Operational Transparency 2.6 / 11

Contract Governance 1.9 / 10

Discoverability 4.7 / 9

Regulatory Posture 5.1 / 15

Agent readiness — 39/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 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 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 6 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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<a href="https://apis.io/providers/rain/"><img src="https://apis.io/badge/rain/card.svg" alt="Rain on APIs.io — Kin Score by API Evangelist"></a>

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Agent readiness — checks not met, largest first (exact, from this profile):

Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link

6 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Developer Ergonomics scores 14.3 — up to +17.1 composite points
Contract Quality scores 39.0 — up to +15.3 composite points
Access Clarity scores 50.0 — up to +10.0 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/rain/apis.yml: open an issue on github.com/api-evangelist/rain to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Stablecoins and Tokenization (stablecoin issuers, tokenized assets)	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 3

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

MCP Servers 1

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

Rain docs MCP

Remote MCP server at docs.rain.xyz over HTTP; 1 tool listed.

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)

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
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: false
  label: Hosted service · you call their endpoint
  confidence: medium
  source:
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - security
  - sandbox
  generated: '2026-11-06'
  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: '0.23'
created: '2026-07-17'
modified: '2026-07-20'
x-docs-platform: mintlify
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-04
x-docs-hosting: vercel
tags:
- Stablecoins
- Payments
- Card Issuing
- Fintech
- Cross-Border Payments
- Cryptocurrency
- Wallets
- Money Movement
tags_raw:
- 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

Rain API — frequently asked questions

Does Rain have an MCP server?

Yes. APIs.io lists 1 MCP server for Rain: Remote MCP server at docs.rain.xyz over HTTP; 1 tool listed.

Is the Rain API ready for AI agents?

Rain has a Kin Score of 35.5 out of 100 (thin) and an Agent Readiness score of 39.4 (agent-ready), scored by API Evangelist on 2026-11-06.

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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