130 pay-per-call APIs an autonomous trading agent can discover, pay for, and use in one request — Solana sniping, perps & funding, multichain token safety, compliance, options, DeFi, and more. No accounts, no API keys, no subscriptions. Pay per request in any major stablecoin — USDC on Base, Polygon, Arbitrum, or Solana, or USDG on Robinhood Chain via the x402 protocol — or connect over MCP.
Two front doors to the same tools. Payment is identical either way: any major stablecoin — USDC on Base, Polygon, Arbitrum, or Solana — or USDG on Robinhood Chain via x402.
Point any MCP-native client at the endpoint below and call tools/list to see every tool with schemas.
https://x402-services-production.up.railway.app/mcp
Registry: ai.firmbrain/x402-services
POST to any endpoint. The first response is HTTP 402 with payment terms; pay in USDC on Base, Polygon, Arbitrum, or Solana — or USDG on Robinhood Chain and retry with the X-PAYMENT header.
https://x402-services-production.up.railway.app/api/catalog
Discoverable on the x402 Bazaar.
130 endpoints across 16 verticals. A representative slice:
Fresh pump.fun launches with age & market cap, coins about to graduate to Raydium, and authoritative rugcheck safety (authorities renounced?, LP locked, holder concentration) before you ape.
Funding rates and cross-venue funding arbitrage across Hyperliquid, Lighter, Binance & Bybit; perp-vs-spot basis, open interest, and funding extremes.
Multichain new-pair detection, honeypot/rug checks, holder concentration, copy-trade wallet tracking, and price-impact sizing.
"Is it safe to sign this?" — decode calldata, flag drainers & unlimited approvals, screen sanctioned counterparties, and simulate exact balance changes before signing.
OFAC sanctions screening, address risk scoring, entity labels, and multi-hop tainted-funds tracing.
Black-Scholes greeks for any option, live Deribit chain, max-pain, and implied-vol term structure.
Live Polymarket odds, arbitrage scanner, trending markets, and the crypto Fear & Greed index.
Aave health factors, best supply rates across protocols, and a live liquidation-opportunity scanner.
Multi-chain net worth, 24h PnL, concentration risk, and a FIFO realized-gains estimate.
Best-route swap quotes, slippage guidance, sandwich-risk scoring, and multi-chain gas.
Onchain-token dislocation vs the real equity, 24/7 gap radar, liquidity/depth, Chainlink oracle-deviation, and earnings & dividend catalysts.
A portable wallet reputation / trust score, and an agent-to-agent conditional-payment escrow.
/llms.txt.HTTP 402 with payment requirements.X-PAYMENT header — you get the data. No signup, no key.Everything is metered per-request, so an agent pays only for exactly what it calls.