Rank #3 · x402 · fixture

Header-Only x402 Fixture

Deterministic fixture where payment requirements are header-readable but less complete in the response body.

Agent decision Excellent

Payment test mode Unpaid challenge only

Evidence source fixture reports

93/100 benchmark score

excellent grade

2 report rows

0 paid settlements

Endpoint Surface

Request

POST https://header-only.example/api/paid

Price

0.01 USDC

Rail

exact / base

Uptime 20/20

Availability is estimated from benchmark fixture observations; no paid retry is made.

X402 Payment Correctness 25/25

Payment correctness checks the unpaid challenge shape and declared x402 requirements, not settlement.

Schema Quality 13/15

Schema quality rewards crawler-readable manifests, OpenAPI coverage, and catalog metadata.

Price Clarity 15/15

Price clarity rewards machine-parseable atomic pricing and a human-readable USDC display value.

Network Asset Clarity 10/10

Network and asset clarity checks whether agents can choose the correct chain and token before signing.

Report History 10/15

Report history rewards signed evidence, repeat observations, and fresh readiness reports.

Payment header signed

False

Facilitator settle called

False

Spends money

False

Source: fixture_reports. Matching: target_url exact, then normalized origin.

Report	Source	Grade	Score	Verified	Integrity
`fixture_header_only_20260519`	fixture report	ready	92/100	2026-05-19T00:00:00Z	True
`fixture_header_only_20260518`	fixture report	ready	90/100	2026-05-18T00:00:00Z	True