How AI agents find and purchase paid APIs
Discover paid APIs through OpenAPI, x402 discovery manifests and remote MCP tools, then evaluate transparent cost before approving payment.
Discover services without guessing URLs
Universal Data publishes an OpenAPI contract, x402 v2 resources with USDC payment terms, a remote MCP directory and a free software catalog. Each lists what the tool actually delivers, not promises about automated success.
Compare one task against actual capabilities
Use free task-based matching or read the input schema. A marketplace integration may require customer OAuth. Some analytical and finance endpoints take customer-supplied values rather than live quotes; do not treat all services as real-time data feeds.
Authorize one payment, then run
Inspect the 402 challenge and ask the owner to approve the specific recipient and maximum spend. An MCP tool calling an existing API does not incur an additional MCP charge. SDK and third-party provider fees are customer-funded.
Start with payment setup
See the four x402 + MPP integration products for an example of machine-readable price, suitable use case, delivered files and post-purchase commands.
Machine-readable reference: llms.txt · OpenAPI · x402 manifest