APIbase.pro — The API Hub for AI Agents

Search flights, compare prices, track status, trade prediction markets — all via MCP. One endpoint. 33 tools. 5 providers. Pay per call.

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What is APIbase?

APIbase is a production MCP server that gives AI agents instant access to real-world APIs — flight search, prediction markets, DeFi trading, and more. No SDK installation, no API key juggling, no rate limit management. Connect once, use 33 tools.

Built for AI agents, not humans. Every tool is designed for autonomous discovery, authentication, and invocation via the Model Context Protocol.

Why agents use APIbase

One MCP endpoint — https://apibase.pro/mcp connects to 5 providers
Real-time flight search — Amadeus + Sabre GDS, 500+ airlines, real prices
Pay per call — x402 micropayments (USDC), no subscriptions, no minimums
Auto-registration — agents get API keys instantly, zero human setup
Production-grade — 13-stage pipeline, escrow payments, idempotent operations

Quick Start (30 seconds)

For Claude Desktop / Cursor / Windsurf

Option A — Direct connection (Streamable HTTP):

{
  "mcpServers": {
    "apibase": {
      "url": "https://apibase.pro/mcp"
    }
  }
}

Option B — Via npm package (stdio bridge):

{
  "mcpServers": {
    "apibase": {
      "command": "npx",
      "args": ["-y", "apibase-mcp-client"]
    }
  }
}

For any MCP-compatible agent

MCP Endpoint:   https://apibase.pro/mcp
Tool Catalog:   https://apibase.pro/api/v1/tools
Discovery:      https://apibase.pro/.well-known/mcp.json

Register and get your API key

POST /api/v1/agents/register
Content-Type: application/json

{"agent_name": "my-agent", "agent_version": "1.0.0"}

Returns api_key (ak_live_...) and agent_id. Store the key securely — it is shown once.

Call tools via MCP

Connect to https://apibase.pro/mcp using the MCP protocol (Streamable HTTP transport). Authenticate with Authorization: Bearer ak_live_....

All tool calls follow the MCP tools/call method.

Call tools via REST

GET /api/v1/tools/{tool_id}?param1=value1¶m2=value2
Authorization: Bearer ak_live_...
Accept: application/json

Flight Search Example

Ask your AI agent:

"Find the cheapest flights from New York to London next week"

The agent calls amadeus.flight_search and gets real-time prices from 500+ airlines:

{
  "origin": "JFK",
  "destination": "LHR",
  "departure_date": "2026-03-20",
  "adults": 1,
  "travel_class": "ECONOMY",
  "max_results": 5,
  "currency": "USD"
}

Returns itineraries with prices, airlines, stops, duration, baggage info — ready for the agent to compare and present.

Available Tools (33)

Amadeus — Flight Search & Travel Data (7 tools)

Real-time flight data from the world's largest GDS. Search flights across 500+ airlines, check live status, find airports.

Tool	Description	Price
`amadeus.flight_search`	Real-time flight offers with prices, airlines, stops, duration	$0.035
`amadeus.flight_price`	Confirm final pricing for a flight offer	$0.020
`amadeus.flight_status`	Real-time flight status — delays, cancellations, gates	$0.005
`amadeus.airport_search`	Airport/city search by keyword or IATA code	$0.003
`amadeus.airport_nearest`	Nearest airports by geographic coordinates	$0.003
`amadeus.airport_routes`	All direct destinations from an airport	$0.003
`amadeus.airline_lookup`	Airline details by IATA or ICAO code	$0.002

Sabre GDS — Flight Search & Travel Data (4 tools)

Alternative flight search via Sabre Global Distribution System. Cross-reference prices with Amadeus for best deals.

Tool	Description	Price
`sabre.search_flights`	Real-time flight offers with prices between airports	$0.010
`sabre.destination_finder`	Cheapest flight destinations from an origin airport	$0.005
`sabre.airline_lookup`	Airline details by IATA or ICAO code	$0.002
`sabre.travel_themes`	Travel theme categories (beach, skiing, romantic, etc.)	$0.002

Polymarket — Prediction Markets (11 tools)

Search, analyze, and trade on prediction markets. Real-time odds, order books, and trading via CLOB.

Tool	Description	Price
`polymarket.search`	Search prediction markets	$0.0005
`polymarket.market_detail`	Market details with probabilities	$0.0005
`polymarket.prices`	Midpoint price for a token	$0.0005
`polymarket.price_history`	Historical price data	$0.0005
`polymarket.get_orderbook`	Order book depth	$0.0005
`polymarket.trending`	Trending markets by volume	$0.0005
`polymarket.place_order`	Place a limit order (GTC/GTD/FOK)	$0.001
`polymarket.cancel_order`	Cancel an open order	$0.001
`polymarket.open_orders`	Get open orders	$0.0005
`polymarket.trade_history`	Trade history	$0.0005
`polymarket.balance`	Balance and allowance	$0.0005

Hyperliquid — DeFi Perpetuals (6 tools)

On-chain perpetual futures exchange. Market data, order books, positions, and account info.

Tool	Description	Price
`hyperliquid.market_data`	Market data and funding rates	$0.002
`hyperliquid.order_book`	Order book depth	$0.003
`hyperliquid.klines`	Candlestick / OHLCV data	$0.003
`hyperliquid.positions`	User positions	$0.005
`hyperliquid.account`	Account summary	$0.005
`hyperliquid.vault`	Vault details	$0.005

AsterDEX — DeFi Perpetuals (4 tools)

Decentralized perpetual exchange on Asterism. Market data, order books, and candlestick charts.

Tool	Description	Price
`aster.exchange_info`	Exchange info and trading pairs	$0.001
`aster.market_data`	Market data and 24h stats	$0.002
`aster.order_book`	Order book depth	$0.003
`aster.klines`	Candlestick / OHLCV data	$0.003

Payment

Field	Value
Protocol	x402 (HTTP 402 Payment Required)
Token	USDC on Base
Address	`0x50EbDa9dA5dC19c302Ca059d7B9E06e264936480`

No subscriptions. No minimums. Pay only for what you use.

Authentication

Method	Header	Format
API Key	`Authorization`	`Bearer ak_live_<32hex>`
x402 Payment	`X-Payment`	Base64-encoded payment receipt

Response Format

All responses include:

X-Request-ID header for tracing
JSON body with tool-specific data field
Standard error codes on failure

Rate Limits

Per-agent, per-tool token bucket
Global tier limits: free (20 req/s), paid (100 req/s)
429 with Retry-After header on limit exceeded
Redis-backed, fail-closed

Error Codes

HTTP	Code	Meaning
400	`validation_error`	Invalid parameters
401	`unauthorized`	Missing or invalid API key
402	`payment_required`	x402 payment needed
404	`not_found`	Tool or resource not found
406	`not_acceptable`	Wrong Accept header (use `application/json`)
429	`rate_limited`	Rate limit exceeded
500	`internal_error`	Server error
502	`bad_gateway`	Provider unavailable
503	`service_unavailable`	System not ready

MCP Discovery

GET /.well-known/mcp.json

{
  "name": "APIbase",
  "protocol": "MCP",
  "version": "1.0",
  "mcp_endpoint": "https://apibase.pro/mcp",
  "authentication": "x402"
}

Architecture

13-stage pipeline: AUTH → IDEMPOTENCY → SCHEMA_VALIDATION → CACHE → RATE_LIMIT → ESCROW → PROVIDER_CALL → LEDGER → RESPONSE
Fail-closed: Redis down = reject all requests, no silent degradation
Idempotent: same request + same key = same result, no double charges
Observable: Prometheus metrics, Grafana dashboards, structured logging

Self-Hosting

git clone https://github.com/whiteknightonhorse/APIbase.git
cp .env.example .env    # configure secrets
docker compose -f docker-compose.yml -f docker-compose.prod.yml up -d

Requires: Docker, PostgreSQL 16, Redis 7.2, Node.js 20.

16 containers: API, Worker, Outbox, PostgreSQL, Redis, Nginx, Prometheus, Grafana, Loki, Promtail, Alertmanager, and exporters.

License

MIT

APIbase