PageDelta is the one featured paid API. It renders a public page, returns bounded evidence, and compares a later payer-scoped observation for $0.01 per call. A buyer can inspect its live 402 challenge before choosing a configured stablecoin rail. The full gateway OpenAPI reference below also documents 39 older callable routes for compatibility. Those older routes are not part of the public Bazaar offer.
The fastest way to inspect the offer is the PageDelta challenge playground. Pick a candidate rail and read a real unpaid 402. No wallet or payment is required for inspection. The illustrated response is not a paid result.
The PageDelta-capable @bitbooth/mcp-fetch@2.3.1 buyer remains public on npm and clean-install verified. Its official MCP Registry entry, io.github.Drock91/bitbooth-fetch version 2.3.1, is active with isLatest: true (published 2026-09-12T02:45:49.479212Z). Copy the exact-version npx -y @bitbooth/mcp-fetch@2.3.1 MCP configuration. Credential-free installs expose only free discovery and preflight; page_delta stays hidden until the operator explicitly selects XRPL RLUSD, supplies a dedicated wallet, and sets per-call and daily caps. The HTTP discovery flow is also available in any language.
Three JSON surfaces expose the featured PageDelta offer without scraping: /bazaar.json, its well-known x402 mirror, and the agent capability manifest.
Agent calls a paid endpoint with no payment. Gateway returns HTTP 402 plus the base64 PAYMENT-REQUIRED header and multi-chain accepts[] array. The agent picks one entry, creates its request-bound signed proof (EIP-3009 on Base, a signed SVM transaction on Solana, a signed XRPL transaction, or a Stellar envelope), and retries with PAYMENT-SIGNATURE. The gateway verifies, settles through the right path, runs the handler, and returns the response with PAYMENT-RESPONSE. X-PAYMENT is a compatibility alias, not the canonical v2 name.
Base mainnet (USDC), Solana mainnet (USDC), XRPL native (RLUSD and Circle USDC IOU), and Stellar pubnet (Circle USDC). Native XRP/XLM are disabled until an expiry-bound FX quote derives a value-correct amount; transaction-hash-only LINK and XRPL EVM rails are also disabled. See the Networks section for facilitator and issuer attribution.
The full Swagger UI below includes the featured PageDelta route and 39 callable compatibility paths. Use Try it out carefully: it sends a real HTTP request, although an unpaid valid call returns a 402 without spending. The public one-API contract is at /openapi.json; the full reference is at /openapi.yaml.