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Proofivy Library (CryptoSlate + The Phoblographer)

payment-readyonline

payment-ready until 2026-11-06

x402 micropayment APIs for publisher content.

proofivy.com ↗

Call it x402 v2

x402 v2

Base URL
https://library.proofivy.com
Payment
x402 v2, header channel
$ curl -i 'https://library.proofivy.com/cryptoslate_list'

An unpaid request returns HTTP 402 with the payment terms. Sign a payment authorization, then retry with the PAYMENT-SIGNATURE header.

Endpoints 4 paid routes on library.proofivy.com

POST/cryptoslateBase$0.01since 09-14
GET/cryptoslate_listBase$0.01since 09-14
POST/the_phoblographerBase$0.07since 09-14
GET/the_phoblographer_listBase$0.01since 09-14

Prices as captured in the 402 response: median $0.01 across the 4 endpoints.

Example 402 response

Endpoints and prices

Current paid endpoints; minimum quoted prices in USD where available; first capture dates in UTC
MethodPathDescriptionPriceNetworkAsset402 channelCaptured
POST/cryptoslateCryptoslate content lookup. Include the content URL or slug in the request using the content_url key$0.01BaseUSDCheadersince 09-14
GET/cryptoslate_listGet list of all available CryptoSlate content URLs with their last updated dates$0.01BaseUSDCheadersince 09-14
POST/the_phoblographerThe Phoblographer content lookup. Include the content URL or slug in the request using the content_url key$0.07BaseUSDCheadersince 09-14
GET/the_phoblographer_listGet list of all available The Phoblographer content URLs with their last updated dates$0.01BaseUSDCheadersince 09-14

Payment evidence

402 payload captured at . Check evidence JSON · Measurement methodology.

First of 4 payloads captured by the monitor.

128 lines, scroll inside

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x859af250DF0b68bfD0768cA22142a1AFa0aBEAF4",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://library.proofivy.com/cryptoslate",
    "mimeType": "application/json",
    "description": "Cryptoslate content lookup. Include the content URL or slug in the request using the content_url key"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "content_url": "https://cryptoslate.com/bitcoin-investment-thesis-institutional-demand-macro-flow-guide/"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "text": "The CryptoSlate article content...",
            "status": "success",
            "proofivy_cid": "bafkreiexample..."
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "content_url"
                ],
                "properties": {
                  "content_url": {
                    "type": "string",
                    "description": "The URL or slug of the CryptoSlate article to retrieve"
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "required": [
                  "status",
                  "proofivy_cid",
                  "text"
                ],
                "properties": {
                  "text": {
                    "type": "string"
                  },
                  "status": {
                    "type": "string"
                  },
                  "proofivy_cid": {
                    "type": "string"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}
Other captured 402 responses (3)

Captured payload 2 of 4

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x859af250DF0b68bfD0768cA22142a1AFa0aBEAF4",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://library.proofivy.com/cryptoslate_list",
    "mimeType": "application/json",
    "description": "Get list of all available CryptoSlate content URLs with their last updated dates"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET"
        },
        "output": {
          "type": "json",
          "example": {
            "status": "success",
            "content_urls": [
              {
                "date": "2026-01-15",
                "slug": "bitcoin-article"
              },
              {
                "date": "2026-01-20",
                "slug": "ethereum-guide"
              }
            ]
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {}
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "required": [
                  "status",
                  "content_urls"
                ],
                "properties": {
                  "status": {
                    "type": "string"
                  },
                  "content_urls": {
                    "type": "array",
                    "items": {
                      "type": "object",
                      "required": [
                        "slug",
                        "date"
                      ],
                      "properties": {
                        "date": {
                          "type": "string"
                        },
                        "slug": {
                          "type": "string"
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 3 of 4

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xA0bDC6cD7EC19c9D4F0C72fB2D79fB65D118D3Ab",
      "amount": "70000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://library.proofivy.com/the_phoblographer",
    "mimeType": "application/json",
    "description": "The Phoblographer content lookup. Include the content URL or slug in the request using the content_url key"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "body": {
            "content_url": "https://www.thephoblographer.com/2026/09/06/gobirding-vision-master-scope-review-it-takes-the-guesswork-out-of-bird-photography/"
          },
          "type": "http",
          "method": "POST",
          "bodyType": "json"
        },
        "output": {
          "type": "json",
          "example": {
            "text": "The Phoblographer article content...",
            "status": "success",
            "proofivy_cid": "bafkreiexample..."
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method",
              "bodyType",
              "body"
            ],
            "properties": {
              "body": {
                "type": "object",
                "required": [
                  "content_url"
                ],
                "properties": {
                  "content_url": {
                    "type": "string",
                    "description": "The URL or slug of The Phoblographer article to retrieve"
                  }
                }
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "POST",
                  "PUT",
                  "PATCH"
                ],
                "type": "string"
              },
              "bodyType": {
                "enum": [
                  "json",
                  "form-data",
                  "text"
                ],
                "type": "string"
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "required": [
                  "status",
                  "proofivy_cid",
                  "text"
                ],
                "properties": {
                  "text": {
                    "type": "string"
                  },
                  "status": {
                    "type": "string"
                  },
                  "proofivy_cid": {
                    "type": "string"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Captured payload 4 of 4

{
  "error": "Payment required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xA0bDC6cD7EC19c9D4F0C72fB2D79fB65D118D3Ab",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://library.proofivy.com/the_phoblographer_list",
    "mimeType": "application/json",
    "description": "Get list of all available The Phoblographer content URLs with their last updated dates"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET"
        },
        "output": {
          "type": "json",
          "example": {
            "status": "success",
            "content_urls": [
              {
                "date": "2026-09-06",
                "slug": "gobirding-vision-master-scope-review-it-takes-the-guesswork-out-of-bird-photography"
              },
              {
                "date": "2026-09-01",
                "slug": "camera-lens-guide"
              }
            ]
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {}
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object",
                "required": [
                  "status",
                  "content_urls"
                ],
                "properties": {
                  "status": {
                    "type": "string"
                  },
                  "content_urls": {
                    "type": "array",
                    "items": {
                      "type": "object",
                      "required": [
                        "slug",
                        "date"
                      ],
                      "properties": {
                        "date": {
                          "type": "string"
                        },
                        "slug": {
                          "type": "string"
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "x402Version": 2
}

Can I trust it score from our own monitoring

score from our own monitoring

87/100 Solid

#13 of 63 in Content. Bands: strong 93+, solid 75+, mixed 55+, weak below 55.

Reliability
99.9% uptime 30d
Compliance
A 14/14 checks pass
Price
$0.01 to $0.07 p39 in Content
Risk
clean no risk flag
Traction
$0.53 30d 11 buyers, top buyer 50% (address, not entity)
14/14 compliance checks
  • 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
  • declares the current x402 version (2)
  • EIP-712 domain parameters present on every EVM entry
  • x402 v2 envelope delivered in the payment-required header

402 terms unchanged since 2026-09-14. Last up 2026-10-30.

── Site signals

  • homepage reachable
  • openapi doc
  • pricing page
  • llms.txt
  • robots.txt
  • terms page
How the score works

What the score read on this service: status online, 99.9% uptime 30d, 408ms response p95, x402 compliance 14 of 14, $0.01 price against the category, on-chain traction measured. Each of those is measured, and each is published in full below.

The score comes from our own monitoring, never from reviews, operator claims, or a language model: reliability, x402 compliance, price against the category, a deterministic risk flag, and a small on-chain traction term, weighted by ranking generation 3. It is not placement anyone can buy: the paid verify tier is reported beside it and is not one of its inputs. Every component below stays published and read-only.

Bands on the 0 to 100 measured score: strong at 93 and above, solid from 75, mixed from 55, weak below 55. Price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, so the score places a service in its own field.

It is a score inside Content, and only there: price and speed are scored against the whole category field, every listing in it that carries no danger flag, the scored service included, which here means 63 listings, this one among them: the same 63 the position above is counted against. When the two differ, the field is the wider one, because a listing we have measured too little of to rank still sits in the field the price and the speed are normalized over. The same service in a different field would read differently. The same engine answers GET /api/v1/best, and asked for a different pool (the whole directory, or another filter) it returns a different number for this service under this same ranking generation. Neither is more correct: they answer different questions, and the methodology states which is which.

Settled via coinbase ($0.53, 35 tx). Traction is a conservative undercount; first settlement seen 2026-01-30.

All measured facts

What it does

x402 micropayment APIs for publisher content. Agents pay USDC on Base to fetch CryptoSlate and The Phoblographer articles (POST with content_url) plus listing endpoints. Humans stay free on the publisher sites.

Proofivy Library (CryptoSlate + The Phoblographer) is a listed x402 Content API. Captured payment terms name Base. Monitoring and settlement figures below describe the observations available to this directory; an unpaid HTTP 402 check does not prove that a paid call will deliver.

Assessment computed at . Latest service check observed at . Service data JSON · Measurement methodology.

Page rendered at . This response time is separate from the observation and computation times attached to each measurement.

Latest endpoint observation: . Latest price capture: . Prices are recorded quotes, not a promise of availability. Token assets and payment terms are listed separately. Endpoint data JSON · Price history JSON · Measurement methodology.

Assessment computed at . Uptime uses the stated daily-rollup window; response times are in milliseconds, compliance is passed/evaluated checks, and traction is a measured settlement floor. The comparison score is out of 100 within this category. Assessment JSON · Measurement methodology.

Observed daily coverage: 2026-10-01 to 2026-10-30 UTC. Daily monitoring and settlement rollups do not expose their computation time; a bucket date is not an update timestamp. Latest settlement in the assessment: . Uptime and response JSON · Volume JSON · Buyers JSON · Measurement methodology.

Ranked from the measured category pool, refreshed at most once a minute. The comparison has no persisted computation timestamp; the assessment time above belongs to this service only. Ranking API documentation · Ranking methodology.

x402 List home · Services · Content

uptime · latest daily rollup
100%
uptime 7d
100%
uptime 30d
99.9%
uptime 90d
100%
response p95
408ms
avg response
251ms
total checks
3,008

Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.

price (min)
$0.01
price (max)
$0.07
category percentile (min)
p39 in Content
category percentile (max)
p48 in Content
endpoints / prices
4 / 2
model
tiered
stability
100%

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.

domain age
1888d
registrar
Amazon Registrar, Inc.
hosting
custom
domain created
2021-08-26

Identity facts, not a risk score.

assessment volume 30d
$0.53
exact assessment volume 30d (USD)
0.53
assessment recorded at (UTC)
2026-10-29T23:03:50.929Z
buyers 30d
11
settlements 30d
35
measured since
2026-01-30 (start of our harvest window)
last settlement
2026-10-27
top buyer share
50% of 30d volume (address, not entity)
top 3 buyers share
75% of 30d volume (addresses, not entities)
concentrated volume
no
trend 7d vs 30d
2.18x the 30d daily rate
networks
eip155:8453
volume all-time
$4.41
settlements all-time
181
median settlement 30d
$0.01
max settlement 30d
$0.07

Assessment volume uses the latest 30d assessment. Over time sums daily address snapshots, rounded to cents and refreshed separately. The two sources can differ in timing, precision and shared-address attribution. Amounts use cents for comparison; known sub-cent values keep up to 12 significant digits. The exact stored assessment value is shown above.

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

Top buyer share lowers the on-chain traction part of the ranking score behind this page's verdict and /best, by up to half when one address holds all 30d volume. The Recommended and Highest volume sorts of the services list do not use it; they use the Concentrated volume rule instead.

member since
2026-09-14
Recent checks
Latest 18 unpaid HTTP checks, newest first; response times in milliseconds, observation times in UTC
Checked at (UTC)StatusHTTPResponseEndpoints
Online402573ms4
Online402138ms4
Online402205ms4
Online402161ms4
Online402190ms4
Online402180ms4
Online402107ms4
Online402231ms4
Online402149ms4
Online402137ms4
Online402133ms4
Online402174ms4
Online402250ms4
Online402118ms4
Online402182ms4
Online402142ms4
Online402224ms4
Online4021003ms4

Changes0 in 30d

No changes recorded in the last 30 days.

all changes

Over time

On-chain volume daily snapshots, USD 30d: $0.53, peak $0.13 on 10-27
volume no data in the payload
Distinct buyers per dayDistinct buyers per day
Uptime 1 of 29 completed days below 100%
uptime below 100%, to scale
Volume 30d
$0.53
Uptime
1 of 29 completed days below 100%
Daily on-chain settlement volume in US dollars, 2026-10-01 to 2026-10-30; highest day $0.13 on 10-27; 16 days have no data in the payload; distinct buyers per day
More charts
Response time daily average, ms min 113ms, avg 226ms, max 443ms

10-01 to 10-30* UTC

Scores over time

x402 compliance low 14/14, high 14/14

10-01 to 10-30* UTC

Price percentile in Content own low to high; exact values below

10-01 to 10-30* UTC

Site signals present (of 6) own low to high; exact values below

10-01 to 10-30* UTC

Scores: one day per column, 10-01 to 10-30*, on the columns of Response time. Uptime held below 100% on some days in this window, including any partial day. Daily readings remain in the Uptime strip and Values. The checklist grew from 11 to 14 checks on 2026-07-28, before this window. Pillar lines use their own low and high. Exact dated readings are available in each readout and in Values.

Each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/proofivy-library-cryptoslate-the-phoblographer/price, /scores, /volume and /buyers.

Values

* today so far, partial (UTC).

The uptime summary counts completed UTC days only. The strip, readouts and table retain today's partial reading.

Daily snapshot total, 30d: $0.48, peak $0.13 on 10-27. The visible 30d total in Traction comes from the latest assessment. These sources can differ in their window, refresh time, cent rounding and shared-address attribution.

Daily address snapshots: 2026-10-01 to 2026-10-30 UTC; * today so far, partial (UTC). Daily snapshots store cents. A recorded $0.00 with settlements cannot distinguish exact zero from volume rounded away. Lost precision is unavailable here.

Settlement volume uses the stored USD valuation of tracked payments; it is distinct from token quantities. USD-pegged assets are valued at 1 USD per token in these rollups. The measured settlement floor does not cover all payments to this service.

Assessment history last recorded at . Each UTC day uses its last recorded run; missing readings stay unmeasured. Assessment history JSON · Measurement methodology.

Daily values, 2026-10-01 to 2026-10-30: address settlement volume in USD, distinct buyer and settlement counts, uptime percent, average response milliseconds, compliance passed/total, price percentile 0-100, site signals out of 6; UTC dates
DayVolumeBuyersSettlementsUptimeResponseCompliancePrice percentileSite signals
2026-10-01no datano datano data100%427.33ms14/14p371/6
2026-10-02$0.0111100%302.11ms14/14p371/6
2026-10-03no datano datano data100%330.52ms14/14p371/6
2026-10-04$0.0111100%321.28ms14/14p371/6
2026-10-05no datano datano data100%283.48ms14/14p341/6
2026-10-06no datano datano data100%192.12ms14/14p341/6
2026-10-07$0.0822100%250.84ms14/14p341/6
2026-10-08no datano datano data97.78%267.77ms14/14p341/6
2026-10-09$0.0222100%316.76ms14/14p341/6
2026-10-10no datano datano data100%221.50ms14/14p341/6
2026-10-11no datano datano data100%181.73ms14/14p341/6
2026-10-12$0.0222100%206.88ms14/14p341/6
2026-10-13no datano datano data100%166.11ms14/14p341/6
2026-10-14$0.0333100%161.77ms14/14p371/6
2026-10-15$0.0111100%188.32ms14/14p371/6
2026-10-16no datano datano data100%231.23ms14/14p371/6
2026-10-17no datano datano data100%189.60ms14/14p371/6
2026-10-18no datano datano data100%165.64ms14/14p371/6
2026-10-19$0.0222100%284.74ms14/14p371/6
2026-10-20no datano datano data100%442.55ms14/14p371/6
2026-10-21$0.0111100%203.77ms14/14p371/6
2026-10-22$0.0111100%157.18ms14/14p371/6
2026-10-23$0.1135100%175.03ms14/14p371/6
2026-10-24no datano datano data100%169.28ms14/14p371/6
2026-10-25no datano datano data100%118.33ms14/14p371/6
2026-10-26$0.0111100%113.02ms14/14p371/6
2026-10-27$0.1337100%128.62ms14/14p391/6
2026-10-28$0.0111100%174.84ms14/14p391/6
2026-10-29no datano datano data100%219.64ms14/14p391/6
2026-10-30*no datano datano data100%198.17msno datano datano data

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