AgentData API

• Name: AgentData API
• URL: https://agentdata-api.com/
• Category: x402 market-data seller / Base service
• Tags: ethereum-ecosystem
• Summary: AgentData API is a small x402 data seller on Base. The analytics are not the point. Keep the note for the packaging: machine-readable discovery, route-level pricing, and a self-hosted facilitator behind a live paid-request surface.
• What it does:
  • Exposes paid crypto market-data endpoints for prices, funding rates, volatility, liquidation levels, correlations, Base activity, DeFi yields, arbitrage spreads, sentiment, stablecoin health, and historical OHLCV data
  • Uses x402 v2 with HTTP 402 Payment Required and ERC-3009-style USDC payment authorization on Base Mainnet, with a self-hosted facilitator rather than an external broker
  • Publishes several machine-readable discovery surfaces including /discovery, openapi.json, llms.txt, and agent.json
  • Offers a small free tier of preview endpoints so agents or operators can test data quality before paying for premium routes
  • Packages crypto-native analytics for autonomous clients instead of requiring signup, keys, or enterprise contracts
• Key claims:
  • The homepage says AgentData API is a pay-per-request crypto market-data service built for AI agents and explicitly contrasts that with account-and-key-based API products
  • The same materials say the service is live on Base Mainnet, implements x402, and covers 16 production endpoints across prices, funding, volatility, arbitrage, sentiment, stablecoin checks, and historical data
  • The discovery manifest publishes x402 v2 payment details, Base network identifiers, recipient address data, per-resource schemas, and maximum payment amounts, which is exactly the sort of machine-readable packaging an autonomous buyer needs
  • The OpenAPI spec repeats route-level x402 pricing, with low-dollar USDC request prices that reinforce the product as metered request access rather than subscription software
  • The llms.txt and agent.json files show the team is optimizing for agent discovery and retry behavior, not just for human developers reading static docs
  • The docs note a self-hosted facilitator, which makes AgentData a useful contrast with more brokered x402 deployments
• Whitepaper: No canonical standalone AgentData API whitepaper or litepaper surfaced in this pass. The clearest current source of truth was the official site plus the service’s machine-readable discovery surfaces; see ../whitepapers/agentdata-api-primary-sources-2026-05-03.md.
• Sources:
  • https://agentdata-api.com/
  • https://agentdata-api.com/discovery
  • https://agentdata-api.com/openapi.json
  • https://agentdata-api.com/llms.txt
  • https://agentdata-api.com/agent.json

Internal linkages

• Protocol base: x402
• Stronger discovery reference: 402-index

Control surface

• The operator controls which data routes exist, how the discovery surfaces describe them, what stays free versus paid, and how much reliability sits behind the self-hosted facilitator.

• That matters, but it is still seller packaging riding on x402 rather than a new payments primitive.

• Keep the note pointed upward toward x402 and stronger paid-service discovery anchors.

• Last reviewed: 2026-06-04 UTC