Laso Finance Developers
Laso Finance lets AI agents and applications pay in the real world with USDC: prepaid cards, gift cards, push-to-card, Venmo and PayPal payouts, and bank payments. Everything is available through the Laso Finance x402 API at https://laso.finance and the same surface as MCP tools. Guides live at docs.laso.finance.
Laso Finance API reference
- API reference: Every route of the Laso Finance x402 payment API, with parameters, responses, and prices.
- OpenAPI 3.1 specification: The machine-readable contract for the whole API. The MCP tools are generated from it.
- API pricing: Per-route fees, with no subscription or monthly minimum.
Laso Finance authentication
- Authentication guide: API keys, id tokens, token refresh, and the signup-for-a-human flow.
- auth.md: How an agent discovers, registers for, exchanges, uses, and refreshes credentials.
- OAuth protected resource metadata: RFC 9728 discovery record for the API.
Laso Finance MCP server
- MCP server guide: Connect to https://laso.finance/mcp over streamable HTTP with a bearer credential.
- MCP server card: Endpoint, auth, and the full tool list.
- WebMCP: In-page tools for agents driving a signed-in browser session.
Get started
- Agent quick start: A first working call in a few minutes.
- Agent skill (SKILL.md): Setup and the end-to-end call recipe for every product.
- How x402 works: The 402 challenge, the payment header, and settlement on Base and Solana.
- Webhooks: Signed notifications instead of polling.
- Error handling: Refusals, failed settlement, identity verification gates, and retries.
Framework integrations
Machine-readable discovery
- llms.txt: Index of every Laso Finance developer resource.
- llms-full.txt: The full reference in one document.
- API catalog: RFC 9727 linkset for the API and the MCP server.
- AI plugin manifest: Plugin descriptor pointing at the OpenAPI contract.
- Docs version: Content hash of the agent docs, for cache freshness checks.