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Paid APIs an AI agent can call with x402. Burnbound checks each one every 6 hours without paying: it must answer a valid x402 challenge, on the host listed here, in USDC on Base or Base Sepolia. Prices are per call.
11 APIs · No paid placements: the list is alphabetical. A listing never lets an agent pay an API; its policy decides.
Semantic web search built for agents.
Search · Base · fixed
Search across Twitter/X and other social sources.
Social data · Base · fixed
ENS name resolution.
Identity · Base · fixed
Prepaid cards and payments for agents.
Commerce · Base · fixed
Prediction market data.
Market data · Base · fixed
Block, balance and token data over RPC.
On-chain data · Base · fixed
Postgres databases and backend services paid with x402.
Infrastructure · Base, Base Sepolia (testnet) · fixed
People and company enrichment (Exa, FullEnrich and other sources).
Data enrichment · Base · fixed
Flight and award seat search.
Travel · Base · fixed
File uploads with a temporary link.
Storage · Base · fixed
Web and news search.
Search · Base · fixed