flexyield-io

FlexYield provides a unified API gateway that aggregates JSON-RPC traffic across multiple blockchain providers, offering automatic failover, a single billing meter, and support for several major chains including Ethereum, Base, Arbitrum, Optimism, Polygon, and Solana. Users can start for free without a wallet or crypto, access a toolbox of utilities, and view real-time uptime and performance metrics. The platform aims to simplify blockchain integration by consolidating endpoints, reducing complexity, and delivering transparent pricing.

flexyield-io publishes 7 API contracts indexed on the APIs.io network, including Agents API, Data API, Keys API, and 4 more. Tagged areas include Blockchain, API Gateway, Unified Billing, Multi-Chain, and Free Tier.

The flexyield-io catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

flexyield-io’s developer surface includes changelog, authentication, documentation, API reference, getting-started guide, pricing, support, and 27 more developer resources.

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61.3/100 strong Agent 37/100 agent ready Full breakdown ↓
scored 2026-10-31 · rubric v0.25.0 · Show this score on your site →

1 published contract 1 MCP Servers

Blockchain API GatewayUnified BillingMulti-Chain Free Tier

Kin Score

Kin Score How this is scored →
scored 2026-10-31 · rubric v0.25.0

Composite quality — 61.3/100 · strong

Contract Quality 11.2 / 21

Developer Ergonomics 9.3 / 17

Access Clarity 10.2 / 17

Operational Transparency 5.8 / 11

Contract Governance 8.1 / 10

Discoverability 5.5 / 9

Regulatory Posture 4.6 / 15

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) 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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Agent readiness — checks not met, largest first (exact, from this profile):

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)
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
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks

6 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 52.9 — up to +11.8 composite points
Developer Ergonomics scores 54.8 — up to +9.0 composite points
Access Clarity scores 60.0 — up to +8.0 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/flexyield-io/apis.yml: open an issue on github.com/api-evangelist/flexyield-io 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 →

APIs 7

Individual APIs this provider publishes, each with its own machine-readable definition.

flexyield-io Agents API

The Agents API from flexyield-io — 1 operation(s) for agents.

flexyield-io Data API

The Data API from flexyield-io — 2 operation(s) for data.

flexyield-io Keys API

The Keys API from flexyield-io — 3 operation(s) for keys.

flexyield-io Rpc API

The Rpc API from flexyield-io — 1 operation(s) for rpc.

flexyield-io Statements API

The Statements API from flexyield-io — 2 operation(s) for statements.

flexyield-io Toolbox API

The Toolbox API from flexyield-io — 7 operation(s) for toolbox.

flexyield-io X402 API

The X402 API from flexyield-io — 2 operation(s) for x402.

Scroll for all 7

MCP Servers 1

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

flexyield-io MCP Server

Remote MCP server at flexyield.io.

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Flexyield Io Plans Pricing

6 plans

PLANS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Flexyield Io Context

3 classes · 6 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

flexyield-io API Rules

12 rules · 8 errors 2 warnings 2 info

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

JsonRpcRequest

4 properties

JSON SCHEMA

JsonRpcResponse

4 properties

JSON SCHEMA

Security Posture 3

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

Flexyield Io Authentication

apiKey/http · 2 schemes

SECURITY

Flexyield Io Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Flexyield Io Vulnerability Disclosure

security.txt · contact published

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Flexyield Io Agentic Access

18 operations · 6 acting · 1 human-in-the-loop

18 operations · 6 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

LLMsTxt

MCPServer

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 2

SDKs, sample code, and the tooling you integrate with

DeclineCodes

DeclineCodes

GitHubOrganization

GitHubOrganization

Access & Security 6

Authentication, authorization, and security posture

Security

SecurityTxt

SecurityTxt

Authentication

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 5

Status, limits, changes, and where to get help

ChangeLog

StatusPage

ChangeLog

Roadmap

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

Company 1

The organization behind the API

Website

Website

Other 2

Properties that don't map to a standard resource type

AgentCard

AgentCard

Hosts

Hosts

Source (apis.yml)

aid: flexyield-io
name: flexyield-io
image: https://flexyield.io/og.png
description: FlexYield provides a unified API gateway that aggregates JSON-RPC traffic across multiple blockchain providers,
  offering automatic failover, a single billing meter, and support for several major chains including Ethereum, Base, Arbitrum,
  Optimism, Polygon, and Solana. Users can start for free without a wallet or crypto, access a toolbox of utilities, and view
  real-time uptime and performance metrics. The platform aims to simplify blockchain integration by consolidating endpoints,
  reducing complexity, and delivering transparent pricing.
url: https://artifacts.apis.io/flexyield-io/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-30 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-30'
modified: '2026-10-30'
tags:
- Blockchain
- API Gateway
- Unified Billing
- Multi-Chain
- Free Tier
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/flexyield-io-agentic-access.yml
- type: Plans
  url: plans/flexyield-io-plans-pricing.yml
- type: Spectral
  url: rules/flexyield-io-rules.yml
- type: JSONLD
  url: json-ld/flexyield-io-context.jsonld
- type: Vocabulary
  url: vocabulary/flexyield-io-vocabulary.yml
- type: DataModel
  url: data-model/flexyield-io-data-model.yml
- type: ChangeLog
  url: changelog/flexyield-io-changelog.yml
- type: Security
  url: https://flexyield.io/terms
- type: DeclineCodes
  url: errors/flexyield-io-decline-codes.yml
- type: ErrorCatalog
  url: errors/flexyield-io-problem-types.yml
- type: Conformance
  url: conformance/flexyield-io-conformance.yml
- type: LLMsTxt
  url: llms/flexyield-io-llms.txt
- type: AgentCard
  url: a2a/flexyield-io-a2a.yml
- type: MCPServer
  url: mcp/flexyield-io-mcp.yml
- type: SecurityTxt
  url: well-known/flexyield-io-security.txt
- type: SecurityTxt
  url: well-known/flexyield-io-dev-security.txt
- type: WellKnown
  url: well-known/flexyield-io-well-known.yml
- type: Hosts
  url: hosts/flexyield-io-hosts.yml
- type: StatusPage
  url: https://flexyield.io/status
- type: DeveloperPortal
  url: https://dev.flexyield.io/
- type: ChangeLog
  url: https://flexyield.io/changelog
- type: Authentication
  url: authentication/flexyield-io-authentication.yml
- type: VulnerabilityDisclosure
  url: security/flexyield-io-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/flexyield-io-domain-security.yml
- type: Website
  url: https://flexyield.io/
- type: Documentation
  url: https://flexyield.io/docs
- type: APIReference
  url: https://flexyield.io/docs
- type: GettingStarted
  url: https://flexyield.io/docs
- type: Pricing
  url: https://flexyield.io/pricing
- type: TermsOfService
  url: https://flexyield.io/terms
- type: PrivacyPolicy
  url: https://flexyield.io/privacy
- type: Roadmap
  url: https://flexyield.io/roadmap
- type: Support
  url: https://flexyield.io/support
- type: GitHubOrganization
  url: https://github.com/1909-Works/flexyield-io
apis:
- aid: flexyield-io:flexyield-io-agents-api
  name: flexyield-io Agents API
  description: The Agents API from flexyield-io — 1 operation(s) for agents.
  humanURL: https://flexyield.io/docs
  baseURL: https://flexyield.io
  tags:
  - Agents
  properties:
  - type: OpenAPI
    url: openapi/flexyield-io-agents-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-request-schema.json
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-response-schema.json
- aid: flexyield-io:flexyield-io-data-api
  name: flexyield-io Data API
  description: The Data API from flexyield-io — 2 operation(s) for data.
  humanURL: https://flexyield.io/docs
  baseURL: https://flexyield.io
  tags:
  - Data
  properties:
  - type: OpenAPI
    url: openapi/flexyield-io-data-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-request-schema.json
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-response-schema.json
- aid: flexyield-io:flexyield-io-keys-api
  name: flexyield-io Keys API
  description: The Keys API from flexyield-io — 3 operation(s) for keys.
  humanURL: https://flexyield.io/docs
  baseURL: https://flexyield.io
  tags:
  - Keys
  properties:
  - type: OpenAPI
    url: openapi/flexyield-io-keys-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-request-schema.json
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-response-schema.json
- aid: flexyield-io:flexyield-io-rpc-api
  name: flexyield-io Rpc API
  description: The Rpc API from flexyield-io — 1 operation(s) for rpc.
  humanURL: https://flexyield.io/docs
  baseURL: https://flexyield.io
  tags:
  - Rpc
  properties:
  - type: OpenAPI
    url: openapi/flexyield-io-rpc-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-request-schema.json
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-response-schema.json
- aid: flexyield-io:flexyield-io-statements-api
  name: flexyield-io Statements API
  description: The Statements API from flexyield-io — 2 operation(s) for statements.
  humanURL: https://flexyield.io/docs
  baseURL: https://flexyield.io
  tags:
  - Statements
  properties:
  - type: OpenAPI
    url: openapi/flexyield-io-statements-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-request-schema.json
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-response-schema.json
- aid: flexyield-io:flexyield-io-toolbox-api
  name: flexyield-io Toolbox API
  description: The Toolbox API from flexyield-io — 7 operation(s) for toolbox.
  humanURL: https://flexyield.io/docs
  baseURL: https://flexyield.io
  tags:
  - Toolbox
  properties:
  - type: OpenAPI
    url: openapi/flexyield-io-toolbox-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-request-schema.json
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-response-schema.json
- aid: flexyield-io:flexyield-io-x402-api
  name: flexyield-io X402 API
  description: The X402 API from flexyield-io — 2 operation(s) for x402.
  humanURL: https://flexyield.io/docs
  baseURL: https://flexyield.io
  tags:
  - X402
  properties:
  - type: OpenAPI
    url: openapi/flexyield-io-x402-api-openapi.yml
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-request-schema.json
  - type: JSONSchema
    url: json-schema/flexyield-io-json-rpc-response-schema.json
x-enrichment:
  date: '2026-10-30'
  status: enriched
  artifacts_added: 32
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

flexyield-io API — frequently asked questions

Does flexyield-io have an API?

Yes. APIs.io lists 7 APIs from flexyield-io, including flexyield-io Agents API, flexyield-io Data API and flexyield-io Keys API, and 4 more.

Is there an OpenAPI specification for the flexyield-io API?

Yes. APIs.io indexes 7 OpenAPI specifications for flexyield-io, each linked for download from this page.

How do I authenticate with the flexyield-io API?

flexyield-io uses bearer-token authentication (apiKey/http · 2 schemes). The details are profiled on APIs.io as Flexyield Io Authentication.

How much does the flexyield-io API cost?

APIs.io lists 6 pricing plans for flexyield-io, with each plan's price, limits and inclusions under Pricing Plans on this page.

Does flexyield-io have an MCP server?

Yes. APIs.io lists 1 MCP server for flexyield-io: Remote MCP server at flexyield.io.

Is the flexyield-io API ready for AI agents?

flexyield-io has a Kin Score of 61.3 out of 100 (strong) and an Agent Readiness score of 36.5 (agent-ready), scored by API Evangelist on 2026-10-31.

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