x402 List

x402 Protocol Service Directory

●

Aubrai x402 API

AI

Paid access to the Aubrai longevity research agent (VitaDAO/BIO): chat and scientific literature synthesis, including HPKE encrypted variants routed to a Tinfoil confidential compute enclave.

Pay from $0.02 to $0.03 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.

UPTIME 24H 100% │ 7D 100% │ 30D 100%
BASE URL https://x402-api.aubr.ai │ ENDPOINTS 4 │ NETWORK Base │ ASSET USDC │ MEMBER SINCE 2026-07-20 │ MONITORED SINCE 2026-07-20

ASSESSMENT

updated 44m ago

Evidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.

reliability 100%
uptime 24h
100%
uptime 7d
100%
uptime 30d
100%
uptime 90d
100%
response p95
283ms
avg response
156ms
total checks
71
compliance A (11/11)

11 of 11 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.02 to $0.03 (p67 in AI)
price (min)
$0.02
price (max)
$0.03
category percentile (min)
p67 in AI
category percentile (max)
p38 in AI
endpoints / prices
4 / 2
model
tiered
stability
100%
risk clean

No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.

traction $10.44 30d · 15 buyers
volume 30d
$10.44
buyers 30d
15
settlements 30d
477
last settlement
2026-07-21
top buyer share
44% of 30d volume
trend 7d vs 30d
1.19x the 30d daily rate
networks
eip155:8453

Conservative undercount: only USDC settlements via facilitators we measure are counted. A measured floor, not an estimate.

Top buyer share is a concentration signal, not part of the ranking score.

WHAT IT DOES

ai-derived

Provides AI-powered chat and literature synthesis services for scientific research

category
ai-research
in
body
aichatliteratureresearchscience

AI-generated summary. The measured data is never altered by it.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD PATH DESCRIPTION PRICE NETWORK ASSET
POST /api/chat $0.02 Base USDC
POST /api/chat/encrypted $0.02 Base USDC
POST /api/literature $0.03 Base USDC
POST /api/literature/encrypted $0.03 Base USDC
4 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to POST /api/chat returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request
curl -i -X POST 'https://x402-api.aubr.ai/api/chat'
// 402 response (captured by monitor) · 4 payloads · click to expand 
[
  {
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x44dC2dceaA22c7EF6B2E2cF2362Fd3FB476b7c2C",
        "amount": "20000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 120
      }
    ],
    "resource": {
      "url": "https://x402-api.aubr.ai/api/chat",
      "mimeType": "application/json",
      "description": "Send a question about longevity, aging, or lifespan science. Returns a request ID to poll for the AI-generated answer from Aubrai, VitaDAO's decentralized co-scientist."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "fast": true,
              "message": "What is rapamycin?"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "status": "queued",
              "requestId": "req_abc123"
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "bodyType",
                "body",
                "method"
              ],
              "properties": {
                "body": {
                  "required": [
                    "message"
                  ],
                  "properties": {
                    "fast": {
                      "type": "boolean",
                      "description": "true → quick conversational answer (3-6s). false/omit → deep research with citations (15-25s)."
                    },
                    "message": {
                      "type": "string",
                      "description": "Chat message"
                    }
                  }
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x44dC2dceaA22c7EF6B2E2cF2362Fd3FB476b7c2C",
        "amount": "20000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 600
      }
    ],
    "resource": {
      "url": "https://x402-api.aubr.ai/api/chat/encrypted",
      "mimeType": "application/json",
      "description": "Send an HPKE-encrypted prompt to the Aubrai chat agent running inside an attested private enclave. Only the enclave can decrypt your message."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "hpke_ciphertext": "<base64-encrypted-prompt>",
              "hpke_ephemeral_public_key": "<base64-ephemeral-pubkey>"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "status": "queued",
              "pollUrl": "https://x402-api.aubr.ai/api/chat/encrypted/status/req_abc123",
              "requestId": "req_abc123"
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "bodyType",
                "body",
                "method"
              ],
              "properties": {
                "body": {
                  "required": [
                    "hpke_ciphertext",
                    "hpke_ephemeral_public_key"
                  ],
                  "properties": {
                    "hpke_ciphertext": {
                      "type": "string",
                      "description": "HPKE-encrypted prompt, base64-encoded"
                    },
                    "hpke_ephemeral_public_key": {
                      "type": "string",
                      "description": "Sender's one-time X25519 public key, base64-encoded"
                    }
                  }
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x44dC2dceaA22c7EF6B2E2cF2362Fd3FB476b7c2C",
        "amount": "30000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 1800
      }
    ],
    "resource": {
      "url": "https://x402-api.aubr.ai/api/literature",
      "mimeType": "application/json",
      "description": "Search and synthesize scientific literature on longevity and aging. Submit a research question; returns cited answer with references from PubMed and other sources."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "mode": "deep",
              "tags": [
                "NAD+",
                "autophagy"
              ],
              "sources": [
                "pubmed"
              ],
              "tagMode": "fanout",
              "question": "Research radar for longevity tracked terms",
              "sourceProfile": "clinical",
              "includeRejected": false,
              "filterReferences": true,
              "retrievalProfile": "litqa-recall"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "jobId": "lit_abc123",
              "status": "queued",
              "quality": {
                "filtered": true,
                "rawCount": 12,
                "evidenceThin": false,
                "acceptedCount": 5,
                "lowConfidence": false,
                "rejectedCount": 7,
                "rejectionReasons": {
                  "low_relevance": 3,
                  "low_query_overlap": 4
                }
              }
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "bodyType",
                "body",
                "method"
              ],
              "properties": {
                "body": {
                  "required": [
                    "question"
                  ],
                  "properties": {
                    "mode": {
                      "enum": [
                        "fast",
                        "deep"
                      ],
                      "type": "string",
                      "description": "Search depth"
                    },
                    "tags": {
                      "type": "array",
                      "items": {
                        "type": "string"
                      },
                      "description": "Tracked terms for radar-style searches. With tagMode=fanout, each tag is searched separately."
                    },
                    "year": {
                      "type": "string",
                      "description": "Filter by publication year"
                    },
                    "scope": {
                      "enum": [
                        "preprints",
                        "no-preprints",
                        "trials"
                      ],
                      "type": "string",
                      "description": "Opt-in scoping mapped to Exa domains: preprints (biorxiv/medrxiv/arxiv), no-preprints (exclude those), trials (clinicaltrials.gov). Omit for full index."
                    },
                    "date_to": {
                      "type": "string",
                      "description": "End date filter (YYYY-MM-DD)"
                    },
                    "sources": {
                      "type": "array",
                      "items": {
                        "type": "string"
                      },
                      "description": "Deprecated / ignored — retrieval is one Exa index (already covers pubmed/arxiv/biorxiv/etc.). Use scope instead."
                    },
                    "tagMode": {
                      "enum": [
                        "fanout",
                        "combined"
                      ],
                      "type": "string",
                      "description": "Use fanout for independent tracked-term searches; use combined only when tags must be searched together."
                    },
                    "question": {
                      "type": "string",
                      "description": "Research question"
                    },
                    "date_from": {
                      "type": "string",
                      "description": "Start date filter (YYYY-MM-DD)"
                    },
                    "maxResults": {
                      "type": "number",
                      "description": "Max results to return"
                    },
                    "privacyMode": {
                      "type": "string",
                      "description": "Optional plaintext privacy mode forwarded to Aubrai when provided."
                    },
                    "sourceProfile": {
                      "enum": [
                        "fast-default",
                        "deep-default",
                        "clinical",
                        "paperclip",
                        "litqa-recall"
                      ],
                      "type": "string",
                      "description": "Optional source profile. Omit for Aubrai defaults."
                    },
                    "perSourceLimit": {
                      "type": "number",
                      "description": "Deprecated / ignored — Exa is a single index (no per-source cap)."
                    },
                    "includeRejected": {
                      "type": "boolean",
                      "description": "Default false — when true, completed responses include rejectedReferences[] and relevance.reason on rejected refs."
                    },
                    "filterReferences": {
                      "type": "boolean",
                      "description": "Default true upstream — drop off-topic refs. Set false for raw/unfiltered refs (debug)."
                    },
                    "retrievalProfile": {
                      "enum": [
                        "default",
                        "litqa-recall"
                      ],
                      "type": "string",
                      "description": "Optional retrieval profile: \"default\" or \"litqa-recall\"."
                    },
                    "allowSourceExpansion": {
                      "type": "boolean",
                      "description": "Deprecated / ignored — Exa is a single index. Use scope for deliberate scoping."
                    }
                  }
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  },
  {
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x44dC2dceaA22c7EF6B2E2cF2362Fd3FB476b7c2C",
        "amount": "30000",
        "scheme": "exact",
        "network": "eip155:8453",
        "maxTimeoutSeconds": 1800
      }
    ],
    "resource": {
      "url": "https://x402-api.aubr.ai/api/literature/encrypted",
      "mimeType": "application/json",
      "description": "Send an HPKE-sealed literature query to Aubrai and receive an encrypted result. The transport terminates at Aubrai; literature retrieval and evidence processing use external services. Always async — poll the returned pollUrl."
    },
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "hpke_ciphertext": "<base64-encrypted-query>",
              "hpke_ephemeral_public_key": "<base64-ephemeral-pubkey>"
            },
            "type": "http",
            "method": "POST",
            "bodyType": "json"
          },
          "output": {
            "type": "json",
            "example": {
              "status": "pending",
              "pollUrl": "https://x402-api.aubr.ai/api/literature/encrypted/status/req_abc123",
              "requestId": "req_abc123"
            }
          }
        },
        "schema": {
          "type": "object",
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "required": [
            "input"
          ],
          "properties": {
            "input": {
              "type": "object",
              "required": [
                "type",
                "bodyType",
                "body",
                "method"
              ],
              "properties": {
                "body": {
                  "required": [
                    "hpke_ciphertext",
                    "hpke_ephemeral_public_key"
                  ],
                  "properties": {
                    "hpke_ciphertext": {
                      "type": "string",
                      "description": "HPKE-encrypted literature query, base64-encoded"
                    },
                    "hpke_ephemeral_public_key": {
                      "type": "string",
                      "description": "Sender's one-time X25519 public key, base64-encoded"
                    }
                  }
                },
                "type": {
                  "type": "string",
                  "const": "http"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                }
              },
              "additionalProperties": false
            },
            "output": {
              "type": "object",
              "required": [
                "type"
              ],
              "properties": {
                "type": {
                  "type": "string"
                },
                "example": {
                  "type": "object"
                }
              }
            }
          }
        }
      }
    },
    "x402Version": 2
  }
]

UPTIME

07-20 · uptime 100.0% · 154ms avg07-21 · uptime 100.0% · 159ms avg07-2007-21
RESPONSE TIME
07-20 · 154ms avg07-20 · 154ms avg07-21 · 159ms avg07-21 · 159ms avg07-2007-21
30d UPTIME 100%
UPTIME 30D 100%
AVG RESP 160ms
TOTAL CHECKS 73

RECENT CHECKS

TIME STATUS RESP
● SLOW 358ms
● SLOW 256ms
● OK 178ms
● OK 210ms
● OK 147ms
● OK 232ms
● OK 160ms
● OK 143ms
● SLOW 242ms
● OK 238ms
● OK 108ms
● OK 225ms
● OK 100ms
● OK 126ms
● OK 137ms
● OK 103ms
● OK 140ms
● OK 192ms
18 of 73 checks

OVER TIME

All charts share the 30d window selected here. Every series is also served as JSON at /api/v1/services/aubrai-x402-api/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted).

PRICE (captured 402, USD)
07-20 · $0.0307-21 · $0.03$0.0307-2007-21

Median across 4 endpoints. Use the selector to isolate one.

SUB-SCORES (uptime + x402 compliance)
07-20 uptime: 100.0% compliance: 100% checks07-21 uptime: 100.0% compliance: 100% checksuptimecompliance07-2007-21
VOLUME (on-chain settlement, USD)
06-21 · $0.0206-22 · $0.1706-23 · $0.1806-24 · $0.4606-25 · $0.7106-26 · $0.0406-29 · $0.1106-30 · $0.2207-01 · $0.0507-02 · $0.2607-03 · $0.4707-06 · $0.0607-07 · $0.7207-08 · $207-09 · $0.1107-10 · $107-11 · $0.0807-12 · $0.0507-13 · $0.4007-14 · $0.8107-15 · $0.3007-16 · $0.7607-17 · $0.4807-20 · $0.4907-21 · $0.13peak $206-2107-21
DISTINCT BUYERS
06-21 · 1 buyer06-22 · 2 buyers06-23 · 2 buyers06-24 · 1 buyer06-25 · 1 buyer06-26 · 1 buyer06-29 · 3 buyers06-30 · 4 buyers07-01 · 2 buyers07-02 · 1 buyer07-03 · 2 buyers07-06 · 1 buyer07-07 · 3 buyers07-08 · 2 buyers07-09 · 2 buyers07-10 · 3 buyers07-11 · 3 buyers07-12 · 2 buyers07-13 · 2 buyers07-14 · 2 buyers07-15 · 3 buyers07-16 · 2 buyers07-17 · 2 buyers07-20 · 1 buyer07-21 · 1 buyerpeak 4 buyers06-2107-21

COMPLIANCE

11/11 checks pass · grade A
  • 402 payload captured
  • accepts[] array present
  • payTo address recoverable
  • payTo at accepts[0].payTo (conformant shape)
  • payTo is a valid on-chain address
  • atomic price declared
  • atomic price in a sane range
  • asset (token) address declared
  • network resolves to CAIP-2
  • payment scheme declared
  • served over HTTPS

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Show that Aubrai x402 API is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

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RUN THIS SERVICE?

Keep this listing accurate: propose changes to the name, description, website, category or add new endpoints to monitor. Ownership is verified with a domain proof and every change is reviewed manually; measured data stays read-only.

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