attester.dev publishes 7 machine-payable endpoints over the x402 protocol, priced from $0.002 to $0.15 per call. Each was probed directly; the response code below is what it returned.
| Endpoint | Method | Price | Probe |
|---|---|---|---|
| /judge | GET | $0.1 | 402 |
| /spend-check | GET | $0.005 | 402 |
| /v1/package/exists | GET | $0.002 | 402 |
| /v1/symbol/exists | GET | $0.005 | 200 |
| /v1/symbol/signature | GET | $0.01 | 200 |
| /v2/mcp/report | GET | $0.05 | 402 |
| /verify | GET | $0.15 | 200 |
QA Judge: grade an agent output against your rubric (structure, citations, claim support, length constraints) and receive a 0-100 score with a signed attestation. $0.10 USDC per grading.
Spend Check: should you pay this counterparty? Watchtower track record, CDP merchant catalog, and address hygiene combined into a clear/caution/avoid verdict with a signed attestation. $0.005 USDC per…
Deterministic package existence for PyPI and npm, built from real published artifacts (never LLM guesses). Negative answers and typosquat-adjacency flags carry signed proof. $0.002 USDC per check.
Deterministic symbol existence for PyPI and npm packages: functions, classes, methods, constants with signatures and deprecation flags, extracted from real artifacts. Negative answers include closest …
Full signature for a symbol in a PyPI or npm package at an exact version: structured params, docstring, deprecation flag with since-version, extracted from the real artifact with signed proof. $0.01 U…
Signed drift history for one MCP server: pins over time, every detected drift event, and a current verdict (stable, changed, or poisoning-suspect). $0.05 USDC per report.
Verification Oracle: independent checks on another agent's work (citation support, data/schema validation) returning a wallet-signed attestation. $0.15 USDC per verification.