Audit of 22,013 x402 endpoints: catalogue is ~90% accurate but rarely describes output

Researchers fetched all 22,013 rows of the facilitator.payai.network x402 catalogue and 28,423 rows of Coinbase's CDP catalogue. Of 100 live endpoints, 93 returned 402 and 89.2% matched their stored description, but 23.4% of rows publish no output description and the two catalogues overlap on only 14.7%.

• 23.4% of catalogue rows publish no output description; 73.7% carry a JSON Schema
• 93 of 100 live endpoints returned 402, with 89.2% matching stored descriptions
• Facilitator and Coinbase CDP catalogues share just 4,190 resources, 14.7%
• All 120 sampled 402 responses sent PAYMENT-REQUIRED in the header; 33% omitted accepts in the body