Rainbow
Rainbow — formerly Riverse, whose riverse.io domain now 301s to rainbowstandard.io — is a carbon crediting programme and registry that certifies and issues Rainbow Carbon Credits (RCCs) from engineered carbon removal and greenhouse-gas reduction projects across biochar, BiCRS/BioCCS, enhanced rock weathering, ex-situ mineralization, biogas from anaerobic digestion, biobased construction materials, battery second life and electronics refurbishment. The programme is ICVCM Core-Carbon-Principles approved, ICROA endorsed, approved as a Frontier credit issuer, and runs EU CRCF-compliant plus CORSIA and Paris Agreement Article 6 crediting tracks. It operates two platforms: Arc (arc.rainbowstandard.io), the project-developer certification and MRV platform launched October 2025, and the public Rainbow Registry (registry.rainbowstandard.io) where every project, credit block, serial number and retirement is published. Its public surface is a 163-page GitBook documentation hub of standard rules, procedures, methodologies, fees and governance policies, served with a real llms.txt and a Content-Signal AI-usage declaration. No OpenAPI, AsyncAPI, GraphQL SDL, SDK, MCP server or A2A agent card is served on any Rainbow host; the only public acknowledgement that an API exists at all is a single line in the published fee schedule confirming that API connections carry no additional cost.
Rainbow is profiled on the APIs.io network. Tagged areas include Company, Carbon Credits, Carbon Removal, Carbon Markets, and Sustainability.
Rainbow’s developer surface includes documentation, getting-started guide, support, engineering blog, pricing, changelog, and 18 more developer resources.
Kin Score
Pricing Plans 1
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Riverse Rate Limits
RATE LIMITSSecurity Posture 3
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Get Started 2
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 3
Pagination, idempotency, versioning, errors, and events
Access & Security 6
Authentication, authorization, and security posture
Operate 4
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 1
Properties that don't map to a standard resource type