AgentData API primary sources — 2026-05-03

Project status in this pass

• No canonical standalone AgentData API whitepaper or litepaper surfaced.
• The clearest current source of truth is the homepage plus the service’s machine-readable discovery documents: /discovery, openapi.json, llms.txt, and agent.json.
• The project is best understood as an x402-paid crypto market-data control plane for AI agents rather than as a normal subscription API.

Primary-source snapshots

1) Official homepage

• URL: https://agentdata-api.com/
• Key excerpt:
  • The homepage says AgentData API is a pay-per-request crypto market-data service built specifically for AI agents.
  • It explains the x402 flow using HTTP 402 Payment Required and ERC-3009-style USDC authorization on Base Mainnet.
  • It lists 16 production endpoints across market data, on-chain analytics, arbitrage, technical indicators, sentiment, stablecoin health, and historical data.

2) x402 discovery manifest

• URL: https://agentdata-api.com/discovery
• Key excerpt:
  • The manifest says the service uses x402 version 2 on eip155:8453 and accepts exact-scheme USDC payments on Base.
  • It publishes resource-level metadata including per-endpoint max price, payment recipient, output schema, MIME type, and method/query details.
  • This is one of the clearest signs that the product is built for machine discovery and payment-native invocation.

3) OpenAPI specification

• URL: https://agentdata-api.com/openapi.json
• Key excerpt:
  • The OpenAPI spec describes the paid endpoints and repeats x402-specific metadata such as x-x402-price and x-x402-network.
  • It shows low-ticket request pricing ranging from $0.001to$0.005 USDC.
  • It also exposes slightly more endpoint breadth than the homepage copy alone, including a funding-predictions route.

4) llms.txt

• URL: https://agentdata-api.com/llms.txt
• Key excerpt:
  • The file describes AgentData as real-time crypto market data for AI agents and lists the free and paid endpoints.
  • It spells out the exact payment flow: request, receive 402, decode payment requirements, sign USDC authorization, resend with signature, and receive the data.
  • It also explicitly identifies the service as self-hosted and enumerates upstream data sources such as public exchange APIs, RPC endpoints, and DefiLlama.

5) Agent card

• URL: https://agentdata-api.com/agent.json
• Key excerpt:
  • The card describes the service as real-time crypto market data for AI agents, authenticated via x402.
  • It exposes named skills like prices, funding rates, market overview, volatility, liquidation levels, and correlation.
  • This is useful evidence that the product is being packaged for emerging agent-runtime interoperability rather than only direct HTTP consumers.

Working conclusion

AgentData API is best cataloged as an x402-paid crypto market-data and analytics control plane for AI agents. The deciding evidence in this pass was the combination of self-hosted x402 settlement, low-cost per-request endpoint pricing, rich machine-readable discovery surfaces, and explicit AI-agent-first positioning across the homepage, discovery manifest, OpenAPI spec, llms.txt, and agent card.