x402 Services
| Rank | Service | Category | Chains | Volume · 30d | Transactions · 30d | Buyers |
|---|---|---|---|---|---|---|
| — | Observer x402 Evidence Service observer.137-184-67-179.sslip.io Experimental machine-readable market-structure evidence service protected by x402 payments. Active payment network: Base mainnet. Experimental analytics only… | AI | Base | $0.12 | 12 | 7 |
| — | oc-person-c.nvprotas.name nvprotas.name Provides a paid HTTP hello endpoint. | Other | Base | $0.006 | 6 | 7 |
| — | OceanAlt oceanalt.com compliance layer for agent payments | AI | Base, Solana | $0.094 | 7 | 3 |
| — | offercheck offercheck.offercheck.workers.dev Pay-per-call web and market-data tools for AI agents (x402, USDC on Base, no signup). Read any public page as clean Markdown with metadata and links; verify a… | AI | Base | $0.062 | 8 | 6 |
| — | Omniguchi API omniguchi.0000402.xyz Wallet-bound virtual creatures for humans and agents. Public reads are free; state-changing actions settle directly to the service wallet through x402 on Base. | Chain infra | Base | $0.00 | 0 | 0 |
| — | Onchain Query API chain.cyberwarex.com Pay-per-call EVM chain data for agents: wallet snapshots, ERC-20 token profiles, spot prices, gas markets, transaction decode, and ENS resolution across major… | Search | Base | $0.00 | 0 | 0 |
| — | OpenPay Discovery, Directory and Shops APIs open-pay.jp Payable x402 resources, structured Japan Web3 directory data, and opt-in JPYC shop discovery. | Data | Base | $0.00 | 0 | 0 |
| — | Open Research Agent Hosted open-research-agent.com Hosted research agent that generates standard and deep research reports. | AI | Base | $0.90 | 5 | 4 |
| — | 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 |
| — | 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 |
| — | orionkr orionkr.xyz Chain infrastructure APIs for Robinhood Chain routing, Base swap safety, x402 agent commerce, and trade policy evaluation. | Chain infra | Base | $0.00 | 0 | 0 |
| — | Orizn Visa API orizn.app Visa requirements, fees, embassies, transit rules and 26 more data points for every passport / destination pair in the world — in 15 languages. | Data | Base | $0.03 | 1 | 1 |
| — | OutcomeScout outcomescout.vercel.app Paid x402 endpoint that maps a news headline to top tradeable Polymarket prediction markets. | AI | Base | $0.01 | 1 | 3 |
| — | OyaPicks Prediction Market Data oyapicks.app Pay-per-request prediction market data for AI agents. Normalized live markets from Polymarket and Alpha Arcade: prices, volume, movers, arbitrage gaps… | Search | Base | $0.59 | 15 | 4 |
| — | Ozmium Agent API ozmium.org Do what a human does in the Ozmium app- from your agent's OWN wallet, for two cents a call. Skip browser automation and vision tokens: read and sign real Base… | AI | Base | $0.00 | 0 | 0 |
| — | PCH II Inference & Data Gateway pathcoursehealth.com Pay-per-call AI inference and data. Each endpoint returns HTTP 402 with x402 payment terms until an X-PAYMENT header carrying a signed EIP-3009 USDC… | AI | Base | $0.00 | 0 | 0 |
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