Every paid API on Algorand, tested rather than listed.

ArbSignal — live cross-DEX arbitrage scanner for Algorand. Finds asset pairs priced differently across DEXes (Tinyman, Pact, HumbleSwap, Folks) and returns the profitable gaps, ranked by NET spread % (after both pools' swap fees). Each opportunity names the cheapest pool to BUY the base asset and the richest pool to SELL it, with pool IDs, protocols, prices, fees, and liquidity. Empty/outlier/dust pools are filtered out. Spreads are spot (pre-slippage) — check executable size before trading. Optional query ?minNet=<pct> sets the minimum net spread to report (default 0.5). Try it in the browser: https://arbsignal-landing.vercel.app

Signed point-in-time price attestation

OyaPicks: same outcome priced differently across Polymarket and Alpha Arcade (cross-venue gaps)

ALGO-USD market microstructure metrics from Coinbase trade data: VPIN (flow toxicity) and order-flow imbalance

Amarok unsigned execution quotes

Cursor-based delta poll over watched wallets and tokens. Change types: wallet_activity (tx count + largest transfer since cursor; algorand/ethereum/base), token_risk_change, token_liquidity_shift, token_holder_shift (~10-min granularity; all five chains). First poll establishes baselines. Empty deltas still ran the query

Withdrawal fees per exchange for a crypto asset, by network, ranked cheapest-first — plus the taker trading fee where known and a shortcut of which exchanges support ALGORAND-network withdrawals. Use to minimize the real cost of moving funds off an exchange

Machine-readable catalog of 50+ verified x402 services callable through this merchant — LLM inference, token security, market data — each with USDC price, Agents-Trust tier and liveness. Same payload is free at /catalog; this paid twin exists so the index itself is a discoverable x402 resource

Describe a task (or name a slug) and the Smart Order Router resolves the best-matching tool and RUNS it in the same call - flat $0.05 covering any tool listed at $0.04 or less, from THIS host's catalog or any external x402 seller in the open index

A cryptographically-signed, on-chain-anchored Peter Lynch decision proof for a stock (?symbol=AAPL)