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saylorinnovations.com x402 API: grades and paid tests

saylorinnovations.com has 1,677 x402 endpoints in our catalog. Right now: 1,117 proceed, 354 caution, 206 avoid. 1,354 passed a real paid test: we paid the listed price and got what the listing promised. Best grade: B.

1,117Proceed
354Caution
206Avoid
1,354Passed a paid test

Every endpoint on saylorinnovations.com

Best grades first. Open an endpoint for its full history: uptime, price and payout-wallet changes, and paid-test results with signed receipts.

Endpoint	Grade	Verdict	Uptime (7 days)	Response time	Paid test passed
/api/kb/mcp-connection-and-tool-call-failures	F	Avoid	48%	150 ms	Yes
/api/kb/mcp-server-authentication-oauth	F	Avoid	48%	107 ms	Yes
/api/kb/mcp-server-typescript-sdk-zod-input-validation-tool-errors-test	F	Avoid	48%	135 ms	Yes
/api/kb/money-floating-point-rounding-errors	F	Avoid	48%	73 ms	Yes
/api/kb/mongodb-slow-query-explain-indexing	F	Avoid	48%	150 ms	Yes
/api/kb/mypy-common-errors-optional-none-implicit-fixes	F	Avoid	48%	143 ms	Yes
/api/kb/mysql-slow-query-index-diagnosis	F	Avoid	48%	77 ms	Yes
/api/kb/ndjson-jsonl-vs-json-streaming-parsing-python-jq	F	Avoid	48%	111 ms	Yes
/api/kb/nextjs-hydration-mismatch-errors	F	Avoid	48%	65 ms	Yes
/api/kb/nginx-502-504-upstream	F	Avoid	48%	119 ms	Yes
/api/kb/nginx-too-many-redirects-loop	F	Avoid	48%	156 ms	Yes
/api/kb/node-child-process-exec-execfile-spawn-shell-injection-maxbuffer	F	Avoid	48%	145 ms	Yes
/api/kb/node-env-file-process-env-strings-precedence-config-loading	F	Avoid	48%	149 ms	Yes
/api/kb/node-esm-commonjs-require-import-errors	F	Avoid	48%	138 ms	Yes
/api/kb/node-event-loop-blocked	F	Avoid	48%	136 ms	Yes
/api/kb/node-fetch-failed-errors-timeouts-retries	F	Avoid	48%	166 ms	Yes
/api/kb/node-fetch-undici-connection-errors	F	Avoid	48%	142 ms	Yes
/api/kb/node-fs-promises-error-codes-enoent-eexist-enotempty-recursive-atomic-write	F	Avoid	48%	179 ms	Yes
/api/kb/node-streams-readline-pipeline-backpressure-large-files	F	Avoid	48%	134 ms	Yes
/api/kb/node-unhandled-rejection-eaddrinuse-uncaught-exception-crashes	F	Avoid	48%	150 ms	Yes
/api/kb/node-worker-threads-cpu-bound-parallelism-event-loop-blocked-ticks	F	Avoid	48%	168 ms	Yes
/api/kb/nodejs-memory-leak-heap-debugging	F	Avoid	48%	65 ms	Yes
/api/kb/npm-eresolve-peer-dependency-errors-engines-semver-ranges	F	Avoid	48%	153 ms	Yes
/api/kb/numpy-broadcasting-dtype-overflow-views-nan-pitfalls	F	Avoid	48%	149 ms	Yes
/api/kb/oauth-pkce-code-verifier-challenge-s256-python-mcp-clients	F	Avoid	48%	63 ms	Yes
/api/kb/openapi-spec-quality-for-ai-agents	F	Avoid	48%	138 ms	Yes
/api/kb/openssl-cookbook-self-signed-cert-inspect-verify-fingerprint	F	Avoid	48%	153 ms	Yes
/api/kb/pandas-groupby-resample-nan-groups-count-vs-size	F	Avoid	48%	141 ms	Yes
/api/kb/pandas-large-csv-memory-errors	F	Avoid	48%	150 ms	Yes
/api/kb/pandas-merge-join-duplicate-keys-validate-indicator	F	Avoid	48%	66 ms	Yes
/api/kb/pandas-settingwithcopywarning-chained-assignment-copy-on-write	F	Avoid	48%	56 ms	Yes
/api/kb/pgvector-hnsw-index-tuning	F	Avoid	48%	78 ms	Yes
/api/kb/pip-dependency-conflicts-resolver-errors-venv-check	F	Avoid	48%	129 ms	Yes
/api/kb/postgres-connection-pool-exhaustion	F	Avoid	48%	86 ms	Yes
/api/kb/postgres-deadlock-and-lock-wait-diagnosis	F	Avoid	48%	64 ms	Yes
/api/kb/postgres-slow-query-diagnosis	F	Avoid	48%	74 ms	Yes
/api/kb/prisma-migration-drift-errors	F	Avoid	48%	79 ms	Yes
/api/kb/pydantic-model-json-schema-llm-tool-definitions-defs-refs-inline-validation	F	Avoid	48%	63 ms	Yes
/api/kb/pydantic-v2-validation-errors-migration	F	Avoid	48%	71 ms	Yes
/api/kb/pytest-fixtures-scope-conftest-autouse-order-setup-show-typos	F	Avoid	48%	78 ms	Yes
/api/kb/pytest-flaky-tests-isolation	F	Avoid	48%	133 ms	Yes
/api/kb/pytest-mock-patch-where-used-autospec-monkeypatch	F	Avoid	48%	140 ms	Yes
/api/kb/python-argparse-cli-subcommands-errors-exit-codes	F	Avoid	48%	92 ms	Yes
/api/kb/python-asyncio-blocking-and-hangs	F	Avoid	48%	132 ms	Yes
/api/kb/python-asyncio-errors-never-awaited-blocking-loop	F	Avoid	48%	145 ms	Yes
/api/kb/python-closures-late-binding-generators-exhausted-iterators	F	Avoid	48%	78 ms	Yes
/api/kb/python-collections-defaultdict-counter-deque-shallow-copy-dict-gotchas	F	Avoid	48%	139 ms	Yes
/api/kb/python-context-managers-with-statement-contextlib-exit-suppress	F	Avoid	48%	127 ms	Yes
/api/kb/python-dataclass-mutable-default-copy-bugs	F	Avoid	48%	148 ms	Yes
/api/kb/python-datetime-timezone-pitfalls-naive-aware-dst	F	Avoid	48%	82 ms	Yes

About saylorinnovations.com

Is saylorinnovations.com safe to pay?

1,117 of saylorinnovations.com's endpoints are rated Proceed: reliable in monitoring with a stable price and payout wallet, and the best ones delivered in a real paid test. 206 are rated Avoid, so check the exact endpoint before paying. Grades are per endpoint, so look up the one your agent is about to pay.

How are these grades made?

Lumière PayCheck checks every endpoint about every 30 minutes: does it answer with a valid x402 quote, is the price and payout wallet stable. Then we pay some of them for real and check the response against what the listing promised. Failures are re-tested before they count. How it works.

Can my agent check saylorinnovations.com before paying?

Yes, for free. Call check_payment (API or MCP) with the endpoint, amount and payTo from the 402 quote, and pay only if it returns allow. Check an endpoint now.

Do you run saylorinnovations.com? Prove your endpoints work: get tested, check your setup, or add endpoints we're missing. Every seller's results are public, here and in the full catalog.