x402 Services
| Rank | Service | Category | Chains | Volume · 30d | Transactions · 30d | Buyers |
|---|---|---|---|---|---|---|
| — | Open Scholarly Evidence foundry-open-scholarly-evidence-mainnet.inference-chip-index.workers.dev Bounded cross-source open DOI metadata evidence. Not peer review, identity, authorship, originality, quality, legal validity, or fraud detection. | Data | Base | $0.00 | 0 | 0 |
| — | Open Source Vulnerability Check dependency-risk.use.x402atlas.com !x402 Atlas | Chain infra | Base | $0.00 | 0 | 0 |
| — | OpenAI o3-mini mm.family gpt-6.1-sol (OpenAI's newest model) and 25 more OpenAI chat models (gpt-6, gpt-5.x, gpt-4.1, gpt-4o, o-series), paid per call in USDC. OpenAI token rates on… | AI | Base, Solana | $0.2113 | 150 | 7 |
| — | openapi.aisa.one aisa.one This service exposes an API at openapi.aisa.one. | Other | Base | $0.00 | 0 | 0 |
| — | StableNinja openwebninja-x402.vercel.app x402 access to selected OpenWebNinja APIs not already covered by existing Stables. | Gaming | Base | $0.00 | 0 | 0 |
| — | PARADIGMA Crypto Feed opportunity-api-production.up.railway.app Pay-per-call crypto data for AI agents via x402 (USDC on Base). Endpoints return 402 with PAYMENT-REQUIRED header; pay via x402 client and retry. | Data | Base | $0.025 | 4 | 3 |
| — | Ops Control HQ npm Health tkoqkknsezxavtxfywkm.supabase.co Current npm package health and dependency-risk snapshot | Utility | Base | $0.056 | 6 | 4 |
| — | OptionsFlow options.lonestaroracle.xyz Options flow, implied-volatility skew and put/call ratio signal for US stocks and crypto (BTC/ETH/SOL). Pass ?ticker=. | Chain infra | Base, Solana | $0.00 | 0 | 0 |
| — | OPX opx-status.dev infrastructure for machine-to-machine commerce | AI | Base | $0.006 | 3 | 2 |
| — | oracle-network-agent-meta.fly.dev oracle-network-agent-meta.fly.dev An AI service hosted at oracle-network-agent-meta.fly.dev. | AI | Base, Solana | $0.00 | 0 | 0 |
| — | oracle-network-jp-data.fly.dev oracle-network-jp-data.fly.dev Provides access to data through an API. | Data | Base, Solana | $0.00 | 0 | 0 |
| — | oracle-network-niche-sports.fly.dev oracle-network-niche-sports.fly.dev Provides niche sports data through an API. | Data | Base, Solana | $0.00 | 0 | 0 |
| — | oracle-network-onchain-signal.fly.dev oracle-network-onchain-signal.fly.dev Provides on-chain signal data from an oracle network. | Data | Base, Solana | $0.00 | 0 | 0 |
| — | oraclepost.higgsfield.app oraclepost.higgsfield.app Live Base blockchain reads and crypto utilities for blocks, token metadata, transaction status, prices, ENS names, encoding, and hashing. | Data | Base | $0.426 | 46 | 8 |
| — | orchard-data orchard-data.netlify.app Market data for AI agents, paid per-call via x402 (USDC on Base). Free index at /, free spec here. | Data | Base | $0.00 | 0 | 0 |
| — | orderbook-depth orderbook-depth.api.klymax402.com Uniswap V3 liquidity depth analysis -- price impact at 1/2/5/10% levels. Slippage estimation pre-trade. | Data | Base | $0.00 | 0 | 0 |
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