FetchDelta is a paid HTTP API for AI agents that need fresh public web pages as clean markdown or structured diffs.

What pages should agents use FetchDelta for?

FetchDelta is best for public docs, release notes, changelogs, pricing pages, and policy pages that an agent needs to check before answering or acting.

FetchDelta Pricing

FetchDelta costs $0.002 per resolve request and $0.004 per diff request.

Q: How does payment work?

FetchDelta returns HTTP 402 payment requirements and accepts x402 payments over Base mainnet USDC for individual resolve or diff requests.

Use the free preview first. Pay only when an agent needs the current public page as clean markdown or needs a structured diff against the previous snapshot.

Try a free preview Open quickstart Markdown API x402 API OpenAPI JSON

How Much Does FetchDelta Cost?

$0.002 /api/resolve returns the current public page as clean markdown plus title, excerpt, final URL, and headings. About 500 resolve calls per $1.

$0.004 /api/diff compares the latest fetch with the previous stored snapshot and returns structured additions and removals. About 250 diff calls per $1.

What Is Included?

Free preview

Title, excerpt, headings, links, and a truncated markdown sample for a public URL before payment.

Paid resolve

Full normalized markdown for one public docs, release-note, changelog, pricing, or policy page.

Paid diff

Stored snapshot comparison for repeated checks when an agent only needs to know what changed.

When Should An Agent Use Resolve Versus Diff?

Use /api/resolve when the agent needs the full current page in markdown before it answers or acts.
Use /api/diff when the page is watched repeatedly and the agent only needs additions, removals, and a short preview.
Use the free preview endpoint when the agent needs to decide whether the page is worth a paid call.

How Does Payment Work?

Paid endpoints return HTTP 402 payment requirements and accept x402 payments over eip155:8453 with USDC settlement. There is no API key requirement for the public paid endpoints.

curl -i 'https://fetchdelta.com/api/resolve?url=https%3A%2F%2Fexample.com%2F'

curl -i 'https://fetchdelta.com/api/diff?url=https%3A%2F%2Fexample.com%2F'