SiftingIO
Cross-asset market data APIs covering US equities, forex, cryptocurrency, DeFi/on-chain, commodities, and SEC/EDGAR fundamentals, aggregated across venues and normalized into one JSON schema so every asset class shares the same fields, auth model and integration flow. Delivered over REST (37 operations under a public OpenAPI 3.1 contract), a WebSocket stream described by a public AsyncAPI 3.0 contract, and a documented FIX 4.4 market-data feed. Fundamentals cover filings, filing-text extraction and risk-factor diffs, XBRL financials, ratios, insiders, ownership and 13F holdings; reference data covers market status, hours and holiday calendars; derived data covers technical signals and on-chain TVL. Official Go, Python and JavaScript SDKs, an open-source (locally-run) MCP server with 36 tools, and a provider-published agent ruleset. Operated by SaltingIO LLC, a Wyoming company; explicitly not a broker, exchange or trading venue.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles SiftingIO the way a machine reads it — 21 machine-readable artifacts across 13 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — SiftingIO scores 64.7/100 (strong), with a separate agent-readiness read of 68/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-08-17 · rubric v0.11.0
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How we profile SiftingIO
Each block below is one kind of artifact we hold for SiftingIO. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 13
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
SiftingIO Live Stream
WebSocket streaming API for live market data, described by an AsyncAPI 3.0 contract. Also offers a documented FIX API.
SiftingIO MCP Server
LOCALLY-RUN MCP server, not a hosted endpoint. The client launches it (`npx -y siftingio-mcp`, or the Python package) and it runs on the user's own machine, reading the key from...
SiftingIO Commodities API
Historical OHLC bars for commodities (metals, energy, industrials).
SiftingIO Convert API
Live currency and token conversion across forex and crypto.
SiftingIO Crypto API
Historical OHLCV bars for crypto symbols.
SiftingIO DEX API
On-chain wallet portfolios and historical DEX bars.
SiftingIO Economic Calendar API
US macro economic events.
SiftingIO Filers API
13F institutional holdings.
SiftingIO Forex API
Historical OHLC bars for FX pairs.
SiftingIO Live API
Live market data read from the engine's latest snapshot.
SiftingIO Markets API
Market catalog, status, hours, and holiday calendars.
SiftingIO Signals API
Technical-analysis signals (live and historical) across stocks, forex, crypto, and commodities.
SiftingIO Stocks API
US-equity fundamentals (SEC) and historical bars.
Scroll within the panel for all 13 ·
MCP Servers 2
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
mcp
MCP SERVERsiftingio-mcp.yml
MCP SERVERPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Siftingio Rate Limits
RATE LIMITSEvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
SiftingIO Live Stream
WebSocket API for live market data. Connect to `wss://stream.sifting.io/ws/v1?key=sft_...` — the API key is passed as the `key` query parameter (the only WebSocket auth method)....
ASYNCAPISecurity Posture 2
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for SiftingIO — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 5
Portal, sign-up, and the first successful call
Documentation 4
Reference material describing how the API behaves
Agent Surfaces 4
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 6
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 7
Status, limits, changes, and where to get help
Scroll within the panel for all 7 ·
Commercial 4
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 11
Properties that don't map to a standard resource type
Scroll within the panel for all 11 ·
← All providers · Data indexed from github.com/api-evangelist/siftingio · machine-readable index on apis.io
This is an independent, third-party profile of SiftingIO, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.