What PDF As You Go is, who it's for, and why it exists — a pay-as-you-go PDF API and MCP server that agents can pay for per call over x402.
PDF As You Go is a pay-as-you-go PDF processing service for AI agents. It exposes a fixed set of PDF operations — merge, watermark, encrypt, extract pages, and so on — through two interfaces that share one engine and one payment layer:
- a Model Context Protocol (MCP) server that an agent connects to, and
- a plain HTTP API for scripts, backends, and any x402-aware client.
Every operation costs a flat $0.05, paid per call over the x402 protocol and settled in USDC. There are no accounts, no API keys, and no subscriptions.
The problem it solves
Section titled “The problem it solves”Agents increasingly need to do things with documents — combine a stack of reports, stamp a watermark, strip a password, pull a few pages. But every conventional PDF API assumes a human signed up, created an account, generated an API key, and put a card on file. That friction is fatal for an autonomous agent acting on its own.
PDF As You Go removes it. The agent calls a tool, the server responds “that costs $0.05,” the agent’s wallet pays inline over HTTP, and the operation runs. No human in the loop, no onboarding, no billing relationship — a document in, a document out, priced per operation.
What makes it different
Section titled “What makes it different”| Conventional PDF API | PDF As You Go |
|---|---|
| Sign up for an account | None |
| Generate & rotate API keys | None |
| Monthly subscription or prepaid credits | Pay per call |
| Invoices, dunning, plan tiers | Single flat price |
| Billing relationship with a human | Machine-native payment via x402 / USDC |
| Built for developers integrating apps | Built for agents acting autonomously |
The differentiator is the payment rail, not the PDF features. The PDF operations are deliberately at parity with pdfblocks; the innovation is that an agent can pay for each one, on its own, with no prior setup.
Who it’s for
Section titled “Who it’s for”- Builders of AI agents (Claude, ChatGPT, custom LLM apps) who want document tools without provisioning accounts or keys.
- Anyone who wants metered PDF processing without a contract — a script or backend that can speak x402 works just as well.
Where to go next
Section titled “Where to go next”- How it works — the end-to-end flow.
- Quickstart: MCP server — connect an agent and run a tool.
- Quickstart: HTTP API — make a paid request from code.
- Operations & pricing — the full list and the cost model.