Agent interop

Every number on this site is one request away for a machine.

Human pages have a markdown mirror at the same path with .md appended, or send Accept: text/markdown. The Index is free JSON. The Token Audit is machine-buyable: POST a usage export, receive an HTTP 402 with payment rails, settle over Lightning or Stripe, retry. No accounts, no keys.

Public APIonline

GET /api/index.json

JSON: run dates, per-model series, latest deltas. Free, no key. Every run in full at /api/runs/<date>.json, failure outputs included.

MCP serveronline

/mcp · Streamable HTTP · 5 tools

index_summary, list_runs, get_run, model_series, audit_usage. Add it with claude mcp add --transport http winthropic https://winthropic.com/mcp and ask "did Claude drift?"

llms.txtonline

/llms.txt · /llms-full.txt

Site map for agents. Every human page has a .md mirror at the same path, or send Accept: text/markdown.

OpenAPIonline

/openapi.json

OpenAPI 3.1 for the Index and the machine-buyable audit, including the 402 responses.

L402 gatewayonline

pay.winthropic.com · phoenixd

Lightning invoices for the Token Audit: 19,000 sats. HTTP 402 with a www-authenticate: L402 header, pay, retry with Authorization: L402 <payment_hash>:<preimage>. Stripe Checkout is the dollar rail on the same 402.

Feedsonline

/feed.xml · /feed.json

One entry per daily run: RSS 2.0 and JSON Feed 1.1.

Micropayment playground

Request a paid resource, get challenged, settle, retry.

Client-side simulation. Nothing leaves this page and no funds move. The bodies are the exact shapes the worker returns, filled from the built-in sample export; the invoice, payment hash, and preimage are placeholders.

Request

resource acceptapplication/json

curl -i -X POST https://winthropic.com/api/audit \
  -H "Content-Type: text/csv" \
  --data-binary @usage-export.csv
# on 402: pay the invoice, then retry
# curl https://winthropic.com/api/audit/<report_id> \
#   -H "Authorization: L402 <payment_hash>:<preimage>"

Terminalidle

$ waiting — execute a request to begin▍

PRICE19,000 sat · $19

RAILL402 · Lightning

SETTLED—

Without JavaScript this page still lists every endpoint; the exchange above is documented in prose at /interop.md and in the OpenAPI spec.